/* Fold a constant sub-tree into a single node for C-compiler
- Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2002,
- 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GCC.
#include "ggc.h"
#include "hashtab.h"
#include "langhooks.h"
-
-static void encode PARAMS ((HOST_WIDE_INT *,
- unsigned HOST_WIDE_INT,
- HOST_WIDE_INT));
-static void decode PARAMS ((HOST_WIDE_INT *,
- unsigned HOST_WIDE_INT *,
- HOST_WIDE_INT *));
-static tree negate_expr PARAMS ((tree));
-static tree split_tree PARAMS ((tree, enum tree_code, tree *, tree *,
- tree *, int));
-static tree associate_trees PARAMS ((tree, tree, enum tree_code, tree));
-static tree int_const_binop PARAMS ((enum tree_code, tree, tree, int));
-static tree const_binop PARAMS ((enum tree_code, tree, tree, int));
-static hashval_t size_htab_hash PARAMS ((const void *));
-static int size_htab_eq PARAMS ((const void *, const void *));
-static tree fold_convert PARAMS ((tree, tree));
-static enum tree_code invert_tree_comparison PARAMS ((enum tree_code));
-static enum tree_code swap_tree_comparison PARAMS ((enum tree_code));
-static int comparison_to_compcode PARAMS ((enum tree_code));
-static enum tree_code compcode_to_comparison PARAMS ((int));
-static int truth_value_p PARAMS ((enum tree_code));
-static int operand_equal_for_comparison_p PARAMS ((tree, tree, tree));
-static int twoval_comparison_p PARAMS ((tree, tree *, tree *, int *));
-static tree eval_subst PARAMS ((tree, tree, tree, tree, tree));
-static tree omit_one_operand PARAMS ((tree, tree, tree));
-static tree pedantic_omit_one_operand PARAMS ((tree, tree, tree));
-static tree distribute_bit_expr PARAMS ((enum tree_code, tree, tree, tree));
-static tree make_bit_field_ref PARAMS ((tree, tree, int, int, int));
-static tree optimize_bit_field_compare PARAMS ((enum tree_code, tree,
- tree, tree));
-static tree decode_field_reference PARAMS ((tree, HOST_WIDE_INT *,
- HOST_WIDE_INT *,
- enum machine_mode *, int *,
- int *, tree *, tree *));
-static int all_ones_mask_p PARAMS ((tree, int));
-static tree sign_bit_p PARAMS ((tree, tree));
-static int simple_operand_p PARAMS ((tree));
-static tree range_binop PARAMS ((enum tree_code, tree, tree, int,
- tree, int));
-static tree make_range PARAMS ((tree, int *, tree *, tree *));
-static tree build_range_check PARAMS ((tree, tree, int, tree, tree));
-static int merge_ranges PARAMS ((int *, tree *, tree *, int, tree, tree,
- int, tree, tree));
-static tree fold_range_test PARAMS ((tree));
-static tree unextend PARAMS ((tree, int, int, tree));
-static tree fold_truthop PARAMS ((enum tree_code, tree, tree, tree));
-static tree optimize_minmax_comparison PARAMS ((tree));
-static tree extract_muldiv PARAMS ((tree, tree, enum tree_code, tree));
-static tree strip_compound_expr PARAMS ((tree, tree));
-static int multiple_of_p PARAMS ((tree, tree, tree));
-static tree constant_boolean_node PARAMS ((int, tree));
-static int count_cond PARAMS ((tree, int));
-static tree fold_binary_op_with_conditional_arg
- PARAMS ((enum tree_code, tree, tree, tree, int));
-static bool fold_real_zero_addition_p PARAMS ((tree, tree, int));
+#include "md5.h"
+
+static void encode (HOST_WIDE_INT *, unsigned HOST_WIDE_INT, HOST_WIDE_INT);
+static void decode (HOST_WIDE_INT *, unsigned HOST_WIDE_INT *, HOST_WIDE_INT *);
+static bool negate_expr_p (tree);
+static tree negate_expr (tree);
+static tree split_tree (tree, enum tree_code, tree *, tree *, tree *, int);
+static tree associate_trees (tree, tree, enum tree_code, tree);
+static tree int_const_binop (enum tree_code, tree, tree, int);
+static tree const_binop (enum tree_code, tree, tree, int);
+static hashval_t size_htab_hash (const void *);
+static int size_htab_eq (const void *, const void *);
+static tree fold_convert (tree, tree);
+static enum tree_code invert_tree_comparison (enum tree_code);
+static enum tree_code swap_tree_comparison (enum tree_code);
+static int comparison_to_compcode (enum tree_code);
+static enum tree_code compcode_to_comparison (int);
+static int truth_value_p (enum tree_code);
+static int operand_equal_for_comparison_p (tree, tree, tree);
+static int twoval_comparison_p (tree, tree *, tree *, int *);
+static tree eval_subst (tree, tree, tree, tree, tree);
+static tree pedantic_omit_one_operand (tree, tree, tree);
+static tree distribute_bit_expr (enum tree_code, tree, tree, tree);
+static tree make_bit_field_ref (tree, tree, int, int, int);
+static tree optimize_bit_field_compare (enum tree_code, tree, tree, tree);
+static tree decode_field_reference (tree, HOST_WIDE_INT *, HOST_WIDE_INT *,
+ enum machine_mode *, int *, int *,
+ tree *, tree *);
+static int all_ones_mask_p (tree, int);
+static tree sign_bit_p (tree, tree);
+static int simple_operand_p (tree);
+static tree range_binop (enum tree_code, tree, tree, int, tree, int);
+static tree make_range (tree, int *, tree *, tree *);
+static tree build_range_check (tree, tree, int, tree, tree);
+static int merge_ranges (int *, tree *, tree *, int, tree, tree, int, tree,
+ tree);
+static tree fold_range_test (tree);
+static tree unextend (tree, int, int, tree);
+static tree fold_truthop (enum tree_code, tree, tree, tree);
+static tree optimize_minmax_comparison (tree);
+static tree extract_muldiv (tree, tree, enum tree_code, tree);
+static tree extract_muldiv_1 (tree, tree, enum tree_code, tree);
+static tree strip_compound_expr (tree, tree);
+static int multiple_of_p (tree, tree, tree);
+static tree constant_boolean_node (int, tree);
+static int count_cond (tree, int);
+static tree fold_binary_op_with_conditional_arg (enum tree_code, tree, tree,
+ tree, int);
+static bool fold_real_zero_addition_p (tree, tree, int);
+static tree fold_mathfn_compare (enum built_in_function, enum tree_code,
+ tree, tree, tree);
+static tree fold_inf_compare (enum tree_code, tree, tree, tree);
+static bool tree_swap_operands_p (tree, tree);
/* The following constants represent a bit based encoding of GCC's
comparison operators. This encoding simplifies transformations
WORDS points to the array of HOST_WIDE_INTs. */
static void
-encode (words, low, hi)
- HOST_WIDE_INT *words;
- unsigned HOST_WIDE_INT low;
- HOST_WIDE_INT hi;
+encode (HOST_WIDE_INT *words, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
{
words[0] = LOWPART (low);
words[1] = HIGHPART (low);
The integer is stored into *LOW and *HI as two `HOST_WIDE_INT' pieces. */
static void
-decode (words, low, hi)
- HOST_WIDE_INT *words;
- unsigned HOST_WIDE_INT *low;
- HOST_WIDE_INT *hi;
+decode (HOST_WIDE_INT *words, unsigned HOST_WIDE_INT *low,
+ HOST_WIDE_INT *hi)
{
*low = words[0] + words[1] * BASE;
*hi = words[2] + words[3] * BASE;
propagate it. */
int
-force_fit_type (t, overflow)
- tree t;
- int overflow;
+force_fit_type (tree t, int overflow)
{
unsigned HOST_WIDE_INT low;
HOST_WIDE_INT high;
low = TREE_INT_CST_LOW (t);
high = TREE_INT_CST_HIGH (t);
- if (POINTER_TYPE_P (TREE_TYPE (t)))
+ if (POINTER_TYPE_P (TREE_TYPE (t))
+ || TREE_CODE (TREE_TYPE (t)) == OFFSET_TYPE)
prec = POINTER_SIZE;
else
prec = TYPE_PRECISION (TREE_TYPE (t));
The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */
int
-add_double (l1, h1, l2, h2, lv, hv)
- unsigned HOST_WIDE_INT l1, l2;
- HOST_WIDE_INT h1, h2;
- unsigned HOST_WIDE_INT *lv;
- HOST_WIDE_INT *hv;
+add_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT l2, HOST_WIDE_INT h2,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv)
{
unsigned HOST_WIDE_INT l;
HOST_WIDE_INT h;
The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */
int
-neg_double (l1, h1, lv, hv)
- unsigned HOST_WIDE_INT l1;
- HOST_WIDE_INT h1;
- unsigned HOST_WIDE_INT *lv;
- HOST_WIDE_INT *hv;
+neg_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv)
{
if (l1 == 0)
{
The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */
int
-mul_double (l1, h1, l2, h2, lv, hv)
- unsigned HOST_WIDE_INT l1, l2;
- HOST_WIDE_INT h1, h2;
- unsigned HOST_WIDE_INT *lv;
- HOST_WIDE_INT *hv;
+mul_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT l2, HOST_WIDE_INT h2,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv)
{
HOST_WIDE_INT arg1[4];
HOST_WIDE_INT arg2[4];
encode (arg1, l1, h1);
encode (arg2, l2, h2);
- memset ((char *) prod, 0, sizeof prod);
+ memset (prod, 0, sizeof prod);
for (i = 0; i < 4; i++)
{
Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */
void
-lshift_double (l1, h1, count, prec, lv, hv, arith)
- unsigned HOST_WIDE_INT l1;
- HOST_WIDE_INT h1, count;
- unsigned int prec;
- unsigned HOST_WIDE_INT *lv;
- HOST_WIDE_INT *hv;
- int arith;
+lshift_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ HOST_WIDE_INT count, unsigned int prec,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv, int arith)
{
unsigned HOST_WIDE_INT signmask;
Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */
void
-rshift_double (l1, h1, count, prec, lv, hv, arith)
- unsigned HOST_WIDE_INT l1;
- HOST_WIDE_INT h1, count;
- unsigned int prec;
- unsigned HOST_WIDE_INT *lv;
- HOST_WIDE_INT *hv;
- int arith;
+rshift_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ HOST_WIDE_INT count, unsigned int prec,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv,
+ int arith)
{
unsigned HOST_WIDE_INT signmask;
Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */
void
-lrotate_double (l1, h1, count, prec, lv, hv)
- unsigned HOST_WIDE_INT l1;
- HOST_WIDE_INT h1, count;
- unsigned int prec;
- unsigned HOST_WIDE_INT *lv;
- HOST_WIDE_INT *hv;
+lrotate_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ HOST_WIDE_INT count, unsigned int prec,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv)
{
unsigned HOST_WIDE_INT s1l, s2l;
HOST_WIDE_INT s1h, s2h;
Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */
void
-rrotate_double (l1, h1, count, prec, lv, hv)
- unsigned HOST_WIDE_INT l1;
- HOST_WIDE_INT h1, count;
- unsigned int prec;
- unsigned HOST_WIDE_INT *lv;
- HOST_WIDE_INT *hv;
+rrotate_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ HOST_WIDE_INT count, unsigned int prec,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv)
{
unsigned HOST_WIDE_INT s1l, s2l;
HOST_WIDE_INT s1h, s2h;
UNS nonzero says do unsigned division. */
int
-div_and_round_double (code, uns,
- lnum_orig, hnum_orig, lden_orig, hden_orig,
- lquo, hquo, lrem, hrem)
- enum tree_code code;
- int uns;
- unsigned HOST_WIDE_INT lnum_orig; /* num == numerator == dividend */
- HOST_WIDE_INT hnum_orig;
- unsigned HOST_WIDE_INT lden_orig; /* den == denominator == divisor */
- HOST_WIDE_INT hden_orig;
- unsigned HOST_WIDE_INT *lquo, *lrem;
- HOST_WIDE_INT *hquo, *hrem;
+div_and_round_double (enum tree_code code, int uns,
+ unsigned HOST_WIDE_INT lnum_orig, /* num == numerator == dividend */
+ HOST_WIDE_INT hnum_orig,
+ unsigned HOST_WIDE_INT lden_orig, /* den == denominator == divisor */
+ HOST_WIDE_INT hden_orig,
+ unsigned HOST_WIDE_INT *lquo,
+ HOST_WIDE_INT *hquo, unsigned HOST_WIDE_INT *lrem,
+ HOST_WIDE_INT *hrem)
{
int quo_neg = 0;
HOST_WIDE_INT num[4 + 1]; /* extra element for scaling. */
if (hden == 0 && lden == 0)
overflow = 1, lden = 1;
- /* calculate quotient sign and convert operands to unsigned. */
+ /* Calculate quotient sign and convert operands to unsigned. */
if (!uns)
{
if (hnum < 0)
goto finish_up;
}
- memset ((char *) quo, 0, sizeof quo);
+ memset (quo, 0, sizeof quo);
- memset ((char *) num, 0, sizeof num); /* to zero 9th element */
- memset ((char *) den, 0, sizeof den);
+ memset (num, 0, sizeof num); /* to zero 9th element */
+ memset (den, 0, sizeof den);
encode (num, lnum, hnum);
encode (den, lden, hden);
decode (quo, lquo, hquo);
finish_up:
- /* if result is negative, make it so. */
+ /* If result is negative, make it so. */
if (quo_neg)
neg_double (*lquo, *hquo, lquo, hquo);
unsigned HOST_WIDE_INT labs_den = lden, ltwice;
HOST_WIDE_INT habs_den = hden, htwice;
- /* Get absolute values */
+ /* Get absolute values. */
if (*hrem < 0)
neg_double (*lrem, *hrem, &labs_rem, &habs_rem);
if (hden < 0)
return overflow;
}
\f
+/* Determine whether an expression T can be cheaply negated using
+ the function negate_expr. */
+
+static bool
+negate_expr_p (tree t)
+{
+ unsigned HOST_WIDE_INT val;
+ unsigned int prec;
+ tree type;
+
+ if (t == 0)
+ return false;
+
+ type = TREE_TYPE (t);
+
+ STRIP_SIGN_NOPS (t);
+ switch (TREE_CODE (t))
+ {
+ case INTEGER_CST:
+ if (TREE_UNSIGNED (type))
+ return false;
+
+ /* Check that -CST will not overflow type. */
+ prec = TYPE_PRECISION (type);
+ if (prec > HOST_BITS_PER_WIDE_INT)
+ {
+ if (TREE_INT_CST_LOW (t) != 0)
+ return true;
+ prec -= HOST_BITS_PER_WIDE_INT;
+ val = TREE_INT_CST_HIGH (t);
+ }
+ else
+ val = TREE_INT_CST_LOW (t);
+ if (prec < HOST_BITS_PER_WIDE_INT)
+ val &= ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
+ return val != ((unsigned HOST_WIDE_INT) 1 << (prec - 1));
+
+ case REAL_CST:
+ case NEGATE_EXPR:
+ return true;
+
+ case MINUS_EXPR:
+ /* We can't turn -(A-B) into B-A when we honor signed zeros. */
+ return ! FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations;
+
+ case MULT_EXPR:
+ if (TREE_UNSIGNED (TREE_TYPE (t)))
+ break;
+
+ /* Fall through. */
+
+ case RDIV_EXPR:
+ if (! HONOR_SIGN_DEPENDENT_ROUNDING (TYPE_MODE (TREE_TYPE (t))))
+ return negate_expr_p (TREE_OPERAND (t, 1))
+ || negate_expr_p (TREE_OPERAND (t, 0));
+ break;
+
+ default:
+ break;
+ }
+ return false;
+}
+
/* Given T, an expression, return the negation of T. Allow for T to be
null, in which case return null. */
static tree
-negate_expr (t)
- tree t;
+negate_expr (tree t)
{
tree type;
tree tem;
switch (TREE_CODE (t))
{
case INTEGER_CST:
- case REAL_CST:
if (! TREE_UNSIGNED (type)
&& 0 != (tem = fold (build1 (NEGATE_EXPR, type, t)))
&& ! TREE_OVERFLOW (tem))
return tem;
break;
+ case REAL_CST:
+ tem = build_real (type, REAL_VALUE_NEGATE (TREE_REAL_CST (t)));
+ /* Two's complement FP formats, such as c4x, may overflow. */
+ if (! TREE_OVERFLOW (tem))
+ return convert (type, tem);
+ break;
+
case NEGATE_EXPR:
return convert (type, TREE_OPERAND (t, 0));
TREE_OPERAND (t, 0))));
break;
+ case MULT_EXPR:
+ if (TREE_UNSIGNED (TREE_TYPE (t)))
+ break;
+
+ /* Fall through. */
+
+ case RDIV_EXPR:
+ if (! HONOR_SIGN_DEPENDENT_ROUNDING (TYPE_MODE (TREE_TYPE (t))))
+ {
+ tem = TREE_OPERAND (t, 1);
+ if (negate_expr_p (tem))
+ return convert (type,
+ fold (build (TREE_CODE (t), TREE_TYPE (t),
+ TREE_OPERAND (t, 0),
+ negate_expr (tem))));
+ tem = TREE_OPERAND (t, 0);
+ if (negate_expr_p (tem))
+ return convert (type,
+ fold (build (TREE_CODE (t), TREE_TYPE (t),
+ negate_expr (tem),
+ TREE_OPERAND (t, 1))));
+ }
+ break;
+
default:
break;
}
same type as IN, but they will have the same signedness and mode. */
static tree
-split_tree (in, code, conp, litp, minus_litp, negate_p)
- tree in;
- enum tree_code code;
