This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
[PATCH] Fix PR49361
- From: Richard Guenther <rguenther at suse dot de>
- To: gcc-patches at gcc dot gnu dot org
- Date: Fri, 10 Jun 2011 14:17:54 +0200 (CEST)
- Subject: [PATCH] Fix PR49361
This fixes a fallout of pow(x,2.0) expander removal. As discussed
several times we shouldn't really fold x*x to pow(x,2) - at least
not when we're in gimple form already as we'll never see
followup folding opportunities that folding was designed to catch.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2011-06-10 Richard Guenther <rguenther@suse.de>
PR tree-optimization/49361
* fold-const.c (fold_binary_loc): Only fold x * x to pow (x, 2.0)
when not already in gimple form.
Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c (revision 174891)
+++ gcc/fold-const.c (working copy)
@@ -10519,7 +10519,8 @@ fold_binary_loc (location_t loc,
}
/* Optimize x*x as pow(x,2.0), which is expanded as x*x. */
- if (optimize_function_for_speed_p (cfun)
+ if (!in_gimple_form
+ && optimize_function_for_speed_p (cfun)
&& operand_equal_p (arg0, arg1, 0))
{
tree powfn = mathfn_built_in (type, BUILT_IN_POW);