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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/66002] paq8p benchmark 50% slower than clang on sandybridge
Date: Mon, 04 May 2015 12:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66002

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
gprof tells me

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
 67.13     25.40    25.40  2097192     0.00     0.00  contextModel2()
 18.08     32.24     6.84 18874735     0.00     0.00  ContextMap::mix1(Mixer&,
int, int, int, int)
  9.46     35.82     3.58  2097192     0.00     0.00  Mixer::p()
  2.72     36.85     1.03 14680344     0.00     0.00  APM1::p(int, int, int)
  0.53     37.05     0.20  2097192     0.00     0.00  dmcModel(Mixer&)

probably not too interesting (inlining).


I wonder if you can run clang++ with vectorization disabled?