- tree *conp, *litp, *minus_litp;
- int negate_p;
+split_tree (tree in, enum tree_code code, tree *conp, tree *litp,
+ tree *minus_litp, int negate_p)
{
tree var = 0;
we build an operation, do it in TYPE and with CODE. */
static tree
-associate_trees (t1, t2, code, type)
- tree t1, t2;
- enum tree_code code;
- tree type;
+associate_trees (tree t1, tree t2, enum tree_code code, tree type)
{
if (t1 == 0)
return t2;
If NOTRUNC is nonzero, do not truncate the result to fit the data type. */
static tree
-int_const_binop (code, arg1, arg2, notrunc)
- enum tree_code code;
- tree arg1, arg2;
- int notrunc;
+int_const_binop (enum tree_code code, tree arg1, tree arg2, int notrunc)
{
unsigned HOST_WIDE_INT int1l, int2l;
HOST_WIDE_INT int1h, int2h;
low = int1l & int2l, hi = int1h & int2h;
break;
- case BIT_ANDTC_EXPR:
- low = int1l & ~int2l, hi = int1h & ~int2h;
- break;
-
case RSHIFT_EXPR:
int2l = -int2l;
case LSHIFT_EXPR:
If NOTRUNC is nonzero, do not truncate the result to fit the data type. */
static tree
-const_binop (code, arg1, arg2, notrunc)
- enum tree_code code;
- tree arg1, arg2;
- int notrunc;
+const_binop (enum tree_code code, tree arg1, tree arg2, int notrunc)
{
STRIP_NOPS (arg1);
STRIP_NOPS (arg2);
if (TREE_CODE (arg1) == REAL_CST)
{
+ enum machine_mode mode;
REAL_VALUE_TYPE d1;
REAL_VALUE_TYPE d2;
REAL_VALUE_TYPE value;
- tree t;
+ tree t, type;
d1 = TREE_REAL_CST (arg1);
d2 = TREE_REAL_CST (arg2);
+ type = TREE_TYPE (arg1);
+ mode = TYPE_MODE (type);
+
+ /* Don't perform operation if we honor signaling NaNs and
+ either operand is a NaN. */
+ if (HONOR_SNANS (mode)
+ && (REAL_VALUE_ISNAN (d1) || REAL_VALUE_ISNAN (d2)))
+ return NULL_TREE;
+
+ /* Don't perform operation if it would raise a division
+ by zero exception. */
+ if (code == RDIV_EXPR
+ && REAL_VALUES_EQUAL (d2, dconst0)
+ && (flag_trapping_math || ! MODE_HAS_INFINITIES (mode)))
+ return NULL_TREE;
+
/* If either operand is a NaN, just return it. Otherwise, set up
for floating-point trap; we return an overflow. */
if (REAL_VALUE_ISNAN (d1))
REAL_ARITHMETIC (value, code, d1, d2);
- t = build_real (TREE_TYPE (arg1),
- real_value_truncate (TYPE_MODE (TREE_TYPE (arg1)),
- value));
+ t = build_real (type, real_value_truncate (mode, value));
TREE_OVERFLOW (t)
= (force_fit_type (t, 0)
/* Return the hash code code X, an INTEGER_CST. */
static hashval_t
-size_htab_hash (x)
- const void *x;
+size_htab_hash (const void *x)
{
tree t = (tree) x;
is the same as that given by *Y, which is the same. */
static int
-size_htab_eq (x, y)
- const void *x;
- const void *y;
+size_htab_eq (const void *x, const void *y)
{
tree xt = (tree) x;
tree yt = (tree) y;
bits are given by NUMBER and of the sizetype represented by KIND. */
tree
-size_int_wide (number, kind)
- HOST_WIDE_INT number;
- enum size_type_kind kind;
+size_int_wide (HOST_WIDE_INT number, enum size_type_kind kind)
{
return size_int_type_wide (number, sizetype_tab[(int) kind]);
}
htab_t size_htab;
tree
-size_int_type_wide (number, type)
- HOST_WIDE_INT number;
- tree type;
+size_int_type_wide (HOST_WIDE_INT number, tree type)
{
- PTR *slot;
+ void **slot;
if (size_htab == 0)
{
{
tree t = new_const;
- *slot = (PTR) new_const;
+ *slot = new_const;
new_const = make_node (INTEGER_CST);
return t;
}
If the operands are constant, so is the result. */
tree
-size_binop (code, arg0, arg1)
- enum tree_code code;
- tree arg0, arg1;
+size_binop (enum tree_code code, tree arg0, tree arg1)
{
tree type = TREE_TYPE (arg0);
in signed type corresponding to the type of the operands. */
tree
-size_diffop (arg0, arg1)
- tree arg0, arg1;
+size_diffop (tree arg0, tree arg1)
{
tree type = TREE_TYPE (arg0);
tree ctype;
return a constant tree representing the result of conversion. */
static tree
-fold_convert (t, arg1)
- tree t;
- tree arg1;
+fold_convert (tree t, tree arg1)
{
tree type = TREE_TYPE (t);
int overflow = 0;
/* Return an expr equal to X but certainly not valid as an lvalue. */
tree
-non_lvalue (x)
- tree x;
+non_lvalue (tree x)
{
tree result;
pedantic lvalue. Otherwise, return X. */
tree
-pedantic_non_lvalue (x)
- tree x;
+pedantic_non_lvalue (tree x)
{
if (pedantic_lvalues)
return non_lvalue (x);
comparisons, except for NE_EXPR and EQ_EXPR. */
static enum tree_code
-invert_tree_comparison (code)
- enum tree_code code;
+invert_tree_comparison (enum tree_code code)
{
switch (code)
{
swapped. This is safe for floating-point. */
static enum tree_code
-swap_tree_comparison (code)
- enum tree_code code;
+swap_tree_comparison (enum tree_code code)
{
switch (code)
{
compcode_to_comparison. */
static int
-comparison_to_compcode (code)
- enum tree_code code;
+comparison_to_compcode (enum tree_code code)
{
switch (code)
{
inverse of comparison_to_compcode. */
static enum tree_code
-compcode_to_comparison (code)
- int code;
+compcode_to_comparison (int code)
{
switch (code)
{
/* Return nonzero if CODE is a tree code that represents a truth value. */
static int
-truth_value_p (code)
- enum tree_code code;
+truth_value_p (enum tree_code code)
{
return (TREE_CODE_CLASS (code) == '<'
|| code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR
|| code == TRUTH_XOR_EXPR || code == TRUTH_NOT_EXPR);
}
\f
-/* Return nonzero if two operands are necessarily equal.
+/* Return nonzero if two operands (typically of the same tree node)
+ are necessarily equal. If either argument has side-effects this
+ function returns zero.
+
If ONLY_CONST is nonzero, only return nonzero for constants.
This function tests whether the operands are indistinguishable;
it does not test whether they are equal using C's == operation.
The distinction is important for IEEE floating point, because
(1) -0.0 and 0.0 are distinguishable, but -0.0==0.0, and
- (2) two NaNs may be indistinguishable, but NaN!=NaN. */
+ (2) two NaNs may be indistinguishable, but NaN!=NaN.
+
+ If ONLY_CONST is zero, a VAR_DECL is considered equal to itself
+ even though it may hold multiple values during a function.
+ This is because a GCC tree node guarantees that nothing else is
+ executed between the evaluation of its "operands" (which may often
+ be evaluated in arbitrary order). Hence if the operands themselves
+ don't side-effect, the VAR_DECLs, PARM_DECLs etc... must hold the
+ same value in each operand/subexpression. Hence a zero value for
+ ONLY_CONST assumes isochronic (or instantaneous) tree equivalence.
+ If comparing arbitrary expression trees, such as from different
+ statements, ONLY_CONST must usually be nonzero. */
int
-operand_equal_p (arg0, arg1, only_const)
- tree arg0, arg1;
- int only_const;
+operand_equal_p (tree arg0, tree arg1, int only_const)
{
+ tree fndecl;
+
/* If both types don't have the same signedness, then we can't consider
them equal. We must check this before the STRIP_NOPS calls
because they may change the signedness of the arguments. */
TREE_OPERAND (arg1, 0), 0));
case 'r':
- /* If either of the pointer (or reference) expressions we are dereferencing
- contain a side effect, these cannot be equal. */
+ /* If either of the pointer (or reference) expressions we are
+ dereferencing contain a side effect, these cannot be equal. */
if (TREE_SIDE_EFFECTS (arg0)
|| TREE_SIDE_EFFECTS (arg1))
return 0;
}
case 'e':
- if (TREE_CODE (arg0) == RTL_EXPR)
- return rtx_equal_p (RTL_EXPR_RTL (arg0), RTL_EXPR_RTL (arg1));
- return 0;
+ switch (TREE_CODE (arg0))
+ {
+ case ADDR_EXPR:
+ case TRUTH_NOT_EXPR:
+ return operand_equal_p (TREE_OPERAND (arg0, 0),
+ TREE_OPERAND (arg1, 0), 0);
+
+ case RTL_EXPR:
+ return rtx_equal_p (RTL_EXPR_RTL (arg0), RTL_EXPR_RTL (arg1));
+
+ case CALL_EXPR:
+ /* If the CALL_EXPRs call different functions, then they
+ clearly can not be equal. */
+ if (! operand_equal_p (TREE_OPERAND (arg0, 0),
+ TREE_OPERAND (arg1, 0), 0))
+ return 0;
+
+ /* Only consider const functions equivalent. */
+ fndecl = get_callee_fndecl (arg0);
+ if (fndecl == NULL_TREE
+ || ! (flags_from_decl_or_type (fndecl) & ECF_CONST))
+ return 0;
+
+ /* Now see if all the arguments are the same. operand_equal_p
+ does not handle TREE_LIST, so we walk the operands here
+ feeding them to operand_equal_p. */
+ arg0 = TREE_OPERAND (arg0, 1);
+ arg1 = TREE_OPERAND (arg1, 1);
+ while (arg0 && arg1)
+ {
+ if (! operand_equal_p (TREE_VALUE (arg0), TREE_VALUE (arg1), 0))
+ return 0;
+
+ arg0 = TREE_CHAIN (arg0);
+ arg1 = TREE_CHAIN (arg1);
+ }
+
+ /* If we get here and both argument lists are exhausted
+ then the CALL_EXPRs are equal. */
+ return ! (arg0 || arg1);
+
+ default:
+ return 0;
+ }
+
+ case 'd':
+ /* Consider __builtin_sqrt equal to sqrt. */
+ return TREE_CODE (arg0) == FUNCTION_DECL
+ && DECL_BUILT_IN (arg0) && DECL_BUILT_IN (arg1)
+ && DECL_BUILT_IN_CLASS (arg0) == DECL_BUILT_IN_CLASS (arg1)
+ && DECL_FUNCTION_CODE (arg0) == DECL_FUNCTION_CODE (arg1);
default:
return 0;
When in doubt, return 0. */
static int
-operand_equal_for_comparison_p (arg0, arg1, other)
- tree arg0, arg1;
- tree other;
+operand_equal_for_comparison_p (tree arg0, tree arg1, tree other)
{
int unsignedp1, unsignedpo;
tree primarg0, primarg1, primother;
If this is true, return 1. Otherwise, return zero. */
static int
-twoval_comparison_p (arg, cval1, cval2, save_p)
- tree arg;
- tree *cval1, *cval2;
- int *save_p;
+twoval_comparison_p (tree arg, tree *cval1, tree *cval2, int *save_p)
{
enum tree_code code = TREE_CODE (arg);
char class = TREE_CODE_CLASS (code);
NEW1 and OLD1. */
static tree
-eval_subst (arg, old0, new0, old1, new1)
- tree arg;
- tree old0, new0, old1, new1;
+eval_subst (tree arg, tree old0, tree new0, tree old1, tree new1)
{
tree type = TREE_TYPE (arg);
enum tree_code code = TREE_CODE (arg);
default:
break;
}
- /* fall through - ??? */
+ /* Fall through - ??? */
case '<':
{
If OMITTED has side effects, we must evaluate it. Otherwise, just do
the conversion of RESULT to TYPE. */
-static tree
-omit_one_operand (type, result, omitted)
- tree type, result, omitted;
+tree
+omit_one_operand (tree type, tree result, tree omitted)
{
tree t = convert (type, result);
/* Similar, but call pedantic_non_lvalue instead of non_lvalue. */
static tree
-pedantic_omit_one_operand (type, result, omitted)
- tree type, result, omitted;
+pedantic_omit_one_operand (tree type, tree result, tree omitted)
{
tree t = convert (type, result);
returns a truth value (0 or 1). */
tree
-invert_truthvalue (arg)
- tree arg;
+invert_truthvalue (tree arg)
{
tree type = TREE_TYPE (arg);
enum tree_code code = TREE_CODE (arg);
operands are another bit-wise operation with a common input. If so,
distribute the bit operations to save an operation and possibly two if
constants are involved. For example, convert
- (A | B) & (A | C) into A | (B & C)
+ (A | B) & (A | C) into A | (B & C)
Further simplification will occur if B and C are constants.
If this optimization cannot be done, 0 will be returned. */
static tree
-distribute_bit_expr (code, type, arg0, arg1)
- enum tree_code code;
- tree type;
- tree arg0, arg1;
+distribute_bit_expr (enum tree_code code, tree type, tree arg0, tree arg1)
{
tree common;
tree left, right;
starting at BITPOS. The field is unsigned if UNSIGNEDP is nonzero. */
static tree
-make_bit_field_ref (inner, type, bitsize, bitpos, unsignedp)
- tree inner;
- tree type;
- int bitsize, bitpos;
- int unsignedp;
+make_bit_field_ref (tree inner, tree type, int bitsize, int bitpos,
+ int unsignedp)
{
tree result = build (BIT_FIELD_REF, type, inner,
size_int (bitsize), bitsize_int (bitpos));
tree. Otherwise we return zero. */
static tree
-optimize_bit_field_compare (code, compare_type, lhs, rhs)
- enum tree_code code;
- tree compare_type;
- tree lhs, rhs;
+optimize_bit_field_compare (enum tree_code code, tree compare_type,
+ tree lhs, tree rhs)
{
HOST_WIDE_INT lbitpos, lbitsize, rbitpos, rbitsize, nbitpos, nbitsize;
tree type = TREE_TYPE (lhs);
do anything with. */
static tree
-decode_field_reference (exp, pbitsize, pbitpos, pmode, punsignedp,
- pvolatilep, pmask, pand_mask)
- tree exp;
- HOST_WIDE_INT *pbitsize, *pbitpos;
- enum machine_mode *pmode;
- int *punsignedp, *pvolatilep;
- tree *pmask;
- tree *pand_mask;
+decode_field_reference (tree exp, HOST_WIDE_INT *pbitsize,
+ HOST_WIDE_INT *pbitpos, enum machine_mode *pmode,
+ int *punsignedp, int *pvolatilep,
+ tree *pmask, tree *pand_mask)
{
+ tree outer_type = 0;
tree and_mask = 0;
tree mask, inner, offset;
tree unsigned_type;
if (! INTEGRAL_TYPE_P (TREE_TYPE (exp)))
return 0;
+ /* We are interested in the bare arrangement of bits, so strip everything
+ that doesn't affect the machine mode. However, record the type of the
+ outermost expression if it may matter below. */
+ if (TREE_CODE (exp) == NOP_EXPR
+ || TREE_CODE (exp) == CONVERT_EXPR
+ || TREE_CODE (exp) == NON_LVALUE_EXPR)
+ outer_type = TREE_TYPE (exp);
STRIP_NOPS (exp);
if (TREE_CODE (exp) == BIT_AND_EXPR)
|| TREE_CODE (inner) == PLACEHOLDER_EXPR)
return 0;
+ /* If the number of bits in the reference is the same as the bitsize of
+ the outer type, then the outer type gives the signedness. Otherwise
+ (in case of a small bitfield) the signedness is unchanged. */
+ if (outer_type && *pbitsize == tree_low_cst (TYPE_SIZE (outer_type), 1))
+ *punsignedp = TREE_UNSIGNED (outer_type);
+
/* Compute the mask to access the bitfield. */
unsigned_type = (*lang_hooks.types.type_for_size) (*pbitsize, 1);
precision = TYPE_PRECISION (unsigned_type);
bit positions. */
static int
-all_ones_mask_p (mask, size)
- tree mask;
- int size;
+all_ones_mask_p (tree mask, int size)
{
tree type = TREE_TYPE (mask);
unsigned int precision = TYPE_PRECISION (type);
or NULL_TREE otherwise. */
static tree
-sign_bit_p (exp, val)
- tree exp;
- tree val;
+sign_bit_p (tree exp, tree val)
{
- unsigned HOST_WIDE_INT lo;
- HOST_WIDE_INT hi;
+ unsigned HOST_WIDE_INT mask_lo, lo;
+ HOST_WIDE_INT mask_hi, hi;
int width;
tree t;
{
hi = (unsigned HOST_WIDE_INT) 1 << (width - HOST_BITS_PER_WIDE_INT - 1);
lo = 0;
+
+ mask_hi = ((unsigned HOST_WIDE_INT) -1
+ >> (2 * HOST_BITS_PER_WIDE_INT - width));
+ mask_lo = -1;
}
else
{
hi = 0;
lo = (unsigned HOST_WIDE_INT) 1 << (width - 1);
+
+ mask_hi = 0;
+ mask_lo = ((unsigned HOST_WIDE_INT) -1
+ >> (HOST_BITS_PER_WIDE_INT - width));
}
- if (TREE_INT_CST_HIGH (val) == hi && TREE_INT_CST_LOW (val) == lo)
+ /* We mask off those bits beyond TREE_TYPE (exp) so that we can
+ treat VAL as if it were unsigned. */
+ if ((TREE_INT_CST_HIGH (val) & mask_hi) == hi
+ && (TREE_INT_CST_LOW (val) & mask_lo) == lo)
return exp;
/* Handle extension from a narrower type. */
to be evaluated unconditionally. */
static int
-simple_operand_p (exp)
- tree exp;
+simple_operand_p (tree exp)
{
/* Strip any conversions that don't change the machine mode. */
while ((TREE_CODE (exp) == NOP_EXPR
try to change a logical combination of comparisons into a range test.
For example, both
- X == 2 || X == 3 || X == 4 || X == 5
+ X == 2 || X == 3 || X == 4 || X == 5
and
- X >= 2 && X <= 5
+ X >= 2 && X <= 5
are converted to
(unsigned) (X - 2) <= 3
type if both are specified. */
static tree
-range_binop (code, type, arg0, upper0_p, arg1, upper1_p)
- enum tree_code code;
- tree type;
- tree arg0, arg1;
- int upper0_p, upper1_p;
+range_binop (enum tree_code code, tree type, tree arg0, int upper0_p,
+ tree arg1, int upper1_p)
{
tree tem;
int result;
likely not be returning a useful value and range. */
static tree
-make_range (exp, pin_p, plow, phigh)
- tree exp;
- int *pin_p;
- tree *plow, *phigh;
+make_range (tree exp, int *pin_p, tree *plow, tree *phigh)
{
enum tree_code code;
tree arg0 = NULL_TREE, arg1 = NULL_TREE, type = NULL_TREE;
if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)))
{
- arg0 = TREE_OPERAND (exp, 0);
+ if (first_rtl_op (code) > 0)
+ arg0 = TREE_OPERAND (exp, 0);
if (TREE_CODE_CLASS (code) == '<'
|| TREE_CODE_CLASS (code) == '1'
|| TREE_CODE_CLASS (code) == '2')
on IN_P) the range. */
static tree
-build_range_check (type, exp, in_p, low, high)
- tree type;
- tree exp;
- int in_p;
- tree low, high;
+build_range_check (tree type, tree exp, int in_p, tree low, tree high)
{
tree etype = TREE_TYPE (exp);
tree value;
can, 0 if we can't. Set the output range into the specified parameters. */
static int
-merge_ranges (pin_p, plow, phigh, in0_p, low0, high0, in1_p, low1, high1)
- int *pin_p;
- tree *plow, *phigh;
- int in0_p, in1_p;
- tree low0, high0, low1, high1;
+merge_ranges (int *pin_p, tree *plow, tree *phigh, int in0_p, tree low0,
+ tree high0, int in1_p, tree low1, tree high1)
{
int no_overlap;
int subset;
return 1;
}
\f
+#ifndef RANGE_TEST_NON_SHORT_CIRCUIT
+#define RANGE_TEST_NON_SHORT_CIRCUIT (BRANCH_COST >= 2)
+#endif
+
/* EXP is some logical combination of boolean tests. See if we can
merge it into some range test. Return the new tree if so. */
static tree
-fold_range_test (exp)
- tree exp;
+fold_range_test (tree exp)
{
int or_op = (TREE_CODE (exp) == TRUTH_ORIF_EXPR
|| TREE_CODE (exp) == TRUTH_OR_EXPR);
/* On machines where the branch cost is expensive, if this is a
short-circuited branch and the underlying object on both sides
is the same, make a non-short-circuit operation. */
- else if (BRANCH_COST >= 2
+ else if (RANGE_TEST_NON_SHORT_CIRCUIT
&& lhs != 0 && rhs != 0
&& (TREE_CODE (exp) == TRUTH_ANDIF_EXPR
|| TREE_CODE (exp) == TRUTH_ORIF_EXPR)
TREE_OPERAND (exp, 1));
else if ((*lang_hooks.decls.global_bindings_p) () == 0
- && ! contains_placeholder_p (lhs))
+ && ! CONTAINS_PLACEHOLDER_P (lhs))
{
tree common = save_expr (lhs);
it is an INTEGER_CST that should be AND'ed with the extra bits. */
static tree
-unextend (c, p, unsignedp, mask)
- tree c;
- int p;
- int unsignedp;
- tree mask;
+unextend (tree c, int p, int unsignedp, tree mask)
{
tree type = TREE_TYPE (c);
int modesize = GET_MODE_BITSIZE (TYPE_MODE (type));
We return the simplified tree or 0 if no optimization is possible. */
static tree
-fold_truthop (code, truth_type, lhs, rhs)
- enum tree_code code;
- tree truth_type, lhs, rhs;
+fold_truthop (enum tree_code code, tree truth_type, tree lhs, tree rhs)
{
/* If this is the "or" of two comparisons, we can do something if
the comparisons are NE_EXPR. If this is the "and", we can do something
if the comparisons are EQ_EXPR. I.e.,
- (a->b == 2 && a->c == 4) can become (a->new == NEW).
+ (a->b == 2 && a->c == 4) can become (a->new == NEW).
WANTED_CODE is this operation code. For single bit fields, we can
convert EQ_EXPR to NE_EXPR so we need not reject the "wrong"
constant. */
static tree
-optimize_minmax_comparison (t)
- tree t;
+optimize_minmax_comparison (tree t)
{
tree type = TREE_TYPE (t);
tree arg0 = TREE_OPERAND (t, 0);
original computation, but need not be in the original type. */
static tree
-extract_muldiv (t, c, code, wide_type)
- tree t;
- tree c;
- enum tree_code code;
- tree wide_type;
+extract_muldiv (tree t, tree c, enum tree_code code, tree wide_type)
+{
+ /* To avoid exponential search depth, refuse to allow recursion past
+ three levels. Beyond that (1) it's highly unlikely that we'll find
+ something interesting and (2) we've probably processed it before
+ when we built the inner expression. */
+
+ static int depth;
+ tree ret;
+
+ if (depth > 3)
+ return NULL;
+
+ depth++;
+ ret = extract_muldiv_1 (t, c, code, wide_type);
+ depth--;
+
+ return ret;
+}
+
+static tree
+extract_muldiv_1 (tree t, tree c, enum tree_code code, tree wide_type)
{
tree type = TREE_TYPE (t);
enum tree_code tcode = TREE_CODE (t);
/* ... or its type is larger than ctype,
then we cannot pass through this truncation. */
|| (GET_MODE_SIZE (TYPE_MODE (ctype))
- < GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0))))))
+ < GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0))))
+ /* ... or signedness changes for division or modulus,
+ then we cannot pass through this conversion. */
+ || (code != MULT_EXPR
+ && (TREE_UNSIGNED (ctype)
+ != TREE_UNSIGNED (TREE_TYPE (op0))))))
break;
/* Pass the constant down and see if we can make a simplification. If
we can, replace this expression with the inner simplification for
possible later conversion to our or some other type. */
- if (0 != (t1 = extract_muldiv (op0, convert (TREE_TYPE (op0), c), code,
- code == MULT_EXPR ? ctype : NULL_TREE)))
+ if ((t2 = convert (TREE_TYPE (op0), c)) != 0
+ && TREE_CODE (t2) == INTEGER_CST
+ && ! TREE_CONSTANT_OVERFLOW (t2)
+ && (0 != (t1 = extract_muldiv (op0, t2, code,
+ code == MULT_EXPR
+ ? ctype : NULL_TREE))))
return t1;
break;
TREE_OPERAND (t, 1));
break;
- case SAVE_EXPR:
- /* If this has not been evaluated and the operand has no side effects,
- we can see if we can do something inside it and make a new one.
- Note that this test is overly conservative since we can do this
- if the only reason it had side effects is that it was another
- similar SAVE_EXPR, but that isn't worth bothering with. */
- if (SAVE_EXPR_RTL (t) == 0 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (t, 0))
- && 0 != (t1 = extract_muldiv (TREE_OPERAND (t, 0), c, code,
- wide_type)))
- {
- t1 = save_expr (t1);
- if (SAVE_EXPR_PERSISTENT_P (t) && TREE_CODE (t1) == SAVE_EXPR)
- SAVE_EXPR_PERSISTENT_P (t1) = 1;
- if (is_pending_size (t))
- put_pending_size (t1);
- return t1;
- }
- break;
-
case LSHIFT_EXPR: case RSHIFT_EXPR:
/* If the second operand is constant, this is a multiplication
or floor division, by a power of two, so we can treat it that
overflowed. */
if ((! TREE_UNSIGNED (ctype)
|| (TREE_CODE (ctype) == INTEGER_TYPE && TYPE_IS_SIZETYPE (ctype)))
+ && ! flag_wrapv
&& ((code == MULT_EXPR && tcode == EXACT_DIV_EXPR)
|| (tcode == MULT_EXPR
&& code != TRUNC_MOD_EXPR && code != CEIL_MOD_EXPR
that we may sometimes modify the tree. */
static tree
-strip_compound_expr (t, s)
- tree t;
- tree s;
+strip_compound_expr (tree t, tree s)
{
enum tree_code code = TREE_CODE (t);
1), and is of the indicated TYPE. */
static tree
-constant_boolean_node (value, type)
- int value;
- tree type;
+constant_boolean_node (int value, tree type)
{
if (type == integer_type_node)
return value ? integer_one_node : integer_zero_node;
we don't care (to avoid spending too much time on complex expressions.). */
static int
-count_cond (expr, lim)
- tree expr;
- int lim;
+count_cond (tree expr, int lim)
{
int ctrue, cfalse;
original expression. */
static tree
-fold_binary_op_with_conditional_arg (code, type, cond, arg, cond_first_p)
- enum tree_code code;
- tree type;
- tree cond;
- tree arg;
- int cond_first_p;
+fold_binary_op_with_conditional_arg (enum tree_code code, tree type,
+ tree cond, tree arg, int cond_first_p)
{
tree test, true_value, false_value;
tree lhs = NULL_TREE;
false_value = convert (testtype, integer_zero_node);
}
- /* If ARG is complex we want to make sure we only evaluate
- it once. Though this is only required if it is volatile, it
- might be more efficient even if it is not. However, if we
- succeed in folding one part to a constant, we do not need
- to make this SAVE_EXPR. Since we do this optimization
- primarily to see if we do end up with constant and this
- SAVE_EXPR interferes with later optimizations, suppressing
- it when we can is important.
-
- If we are not in a function, we can't make a SAVE_EXPR, so don't
- try to do so. Don't try to see if the result is a constant
- if an arm is a COND_EXPR since we get exponential behavior
- in that case. */
-
- if (TREE_CODE (arg) == SAVE_EXPR)
+ /* If ARG is complex we want to make sure we only evaluate it once. Though
+ this is only required if it is volatile, it might be more efficient even
+ if it is not. However, if we succeed in folding one part to a constant,
+ we do not need to make this SAVE_EXPR. Since we do this optimization
+ primarily to see if we do end up with constant and this SAVE_EXPR
+ interferes with later optimizations, suppressing it when we can is
+ important.
+
+ If we are not in a function, we can't make a SAVE_EXPR, so don't try to
+ do so. Don't try to see if the result is a constant if an arm is a
+ COND_EXPR since we get exponential behavior in that case. */
+
+ if (saved_expr_p (arg))
save = 1;
else if (lhs == 0 && rhs == 0
&& !TREE_CONSTANT (arg)
modes, X + 0 is not the same as X because -0 + 0 is 0. */
static bool
-fold_real_zero_addition_p (type, addend, negate)
- tree type, addend;
- int negate;
+fold_real_zero_addition_p (tree type, tree addend, int negate)
{
if (!real_zerop (addend))
return false;
+ /* Don't allow the fold with -fsignaling-nans. */
+ if (HONOR_SNANS (TYPE_MODE (type)))
+ return false;
+
/* Allow the fold if zeros aren't signed, or their sign isn't important. */
if (!HONOR_SIGNED_ZEROS (TYPE_MODE (type)))
return true;
return negate && !HONOR_SIGN_DEPENDENT_ROUNDING (TYPE_MODE (type));
}
+/* Subroutine of fold() that checks comparisons of built-in math
+ functions against real constants.
+
+ FCODE is the DECL_FUNCTION_CODE of the built-in, CODE is the comparison
+ operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR, GE_EXPR or LE_EXPR. TYPE
+ is the type of the result and ARG0 and ARG1 are the operands of the
+ comparison. ARG1 must be a TREE_REAL_CST.
+
+ The function returns the constant folded tree if a simplification
+ can be made, and NULL_TREE otherwise. */
+
+static tree
+fold_mathfn_compare (enum built_in_function fcode, enum tree_code code,
+ tree type, tree arg0, tree arg1)
+{
+ REAL_VALUE_TYPE c;
+
+ if (fcode == BUILT_IN_SQRT
+ || fcode == BUILT_IN_SQRTF
+ || fcode == BUILT_IN_SQRTL)
+ {
+ tree arg = TREE_VALUE (TREE_OPERAND (arg0, 1));
+ enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg0));
+
+ c = TREE_REAL_CST (arg1);
+ if (REAL_VALUE_NEGATIVE (c))
+ {
+ /* sqrt(x) < y is always false, if y is negative. */
+ if (code == EQ_EXPR || code == LT_EXPR || code == LE_EXPR)
+ return omit_one_operand (type,
+ convert (type, integer_zero_node),
+ arg);
+
+ /* sqrt(x) > y is always true, if y is negative and we
+ don't care about NaNs, i.e. negative values of x. */
+ if (code == NE_EXPR || !HONOR_NANS (mode))
+ return omit_one_operand (type,
+ convert (type, integer_one_node),
+ arg);
+
+ /* sqrt(x) > y is the same as x >= 0, if y is negative. */
+ return fold (build (GE_EXPR, type, arg,
+ build_real (TREE_TYPE (arg), dconst0)));
+ }
+ else if (code == GT_EXPR || code == GE_EXPR)
+ {
+ REAL_VALUE_TYPE c2;
+
+ REAL_ARITHMETIC (c2, MULT_EXPR, c, c);
+ real_convert (&c2, mode, &c2);
+
+ if (REAL_VALUE_ISINF (c2))
+ {
+ /* sqrt(x) > y is x == +Inf, when y is very large. */
+ if (HONOR_INFINITIES (mode))
+ return fold (build (EQ_EXPR, type, arg,
+ build_real (TREE_TYPE (arg), c2)));
+
+ /* sqrt(x) > y is always false, when y is very large
+ and we don't care about infinities. */
+ return omit_one_operand (type,
+ convert (type, integer_zero_node),
+ arg);
+ }
+
+ /* sqrt(x) > c is the same as x > c*c. */
+ return fold (build (code, type, arg,
+ build_real (TREE_TYPE (arg), c2)));
+ }
+ else if (code == LT_EXPR || code == LE_EXPR)
+ {
+ REAL_VALUE_TYPE c2;
+
+ REAL_ARITHMETIC (c2, MULT_EXPR, c, c);
+ real_convert (&c2, mode, &c2);
+
+ if (REAL_VALUE_ISINF (c2))
+ {
+ /* sqrt(x) < y is always true, when y is a very large
+ value and we don't care about NaNs or Infinities. */
+ if (! HONOR_NANS (mode) && ! HONOR_INFINITIES (mode))
+ return omit_one_operand (type,
+ convert (type, integer_one_node),
+ arg);
+
+ /* sqrt(x) < y is x != +Inf when y is very large and we
+ don't care about NaNs. */
+ if (! HONOR_NANS (mode))
+ return fold (build (NE_EXPR, type, arg,
+ build_real (TREE_TYPE (arg), c2)));
+
+ /* sqrt(x) < y is x >= 0 when y is very large and we
+ don't care about Infinities. */
+ if (! HONOR_INFINITIES (mode))
+ return fold (build (GE_EXPR, type, arg,
+ build_real (TREE_TYPE (arg), dconst0)));
+
+ /* sqrt(x) < y is x >= 0 && x != +Inf, when y is large. */
+ if ((*lang_hooks.decls.global_bindings_p) () != 0
+ || CONTAINS_PLACEHOLDER_P (arg))
+ return NULL_TREE;
+
+ arg = save_expr (arg);
+ return fold (build (TRUTH_ANDIF_EXPR, type,
+ fold (build (GE_EXPR, type, arg,
+ build_real (TREE_TYPE (arg),
+ dconst0))),
+ fold (build (NE_EXPR, type, arg,
+ build_real (TREE_TYPE (arg),
+ c2)))));
+ }
+
+ /* sqrt(x) < c is the same as x < c*c, if we ignore NaNs. */
+ if (! HONOR_NANS (mode))
+ return fold (build (code, type, arg,
+ build_real (TREE_TYPE (arg), c2)));
+
+ /* sqrt(x) < c is the same as x >= 0 && x < c*c. */
+ if ((*lang_hooks.decls.global_bindings_p) () == 0
+ && ! CONTAINS_PLACEHOLDER_P (arg))
+ {
+ arg = save_expr (arg);
+ return fold (build (TRUTH_ANDIF_EXPR, type,
+ fold (build (GE_EXPR, type, arg,
+ build_real (TREE_TYPE (arg),
+ dconst0))),
+ fold (build (code, type, arg,
+ build_real (TREE_TYPE (arg),
+ c2)))));
+ }
+ }
+ }
+
+ return NULL_TREE;
+}
+
+/* Subroutine of fold() that optimizes comparisons against Infinities,
+ either +Inf or -Inf.
