http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58359
Anatoly Sinyavin <a.sinyavin at samsung dot com> changed:
What |Removed |Added
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CC| |a.sinyavin at samsung dot com
--- Comment #3 from Anatoly Sinyavin <a.sinyavin at samsung dot com> ---
__builtin_unreachable is processed by "fab" optimization pass (fold all
builtins / tree-ssa-ccp.c) in optimize_unreachable function. This pass is
executed after vectorization so vectorizer gets __builtin_unreachable.
Moreover __builtin_unreachable processing is one of the last pass on
gimple. It leads that __builtin_unreachable can prevent not only vectorization
but also many others optimization.
So I suggest processing __builtin_unreachable immediately after "cfg" pass
(cfg buiding).
If we don't have any objections I can make patch for this problem.
