static REAL_VALUE_TYPE dconste;
static int get_pointer_alignment (tree, unsigned int);
-static tree c_strlen (tree);
+static tree c_strlen (tree, int);
static const char *c_getstr (tree);
static rtx c_readstr (const char *, enum machine_mode);
static int target_char_cast (tree, char *);
static tree fold_builtin_inf (tree, int);
static tree fold_builtin_nan (tree, tree, int);
static int validate_arglist (tree, ...);
+static bool integer_valued_real_p (tree);
static tree fold_trunc_transparent_mathfn (tree);
static bool readonly_data_expr (tree);
static rtx expand_builtin_fabs (tree, rtx, rtx);
static rtx expand_builtin_cabs (tree, rtx);
static void init_builtin_dconsts (void);
static tree fold_builtin_cabs (tree, tree, tree);
+static tree fold_builtin_trunc (tree);
+static tree fold_builtin_floor (tree);
+static tree fold_builtin_ceil (tree);
/* Initialize mathematical constants for constant folding builtins.
These constants need to be given to at least 160 bits precision. */
way, because it could contain a zero byte in the middle.
TREE_STRING_LENGTH is the size of the character array, not the string.
+ ONLY_VALUE should be nonzero if the result is not going to be emitted
+ into the instruction stream and zero if it is going to be expanded.
+ E.g. with i++ ? "foo" : "bar", if ONLY_VALUE is nonzero, constant 3
+ is returned, otherwise NULL, since
+ len = c_strlen (src, 1); if (len) expand_expr (len, ...); would not
+ evaluate the side-effects.
+
The value returned is of type `ssizetype'.
Unfortunately, string_constant can't access the values of const char
arrays with initializers, so neither can we do so here. */
static tree
-c_strlen (tree src)
+c_strlen (tree src, int only_value)
{
tree offset_node;
HOST_WIDE_INT offset;
int max;
const char *ptr;
+ STRIP_NOPS (src);
+ if (TREE_CODE (src) == COND_EXPR
+ && (only_value || !TREE_SIDE_EFFECTS (TREE_OPERAND (src, 0))))
+ {
+ tree len1, len2;
+
+ len1 = c_strlen (TREE_OPERAND (src, 1), only_value);
+ len2 = c_strlen (TREE_OPERAND (src, 2), only_value);
+ if (tree_int_cst_equal (len1, len2))
+ return len1;
+ }
+
+ if (TREE_CODE (src) == COMPOUND_EXPR
+ && (only_value || !TREE_SIDE_EFFECTS (TREE_OPERAND (src, 0))))
+ return c_strlen (TREE_OPERAND (src, 1), only_value);
+
src = string_constant (src, &offset_node);
if (src == 0)
return 0;
do_pending_stack_adjust ();
NO_DEFER_POP;
- /* Save the stack with nonlocal if available */
+ /* Save the stack with nonlocal if available. */
#ifdef HAVE_save_stack_nonlocal
if (HAVE_save_stack_nonlocal)
emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
/* Make a suitable register to place result in. */
mode = TYPE_MODE (TREE_TYPE (exp));
+
+ /* Before working hard, check whether the instruction is available. */
+ if (builtin_optab->handlers[(int) mode].insn_code == CODE_FOR_nothing)
+ return 0;
target = gen_reg_rtx (mode);
if (! flag_errno_math || ! HONOR_NANS (mode))
/* Make a suitable register to place result in. */
mode = TYPE_MODE (TREE_TYPE (exp));
+
+ /* Before working hard, check whether the instruction is available. */
+ if (builtin_optab->handlers[(int) mode].insn_code == CODE_FOR_nothing)
+ return 0;
+
target = gen_reg_rtx (mode);
if (! flag_errno_math || ! HONOR_NANS (mode))
int align;
/* If the length can be computed at compile-time, return it. */
- len = c_strlen (src);
+ len = c_strlen (src, 0);
if (len)
return expand_expr (len, target, target_mode, EXPAND_NORMAL);
+ /* If the length can be computed at compile-time and is constant
+ integer, but there are side-effects in src, evaluate
+ src for side-effects, then return len.
