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re PR middle-end/50195 (Linking time error with -fast-math -O0)

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2011-10-10  Richard Guenther  <rguenther@suse.de>

	PR middle-end/50195
	* fold-const.c (fold_binary_loc): Canonicalize x*x to pow (x, 2)
	only when optimizing.

	* gcc.dg/builtins-47.c: Optimize.

From-SVN: r179752
This commit is contained in:
Richard Guenther 2011-10-10 14:25:34 +00:00 committed by Richard Biener
parent ff8e7c4d68
commit 4d8b88e8f2
4 changed files with 14 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-10-10 Richard Guenther <rguenther@suse.de>
PR middle-end/50195
* fold-const.c (fold_binary_loc): Canonicalize x*x to pow (x, 2)
only when optimizing.
2011-10-10 Nick Clifton <nickc@redhat.com>
PR middle-end/49801

4
gcc/fold-const.c
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@ -10693,9 +10693,9 @@ fold_binary_loc (location_t loc,
}
}
/* Optimize x*x as pow(x,2.0), which is expanded as x*x. */
/* Canonicalize x*x as pow(x,2.0), which is expanded as x*x. */
if (!in_gimple_form
&& optimize_function_for_speed_p (cfun)
&& optimize
&& operand_equal_p (arg0, arg1, 0))
{
tree powfn = mathfn_built_in (type, BUILT_IN_POW);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2011-10-10 Richard Guenther <rguenther@suse.de>
PR middle-end/50195
* gcc.dg/builtins-47.c: Optimize.
2011-10-10 Aldy Hernandez <aldyh@redhat.com>
* lib/gcc-simulate-thread.exp: New.

2
gcc/testsuite/gcc.dg/builtins-47.c
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@ -1,5 +1,5 @@
/* { dg-do run } */
/* { dg-options "-ffast-math -fdump-tree-gimple" } */
/* { dg-options "-O -ffast-math -fdump-tree-gimple" } */
extern double sqrt (double);
extern double pow (double, double);