http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54717
--- Comment #17 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2012-11-15 15:07:33 UTC --- > Is the slowdown still reproducing with my patch? Most of it (if not all) is gone with the patch: 23.96s with '-fprotect-parens -Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -fwhole-program -flto' compared to 23.37s with '-fprotect-parens -Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -fwhole-program -flto -fno-tree-loop-if-convert'.