+ E.g. x = strlen (i++ ? "xfoo" + 1 : "bar");
+ can be optimized into: i++; x = 3; */
+ len = c_strlen (src, 1);
+ if (len && TREE_CODE (len) == INTEGER_CST)
+ {
+ expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
+ return expand_expr (len, target, target_mode, EXPAND_NORMAL);
+ }
+
align = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
/* If SRC is not a pointer type, don't do this operation inline. */
return 0;
src = TREE_VALUE (TREE_CHAIN (arglist));
- len = c_strlen (src);
+ len = c_strlen (src, 1);
if (len == 0 || TREE_SIDE_EFFECTS (len))
return 0;
because the latter will potentially produce pessimized code
when used to produce the return value. */
src = TREE_VALUE (TREE_CHAIN (arglist));
- if (! c_getstr (src) || ! (len = c_strlen (src)))
+ if (! c_getstr (src) || ! (len = c_strlen (src, 0)))
return 0;
dst = TREE_VALUE (arglist);
return 0;
else
{
- tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
+ tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)), 1);
tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
tree fn;
enum machine_mode insn_mode
= insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
- len1 = c_strlen (arg1);
- len2 = c_strlen (arg2);
+ len1 = c_strlen (arg1, 1);
+ len2 = c_strlen (arg2, 1);
if (len1)
len1 = size_binop (PLUS_EXPR, ssize_int (1), len1);
enum machine_mode insn_mode
= insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
- len1 = c_strlen (arg1);
- len2 = c_strlen (arg2);
+ len1 = c_strlen (arg1, 1);
+ len2 = c_strlen (arg2, 1);
if (len1)
len1 = size_binop (PLUS_EXPR, ssize_int (1), len1);
/* Get the length of the string passed to fputs. If the length
can't be determined, punt. */
- if (!(len = c_strlen (TREE_VALUE (arglist)))
+ if (!(len = c_strlen (TREE_VALUE (arglist), 1))
|| TREE_CODE (len) != INTEGER_CST)
return 0;
if (target != const0_rtx)
{
- len = c_strlen (arg);
+ len = c_strlen (arg, 1);
if (! len || TREE_CODE (len) != INTEGER_CST)
return 0;
}
return build_real (type, real);
}
-/* EXP is assumed to me builtin call where truncation can be propagated
+/* Return true if the floating point expression T has an integer value.
+ We also allow +Inf, -Inf and NaN to be considered integer values. */
+
+static bool
+integer_valued_real_p (tree t)
+{
+ switch (TREE_CODE (t))
+ {
+ case FLOAT_EXPR:
+ return true;
+
+ case ABS_EXPR:
+ case SAVE_EXPR:
+ case NON_LVALUE_EXPR:
+ return integer_valued_real_p (TREE_OPERAND (t, 0));
+
+ case COMPOUND_EXPR:
+ case MODIFY_EXPR:
+ case BIND_EXPR:
+ return integer_valued_real_p (TREE_OPERAND (t, 1));
+
+ case PLUS_EXPR:
+ case MINUS_EXPR:
+ case MULT_EXPR:
+ case MIN_EXPR:
+ case MAX_EXPR:
+ return integer_valued_real_p (TREE_OPERAND (t, 0))
+ && integer_valued_real_p (TREE_OPERAND (t, 1));
+
+ case COND_EXPR:
+ return integer_valued_real_p (TREE_OPERAND (t, 1))
+ && integer_valued_real_p (TREE_OPERAND (t, 2));
+
+ case REAL_CST:
+ if (! TREE_CONSTANT_OVERFLOW (t))
+ {
+ REAL_VALUE_TYPE c, cint;
+
+ c = TREE_REAL_CST (t);
+ real_trunc (&cint, TYPE_MODE (TREE_TYPE (t)), &c);
+ return real_identical (&c, &cint);
+ }
+
+ case NOP_EXPR:
+ {
+ tree type = TREE_TYPE (TREE_OPERAND (t, 0));
+ if (TREE_CODE (type) == INTEGER_TYPE)
+ return true;
+ if (TREE_CODE (type) == REAL_TYPE)
+ return integer_valued_real_p (TREE_OPERAND (t, 0));
+ break;
+ }
+
+ case CALL_EXPR:
+ switch (builtin_mathfn_code (t))
+ {
+ 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 true;
+
+ default:
+ break;
+ }
+ break;
+
+ default:
+ break;
+ }
+ return false;
+}
+
+/* EXP is assumed to be builtin call where truncation can be propagated
across (for instance floor((double)f) == (double)floorf (f).
