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[Bug rtl-optimization/78120] [6/7 Regression] If conversion no longer performed
- From: "jgreenhalgh at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 11 Nov 2016 16:12:47 +0000
- Subject: [Bug rtl-optimization/78120] [6/7 Regression] If conversion no longer performed
- Auto-submitted: auto-generated
- References: <bug-78120-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78120
James Greenhalgh <jgreenhalgh at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |ktkachov at gcc dot gnu.org
--- Comment #5 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
If this is a 6 regression it may be more likely related to Kyrill's work on
if-converting arithmetic instructions ( r227368 and follow-ups) than my cost
work (which only landed for GCC 7) - though I'm sure my cost work won't have
helped as the impact of my changes would likely cause less if-conversion for
x86, which reports branches as cheap and conditional moves as expensive.
My ifcvt work for GCC 6 was more related to multiple sets in a basic block,
which I don't think this testcase requires.