+
+ CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR,
+ GE_EXPR or LE_EXPR. TYPE is the type of the result and ARG0 and ARG1
+ are the operands of the comparison. ARG1 must be a TREE_REAL_CST.
+
+ The function returns the constant folded tree if a simplification
+ can be made, and NULL_TREE otherwise. */
+
+static tree
+fold_inf_compare (enum tree_code code, tree type, tree arg0, tree arg1)
+{
+ enum machine_mode mode;
+ REAL_VALUE_TYPE max;
+ tree temp;
+ bool neg;
+
+ mode = TYPE_MODE (TREE_TYPE (arg0));
+
+ /* For negative infinity swap the sense of the comparison. */
+ neg = REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg1));
+ if (neg)
+ code = swap_tree_comparison (code);
+
+ switch (code)
+ {
+ case GT_EXPR:
+ /* x > +Inf is always false, if with ignore sNANs. */
+ if (HONOR_SNANS (mode))
+ return NULL_TREE;
+ return omit_one_operand (type,
+ convert (type, integer_zero_node),
+ arg0);
+
+ case LE_EXPR:
+ /* x <= +Inf is always true, if we don't case about NaNs. */
+ if (! HONOR_NANS (mode))
+ return omit_one_operand (type,
+ convert (type, integer_one_node),
+ arg0);
+
+ /* x <= +Inf is the same as x == x, i.e. isfinite(x). */
+ if ((*lang_hooks.decls.global_bindings_p) () == 0
+ && ! CONTAINS_PLACEHOLDER_P (arg0))
+ {
+ arg0 = save_expr (arg0);
+ return fold (build (EQ_EXPR, type, arg0, arg0));
+ }
+ break;
+
+ case EQ_EXPR:
+ case GE_EXPR:
+ /* x == +Inf and x >= +Inf are always equal to x > DBL_MAX. */
+ real_maxval (&max, neg, mode);
+ return fold (build (neg ? LT_EXPR : GT_EXPR, type,
+ arg0, build_real (TREE_TYPE (arg0), max)));
+
+ case LT_EXPR:
+ /* x < +Inf is always equal to x <= DBL_MAX. */
+ real_maxval (&max, neg, mode);
+ return fold (build (neg ? GE_EXPR : LE_EXPR, type,
+ arg0, build_real (TREE_TYPE (arg0), max)));
+
+ case NE_EXPR:
+ /* x != +Inf is always equal to !(x > DBL_MAX). */
+ real_maxval (&max, neg, mode);
+ if (! HONOR_NANS (mode))
+ return fold (build (neg ? GE_EXPR : LE_EXPR, type,
+ arg0, build_real (TREE_TYPE (arg0), max)));
+ temp = fold (build (neg ? LT_EXPR : GT_EXPR, type,
+ arg0, build_real (TREE_TYPE (arg0), max)));
+ return fold (build1 (TRUTH_NOT_EXPR, type, temp));
+
+ default:
+ break;
+ }
+
+ return NULL_TREE;
+}
+
+/* If CODE with arguments ARG0 and ARG1 represents a single bit
+ equality/inequality test, then return a simplified form of
+ the test using shifts and logical operations. Otherwise return
+ NULL. TYPE is the desired result type. */
+
+tree
+fold_single_bit_test (enum tree_code code, tree arg0, tree arg1,
+ tree result_type)
+{
+ /* If this is a TRUTH_NOT_EXPR, it may have a single bit test inside
+ operand 0. */
+ if (code == TRUTH_NOT_EXPR)
+ {
+ code = TREE_CODE (arg0);
+ if (code != NE_EXPR && code != EQ_EXPR)
+ return NULL_TREE;
+
+ /* Extract the arguments of the EQ/NE. */
+ arg1 = TREE_OPERAND (arg0, 1);
+ arg0 = TREE_OPERAND (arg0, 0);
+
+ /* This requires us to invert the code. */
+ code = (code == EQ_EXPR ? NE_EXPR : EQ_EXPR);
+ }
+
+ /* If this is testing a single bit, we can optimize the test. */
+ if ((code == NE_EXPR || code == EQ_EXPR)
+ && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1)
+ && integer_pow2p (TREE_OPERAND (arg0, 1)))
+ {
+ tree inner = TREE_OPERAND (arg0, 0);
+ tree type = TREE_TYPE (arg0);
+ int bitnum = tree_log2 (TREE_OPERAND (arg0, 1));
+ enum machine_mode operand_mode = TYPE_MODE (type);
+ int ops_unsigned;
+ tree signed_type, unsigned_type;
+ tree arg00;
+
+ /* If we have (A & C) != 0 where C is the sign bit of A, convert
+ this into A < 0. Similarly for (A & C) == 0 into A >= 0. */
+ arg00 = sign_bit_p (TREE_OPERAND (arg0, 0), TREE_OPERAND (arg0, 1));
+ if (arg00 != NULL_TREE)
+ {
+ tree stype = (*lang_hooks.types.signed_type) (TREE_TYPE (arg00));
+ return fold (build (code == EQ_EXPR ? GE_EXPR : LT_EXPR, result_type,
+ convert (stype, arg00),
+ convert (stype, integer_zero_node)));
+ }
+
+ /* At this point, we know that arg0 is not testing the sign bit. */
+ if (TYPE_PRECISION (type) - 1 == bitnum)
+ abort ();
+
+ /* Otherwise we have (A & C) != 0 where C is a single bit,
+ convert that into ((A >> C2) & 1). Where C2 = log2(C).
+ Similarly for (A & C) == 0. */
+
+ /* If INNER is a right shift of a constant and it plus BITNUM does
+ not overflow, adjust BITNUM and INNER. */
+ if (TREE_CODE (inner) == RSHIFT_EXPR
+ && TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST
+ && TREE_INT_CST_HIGH (TREE_OPERAND (inner, 1)) == 0
+ && bitnum < TYPE_PRECISION (type)
+ && 0 > compare_tree_int (TREE_OPERAND (inner, 1),
+ bitnum - TYPE_PRECISION (type)))
+ {
+ bitnum += TREE_INT_CST_LOW (TREE_OPERAND (inner, 1));
+ inner = TREE_OPERAND (inner, 0);
+ }
+
+ /* If we are going to be able to omit the AND below, we must do our
+ operations as unsigned. If we must use the AND, we have a choice.
+ Normally unsigned is faster, but for some machines signed is. */
+#ifdef LOAD_EXTEND_OP
+ ops_unsigned = (LOAD_EXTEND_OP (operand_mode) == SIGN_EXTEND ? 0 : 1);
+#else
+ ops_unsigned = 1;
+#endif
+
+ signed_type = (*lang_hooks.types.type_for_mode) (operand_mode, 0);
+ unsigned_type = (*lang_hooks.types.type_for_mode) (operand_mode, 1);
+
+ if (bitnum != 0)
+ inner = build (RSHIFT_EXPR, ops_unsigned ? unsigned_type : signed_type,
+ inner, size_int (bitnum));
+
+ if (code == EQ_EXPR)
+ inner = build (BIT_XOR_EXPR, ops_unsigned ? unsigned_type : signed_type,
+ inner, integer_one_node);
+
+ /* Put the AND last so it can combine with more things. */
+ inner = build (BIT_AND_EXPR, ops_unsigned ? unsigned_type : signed_type,
+ inner, integer_one_node);
+
+ /* Make sure to return the proper type. */
+ if (TREE_TYPE (inner) != result_type)
+ inner = convert (result_type, inner);
+
+ return inner;
+ }
+ return NULL_TREE;
+}
+
+/* Test whether it is preferable two swap two operands, ARG0 and
+ ARG1, for example because ARG0 is an integer constant and ARG1
+ isn't. */
+
+static bool
+tree_swap_operands_p (tree arg0, tree arg1)
+{
+ STRIP_SIGN_NOPS (arg0);
+ STRIP_SIGN_NOPS (arg1);
+
+ if (TREE_CODE (arg1) == INTEGER_CST)
+ return 0;
+ if (TREE_CODE (arg0) == INTEGER_CST)
+ return 1;
+
+ if (TREE_CODE (arg1) == REAL_CST)
+ return 0;
+ if (TREE_CODE (arg0) == REAL_CST)
+ return 1;
+
+ if (TREE_CODE (arg1) == COMPLEX_CST)
+ return 0;
+ if (TREE_CODE (arg0) == COMPLEX_CST)
+ return 1;
+
+ if (TREE_CONSTANT (arg1))
+ return 0;
+ if (TREE_CONSTANT (arg0))
+ return 1;
+
+ return 0;
+}
/* Perform constant folding and related simplification of EXPR.
The related simplifications include x*1 => x, x*0 => 0, etc.,
We cannot simplify through a CONVERT_EXPR, FIX_EXPR or FLOAT_EXPR,
but we can constant-fold them if they have constant operands. */
+#ifdef ENABLE_FOLD_CHECKING
+# define fold(x) fold_1 (x)
+static tree fold_1 (tree);
+static
+#endif
tree
-fold (expr)
- tree expr;
+fold (tree expr)
{
- tree t = expr;
+ tree t = expr, orig_t;
tree t1 = NULL_TREE;
tree tem;
tree type = TREE_TYPE (expr);
#ifdef MAX_INTEGER_COMPUTATION_MODE
check_max_integer_computation_mode (expr);
#endif
+ orig_t = t;
if (code == NOP_EXPR || code == FLOAT_EXPR || code == CONVERT_EXPR)
{
subop = arg0;
if (subop != 0 && TREE_CODE (subop) != INTEGER_CST
- && TREE_CODE (subop) != REAL_CST
- )
+ && TREE_CODE (subop) != REAL_CST)
/* Note that TREE_CONSTANT isn't enough:
static var addresses are constant but we can't
do arithmetic on them. */
wins = 0;
}
- else if (IS_EXPR_CODE_CLASS (kind) || kind == 'r')
+ else if (IS_EXPR_CODE_CLASS (kind))
{
int len = first_rtl_op (code);
int i;
if ((code == PLUS_EXPR || code == MULT_EXPR || code == MIN_EXPR
|| code == MAX_EXPR || code == BIT_IOR_EXPR || code == BIT_XOR_EXPR
|| code == BIT_AND_EXPR)
- && (TREE_CODE (arg0) == INTEGER_CST || TREE_CODE (arg0) == REAL_CST))
- {
- tem = arg0; arg0 = arg1; arg1 = tem;
-
- tem = TREE_OPERAND (t, 0); TREE_OPERAND (t, 0) = TREE_OPERAND (t, 1);
- TREE_OPERAND (t, 1) = tem;
- }
+ && tree_swap_operands_p (arg0, arg1))
+ return fold (build (code, type, arg1, arg0));
/* Now WINS is set as described above,
ARG0 is the first operand of EXPR,
fold (build1 (code, type, integer_one_node)),
fold (build1 (code, type, integer_zero_node))));
}
+ else if (TREE_CODE_CLASS (code) == '<'
+ && TREE_CODE (arg0) == COMPOUND_EXPR)
+ return build (COMPOUND_EXPR, type, TREE_OPERAND (arg0, 0),
+ fold (build (code, type, TREE_OPERAND (arg0, 1), arg1)));
+ else if (TREE_CODE_CLASS (code) == '<'
+ && TREE_CODE (arg1) == COMPOUND_EXPR)
+ return build (COMPOUND_EXPR, type, TREE_OPERAND (arg1, 0),
+ fold (build (code, type, arg0, TREE_OPERAND (arg1, 1))));
else if (TREE_CODE_CLASS (code) == '2'
|| TREE_CODE_CLASS (code) == '<')
{
|| count_cond (arg0, 25) + count_cond (arg1, 25) <= 25)
&& (! TREE_SIDE_EFFECTS (arg0)
|| ((*lang_hooks.decls.global_bindings_p) () == 0
- && ! contains_placeholder_p (arg0))))
+ && ! CONTAINS_PLACEHOLDER_P (arg0))))
return
fold_binary_op_with_conditional_arg (code, type, arg1, arg0,
/*cond_first_p=*/0);
|| count_cond (arg0, 25) + count_cond (arg1, 25) <= 25)
&& (! TREE_SIDE_EFFECTS (arg1)
|| ((*lang_hooks.decls.global_bindings_p) () == 0
- && ! contains_placeholder_p (arg1))))
+ && ! CONTAINS_PLACEHOLDER_P (arg1))))
return
fold_binary_op_with_conditional_arg (code, type, arg0, arg1,
/*cond_first_p=*/1);
}
- else if (TREE_CODE_CLASS (code) == '<'
- && TREE_CODE (arg0) == COMPOUND_EXPR)
- return build (COMPOUND_EXPR, type, TREE_OPERAND (arg0, 0),
- fold (build (code, type, TREE_OPERAND (arg0, 1), arg1)));
- else if (TREE_CODE_CLASS (code) == '<'
- && TREE_CODE (arg1) == COMPOUND_EXPR)
- return build (COMPOUND_EXPR, type, TREE_OPERAND (arg1, 0),
- fold (build (code, type, arg0, TREE_OPERAND (arg1, 1))));
switch (code)
{
/* Don't leave an assignment inside a conversion
unless assigning a bitfield. */
tree prev = TREE_OPERAND (t, 0);
+ if (t == orig_t)
+ t = copy_node (t);
TREE_OPERAND (t, 0) = TREE_OPERAND (prev, 1);
/* First do the assignment, then return converted constant. */
t = build (COMPOUND_EXPR, TREE_TYPE (t), prev, fold (t));
{
tree uns = (*lang_hooks.types.unsigned_type) (TREE_TYPE (and0));
and0 = convert (uns, and0);
- and1 = convert (uns, and1);
+ and1 = convert (uns, and1);
}
#endif
}
if (!wins)
{
- TREE_CONSTANT (t) = TREE_CONSTANT (arg0);
+ if (TREE_CONSTANT (t) != TREE_CONSTANT (arg0))
+ {
+ if (t == orig_t)
+ t = copy_node (t);
+ TREE_CONSTANT (t) = TREE_CONSTANT (arg0);
+ }
return t;
}
return fold_convert (t, arg0);
return t;
case COMPONENT_REF:
- if (TREE_CODE (arg0) == CONSTRUCTOR)
+ if (TREE_CODE (arg0) == CONSTRUCTOR
+ && ! type_contains_placeholder_p (TREE_TYPE (arg0)))
{
tree m = purpose_member (arg1, CONSTRUCTOR_ELTS (arg0));
if (m)
return t;
case RANGE_EXPR:
- TREE_CONSTANT (t) = wins;
+ if (TREE_CONSTANT (t) != wins)
+ {
+ if (t == orig_t)
+ t = copy_node (t);
+ TREE_CONSTANT (t) = wins;
+ }
return t;
case NEGATE_EXPR:
}
else if (TREE_CODE (arg0) == NEGATE_EXPR)
return TREE_OPERAND (arg0, 0);
+ /* Convert -((double)float) into (double)(-float). */
+ else if (TREE_CODE (arg0) == NOP_EXPR
+ && TREE_CODE (type) == REAL_TYPE)
+ {
+ tree targ0 = strip_float_extensions (arg0);
+ if (targ0 != arg0)
+ return convert (type, build1 (NEGATE_EXPR, TREE_TYPE (targ0), targ0));
+
+ }
/* Convert - (a - b) to (b - a) for non-floating-point. */
else if (TREE_CODE (arg0) == MINUS_EXPR
return build (MINUS_EXPR, type, TREE_OPERAND (arg0, 1),
TREE_OPERAND (arg0, 0));
- return t;
+ /* Convert -f(x) into f(-x) where f is sin, tan or atan. */
+ switch (builtin_mathfn_code (arg0))
+ {
+ case BUILT_IN_SIN:
+ case BUILT_IN_SINF:
+ case BUILT_IN_SINL:
+ case BUILT_IN_TAN:
+ case BUILT_IN_TANF:
+ case BUILT_IN_TANL:
+ case BUILT_IN_ATAN:
+ case BUILT_IN_ATANF:
+ case BUILT_IN_ATANL:
+ if (negate_expr_p (TREE_VALUE (TREE_OPERAND (arg0, 1))))
+ {
+ tree fndecl, arg, arglist;
+
+ fndecl = get_callee_fndecl (arg0);
+ arg = TREE_VALUE (TREE_OPERAND (arg0, 1));
+ arg = fold (build1 (NEGATE_EXPR, type, arg));
+ arglist = build_tree_list (NULL_TREE, arg);
+ return build_function_call_expr (fndecl, arglist);
+ }
+ break;
+
+ default:
+ break;
+ }
+ return t;
case ABS_EXPR:
if (wins)
REAL_VALUE_NEGATE (TREE_REAL_CST (arg0)));
}
}
- else if (TREE_CODE (arg0) == ABS_EXPR || TREE_CODE (arg0) == NEGATE_EXPR)
- return build1 (ABS_EXPR, type, TREE_OPERAND (arg0, 0));
- else
+ else if (TREE_CODE (arg0) == NEGATE_EXPR)