Do the transformation. */
+
static tree
fold_trunc_transparent_mathfn (tree exp)
{
tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
tree arglist = TREE_OPERAND (exp, 1);
enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ tree arg;
+
+ if (! validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ arg = TREE_VALUE (arglist);
+ /* Integer rounding functions are idempotent. */
+ if (fcode == builtin_mathfn_code (arg))
+ return arg;
+
+ /* If argument is already integer valued, and we don't need to worry
+ about setting errno, there's no need to perform rounding. */
+ if (! flag_errno_math && integer_valued_real_p (arg))
+ return arg;
- if (optimize && validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ if (optimize)
{
- tree arg0 = strip_float_extensions (TREE_VALUE (arglist));
+ tree arg0 = strip_float_extensions (arg);
tree ftype = TREE_TYPE (exp);
tree newtype = TREE_TYPE (arg0);
tree decl;
return NULL_TREE;
}
+/* Fold function call to builtin trunc, truncf or truncl. Return
+ NULL_TREE if no simplification can be made. */
+
+static tree
+fold_builtin_trunc (tree exp)
+{
+ tree arglist = TREE_OPERAND (exp, 1);
+ tree arg;
+
+ if (! validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ /* Optimize trunc of constant value. */
+ arg = TREE_VALUE (arglist);
+ if (TREE_CODE (arg) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (arg))
+ {
+ REAL_VALUE_TYPE r, x;
+ tree type = TREE_TYPE (exp);
+
+ x = TREE_REAL_CST (arg);
+ real_trunc (&r, TYPE_MODE (type), &x);
+ return build_real (type, r);
+ }
+
+ return fold_trunc_transparent_mathfn (exp);
+}
+
+/* Fold function call to builtin floor, floorf or floorl. Return
+ NULL_TREE if no simplification can be made. */
+
+static tree
+fold_builtin_floor (tree exp)
+{
+ tree arglist = TREE_OPERAND (exp, 1);
+ tree arg;
+
+ if (! validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ /* Optimize floor of constant value. */
+ arg = TREE_VALUE (arglist);
+ if (TREE_CODE (arg) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (arg))
+ {
+ REAL_VALUE_TYPE x;
+
+ x = TREE_REAL_CST (arg);
+ if (! REAL_VALUE_ISNAN (x) || ! flag_errno_math)
+ {
+ tree type = TREE_TYPE (exp);
+ REAL_VALUE_TYPE r;
+
+ real_floor (&r, TYPE_MODE (type), &x);
+ return build_real (type, r);
+ }
+ }
+
+ return fold_trunc_transparent_mathfn (exp);
+}
+
+/* Fold function call to builtin ceil, ceilf or ceill. Return
+ NULL_TREE if no simplification can be made. */
+
+static tree
+fold_builtin_ceil (tree exp)
+{
+ tree arglist = TREE_OPERAND (exp, 1);
+ tree arg;
+
+ if (! validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
+ return 0;
+
+ /* Optimize ceil of constant value. */
+ arg = TREE_VALUE (arglist);
+ if (TREE_CODE (arg) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (arg))
+ {
+ REAL_VALUE_TYPE x;
+
+ x = TREE_REAL_CST (arg);
+ if (! REAL_VALUE_ISNAN (x) || ! flag_errno_math)
+ {
+ tree type = TREE_TYPE (exp);
+ REAL_VALUE_TYPE r;
+
+ real_ceil (&r, TYPE_MODE (type), &x);
+ return build_real (type, r);
+ }
+ }
+
+ return fold_trunc_transparent_mathfn (exp);
+}
+
/* Used by constant folding to eliminate some builtin calls early. EXP is
the CALL_EXPR of a call to a builtin function. */
case BUILT_IN_STRLEN:
if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
{
- tree len = c_strlen (TREE_VALUE (arglist));
+ tree len = c_strlen (TREE_VALUE (arglist), 0);
if (len)
{
/* Convert from the internal "sizetype" type to "size_t". */
case BUILT_IN_FLOOR:
case BUILT_IN_FLOORF:
case BUILT_IN_FLOORL:
+ return fold_builtin_floor (exp);
+
case BUILT_IN_CEIL:
case BUILT_IN_CEILF:
case BUILT_IN_CEILL:
+ return fold_builtin_ceil (exp);
+
case BUILT_IN_TRUNC:
case BUILT_IN_TRUNCF:
case BUILT_IN_TRUNCL:
+ return fold_builtin_trunc (exp);
+
case BUILT_IN_ROUND:
case BUILT_IN_ROUNDF:
case BUILT_IN_ROUNDL:
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