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<div style="font-family:Calibri,sans-serif; font-size:11pt">Have you run cpu2006 for x86-64 for perf progression/regression ?<br>
<br>
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<span style="font-family:Calibri,sans-serif; font-size:11pt; font-weight:bold">From:
</span><span style="font-family:Calibri,sans-serif; font-size:11pt"><a href="mailto:llvm-dev@lists.llvm.org">Charlie Turner via llvm-dev</a></span><br>
<span style="font-family:Calibri,sans-serif; font-size:11pt; font-weight:bold">Sent:
</span><span style="font-family:Calibri,sans-serif; font-size:11pt">ý11/ý9/ý2015 11:15 PM</span><br>
<span style="font-family:Calibri,sans-serif; font-size:11pt; font-weight:bold">To:
</span><span style="font-family:Calibri,sans-serif; font-size:11pt"><a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a></span><br>
<span style="font-family:Calibri,sans-serif; font-size:11pt; font-weight:bold">Subject:
</span><span style="font-family:Calibri,sans-serif; font-size:11pt">[llvm-dev] [RFC][SLP] Let's turn -slp-vectorize-hor on by default</span><br>
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<div class="PlainText">I've done compile-time experiments for AArch64 over SPEC{2000,2006}<br>
and of course the test-suite. I measure no significant compile-time<br>
impact of enabling this feature by default.<br>
<br>
I also ran the test-suite on an X86-64 machine. I can't imagine any<br>
other targets being uniquely effected in terms of compile-time by<br>
turning this on after testing both AArch64 and X86-64. I also timed<br>
running the regression tests with -slp-vectorize-hor enabled and<br>
disabled, no significant difference here either.<br>
<br>
There are no significant performance regressions (or much<br>
improvements) on AArch64 in night-test suite. I do see wins in third<br>
party benchmarks when using this flag, which is why I'm asking if<br>
there would be any objection from the community to making<br>
-slp-vectorize-hor default on.<br>
<br>
I have run the regression tests and looked through the bug tracker /<br>
VC logs, I can't see any reason for not enabling it.<br>
<br>
Thanks,<br>
Charlie.<br>
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