+ return fold (build1 (ABS_EXPR, type, TREE_OPERAND (arg0, 0)));
+ /* Convert fabs((double)float) into (double)fabsf(float). */
+ else if (TREE_CODE (arg0) == NOP_EXPR
+ && TREE_CODE (type) == REAL_TYPE)
{
- /* fabs(sqrt(x)) = sqrt(x) and fabs(exp(x)) = exp(x). */
- enum built_in_function fcode = builtin_mathfn_code (arg0);
- if (fcode == BUILT_IN_SQRT
- || fcode == BUILT_IN_SQRTF
- || fcode == BUILT_IN_SQRTL
- || fcode == BUILT_IN_EXP
- || fcode == BUILT_IN_EXPF
- || fcode == BUILT_IN_EXPL)
- t = arg0;
+ tree targ0 = strip_float_extensions (arg0);
+ if (targ0 != arg0)
+ return convert (type, fold (build1 (ABS_EXPR, TREE_TYPE (targ0),
+ targ0)));
}
+ else if (tree_expr_nonnegative_p (arg0))
+ return arg0;
return t;
case CONJ_EXPR:
if (TREE_CODE (parg0) == MULT_EXPR
&& TREE_CODE (parg1) != MULT_EXPR)
return fold (build (PLUS_EXPR, type,
- fold (build (PLUS_EXPR, type, parg0, marg)),
- parg1));
+ fold (build (PLUS_EXPR, type,
+ convert (type, parg0),
+ convert (type, marg))),
+ convert (type, parg1)));
if (TREE_CODE (parg0) != MULT_EXPR
&& TREE_CODE (parg1) == MULT_EXPR)
return fold (build (PLUS_EXPR, type,
- fold (build (PLUS_EXPR, type, parg1, marg)),
- parg0));
+ fold (build (PLUS_EXPR, type,
+ convert (type, parg1),
+ convert (type, marg))),
+ convert (type, parg0)));
}
if (TREE_CODE (arg0) == MULT_EXPR && TREE_CODE (arg1) == MULT_EXPR)
same));
}
}
+ else
+ {
+ /* See if ARG1 is zero and X + ARG1 reduces to X. */
+ if (fold_real_zero_addition_p (TREE_TYPE (arg0), arg1, 0))
+ return non_lvalue (convert (type, arg0));
- /* See if ARG1 is zero and X + ARG1 reduces to X. */
- else if (fold_real_zero_addition_p (TREE_TYPE (arg0), arg1, 0))
- return non_lvalue (convert (type, arg0));
+ /* Likewise if the operands are reversed. */
+ if (fold_real_zero_addition_p (TREE_TYPE (arg1), arg0, 0))
+ return non_lvalue (convert (type, arg1));
- /* Likewise if the operands are reversed. */
- else if (fold_real_zero_addition_p (TREE_TYPE (arg1), arg0, 0))
- return non_lvalue (convert (type, arg1));
+ /* Convert x+x into x*2.0. */
+ if (operand_equal_p (arg0, arg1, 0)
+ && SCALAR_FLOAT_TYPE_P (type))
+ return fold (build (MULT_EXPR, type, arg0,
+ build_real (type, dconst2)));
+
+ /* Convert x*c+x into x*(c+1). */
+ if (flag_unsafe_math_optimizations
+ && TREE_CODE (arg0) == MULT_EXPR
+ && TREE_CODE (TREE_OPERAND (arg0, 1)) == REAL_CST
+ && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg0, 1))
+ && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0))
+ {
+ REAL_VALUE_TYPE c;
+
+ c = TREE_REAL_CST (TREE_OPERAND (arg0, 1));
+ real_arithmetic (&c, PLUS_EXPR, &c, &dconst1);
+ return fold (build (MULT_EXPR, type, arg1,
+ build_real (type, c)));
+ }
+
+ /* Convert x+x*c into x*(c+1). */
+ if (flag_unsafe_math_optimizations
+ && TREE_CODE (arg1) == MULT_EXPR
+ && TREE_CODE (TREE_OPERAND (arg1, 1)) == REAL_CST
+ && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg1, 1))
+ && operand_equal_p (TREE_OPERAND (arg1, 0), arg0, 0))
+ {
+ REAL_VALUE_TYPE c;
+
+ c = TREE_REAL_CST (TREE_OPERAND (arg1, 1));
+ real_arithmetic (&c, PLUS_EXPR, &c, &dconst1);
+ return fold (build (MULT_EXPR, type, arg0,
+ build_real (type, c)));
+ }
+
+ /* Convert x*c1+x*c2 into x*(c1+c2). */
+ if (flag_unsafe_math_optimizations
+ && TREE_CODE (arg0) == MULT_EXPR
+ && TREE_CODE (arg1) == MULT_EXPR
+ && TREE_CODE (TREE_OPERAND (arg0, 1)) == REAL_CST
+ && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg0, 1))
+ && TREE_CODE (TREE_OPERAND (arg1, 1)) == REAL_CST
+ && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg1, 1))
+ && operand_equal_p (TREE_OPERAND (arg0, 0),
+ TREE_OPERAND (arg1, 0), 0))
+ {
+ REAL_VALUE_TYPE c1, c2;
+
+ c1 = TREE_REAL_CST (TREE_OPERAND (arg0, 1));
+ c2 = TREE_REAL_CST (TREE_OPERAND (arg1, 1));
+ real_arithmetic (&c1, PLUS_EXPR, &c1, &c2);
+ return fold (build (MULT_EXPR, type,
+ TREE_OPERAND (arg0, 0),
+ build_real (type, c1)));
+ }
+ }
bit_rotate:
/* (A << C1) + (A >> C2) if A is unsigned and C1+C2 is the size of A
associate:
/* In most languages, can't associate operations on floats through
parentheses. Rather than remember where the parentheses were, we
- don't associate floats at all. It shouldn't matter much. However,
- associating multiplications is only very slightly inaccurate, so do
- that if -funsafe-math-optimizations is specified. */
+ don't associate floats at all, unless the user has specified
+ -funsafe-math-optimizations. */
if (! wins
- && (! FLOAT_TYPE_P (type)
- || (flag_unsafe_math_optimizations && code == MULT_EXPR)))
+ && (! FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations))
{
tree var0, con0, lit0, minus_lit0;
tree var1, con1, lit1, minus_lit1;
/* Preserve the MINUS_EXPR if the negative part of the literal is
greater than the positive part. Otherwise, the multiplicative
folding code (i.e extract_muldiv) may be fooled in case
- unsigned constants are substracted, like in the following
+ unsigned constants are subtracted, like in the following
example: ((X*2 + 4) - 8U)/2. */
if (minus_lit0 && lit0)
{
- if (tree_int_cst_lt (lit0, minus_lit0))
+ if (TREE_CODE (lit0) == INTEGER_CST
+ && TREE_CODE (minus_lit0) == INTEGER_CST
+ && tree_int_cst_lt (lit0, minus_lit0))
{
minus_lit0 = associate_trees (minus_lit0, lit0,
MINUS_EXPR, type);
/* A - (-B) -> A + B */
if (TREE_CODE (arg1) == NEGATE_EXPR)
return fold (build (PLUS_EXPR, type, arg0, TREE_OPERAND (arg1, 0)));
- /* (-A) - CST -> (-CST) - A for floating point (what about ints ?) */
- if (TREE_CODE (arg0) == NEGATE_EXPR && TREE_CODE (arg1) == REAL_CST)
- return
- fold (build (MINUS_EXPR, type,
- build_real (TREE_TYPE (arg1),
- REAL_VALUE_NEGATE (TREE_REAL_CST (arg1))),
- TREE_OPERAND (arg0, 0)));
+ /* (-A) - B -> (-B) - A where B is easily negated and we can swap. */
+ if (TREE_CODE (arg0) == NEGATE_EXPR
+ && (FLOAT_TYPE_P (type)
+ || (INTEGRAL_TYPE_P (type) && flag_wrapv && !flag_trapv))
+ && negate_expr_p (arg1)
+ && (! TREE_SIDE_EFFECTS (arg0) || TREE_CONSTANT (arg1))
+ && (! TREE_SIDE_EFFECTS (arg1) || TREE_CONSTANT (arg0)))
+ return fold (build (MINUS_EXPR, type, negate_expr (arg1),
+ TREE_OPERAND (arg0, 0)));
if (! FLOAT_TYPE_P (type))
{
TREE_OPERAND (arg0, 0),
TREE_OPERAND (arg1, 0))),
TREE_OPERAND (arg0, 1)));
+
+ /* Fold A - (A & B) into ~B & A. */
+ if (!TREE_SIDE_EFFECTS (arg0)
+ && TREE_CODE (arg1) == BIT_AND_EXPR)
+ {
+ if (operand_equal_p (arg0, TREE_OPERAND (arg1, 1), 0))
+ return fold (build (BIT_AND_EXPR, type,
+ fold (build1 (BIT_NOT_EXPR, type,
+ TREE_OPERAND (arg1, 0))),
+ arg0));
+ if (operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0))
+ return fold (build (BIT_AND_EXPR, type,
+ fold (build1 (BIT_NOT_EXPR, type,
+ TREE_OPERAND (arg1, 1))),
+ arg0));
+ }
+
+ /* Fold (A & ~B) - (A & B) into (A ^ B) - B, where B is
+ any power of 2 minus 1. */
+ if (TREE_CODE (arg0) == BIT_AND_EXPR
+ && TREE_CODE (arg1) == BIT_AND_EXPR
+ && operand_equal_p (TREE_OPERAND (arg0, 0),
+ TREE_OPERAND (arg1, 0), 0)
+ && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST
+ && TREE_CODE (TREE_OPERAND (arg1, 1)) == INTEGER_CST)
+ {
+ tree mask0 = TREE_OPERAND (arg0, 1);
+ tree mask1 = TREE_OPERAND (arg1, 1);
+ tree tem = fold (build1 (BIT_NOT_EXPR, type, mask0));
+
+ if (operand_equal_p (tem, mask1, 0)
+ && integer_pow2p (fold (build (PLUS_EXPR, type,
+ mask1, integer_one_node))))
+ {
+ tem = fold (build (BIT_XOR_EXPR, type,
+ TREE_OPERAND (arg0, 0), mask1));
+ return fold (build (MINUS_EXPR, type, tem, mask1));
+ }
+ }
}
/* See if ARG1 is zero and X - ARG1 reduces to X. */
case MULT_EXPR:
/* (-A) * (-B) -> A * B */
- if (TREE_CODE (arg0) == NEGATE_EXPR && TREE_CODE (arg1) == NEGATE_EXPR)
- return fold (build (MULT_EXPR, type, TREE_OPERAND (arg0, 0),
+ if (TREE_CODE (arg0) == NEGATE_EXPR && negate_expr_p (arg1))
+ return fold (build (MULT_EXPR, type,
+ TREE_OPERAND (arg0, 0),
+ negate_expr (arg1)));
+ if (TREE_CODE (arg1) == NEGATE_EXPR && negate_expr_p (arg0))
+ return fold (build (MULT_EXPR, type,
+ negate_expr (arg0),
TREE_OPERAND (arg1, 0)));
if (! FLOAT_TYPE_P (type))
TREE_OPERAND (arg0, 1)));
if (TREE_CODE (arg1) == INTEGER_CST
- && 0 != (tem = extract_muldiv (TREE_OPERAND (t, 0), arg1,
+ && 0 != (tem = extract_muldiv (TREE_OPERAND (t, 0),
+ convert (type, arg1),
code, NULL_TREE)))
return convert (type, tem);
&& real_minus_onep (arg1))
return fold (build1 (NEGATE_EXPR, type, arg0));
- /* x*2 is x+x */
- if (! wins && real_twop (arg1)
- && (*lang_hooks.decls.global_bindings_p) () == 0
- && ! contains_placeholder_p (arg0))
+ /* Convert (C1/X)*C2 into (C1*C2)/X. */
+ if (flag_unsafe_math_optimizations
+ && TREE_CODE (arg0) == RDIV_EXPR
+ && TREE_CODE (arg1) == REAL_CST
+ && TREE_CODE (TREE_OPERAND (arg0, 0)) == REAL_CST)
{
- tree arg = save_expr (arg0);
- return build (PLUS_EXPR, type, arg, arg);
+ tree tem = const_binop (MULT_EXPR, TREE_OPERAND (arg0, 0),
+ arg1, 0);
+ if (tem)
+ return fold (build (RDIV_EXPR, type, tem,
+ TREE_OPERAND (arg0, 1)));
}
if (flag_unsafe_math_optimizations)
enum built_in_function fcode0 = builtin_mathfn_code (arg0);
enum built_in_function fcode1 = builtin_mathfn_code (arg1);
- /* Optimize sqrt(x)*sqrt(y) as sqrt(x*y). */
+ /* Optimizations of sqrt(...)*sqrt(...). */
if ((fcode0 == BUILT_IN_SQRT && fcode1 == BUILT_IN_SQRT)
|| (fcode0 == BUILT_IN_SQRTF && fcode1 == BUILT_IN_SQRTF)
|| (fcode0 == BUILT_IN_SQRTL && fcode1 == BUILT_IN_SQRTL))
{
- tree sqrtfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
- tree arg = build (MULT_EXPR, type,
- TREE_VALUE (TREE_OPERAND (arg0, 1)),
- TREE_VALUE (TREE_OPERAND (arg1, 1)));
- tree arglist = build_tree_list (NULL_TREE, arg);
- return fold (build_function_call_expr (sqrtfn, arglist));
+ tree sqrtfn, arg, arglist;
+ tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1));
+ tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1));
+
+ /* Optimize sqrt(x)*sqrt(x) as x. */
+ if (operand_equal_p (arg00, arg10, 0)
+ && ! HONOR_SNANS (TYPE_MODE (type)))
+ return arg00;
+
+ /* Optimize sqrt(x)*sqrt(y) as sqrt(x*y). */
+ sqrtfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
+ arg = fold (build (MULT_EXPR, type, arg00, arg10));
+ arglist = build_tree_list (NULL_TREE, arg);
+ return build_function_call_expr (sqrtfn, arglist);
}
- /* Optimize exp(x)*exp(y) as exp(x+y). */
- if ((fcode0 == BUILT_IN_EXP && fcode1 == BUILT_IN_EXP)
- || (fcode0 == BUILT_IN_EXPF && fcode1 == BUILT_IN_EXPF)
- || (fcode0 == BUILT_IN_EXPL && fcode1 == BUILT_IN_EXPL))
+ /* Optimize expN(x)*expN(y) as expN(x+y). */
+ if (fcode0 == fcode1
+ && (fcode0 == BUILT_IN_EXP
+ || fcode0 == BUILT_IN_EXPF
+ || fcode0 == BUILT_IN_EXPL
+ || fcode0 == BUILT_IN_EXP2
+ || fcode0 == BUILT_IN_EXP2F
+ || fcode0 == BUILT_IN_EXP2L
+ || fcode0 == BUILT_IN_EXP10
+ || fcode0 == BUILT_IN_EXP10F
+ || fcode0 == BUILT_IN_EXP10L
+ || fcode0 == BUILT_IN_POW10
+ || fcode0 == BUILT_IN_POW10F
+ || fcode0 == BUILT_IN_POW10L))
{
tree expfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
tree arg = build (PLUS_EXPR, type,
TREE_VALUE (TREE_OPERAND (arg0, 1)),
TREE_VALUE (TREE_OPERAND (arg1, 1)));
- tree arglist = build_tree_list (NULL_TREE, arg);
- return fold (build_function_call_expr (expfn, arglist));
+ tree arglist = build_tree_list (NULL_TREE, fold (arg));
+ return build_function_call_expr (expfn, arglist);
+ }
+
+ /* Optimizations of pow(...)*pow(...). */
+ if ((fcode0 == BUILT_IN_POW && fcode1 == BUILT_IN_POW)
+ || (fcode0 == BUILT_IN_POWF && fcode1 == BUILT_IN_POWF)
+ || (fcode0 == BUILT_IN_POWL && fcode1 == BUILT_IN_POWL))
+ {
+ tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1));
+ tree arg01 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg0,
+ 1)));
+ tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1));
+ tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1,
+ 1)));
+
+ /* Optimize pow(x,y)*pow(z,y) as pow(x*z,y). */
+ if (operand_equal_p (arg01, arg11, 0))
+ {
+ tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
+ tree arg = build (MULT_EXPR, type, arg00, arg10);
+ tree arglist = tree_cons (NULL_TREE, fold (arg),
+ build_tree_list (NULL_TREE,
+ arg01));
+ return build_function_call_expr (powfn, arglist);
+ }
+
+ /* Optimize pow(x,y)*pow(x,z) as pow(x,y+z). */
+ if (operand_equal_p (arg00, arg10, 0))
+ {
+ tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
