[Bug tree-optimization/56309] -O3 optimizer generates conditional moves instead of compare and branch resulting in almost 2x slower code

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309



--- Comment #17 from Uros Bizjak <ubizjak at gmail dot com> 2013-02-14 17:49:46 
UTC ---

(In reply to comment #16)



> And it executed fast:

> 

> ./by-val-O3-flags

> Took 6.74 seconds total.



The solution to all these PRs is trivial: kill -ftree-loop-if-convert on x86,

until infrastructure to detect possible stalls is implemented. This decision

needs lots of benchmarking, though.