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'.

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