+ tree arg = fold (build (PLUS_EXPR, type, arg01, arg11));
+ tree arglist = tree_cons (NULL_TREE, arg00,
+ build_tree_list (NULL_TREE,
+ arg));
+ return build_function_call_expr (powfn, arglist);
+ }
+ }
+
+ /* Optimize tan(x)*cos(x) as sin(x). */
+ if (((fcode0 == BUILT_IN_TAN && fcode1 == BUILT_IN_COS)
+ || (fcode0 == BUILT_IN_TANF && fcode1 == BUILT_IN_COSF)
+ || (fcode0 == BUILT_IN_TANL && fcode1 == BUILT_IN_COSL)
+ || (fcode0 == BUILT_IN_COS && fcode1 == BUILT_IN_TAN)
+ || (fcode0 == BUILT_IN_COSF && fcode1 == BUILT_IN_TANF)
+ || (fcode0 == BUILT_IN_COSL && fcode1 == BUILT_IN_TANL))
+ && operand_equal_p (TREE_VALUE (TREE_OPERAND (arg0, 1)),
+ TREE_VALUE (TREE_OPERAND (arg1, 1)), 0))
+ {
+ tree sinfn;
+
+ switch (fcode0)
+ {
+ case BUILT_IN_TAN:
+ case BUILT_IN_COS:
+ sinfn = implicit_built_in_decls[BUILT_IN_SIN];
+ break;
+ case BUILT_IN_TANF:
+ case BUILT_IN_COSF:
+ sinfn = implicit_built_in_decls[BUILT_IN_SINF];
+ break;
+ case BUILT_IN_TANL:
+ case BUILT_IN_COSL:
+ sinfn = implicit_built_in_decls[BUILT_IN_SINL];
+ break;
+ default:
+ sinfn = NULL_TREE;
+ }
+
+ if (sinfn != NULL_TREE)
+ return build_function_call_expr (sinfn,
+ TREE_OPERAND (arg0, 1));
+ }
+
+ /* Optimize x*pow(x,c) as pow(x,c+1). */
+ if (fcode1 == BUILT_IN_POW
+ || fcode1 == BUILT_IN_POWF
+ || fcode1 == BUILT_IN_POWL)
+ {
+ tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1));
+ tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1,
+ 1)));
+ if (TREE_CODE (arg11) == REAL_CST
+ && ! TREE_CONSTANT_OVERFLOW (arg11)
+ && operand_equal_p (arg0, arg10, 0))
+ {
+ tree powfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0);
+ REAL_VALUE_TYPE c;
+ tree arg, arglist;
+
+ c = TREE_REAL_CST (arg11);
+ real_arithmetic (&c, PLUS_EXPR, &c, &dconst1);
+ arg = build_real (type, c);
+ arglist = build_tree_list (NULL_TREE, arg);
+ arglist = tree_cons (NULL_TREE, arg0, arglist);
+ return build_function_call_expr (powfn, arglist);
+ }
+ }
+
+ /* Optimize pow(x,c)*x as pow(x,c+1). */
+ if (fcode0 == BUILT_IN_POW
+ || fcode0 == BUILT_IN_POWF
+ || fcode0 == BUILT_IN_POWL)
+ {
+ tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1));
+ tree arg01 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg0,
+ 1)));
+ if (TREE_CODE (arg01) == REAL_CST
+ && ! TREE_CONSTANT_OVERFLOW (arg01)
+ && operand_equal_p (arg1, arg00, 0))
+ {
+ tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
+ REAL_VALUE_TYPE c;
+ tree arg, arglist;
+
+ c = TREE_REAL_CST (arg01);
+ real_arithmetic (&c, PLUS_EXPR, &c, &dconst1);
+ arg = build_real (type, c);
+ arglist = build_tree_list (NULL_TREE, arg);
+ arglist = tree_cons (NULL_TREE, arg1, arglist);
+ return build_function_call_expr (powfn, arglist);
+ }
+ }
+
+ /* Optimize x*x as pow(x,2.0), which is expanded as x*x. */
+ if (! optimize_size
+ && operand_equal_p (arg0, arg1, 0))
+ {
+ tree powfn;
+
+ if (type == double_type_node)
+ powfn = implicit_built_in_decls[BUILT_IN_POW];
+ else if (type == float_type_node)
+ powfn = implicit_built_in_decls[BUILT_IN_POWF];
+ else if (type == long_double_type_node)
+ powfn = implicit_built_in_decls[BUILT_IN_POWL];
+ else
+ powfn = NULL_TREE;
+
+ if (powfn)
+ {
+ tree arg = build_real (type, dconst2);
+ tree arglist = build_tree_list (NULL_TREE, arg);
+ arglist = tree_cons (NULL_TREE, arg0, arglist);
+ return build_function_call_expr (powfn, arglist);
+ }
}
}
}
goto bit_rotate;
case BIT_AND_EXPR:
- bit_and:
if (integer_all_onesp (arg1))
return non_lvalue (convert (type, arg0));
if (integer_zerop (arg1))
t1 = distribute_bit_expr (code, type, arg0, arg1);
if (t1 != NULL_TREE)
return t1;
- /* Simplify ((int)c & 0x377) into (int)c, if c is unsigned char. */
+ /* Simplify ((int)c & 0377) into (int)c, if c is unsigned char. */
if (TREE_CODE (arg1) == INTEGER_CST && TREE_CODE (arg0) == NOP_EXPR
&& TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg0, 0))))
{
goto associate;
- case BIT_ANDTC_EXPR:
- if (integer_all_onesp (arg0))
- return non_lvalue (convert (type, arg1));
- if (integer_zerop (arg0))
- return omit_one_operand (type, arg0, arg1);
- if (TREE_CODE (arg1) == INTEGER_CST)
- {
- arg1 = fold (build1 (BIT_NOT_EXPR, type, arg1));
- code = BIT_AND_EXPR;
- goto bit_and;
- }
- goto binary;
-
case RDIV_EXPR:
/* Don't touch a floating-point divide by zero unless the mode
of the constant can represent infinity. */
return t;
/* (-A) / (-B) -> A / B */
- if (TREE_CODE (arg0) == NEGATE_EXPR && TREE_CODE (arg1) == NEGATE_EXPR)
- return fold (build (RDIV_EXPR, type, TREE_OPERAND (arg0, 0),
+ if (TREE_CODE (arg0) == NEGATE_EXPR && negate_expr_p (arg1))
+ return fold (build (RDIV_EXPR, type,
+ TREE_OPERAND (arg0, 0),
+ negate_expr (arg1)));
+ if (TREE_CODE (arg1) == NEGATE_EXPR && negate_expr_p (arg0))
+ return fold (build (RDIV_EXPR, type,
+ negate_expr (arg0),
TREE_OPERAND (arg1, 0)));
/* In IEEE floating point, x/1 is not equivalent to x for snans. */
&& real_onep (arg1))
return non_lvalue (convert (type, arg0));
+ /* In IEEE floating point, x/-1 is not equivalent to -x for snans. */
+ if (!HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0)))
+ && real_minus_onep (arg1))
+ return non_lvalue (convert (type, negate_expr (arg0)));
+
/* If ARG1 is a constant, we can convert this to a multiply by the
reciprocal. This does not have the same rounding properties,
so only do this if -funsafe-math-optimizations. We can actually
arg1, 0)))
return fold (build (MULT_EXPR, type, arg0, tem));
/* Find the reciprocal if optimizing and the result is exact. */
- else if (optimize)
+ if (optimize)
{
REAL_VALUE_TYPE r;
r = TREE_REAL_CST (arg1);
/* Convert A/B/C to A/(B*C). */
if (flag_unsafe_math_optimizations
&& TREE_CODE (arg0) == RDIV_EXPR)
- {
- return fold (build (RDIV_EXPR, type, TREE_OPERAND (arg0, 0),
- build (MULT_EXPR, type, TREE_OPERAND (arg0, 1),
- arg1)));
- }
+ return fold (build (RDIV_EXPR, type, TREE_OPERAND (arg0, 0),
+ fold (build (MULT_EXPR, type,
+ TREE_OPERAND (arg0, 1), arg1))));
+
/* Convert A/(B/C) to (A/B)*C. */
if (flag_unsafe_math_optimizations
&& TREE_CODE (arg1) == RDIV_EXPR)
+ return fold (build (MULT_EXPR, type,
+ fold (build (RDIV_EXPR, type, arg0,
+ TREE_OPERAND (arg1, 0))),
+ TREE_OPERAND (arg1, 1)));
+
+ /* Convert C1/(X*C2) into (C1/C2)/X. */
+ if (flag_unsafe_math_optimizations
+ && TREE_CODE (arg1) == MULT_EXPR
+ && TREE_CODE (arg0) == REAL_CST
+ && TREE_CODE (TREE_OPERAND (arg1, 1)) == REAL_CST)
{
- return fold (build (MULT_EXPR, type,
- build (RDIV_EXPR, type, arg0,
- TREE_OPERAND (arg1, 0)),
- TREE_OPERAND (arg1, 1)));
+ tree tem = const_binop (RDIV_EXPR, arg0,
+ TREE_OPERAND (arg1, 1), 0);
+ if (tem)
+ return fold (build (RDIV_EXPR, type, tem,
+ TREE_OPERAND (arg1, 0)));
}
- /* Optimize x/exp(y) into x*exp(-y). */
if (flag_unsafe_math_optimizations)
{
enum built_in_function fcode = builtin_mathfn_code (arg1);
+ /* Optimize x/expN(y) into x*expN(-y). */
if (fcode == BUILT_IN_EXP
|| fcode == BUILT_IN_EXPF
- || fcode == BUILT_IN_EXPL)
+ || fcode == BUILT_IN_EXPL
+ || fcode == BUILT_IN_EXP2
+ || fcode == BUILT_IN_EXP2F
+ || fcode == BUILT_IN_EXP2L
+ || fcode == BUILT_IN_EXP10
+ || fcode == BUILT_IN_EXP10F
+ || fcode == BUILT_IN_EXP10L
+ || fcode == BUILT_IN_POW10
+ || fcode == BUILT_IN_POW10F
+ || fcode == BUILT_IN_POW10L)
{
tree expfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0);
tree arg = build1 (NEGATE_EXPR, type,
TREE_VALUE (TREE_OPERAND (arg1, 1)));
- tree arglist = build_tree_list (NULL_TREE, arg);
+ tree arglist = build_tree_list (NULL_TREE, fold (arg));
arg1 = build_function_call_expr (expfn, arglist);
return fold (build (MULT_EXPR, type, arg0, arg1));
}
+
+ /* Optimize x/pow(y,z) into x*pow(y,-z). */
+ if (fcode == BUILT_IN_POW
+ || fcode == BUILT_IN_POWF
+ || fcode == BUILT_IN_POWL)
+ {
+ tree powfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0);
+ tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1));
+ tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1, 1)));
+ tree neg11 = fold (build1 (NEGATE_EXPR, type, arg11));
+ tree arglist = tree_cons(NULL_TREE, arg10,
+ build_tree_list (NULL_TREE, neg11));
+ arg1 = build_function_call_expr (powfn, arglist);
+ return fold (build (MULT_EXPR, type, arg0, arg1));
+ }
+ }
+
+ if (flag_unsafe_math_optimizations)
+ {
+ enum built_in_function fcode0 = builtin_mathfn_code (arg0);
+ enum built_in_function fcode1 = builtin_mathfn_code (arg1);
+
+ /* Optimize sin(x)/cos(x) as tan(x). */
+ if (((fcode0 == BUILT_IN_SIN && fcode1 == BUILT_IN_COS)
+ || (fcode0 == BUILT_IN_SINF && fcode1 == BUILT_IN_COSF)
+ || (fcode0 == BUILT_IN_SINL && fcode1 == BUILT_IN_COSL))
+ && operand_equal_p (TREE_VALUE (TREE_OPERAND (arg0, 1)),
+ TREE_VALUE (TREE_OPERAND (arg1, 1)), 0))
+ {
+ tree tanfn;
+
+ if (fcode0 == BUILT_IN_SIN)
+ tanfn = implicit_built_in_decls[BUILT_IN_TAN];
+ else if (fcode0 == BUILT_IN_SINF)
+ tanfn = implicit_built_in_decls[BUILT_IN_TANF];
+ else if (fcode0 == BUILT_IN_SINL)
+ tanfn = implicit_built_in_decls[BUILT_IN_TANL];
+ else
+ tanfn = NULL_TREE;
+
+ if (tanfn != NULL_TREE)
+ return build_function_call_expr (tanfn,
+ TREE_OPERAND (arg0, 1));
+ }
+
+ /* Optimize cos(x)/sin(x) as 1.0/tan(x). */
+ if (((fcode0 == BUILT_IN_COS && fcode1 == BUILT_IN_SIN)
+ || (fcode0 == BUILT_IN_COSF && fcode1 == BUILT_IN_SINF)
+ || (fcode0 == BUILT_IN_COSL && fcode1 == BUILT_IN_SINL))
+ && operand_equal_p (TREE_VALUE (TREE_OPERAND (arg0, 1)),
+ TREE_VALUE (TREE_OPERAND (arg1, 1)), 0))
+ {
+ tree tanfn;
+
+ if (fcode0 == BUILT_IN_COS)
+ tanfn = implicit_built_in_decls[BUILT_IN_TAN];
+ else if (fcode0 == BUILT_IN_COSF)
+ tanfn = implicit_built_in_decls[BUILT_IN_TANF];
+ else if (fcode0 == BUILT_IN_COSL)
+ tanfn = implicit_built_in_decls[BUILT_IN_TANL];
+ else
+ tanfn = NULL_TREE;
+
+ if (tanfn != NULL_TREE)
+ {
+ tree tmp = TREE_OPERAND (arg0, 1);
+ tmp = build_function_call_expr (tanfn, tmp);
+ return fold (build (RDIV_EXPR, type,
+ build_real (type, dconst1),
+ tmp));
+ }
+ }
+
+ /* Optimize pow(x,c)/x as pow(x,c-1). */
+ if (fcode0 == BUILT_IN_POW
+ || fcode0 == BUILT_IN_POWF
+ || fcode0 == BUILT_IN_POWL)
+ {
+ tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1));
+ tree arg01 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg0, 1)));
+ if (TREE_CODE (arg01) == REAL_CST
+ && ! TREE_CONSTANT_OVERFLOW (arg01)
+ && operand_equal_p (arg1, arg00, 0))
+ {
+ tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
+ REAL_VALUE_TYPE c;
+ tree arg, arglist;
+
+ c = TREE_REAL_CST (arg01);
+ real_arithmetic (&c, MINUS_EXPR, &c, &dconst1);
+ arg = build_real (type, c);
+ arglist = build_tree_list (NULL_TREE, arg);
+ arglist = tree_cons (NULL_TREE, arg1, arglist);
+ return build_function_call_expr (powfn, arglist);
+ }
+ }
}
goto binary;
RROTATE_EXPR by a new constant. */
if (code == LROTATE_EXPR && TREE_CODE (arg1) == INTEGER_CST)
{
- TREE_SET_CODE (t, RROTATE_EXPR);
- code = RROTATE_EXPR;
- TREE_OPERAND (t, 1) = arg1
- = const_binop
- (MINUS_EXPR,
- convert (TREE_TYPE (arg1),
- build_int_2 (GET_MODE_BITSIZE (TYPE_MODE (type)), 0)),
- arg1, 0);
- if (tree_int_cst_sgn (arg1) < 0)
- return t;
+ tree tem = build_int_2 (GET_MODE_BITSIZE (TYPE_MODE (type)), 0);
+ tem = convert (TREE_TYPE (arg1), tem);
+ tem = const_binop (MINUS_EXPR, tem, arg1, 0);
+ return fold (build (RROTATE_EXPR, type, arg0, tem));
}
/* If we have a rotate of a bit operation with the rotate count and
permute the two operations. */
if (code == RROTATE_EXPR && TREE_CODE (arg1) == INTEGER_CST
&& (TREE_CODE (arg0) == BIT_AND_EXPR
- || TREE_CODE (arg0) == BIT_ANDTC_EXPR
|| TREE_CODE (arg0) == BIT_IOR_EXPR
|| TREE_CODE (arg0) == BIT_XOR_EXPR)
&& TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST)
tem = invert_truthvalue (arg0);
/* Avoid infinite recursion. */
if (TREE_CODE (tem) == TRUTH_NOT_EXPR)
- return t;
+ {
+ tem = fold_single_bit_test (code, arg0, arg1, type);
+ if (tem)
+ return tem;
+ return t;
+ }
return convert (type, tem);
case TRUTH_ANDIF_EXPR:
case LE_EXPR:
case GE_EXPR:
/* If one arg is a real or integer constant, put it last. */
- if ((TREE_CODE (arg0) == INTEGER_CST
- && TREE_CODE (arg1) != INTEGER_CST)
- || (TREE_CODE (arg0) == REAL_CST
- && TREE_CODE (arg0) != REAL_CST))
- {
- TREE_OPERAND (t, 0) = arg1;
- TREE_OPERAND (t, 1) = arg0;
- arg0 = TREE_OPERAND (t, 0);
- arg1 = TREE_OPERAND (t, 1);
- code = swap_tree_comparison (code);
- TREE_SET_CODE (t, code);
