-/* Utility routines for data type conversion for GNU C.
- Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997,
- 1998 Free Software Foundation, Inc.
+/* Utility routines for data type conversion for GCC.
+ Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
+ 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
-This file is part of GNU C.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
/* These routines are somewhat language-independent utility function
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "tree.h"
#include "flags.h"
#include "convert.h"
#include "toplev.h"
-
+#include "langhooks.h"
+#include "real.h"
/* Convert EXPR to some pointer or reference type TYPE.
EXPR must be pointer, reference, integer, enumeral, or literal zero;
in other cases error is called. */
tree
-convert_to_pointer (type, expr)
- tree type, expr;
+convert_to_pointer (tree type, tree expr)
{
if (integer_zerop (expr))
{
return
convert_to_pointer (type,
- convert (type_for_size (POINTER_SIZE, 0), expr));
+ convert ((*lang_hooks.types.type_for_size)
+ (POINTER_SIZE, 0), expr));
default:
error ("cannot convert to a pointer type");
}
}
+/* Avoid any floating point extensions from EXP. */
+tree
+strip_float_extensions (tree exp)
+{
+ tree sub, expt, subt;
+
+ /* For floating point constant look up the narrowest type that can hold
+ it properly and handle it like (type)(narrowest_type)constant.
+ This way we can optimize for instance a=a*2.0 where "a" is float
+ but 2.0 is double constant. */
+ if (TREE_CODE (exp) == REAL_CST)
+ {
+ REAL_VALUE_TYPE orig;
+ tree type = NULL;
+
+ orig = TREE_REAL_CST (exp);
+ if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node)
+ && exact_real_truncate (TYPE_MODE (float_type_node), &orig))
+ type = float_type_node;
+ else if (TYPE_PRECISION (TREE_TYPE (exp))
+ > TYPE_PRECISION (double_type_node)
+ && exact_real_truncate (TYPE_MODE (double_type_node), &orig))
+ type = double_type_node;
+ if (type)
+ return build_real (type, real_value_truncate (TYPE_MODE (type), orig));
+ }
+
+ if (TREE_CODE (exp) != NOP_EXPR)
+ return exp;
+
+ sub = TREE_OPERAND (exp, 0);
+ subt = TREE_TYPE (sub);
+ expt = TREE_TYPE (exp);
+
+ if (!FLOAT_TYPE_P (subt))
+ return exp;
+
+ if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt))
+ return exp;
+
+ return strip_float_extensions (sub);
+}
+
+
/* Convert EXPR to some floating-point type TYPE.
EXPR must be float, integer, or enumeral;
in other cases error is called. */
tree
-convert_to_real (type, expr)
- tree type, expr;
+convert_to_real (tree type, tree expr)
{
+ enum built_in_function fcode = builtin_mathfn_code (expr);
+ tree itype = TREE_TYPE (expr);
+
+ /* Disable until we figure out how to decide whether the functions are
+ present in runtime. */
+ /* Convert (float)sqrt((double)x) where x is float into sqrtf(x) */
+ if (optimize
+ && (fcode == BUILT_IN_SQRT
+ || fcode == BUILT_IN_SQRTL
+ || fcode == BUILT_IN_SIN
+ || fcode == BUILT_IN_SINL
+ || fcode == BUILT_IN_COS
+ || fcode == BUILT_IN_COSL
+ || fcode == BUILT_IN_EXP
+ || fcode == BUILT_IN_EXPL
+ || fcode == BUILT_IN_LOG
+ || fcode == BUILT_IN_LOGL)
+ && (TYPE_MODE (type) == TYPE_MODE (double_type_node)
+ || TYPE_MODE (type) == TYPE_MODE (float_type_node)))
+ {
+ tree arg0 = strip_float_extensions (TREE_VALUE (TREE_OPERAND (expr, 1)));
+ tree newtype = type;
+
+ /* We have (outertype)sqrt((innertype)x). Choose the wider mode from
+ the both as the safe type for operation. */
+ if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type))
+ newtype = TREE_TYPE (arg0);
+
+ /* Be careful about integer to fp conversions.
