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[Bug tree-optimization/71921] missed vectorization optimization
- From: "glisse at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 19 Jul 2016 05:42:57 +0000
- Subject: [Bug tree-optimization/71921] missed vectorization optimization
- Auto-submitted: auto-generated
- References: <bug-71921-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71921
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|libstdc++ |tree-optimization
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
That's not a libstdc++ issue, more likely tree-optimization, rtl-optimization
or target. The compiler already notices that the if/return construct is
equivalent to the ?: one (ifcvt). And the loop is vectorized (cmpltps+andnps).
Now gimple passes and the target (or some RTL pass) don't seem to agree on when
it is safe to replace ?: with MAX (or maybe the target is inconsistent between
scalars and vectors).