- }
+ if (tree_swap_operands_p (arg0, arg1))
+ return fold (build (swap_tree_comparison (code), type, arg1, arg0));
if (FLOAT_TYPE_P (TREE_TYPE (arg0)))
{
+ tree targ0 = strip_float_extensions (arg0);
+ tree targ1 = strip_float_extensions (arg1);
+ tree newtype = TREE_TYPE (targ0);
+
+ if (TYPE_PRECISION (TREE_TYPE (targ1)) > TYPE_PRECISION (newtype))
+ newtype = TREE_TYPE (targ1);
+
+ /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
+ if (TYPE_PRECISION (newtype) < TYPE_PRECISION (TREE_TYPE (arg0)))
+ return fold (build (code, type, convert (newtype, targ0),
+ convert (newtype, targ1)));
+
/* (-a) CMP (-b) -> b CMP a */
if (TREE_CODE (arg0) == NEGATE_EXPR
&& TREE_CODE (arg1) == NEGATE_EXPR)
return fold (build (code, type, TREE_OPERAND (arg1, 0),
TREE_OPERAND (arg0, 0)));
- /* (-a) CMP CST -> a swap(CMP) (-CST) */
- if (TREE_CODE (arg0) == NEGATE_EXPR && TREE_CODE (arg1) == REAL_CST)
- return
- fold (build
- (swap_tree_comparison (code), type,
- TREE_OPERAND (arg0, 0),
- build_real (TREE_TYPE (arg1),
- REAL_VALUE_NEGATE (TREE_REAL_CST (arg1)))));
- /* IEEE doesn't distinguish +0 and -0 in comparisons. */
- /* a CMP (-0) -> a CMP 0 */
- if (TREE_CODE (arg1) == REAL_CST
- && REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (arg1)))
- return fold (build (code, type, arg0,
- build_real (TREE_TYPE (arg1), dconst0)));
+
+ if (TREE_CODE (arg1) == REAL_CST)
+ {
+ REAL_VALUE_TYPE cst;
+ cst = TREE_REAL_CST (arg1);
+
+ /* (-a) CMP CST -> a swap(CMP) (-CST) */
+ if (TREE_CODE (arg0) == NEGATE_EXPR)
+ return
+ fold (build (swap_tree_comparison (code), type,
+ TREE_OPERAND (arg0, 0),
+ build_real (TREE_TYPE (arg1),
+ REAL_VALUE_NEGATE (cst))));
+
+ /* IEEE doesn't distinguish +0 and -0 in comparisons. */
+ /* a CMP (-0) -> a CMP 0 */
+ if (REAL_VALUE_MINUS_ZERO (cst))
+ return fold (build (code, type, arg0,
+ build_real (TREE_TYPE (arg1), dconst0)));
+
+ /* x != NaN is always true, other ops are always false. */
+ if (REAL_VALUE_ISNAN (cst)
+ && ! HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg1))))
+ {
+ t = (code == NE_EXPR) ? integer_one_node : integer_zero_node;
+ return omit_one_operand (type, convert (type, t), arg0);
+ }
+
+ /* Fold comparisons against infinity. */
+ if (REAL_VALUE_ISINF (cst))
+ {
+ tem = fold_inf_compare (code, type, arg0, arg1);
+ if (tem != NULL_TREE)
+ return tem;
+ }
+ }
/* If this is a comparison of a real constant with a PLUS_EXPR
or a MINUS_EXPR of a real constant, we can convert it into a
arg1, TREE_OPERAND (arg0, 1), 0))
&& ! TREE_CONSTANT_OVERFLOW (tem))
return fold (build (code, type, TREE_OPERAND (arg0, 0), tem));
+
+ /* Likewise, we can simplify a comparison of a real constant with
+ a MINUS_EXPR whose first operand is also a real constant, i.e.
+ (c1 - x) < c2 becomes x > c1-c2. */
+ if (flag_unsafe_math_optimizations
+ && TREE_CODE (arg1) == REAL_CST
+ && TREE_CODE (arg0) == MINUS_EXPR
+ && TREE_CODE (TREE_OPERAND (arg0, 0)) == REAL_CST
+ && 0 != (tem = const_binop (MINUS_EXPR, TREE_OPERAND (arg0, 0),
+ arg1, 0))
+ && ! TREE_CONSTANT_OVERFLOW (tem))
+ return fold (build (swap_tree_comparison (code), type,
+ TREE_OPERAND (arg0, 1), tem));
+
+ /* Fold comparisons against built-in math functions. */
+ if (TREE_CODE (arg1) == REAL_CST
+ && flag_unsafe_math_optimizations
+ && ! flag_errno_math)
+ {
+ enum built_in_function fcode = builtin_mathfn_code (arg0);
+
+ if (fcode != END_BUILTINS)
+ {
+ tem = fold_mathfn_compare (fcode, code, type, arg0, arg1);
+ if (tem != NULL_TREE)
+ return tem;
+ }
+ }
}
/* Convert foo++ == CONST into ++foo == CONST + INCR.
switch (code)
{
case GE_EXPR:
- code = GT_EXPR;
arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0);
- t = build (code, type, TREE_OPERAND (t, 0), arg1);
- break;
+ return fold (build (GT_EXPR, type, arg0, arg1));
case LT_EXPR:
- code = LE_EXPR;
arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0);
- t = build (code, type, TREE_OPERAND (t, 0), arg1);
- break;
+ return fold (build (LE_EXPR, type, arg0, arg1));
default:
break;
convert (type, integer_zero_node),
arg0);
case GE_EXPR:
- code = EQ_EXPR;
- TREE_SET_CODE (t, EQ_EXPR);
- break;
+ return fold (build (EQ_EXPR, type, arg0, arg1));
+
case LE_EXPR:
return omit_one_operand (type,
convert (type, integer_one_node),
arg0);
case LT_EXPR:
- code = NE_EXPR;
- TREE_SET_CODE (t, NE_EXPR);
- break;
+ return fold (build (NE_EXPR, type, arg0, arg1));
/* The GE_EXPR and LT_EXPR cases above are not normally
- reached because of previous transformations. */
+ reached because of previous transformations. */
default:
break;
switch (code)
{
case GT_EXPR:
- code = EQ_EXPR;
arg1 = const_binop (PLUS_EXPR, arg1, integer_one_node, 0);
- t = build (code, type, TREE_OPERAND (t, 0), arg1);
- break;
+ return fold (build (EQ_EXPR, type, arg0, arg1));
case LE_EXPR:
- code = NE_EXPR;
arg1 = const_binop (PLUS_EXPR, arg1, integer_one_node, 0);
- t = build (code, type, TREE_OPERAND (t, 0), arg1);
- break;
+ return fold (build (NE_EXPR, type, arg0, arg1));
default:
break;
}
convert (type, integer_zero_node),
arg0);
case LE_EXPR:
- code = EQ_EXPR;
- TREE_SET_CODE (t, EQ_EXPR);
- break;
+ return fold (build (EQ_EXPR, type, arg0, arg1));
case GE_EXPR:
return omit_one_operand (type,
convert (type, integer_one_node),
arg0);
case GT_EXPR:
- code = NE_EXPR;
- TREE_SET_CODE (t, NE_EXPR);
- break;
+ return fold (build (NE_EXPR, type, arg0, arg1));
default:
break;
switch (code)
{
case GE_EXPR:
- code = NE_EXPR;
arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0);
- t = build (code, type, TREE_OPERAND (t, 0), arg1);
- break;
+ return fold (build (NE_EXPR, type, arg0, arg1));
case LT_EXPR:
- code = EQ_EXPR;
arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0);
- t = build (code, type, TREE_OPERAND (t, 0), arg1);
- break;
+ return fold (build (EQ_EXPR, type, arg0, arg1));
default:
break;
}
return fold (build (code == EQ_EXPR ? NE_EXPR : EQ_EXPR, type,
arg0, integer_zero_node));
- /* If we have (A & C) != 0 where C is the sign bit of A, convert
- this into A < 0. Similarly for (A & C) == 0 into A >= 0. */
+ /* If we have (A & C) != 0 or (A & C) == 0 and C is a power of
+ 2, then fold the expression into shifts and logical operations. */
+ tem = fold_single_bit_test (code, arg0, arg1, type);
+ if (tem)
+ return tem;
+
+ /* If we have (A & C) == D where D & ~C != 0, convert this into 0.
+ Similarly for NE_EXPR. */
if ((code == EQ_EXPR || code == NE_EXPR)
&& TREE_CODE (arg0) == BIT_AND_EXPR
- && integer_zerop (arg1))
+ && TREE_CODE (arg1) == INTEGER_CST
+ && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST)
{
- tree arg00 = sign_bit_p (TREE_OPERAND (arg0, 0),
- TREE_OPERAND (arg0, 1));
- if (arg00 != NULL_TREE)
- {
- tree stype = (*lang_hooks.types.signed_type) (TREE_TYPE (arg00));
- return fold (build (code == EQ_EXPR ? GE_EXPR : LT_EXPR, type,
- convert (stype, arg00),
- convert (stype, integer_zero_node)));
- }
+ tree dandnotc
+ = fold (build (BIT_AND_EXPR, TREE_TYPE (arg0),
+ arg1, build1 (BIT_NOT_EXPR,
+ TREE_TYPE (TREE_OPERAND (arg0, 1)),
+ TREE_OPERAND (arg0, 1))));
+ tree rslt = code == EQ_EXPR ? integer_zero_node : integer_one_node;
+ if (integer_nonzerop (dandnotc))
+ return omit_one_operand (type, rslt, arg0);
+ }
+
+ /* If we have (A | C) == D where C & ~D != 0, convert this into 0.
+ Similarly for NE_EXPR. */
+ if ((code == EQ_EXPR || code == NE_EXPR)
+ && TREE_CODE (arg0) == BIT_IOR_EXPR
+ && TREE_CODE (arg1) == INTEGER_CST
+ && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST)
+ {
+ tree candnotd
+ = fold (build (BIT_AND_EXPR, TREE_TYPE (arg0),
+ TREE_OPERAND (arg0, 1),
+ build1 (BIT_NOT_EXPR, TREE_TYPE (arg1), arg1)));
+ tree rslt = code == EQ_EXPR ? integer_zero_node : integer_one_node;
+ if (integer_nonzerop (candnotd))
+ return omit_one_operand (type, rslt, arg0);
}
/* If X is unsigned, convert X < (1 << Y) into X >> Y == 0
switch (code)
{
case EQ_EXPR:
+ if (! FLOAT_TYPE_P (TREE_TYPE (arg0))
+ || ! HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0))))
+ return constant_boolean_node (1, type);
+ break;
+
case GE_EXPR:
case LE_EXPR:
- if (! FLOAT_TYPE_P (TREE_TYPE (arg0)))
+ if (! FLOAT_TYPE_P (TREE_TYPE (arg0))
+ || ! HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0))))
return constant_boolean_node (1, type);
- code = EQ_EXPR;
- TREE_SET_CODE (t, code);
- break;
+ return fold (build (EQ_EXPR, type, arg0, arg1));
case NE_EXPR:
- /* For NE, we can only do this simplification if integer. */
- if (FLOAT_TYPE_P (TREE_TYPE (arg0)))
+ /* For NE, we can only do this simplification if integer
+ or we don't honor IEEE floating point NaNs. */
+ if (FLOAT_TYPE_P (TREE_TYPE (arg0))
+ && HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0))))
break;
/* ... fall through ... */
case GT_EXPR:
/* Optimize comparisons of strlen vs zero to a compare of the
first character of the string vs zero. To wit,
- strlen(ptr) == 0 => *ptr == 0
+ strlen(ptr) == 0 => *ptr == 0
strlen(ptr) != 0 => *ptr != 0
Other cases should reduce to one of these two (or a constant)
due to the return value of strlen being unsigned. */
if ((code == EQ_EXPR || code == NE_EXPR)
&& integer_zerop (arg1)
- && TREE_CODE (arg0) == CALL_EXPR
- && TREE_CODE (TREE_OPERAND (arg0, 0)) == ADDR_EXPR)
+ && TREE_CODE (arg0) == CALL_EXPR)
{
- tree fndecl = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
+ tree fndecl = get_callee_fndecl (arg0);
tree arglist;
- if (TREE_CODE (fndecl) == FUNCTION_DECL
+ if (fndecl
&& DECL_BUILT_IN (fndecl)
&& DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_MD
&& DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STRLEN
else if (operand_equal_p (arg1, TREE_OPERAND (expr, 2), 0))
return pedantic_omit_one_operand (type, arg1, arg0);
- /* If the second operand is zero, invert the comparison and swap
- the second and third operands. Likewise if the second operand
- is constant and the third is not or if the third operand is
- equivalent to the first operand of the comparison. */
-
- if (integer_zerop (arg1)
- || (TREE_CONSTANT (arg1) && ! TREE_CONSTANT (TREE_OPERAND (t, 2)))
- || (TREE_CODE_CLASS (TREE_CODE (arg0)) == '<'
- && operand_equal_for_comparison_p (TREE_OPERAND (arg0, 0),
- TREE_OPERAND (t, 2),
- TREE_OPERAND (arg0, 1))))
- {
- /* See if this can be inverted. If it can't, possibly because
- it was a floating-point inequality comparison, don't do
- anything. */
- tem = invert_truthvalue (arg0);
-
- if (TREE_CODE (tem) != TRUTH_NOT_EXPR)
- {
- t = build (code, type, tem,
- TREE_OPERAND (t, 2), TREE_OPERAND (t, 1));
- arg0 = tem;
- /* arg1 should be the first argument of the new T. */
- arg1 = TREE_OPERAND (t, 1);
- STRIP_NOPS (arg1);
- }
- }
-
/* If we have A op B ? A : C, we may be able to convert this to a
simpler expression, depending on the operation and the values
of B and C. Signed zeros prevent all of these transformations,
case EQ_EXPR:
/* We can replace A with C1 in this case. */
arg1 = convert (type, TREE_OPERAND (arg0, 1));
- t = build (code, type, TREE_OPERAND (t, 0), arg1,
- TREE_OPERAND (t, 2));
- break;
+ return fold (build (code, type, TREE_OPERAND (t, 0), arg1,
+ TREE_OPERAND (t, 2)));
case LT_EXPR:
/* If C1 is C2 + 1, this is min(A, C2). */
/* If the second operand is simpler than the third, swap them
since that produces better jump optimization results. */
- if ((TREE_CONSTANT (arg1) || DECL_P (arg1)
- || TREE_CODE (arg1) == SAVE_EXPR)
- && ! (TREE_CONSTANT (TREE_OPERAND (t, 2))
- || DECL_P (TREE_OPERAND (t, 2))
- || TREE_CODE (TREE_OPERAND (t, 2)) == SAVE_EXPR))
+ if (tree_swap_operands_p (TREE_OPERAND (t, 1), TREE_OPERAND (t, 2)))
{
/* See if this can be inverted. If it can't, possibly because
it was a floating-point inequality comparison, don't do
tem = invert_truthvalue (arg0);
if (TREE_CODE (tem) != TRUTH_NOT_EXPR)
- {
- t = build (code, type, tem,
- TREE_OPERAND (t, 2), TREE_OPERAND (t, 1));
- arg0 = tem;
- /* arg1 should be the first argument of the new T. */
- arg1 = TREE_OPERAND (t, 1);
- STRIP_NOPS (arg1);
- }
+ return fold (build (code, type, tem,
+ TREE_OPERAND (t, 2), TREE_OPERAND (t, 1)));
}
/* Convert A ? 1 : 0 to simply A. */
} /* switch (code) */
}
+#ifdef ENABLE_FOLD_CHECKING
+#undef fold
+
+static void fold_checksum_tree (tree, struct md5_ctx *, htab_t);
+static void fold_check_failed (tree, tree);
+void print_fold_checksum (tree);