+ These may overflow still. */
+ if (FLOAT_TYPE_P (TREE_TYPE (arg0))
+ && TYPE_PRECISION (newtype) < TYPE_PRECISION (itype)
+ && (TYPE_MODE (newtype) == TYPE_MODE (double_type_node)
+ || TYPE_MODE (newtype) == TYPE_MODE (float_type_node)))
+ {
+ tree arglist;
+ tree fn = mathfn_built_in (newtype, fcode);
+
+ if (fn)
+ {
+ arglist = build_tree_list (NULL_TREE, fold (convert_to_real (newtype, arg0)));
+ expr = build_function_call_expr (fn, arglist);
+ if (newtype == type)
+ return expr;
+ }
+ }
+ }
+ if (optimize
+ && (((fcode == BUILT_IN_FLOORL
+ || fcode == BUILT_IN_CEILL
+ || fcode == BUILT_IN_ROUND
+ || fcode == BUILT_IN_TRUNC
+ || fcode == BUILT_IN_NEARBYINT)
+ && (TYPE_MODE (type) == TYPE_MODE (double_type_node)
+ || TYPE_MODE (type) == TYPE_MODE (float_type_node)))
+ || ((fcode == BUILT_IN_FLOOR
+ || fcode == BUILT_IN_CEIL
+ || fcode == BUILT_IN_ROUND
+ || fcode == BUILT_IN_TRUNC
+ || fcode == BUILT_IN_NEARBYINT)
+ && (TYPE_MODE (type) == TYPE_MODE (float_type_node)))))
+ {
+ tree fn = mathfn_built_in (type, fcode);
+
+ if (fn)
+ {
+ tree arg0 = strip_float_extensions (TREE_VALUE (TREE_OPERAND (expr,
+ 1)));
+ tree arglist = build_tree_list (NULL_TREE,
+ fold (convert_to_real (type, arg0)));
+
+ return build_function_call_expr (fn, arglist);
+ }
+ }
+
+ /* Propagate the cast into the operation. */
+ if (itype != type && FLOAT_TYPE_P (type))
+ switch (TREE_CODE (expr))
+ {
+ /* Convert (float)-x into -(float)x. This is always safe. */
+ case ABS_EXPR:
+ case NEGATE_EXPR:
+ if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
+ return build1 (TREE_CODE (expr), type,
+ fold (convert_to_real (type,
+ TREE_OPERAND (expr, 0))));
+ break;
+ /* Convert (outertype)((innertype0)a+(innertype1)b)
+ into ((newtype)a+(newtype)b) where newtype
+ is the widest mode from all of these. */
+ case PLUS_EXPR:
+ case MINUS_EXPR:
+ case MULT_EXPR:
+ case RDIV_EXPR:
+ {
+ tree arg0 = strip_float_extensions (TREE_OPERAND (expr, 0));
+ tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1));
+
+ if (FLOAT_TYPE_P (TREE_TYPE (arg0))
+ && FLOAT_TYPE_P (TREE_TYPE (arg1)))
+ {
+ tree newtype = type;
+ if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (newtype))
+ newtype = TREE_TYPE (arg0);
+ if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype))
+ newtype = TREE_TYPE (arg1);
+ if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype))
+ {
+ expr = build (TREE_CODE (expr), newtype,
+ fold (convert_to_real (newtype, arg0)),
+ fold (convert_to_real (newtype, arg1)));
+ if (newtype == type)
+ return expr;
+ }
+ }
+ }
+ break;
+ default:
+ break;
+ }
+
switch (TREE_CODE (TREE_TYPE (expr)))
{
case REAL_TYPE:
/* Convert EXPR to some integer (or enum) type TYPE.
- EXPR must be pointer, integer, discrete (enum, char, or bool), or float;
- in other cases error is called.
+ EXPR must be pointer, integer, discrete (enum, char, or bool), float, or
+ vector; in other cases error is called.
The result of this is always supposed to be a newly created tree node
not in use in any existing structure. */
tree
-convert_to_integer (type, expr)
- tree type, expr;
+convert_to_integer (tree type, tree expr)
{
enum tree_code ex_form = TREE_CODE (expr);
tree intype = TREE_TYPE (expr);
if (integer_zerop (expr))
expr = integer_zero_node;
else
- expr = fold (build1 (CONVERT_EXPR,
- type_for_size (POINTER_SIZE, 0), expr));
+ expr = fold (build1 (CONVERT_EXPR, (*lang_hooks.types.type_for_size)
+ (POINTER_SIZE, 0), expr));
return convert_to_integer (type, expr);
if (TREE_CODE_CLASS (ex_form) == '<')
{
+ expr = copy_node (expr);
TREE_TYPE (expr) = type;
return expr;
}
|| ex_form == TRUTH_OR_EXPR || ex_form == TRUTH_ORIF_EXPR
|| ex_form == TRUTH_XOR_EXPR)
{
+ expr = copy_node (expr);
TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0));
TREE_OPERAND (expr, 1) = convert (type, TREE_OPERAND (expr, 1));
TREE_TYPE (expr) = type;
else if (ex_form == TRUTH_NOT_EXPR)
{
+ expr = copy_node (expr);
TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0));
TREE_TYPE (expr) = type;
return expr;
we are truncating EXPR. */
else if (outprec >= inprec)
- return build1 (NOP_EXPR, type, expr);
+ {
+ enum tree_code code;
+
+ /* If the precision of the EXPR's type is K bits and the
+ destination mode has more bits, and the sign is changing,
+ it is not safe to use a NOP_EXPR. For example, suppose
+ that EXPR's type is a 3-bit unsigned integer type, the
+ TYPE is a 3-bit signed integer type, and the machine mode
+ for the types is 8-bit QImode. In that case, the
+ conversion necessitates an explicit sign-extension. In
+ the signed-to-unsigned case the high-order bits have to
+ be cleared. */
+ if (TREE_UNSIGNED (type) != TREE_UNSIGNED (TREE_TYPE (expr))
+ && (TYPE_PRECISION (TREE_TYPE (expr))
+ != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)))))
+ code = CONVERT_EXPR;
+ else
+ code = NOP_EXPR;
+
+ return build1 (code, type, expr);
+ }
/* If TYPE is an enumeral type or a type with a precision less
than the number of bits in its mode, do the conversion to the
else if (TREE_CODE (type) == ENUMERAL_TYPE
|| outprec != GET_MODE_BITSIZE (TYPE_MODE (type)))
return build1 (NOP_EXPR, type,
- convert (type_for_mode (TYPE_MODE (type),
- TREE_UNSIGNED (type)),
+ convert ((*lang_hooks.types.type_for_mode)
+ (TYPE_MODE (type), TREE_UNSIGNED (type)),
expr));
/* Here detect when we can distribute the truncation down past some
case LSHIFT_EXPR:
/* We can pass truncation down through left shifting
- when the shift count is a nonnegative constant. */
+ when the shift count is a nonnegative constant and
+ the target type is unsigned. */
if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
&& tree_int_cst_sgn (TREE_OPERAND (expr, 1)) >= 0
+ && TREE_UNSIGNED (type)
&& TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST)
{
/* If shift count is less than the width of the truncated type,
case BIT_AND_EXPR:
case BIT_IOR_EXPR:
case BIT_XOR_EXPR:
- case BIT_ANDTC_EXPR:
trunc1:
{
tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
{
/* Do the arithmetic in type TYPEX,
then convert result to TYPE. */
- register tree typex = type;
+ tree typex = type;
/* Can't do arithmetic in enumeral types
so use an integer type that will hold the values. */
if (TREE_CODE (typex) == ENUMERAL_TYPE)
- typex = type_for_size (TYPE_PRECISION (typex),
- TREE_UNSIGNED (typex));
+ typex = (*lang_hooks.types.type_for_size)
+ (TYPE_PRECISION (typex), TREE_UNSIGNED (typex));
/* But now perhaps TYPEX is as wide as INPREC.
In that case, do nothing special here.
{
/* Don't do unsigned arithmetic where signed was wanted,
or vice versa.
- Exception: if either of the original operands were
- unsigned then can safely do the work as unsigned.
+ Exception: if both of the original operands were
+ unsigned then we can safely do the work as unsigned.
+ Exception: shift operations take their type solely
+ from the first argument.
+ Exception: the LSHIFT_EXPR case above requires that
+ we perform this operation unsigned lest we produce
+ signed-overflow undefinedness.
