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fold-const.c (split_tree): Associate floatig-point expressions if flag_associative_math is set.

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2008-02-20  Richard Guenther  <rguenther@suse.de>

	* fold-const.c (split_tree): Associate floatig-point expressions
	if flag_associative_math is set.

	* gcc.dg/fold-reassoc-1.c: New testcase.
	* gcc.dg/tree-ssa/recip-3.c: Adjust to not compute d/d.

From-SVN: r132481
This commit is contained in:
Richard Guenther 2008-02-20 14:14:55 +00:00 committed by Richard Biener
parent 2dc0f63301
commit 41bb1f06d3
5 changed files with 22 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2008-02-20 Richard Guenther <rguenther@suse.de>
* fold-const.c (split_tree): Associate floatig-point expressions
if flag_associative_math is set.
2008-02-20 Richard Guenther <rguenther@suse.de>
* tree.h (fold_real_zero_addition_p): Declare.

2
gcc/fold-const.c
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@ -1491,7 +1491,7 @@ split_tree (tree in, enum tree_code code, tree *conp, tree *litp,
|| TREE_CODE (in) == FIXED_CST)
*litp = in;
else if (TREE_CODE (in) == code
|| (! FLOAT_TYPE_P (TREE_TYPE (in))
|| ((! FLOAT_TYPE_P (TREE_TYPE (in)) || flag_associative_math)
&& ! SAT_FIXED_POINT_TYPE_P (TREE_TYPE (in))
/* We can associate addition and subtraction together (even
though the C standard doesn't say so) for integers because

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2008-02-20 Richard Guenther <rguenther@suse.de>
* gcc.dg/fold-reassoc-1.c: New testcase.
* gcc.dg/tree-ssa/recip-3.c: Adjust to not compute d/d.
2008-02-20 Richard Guenther <rguenther@suse.de>
* gcc.dg/tree-ssa/reassoc-13.c: New testcase.

10
gcc/testsuite/gcc.dg/fold-reassoc-1.c Normal file
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@ -0,0 +1,10 @@
/* { dg-do compile } */
/* { dg-options "-O -ffast-math -fdump-tree-original" } */
double foo (double x)
{
return (x + 0.5 - x - 0.5);
}
/* { dg-final { scan-tree-dump "return 0.0;" "original" } } */
/* { dg-final { cleanup-tree-dump "original" } } */

2
gcc/testsuite/gcc.dg/tree-ssa/recip-3.c
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@ -9,7 +9,7 @@ float h ()
int i;
double E, W, P, d;
W = 1.;
W = 1.1;
d = 2.*e;
E = 1. - d;