+
+/* When --enable-checking=fold, compute a digest of expr before
+ and after actual fold call to see if fold did not accidentally
+ change original expr. */
+
+tree
+fold (tree expr)
+{
+ tree ret;
+ struct md5_ctx ctx;
+ unsigned char checksum_before[16], checksum_after[16];
+ htab_t ht;
+
+ ht = htab_create (32, htab_hash_pointer, htab_eq_pointer, NULL);
+ md5_init_ctx (&ctx);
+ fold_checksum_tree (expr, &ctx, ht);
+ md5_finish_ctx (&ctx, checksum_before);
+ htab_empty (ht);
+
+ ret = fold_1 (expr);
+
+ md5_init_ctx (&ctx);
+ fold_checksum_tree (expr, &ctx, ht);
+ md5_finish_ctx (&ctx, checksum_after);
+ htab_delete (ht);
+
+ if (memcmp (checksum_before, checksum_after, 16))
+ fold_check_failed (expr, ret);
+
+ return ret;
+}
+
+void
+print_fold_checksum (tree expr)
+{
+ struct md5_ctx ctx;
+ unsigned char checksum[16], cnt;
+ htab_t ht;
+
+ ht = htab_create (32, htab_hash_pointer, htab_eq_pointer, NULL);
+ md5_init_ctx (&ctx);
+ fold_checksum_tree (expr, &ctx, ht);
+ md5_finish_ctx (&ctx, checksum);
+ htab_delete (ht);
+ for (cnt = 0; cnt < 16; ++cnt)
+ fprintf (stderr, "%02x", checksum[cnt]);
+ putc ('\n', stderr);
+}
+
+static void
+fold_check_failed (tree expr ATTRIBUTE_UNUSED, tree ret ATTRIBUTE_UNUSED)
+{
+ internal_error ("fold check: original tree changed by fold");
+}
+
+static void
+fold_checksum_tree (tree expr, struct md5_ctx *ctx, htab_t ht)
+{
+ void **slot;
+ enum tree_code code;
+ char buf[sizeof (struct tree_decl)];
+ int i, len;
+
+ if (sizeof (struct tree_exp) + 5 * sizeof (tree)
+ > sizeof (struct tree_decl)
+ || sizeof (struct tree_type) > sizeof (struct tree_decl))
+ abort ();
+ if (expr == NULL)
+ return;
+ slot = htab_find_slot (ht, expr, INSERT);
+ if (*slot != NULL)
+ return;
+ *slot = expr;
+ code = TREE_CODE (expr);
+ if (code == SAVE_EXPR && SAVE_EXPR_NOPLACEHOLDER (expr))
+ {
+ /* Allow SAVE_EXPR_NOPLACEHOLDER flag to be modified. */
+ memcpy (buf, expr, tree_size (expr));
+ expr = (tree) buf;
+ SAVE_EXPR_NOPLACEHOLDER (expr) = 0;
+ }
+ else if (TREE_CODE_CLASS (code) == 'd' && DECL_ASSEMBLER_NAME_SET_P (expr))
+ {
+ /* Allow DECL_ASSEMBLER_NAME to be modified. */
+ memcpy (buf, expr, tree_size (expr));
+ expr = (tree) buf;
+ SET_DECL_ASSEMBLER_NAME (expr, NULL);
+ }
+ else if (TREE_CODE_CLASS (code) == 't'
+ && (TYPE_POINTER_TO (expr) || TYPE_REFERENCE_TO (expr)))
+ {
+ /* Allow TYPE_POINTER_TO and TYPE_REFERENCE_TO to be modified. */
+ memcpy (buf, expr, tree_size (expr));
+ expr = (tree) buf;
+ TYPE_POINTER_TO (expr) = NULL;
+ TYPE_REFERENCE_TO (expr) = NULL;
+ }
+ md5_process_bytes (expr, tree_size (expr), ctx);
+ fold_checksum_tree (TREE_TYPE (expr), ctx, ht);
+ if (TREE_CODE_CLASS (code) != 't' && TREE_CODE_CLASS (code) != 'd')
+ fold_checksum_tree (TREE_CHAIN (expr), ctx, ht);
+ len = TREE_CODE_LENGTH (code);
+ switch (TREE_CODE_CLASS (code))
+ {
+ case 'c':
+ switch (code)
+ {
+ case STRING_CST:
+ md5_process_bytes (TREE_STRING_POINTER (expr),
+ TREE_STRING_LENGTH (expr), ctx);
+ break;
+ case COMPLEX_CST:
+ fold_checksum_tree (TREE_REALPART (expr), ctx, ht);
+ fold_checksum_tree (TREE_IMAGPART (expr), ctx, ht);
+ break;
+ case VECTOR_CST:
+ fold_checksum_tree (TREE_VECTOR_CST_ELTS (expr), ctx, ht);
+ break;
+ default:
+ break;
+ }
+ break;
+ case 'x':
+ switch (code)
+ {
+ case TREE_LIST:
+ fold_checksum_tree (TREE_PURPOSE (expr), ctx, ht);
+ fold_checksum_tree (TREE_VALUE (expr), ctx, ht);
+ break;
+ case TREE_VEC:
+ for (i = 0; i < TREE_VEC_LENGTH (expr); ++i)
+ fold_checksum_tree (TREE_VEC_ELT (expr, i), ctx, ht);
+ break;
+ default:
+ break;
+ }
+ break;
+ case 'e':
+ switch (code)
+ {
+ case SAVE_EXPR: len = 2; break;
+ case GOTO_SUBROUTINE_EXPR: len = 0; break;
+ case RTL_EXPR: len = 0; break;
+ case WITH_CLEANUP_EXPR: len = 2; break;
+ default: break;
+ }
+ /* FALLTHROUGH */
+ case 'r':
+ case '<':
+ case '1':
+ case '2':
+ case 's':
+ for (i = 0; i < len; ++i)
+ fold_checksum_tree (TREE_OPERAND (expr, i), ctx, ht);
+ break;
+ case 'd':
+ fold_checksum_tree (DECL_SIZE (expr), ctx, ht);
+ fold_checksum_tree (DECL_SIZE_UNIT (expr), ctx, ht);
+ fold_checksum_tree (DECL_NAME (expr), ctx, ht);
+ fold_checksum_tree (DECL_CONTEXT (expr), ctx, ht);
+ fold_checksum_tree (DECL_ARGUMENTS (expr), ctx, ht);
+ fold_checksum_tree (DECL_RESULT_FLD (expr), ctx, ht);
+ fold_checksum_tree (DECL_INITIAL (expr), ctx, ht);
+ fold_checksum_tree (DECL_ABSTRACT_ORIGIN (expr), ctx, ht);
+ fold_checksum_tree (DECL_SECTION_NAME (expr), ctx, ht);
+ fold_checksum_tree (DECL_ATTRIBUTES (expr), ctx, ht);
+ fold_checksum_tree (DECL_VINDEX (expr), ctx, ht);
+ break;
+ case 't':
+ fold_checksum_tree (TYPE_VALUES (expr), ctx, ht);
+ fold_checksum_tree (TYPE_SIZE (expr), ctx, ht);
+ fold_checksum_tree (TYPE_SIZE_UNIT (expr), ctx, ht);
+ fold_checksum_tree (TYPE_ATTRIBUTES (expr), ctx, ht);
+ fold_checksum_tree (TYPE_NAME (expr), ctx, ht);
+ fold_checksum_tree (TYPE_MIN_VALUE (expr), ctx, ht);
+ fold_checksum_tree (TYPE_MAX_VALUE (expr), ctx, ht);
+ fold_checksum_tree (TYPE_MAIN_VARIANT (expr), ctx, ht);
+ fold_checksum_tree (TYPE_BINFO (expr), ctx, ht);
+ fold_checksum_tree (TYPE_CONTEXT (expr), ctx, ht);
+ break;
+ default:
+ break;
+ }
+}
+
+#endif
+
+/* Perform constant folding and related simplification of initializer
+ expression EXPR. This behaves identically to "fold" but ignores
+ potential run-time traps and exceptions that fold must preserve. */
+
+tree
+fold_initializer (tree expr)
+{
+ int saved_signaling_nans = flag_signaling_nans;
+ int saved_trapping_math = flag_trapping_math;
+ int saved_trapv = flag_trapv;
+ tree result;
+
+ flag_signaling_nans = 0;
+ flag_trapping_math = 0;
+ flag_trapv = 0;
+
+ result = fold (expr);
+
+ flag_signaling_nans = saved_signaling_nans;
+ flag_trapping_math = saved_trapping_math;
+ flag_trapv = saved_trapv;
+
+ return result;
+}
+
/* Determine if first argument is a multiple of second argument. Return 0 if
it is not, or we cannot easily determined it to be.
transformed version). */
static int
-multiple_of_p (type, top, bottom)
- tree type;
- tree top;
- tree bottom;
+multiple_of_p (tree type, tree top, tree bottom)
{
if (operand_equal_p (top, bottom, 0))
return 1;
/* Return true if `t' is known to be non-negative. */
int
-tree_expr_nonnegative_p (t)
- tree t;
+tree_expr_nonnegative_p (tree t)
{
switch (TREE_CODE (t))
{
case ABS_EXPR:
- case FFS_EXPR:
return 1;
+
case INTEGER_CST:
return tree_int_cst_sgn (t) >= 0;
+
+ case REAL_CST:
+ return ! REAL_VALUE_NEGATIVE (TREE_REAL_CST (t));
+
+ case PLUS_EXPR:
+ if (FLOAT_TYPE_P (TREE_TYPE (t)))
+ return tree_expr_nonnegative_p (TREE_OPERAND (t, 0))
+ && tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
+
+ /* zero_extend(x) + zero_extend(y) is non-negative if x and y are
+ both unsigned and at least 2 bits shorter than the result. */
+ if (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
+ && TREE_CODE (TREE_OPERAND (t, 0)) == NOP_EXPR
+ && TREE_CODE (TREE_OPERAND (t, 1)) == NOP_EXPR)
+ {
+ tree inner1 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 0), 0));
+ tree inner2 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 1), 0));
+ if (TREE_CODE (inner1) == INTEGER_TYPE && TREE_UNSIGNED (inner1)
+ && TREE_CODE (inner2) == INTEGER_TYPE && TREE_UNSIGNED (inner2))
+ {
+ unsigned int prec = MAX (TYPE_PRECISION (inner1),
+ TYPE_PRECISION (inner2)) + 1;
+ return prec < TYPE_PRECISION (TREE_TYPE (t));
+ }
+ }
+ break;
+
+ case MULT_EXPR:
+ if (FLOAT_TYPE_P (TREE_TYPE (t)))
+ {
+ /* x * x for floating point x is always non-negative. */
+ if (operand_equal_p (TREE_OPERAND (t, 0), TREE_OPERAND (t, 1), 0))
+ return 1;
+ return tree_expr_nonnegative_p (TREE_OPERAND (t, 0))
+ && tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
+ }
+
+ /* zero_extend(x) * zero_extend(y) is non-negative if x and y are
+ both unsigned and their total bits is shorter than the result. */
+ if (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
+ && TREE_CODE (TREE_OPERAND (t, 0)) == NOP_EXPR
+ && TREE_CODE (TREE_OPERAND (t, 1)) == NOP_EXPR)
+ {
+ tree inner1 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 0), 0));
+ tree inner2 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 1), 0));
+ if (TREE_CODE (inner1) == INTEGER_TYPE && TREE_UNSIGNED (inner1)
+ && TREE_CODE (inner2) == INTEGER_TYPE && TREE_UNSIGNED (inner2))
+ return TYPE_PRECISION (inner1) + TYPE_PRECISION (inner2)
+ < TYPE_PRECISION (TREE_TYPE (t));
+ }
+ return 0;
+
case TRUNC_DIV_EXPR:
case CEIL_DIV_EXPR:
case FLOOR_DIV_EXPR:
case ROUND_DIV_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0))
- && tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
+ && tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
+
case TRUNC_MOD_EXPR:
case CEIL_MOD_EXPR:
case FLOOR_MOD_EXPR:
case ROUND_MOD_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
+
+ case RDIV_EXPR:
+ return tree_expr_nonnegative_p (TREE_OPERAND (t, 0))
+ && tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
+
+ case NOP_EXPR:
+ {
+ tree inner_type = TREE_TYPE (TREE_OPERAND (t, 0));
+ tree outer_type = TREE_TYPE (t);
+
+ if (TREE_CODE (outer_type) == REAL_TYPE)
+ {
+ if (TREE_CODE (inner_type) == REAL_TYPE)
+ return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
+ if (TREE_CODE (inner_type) == INTEGER_TYPE)
+ {
+ if (TREE_UNSIGNED (inner_type))
+ return 1;
+ return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
+ }
+ }
+ else if (TREE_CODE (outer_type) == INTEGER_TYPE)
+ {
+ if (TREE_CODE (inner_type) == REAL_TYPE)
+ return tree_expr_nonnegative_p (TREE_OPERAND (t,0));
+ if (TREE_CODE (inner_type) == INTEGER_TYPE)
+ return TYPE_PRECISION (inner_type) < TYPE_PRECISION (outer_type)
+ && TREE_UNSIGNED (inner_type);
+ }
+ }
+ break;
+
case COND_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 1))
&& tree_expr_nonnegative_p (TREE_OPERAND (t, 2));
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
case NON_LVALUE_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
+ case FLOAT_EXPR:
+ return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
case RTL_EXPR:
return rtl_expr_nonnegative_p (RTL_EXPR_RTL (t));
+ case CALL_EXPR:
+ {
+ tree fndecl = get_callee_fndecl (t);
+ tree arglist = TREE_OPERAND (t, 1);
+ if (fndecl
+ && DECL_BUILT_IN (fndecl)
+ && DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_MD)
+ switch (DECL_FUNCTION_CODE (fndecl))
+ {
+ case BUILT_IN_CABS:
+ case BUILT_IN_CABSL:
+ case BUILT_IN_CABSF:
+ case BUILT_IN_EXP:
+ case BUILT_IN_EXPF:
+ case BUILT_IN_EXPL:
+ case BUILT_IN_EXP2:
+ case BUILT_IN_EXP2F:
+ case BUILT_IN_EXP2L:
+ case BUILT_IN_EXP10:
+ case BUILT_IN_EXP10F:
+ case BUILT_IN_EXP10L:
+ case BUILT_IN_FABS:
+ case BUILT_IN_FABSF:
+ case BUILT_IN_FABSL:
+ case BUILT_IN_FFS:
+ case BUILT_IN_FFSL:
+ case BUILT_IN_FFSLL:
+ case BUILT_IN_PARITY:
+ case BUILT_IN_PARITYL:
+ case BUILT_IN_PARITYLL:
+ case BUILT_IN_POPCOUNT:
+ case BUILT_IN_POPCOUNTL:
+ case BUILT_IN_POPCOUNTLL:
+ case BUILT_IN_POW10:
+ case BUILT_IN_POW10F:
+ case BUILT_IN_POW10L:
+ case BUILT_IN_SQRT:
+ case BUILT_IN_SQRTF:
+ case BUILT_IN_SQRTL:
+ return 1;
+
+ case BUILT_IN_ATAN:
+ case BUILT_IN_ATANF:
+ case BUILT_IN_ATANL:
+ case BUILT_IN_CEIL:
+ case BUILT_IN_CEILF:
+ case BUILT_IN_CEILL:
+ case BUILT_IN_FLOOR:
+ case BUILT_IN_FLOORF:
+ case BUILT_IN_FLOORL:
+ case BUILT_IN_NEARBYINT:
+ case BUILT_IN_NEARBYINTF:
+ case BUILT_IN_NEARBYINTL:
+ case BUILT_IN_ROUND:
+ case BUILT_IN_ROUNDF:
+ case BUILT_IN_ROUNDL:
+ case BUILT_IN_TRUNC:
+ case BUILT_IN_TRUNCF:
+ case BUILT_IN_TRUNCL:
+ return tree_expr_nonnegative_p (TREE_VALUE (arglist));
+
+ case BUILT_IN_POW:
+ case BUILT_IN_POWF:
+ case BUILT_IN_POWL:
+ return tree_expr_nonnegative_p (TREE_VALUE (arglist));
+
+ default:
+ break;
+ }
+ }
+
+ /* ... fall through ... */
+
default:
if (truth_value_p (TREE_CODE (t)))
/* Truth values evaluate to 0 or 1, which is nonnegative. */
return 1;
- else
- /* We don't know sign of `t', so be conservative and return false. */
- return 0;
}
+
+ /* We don't know sign of `t', so be conservative and return false. */
+ return 0;
}
/* Return true if `r' is known to be non-negative.
Only handles constants at the moment. */
int
-rtl_expr_nonnegative_p (r)
- rtx r;
+rtl_expr_nonnegative_p (rtx r)
{
switch (GET_CODE (r))
{
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