And we may need to do it as unsigned
if we truncate to the original size. */
- typex = ((TREE_UNSIGNED (TREE_TYPE (expr))
- || TREE_UNSIGNED (TREE_TYPE (arg0))
- || TREE_UNSIGNED (TREE_TYPE (arg1)))
- ? unsigned_type (typex) : signed_type (typex));
+ if (TREE_UNSIGNED (TREE_TYPE (expr))
+ || (TREE_UNSIGNED (TREE_TYPE (arg0))
+ && (TREE_UNSIGNED (TREE_TYPE (arg1))
+ || ex_form == LSHIFT_EXPR
+ || ex_form == RSHIFT_EXPR
+ || ex_form == LROTATE_EXPR
+ || ex_form == RROTATE_EXPR))
+ || ex_form == LSHIFT_EXPR)
+ typex = (*lang_hooks.types.unsigned_type) (typex);
+ else
+ typex = (*lang_hooks.types.signed_type) (typex);
return convert (type,
fold (build (ex_form, typex,
convert (typex, arg0),
/* This is not correct for ABS_EXPR,
since we must test the sign before truncation. */
{
- register tree typex = type;
+ tree typex = type;
/* Can't do arithmetic in enumeral types
so use an integer type that will hold the values. */
if (TREE_CODE (typex) == ENUMERAL_TYPE)
- typex = type_for_size (TYPE_PRECISION (typex),
- TREE_UNSIGNED (typex));
+ typex = (*lang_hooks.types.type_for_size)
+ (TYPE_PRECISION (typex), TREE_UNSIGNED (typex));
/* But now perhaps TYPEX is as wide as INPREC.
In that case, do nothing special here.
{
/* Don't do unsigned arithmetic where signed was wanted,
or vice versa. */
- typex = (TREE_UNSIGNED (TREE_TYPE (expr))
- ? unsigned_type (typex) : signed_type (typex));
+ if (TREE_UNSIGNED (TREE_TYPE (expr)))
+ typex = (*lang_hooks.types.unsigned_type) (typex);
+ else
+ typex = (*lang_hooks.types.signed_type) (typex);
return convert (type,
fold (build1 (ex_form, typex,
convert (typex,
}
case NOP_EXPR:
+ /* Don't introduce a
+ "can't convert between vector values of different size" error. */
+ if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == VECTOR_TYPE
+ && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0))))
+ != GET_MODE_SIZE (TYPE_MODE (type))))
+ break;
/* If truncating after truncating, might as well do all at once.
If truncating after extending, we may get rid of wasted work. */
return convert (type, get_unwidened (TREE_OPERAND (expr, 0), type));
/* It is sometimes worthwhile to push the narrowing down through
the conditional and never loses. */
return fold (build (COND_EXPR, type, TREE_OPERAND (expr, 0),
- convert (type, TREE_OPERAND (expr, 1)),
+ convert (type, TREE_OPERAND (expr, 1)),
convert (type, TREE_OPERAND (expr, 2))));
default:
fold (build1 (REALPART_EXPR,
TREE_TYPE (TREE_TYPE (expr)), expr)));
+ case VECTOR_TYPE:
+ if (GET_MODE_SIZE (TYPE_MODE (type))
+ != GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr))))
+ {
+ error ("can't convert between vector values of different size");
+ return error_mark_node;
+ }
+ return build1 (NOP_EXPR, type, expr);
+
default:
error ("aggregate value used where an integer was expected");
return convert (type, integer_zero_node);
/* Convert EXPR to the complex type TYPE in the usual ways. */
tree
-convert_to_complex (type, expr)
- tree type, expr;
+convert_to_complex (tree type, tree expr)
{
tree subtype = TREE_TYPE (type);
-
+
switch (TREE_CODE (TREE_TYPE (expr)))
{
case REAL_TYPE:
return convert_to_complex (type, integer_zero_node);
}
}
+
+/* Convert EXPR to the vector type TYPE in the usual ways. */
+
+tree
+convert_to_vector (tree type, tree expr)
+{
+ switch (TREE_CODE (TREE_TYPE (expr)))
+ {
+ case INTEGER_TYPE:
+ case VECTOR_TYPE:
+ if (GET_MODE_SIZE (TYPE_MODE (type))
+ != GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr))))
+ {
+ error ("can't convert between vector values of different size");
+ return error_mark_node;
+ }
+ return build1 (NOP_EXPR, type, expr);
+
+ default:
+ error ("can't convert value to a vector");
+ return convert_to_vector (type, integer_zero_node);
+ }
+}
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