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[Bug target/80232] Ofast pessimizes Sparse matmult in scimark2 benchmark on avx platforms
- From: "vincenzo.innocente at cern dot ch" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 30 Mar 2017 12:13:14 +0000
- Subject: [Bug target/80232] Ofast pessimizes Sparse matmult in scimark2 benchmark on avx platforms
- Auto-submitted: auto-generated
- References: <bug-80232-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80232
--- Comment #5 from vincenzo Innocente <vincenzo.innocente at cern dot ch> ---
I confirm that gather is almost twice as fast on
Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
w/r/t
Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
(used a benchmark version of PR80248 example)
so on skylake, knl, (and hopefully on skylake-avx512) is profitable,
on Haswell and broardwell is not...