Canonicalize x*x to pow(x,2) only when optimizing which is when
we do optimized expansion.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2011-10-10 Richard Guenther <rguent...@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.
Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c (revision 179738)
+++ gcc/fold-const.c (working copy)
@@ -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);
Index: gcc/testsuite/gcc.dg/builtins-47.c
===================================================================
--- gcc/testsuite/gcc.dg/builtins-47.c (revision 179738)
+++ gcc/testsuite/gcc.dg/builtins-47.c (working copy)
@@ -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);
