From 4d8b88e8f2eecec56b16736f27e708ec20a222cb Mon Sep 17 00:00:00 2001 From: Richard Guenther Date: Mon, 10 Oct 2011 14:25:34 +0000 Subject: [PATCH] re PR middle-end/50195 (Linking time error with -fast-math -O0) 2011-10-10 Richard Guenther 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 --- gcc/ChangeLog | 6 ++++++ gcc/fold-const.c | 4 ++-- gcc/testsuite/ChangeLog | 5 +++++ gcc/testsuite/gcc.dg/builtins-47.c | 2 +- 4 files changed, 14 insertions(+), 3 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a28c1e2337a..1c78a676c14 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2011-10-10 Richard Guenther + + 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 PR middle-end/49801 diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 7568c6f143a..5b0fea7b1ba 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -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); diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d0700e9b739..7d978b82a37 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2011-10-10 Richard Guenther + + PR middle-end/50195 + * gcc.dg/builtins-47.c: Optimize. + 2011-10-10 Aldy Hernandez * lib/gcc-simulate-thread.exp: New. diff --git a/gcc/testsuite/gcc.dg/builtins-47.c b/gcc/testsuite/gcc.dg/builtins-47.c index b25ee1b9958..9513483cf30 100644 --- a/gcc/testsuite/gcc.dg/builtins-47.c +++ b/gcc/testsuite/gcc.dg/builtins-47.c @@ -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); -- 2.30.2