http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56125
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-01 14:17:58 UTC --- Author: jakub Date: Fri Feb 1 14:17:50 2013 New Revision: 195664 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195664 Log: Backported from mainline 2013-01-28 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/56125 * tree-ssa-math-opts.c (gimple_expand_builtin_pow): Don't optimize pow(x,c) into sqrt(x) * powi(x, n/2) or 1.0 / (sqrt(x) * powi(x, abs(n/2))) if c is an integer or when optimizing for size. Don't optimize pow(x,c) into powi(x, n/3) * powi(cbrt(x), n%3) or 1.0 / (powi(x, abs(n)/3) * powi(cbrt(x), abs(n)%3)) if 2c is an integer. * gcc.dg/pr56125.c: New test. Added: branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/pr56125.c Modified: branches/gcc-4_7-branch/gcc/ChangeLog branches/gcc-4_7-branch/gcc/testsuite/ChangeLog branches/gcc-4_7-branch/gcc/tree-ssa-math-opts.c
