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re PR middle-end/21032 (With -frounding-math, incorrectly reorders unary minus) 

2006-10-23  Richard Guenther  <rguenther@suse.de>

	PR middle-end/21032
	* convert.c (convert_to_real): Fold (float)-x to -(float)x
	only if not flag_rounding_math.

	* gcc.dg/pr21032.c: New testcase.

From-SVN: r117968
This commit is contained in:
Richard Guenther 2006-10-23 07:15:45 +00:00 committed by Richard Biener
parent 1b406eadf9
commit 4f76e46b18
4 changed files with 26 additions and 2 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2006-10-23 Richard Guenther <rguenther@suse.de>
PR middle-end/21032
* convert.c (convert_to_real): Fold (float)-x to -(float)x
only if not flag_rounding_math.
2006-10-22 Richard Sandiford <richard@codesourcery.com>
Kaz Kojima <kkojima@gcc.gnu.org>

6
gcc/convert.c
View File

@ -248,10 +248,12 @@ convert_to_real (tree type, tree expr)
if (itype != type && FLOAT_TYPE_P (type))
switch (TREE_CODE (expr))
{
/* Convert (float)-x into -(float)x. This is always safe. */
/* Convert (float)-x into -(float)x. This is safe for
round-to-nearest rounding mode. */
case ABS_EXPR:
case NEGATE_EXPR:
if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
if (!flag_rounding_math
&& TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
return build1 (TREE_CODE (expr), type,
fold (convert_to_real (type,
TREE_OPERAND (expr, 0))));

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2006-10-23 Richard Guenther <rguenther@suse.de>
PR middle-end/21032
* gcc.dg/pr21032.c: New testcase.
2006-10-22 Jeff Law <law@redhat.com>
Richard Guenther <rguenther@suse.de>

11
gcc/testsuite/gcc.dg/pr21032.c Normal file
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@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-optimized -frounding-math" } */
void bar(float x);
void foo(double x)
{
bar(-x);
}
/* { dg-final { scan-tree-dump-not "-\\(float\\)" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */