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From "Impala Public Jenkins (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-6291: disable AVX512 codegen in LLVM
Date Sat, 09 Dec 2017 03:45:02 GMT
Impala Public Jenkins has submitted this change and it was merged. (

Change subject: IMPALA-6291: disable AVX512 codegen in LLVM

IMPALA-6291: disable AVX512 codegen in LLVM

Adds a whitelist of LLVM CPU attributes that I know that we routinely
test Impala with. This excludes the problematic AVX512 attributes as
well as some other flags we don't test with - e.g. AMD-only
instructions, NVM-related instructions, etc. We're unlikely to get
significant benefit from these instruction set extensions without
explicitly using them via instrinsics.

Ran core tests on a system with AVX512 support with a prototype patch
that disabled only the AVX512 flags. Added a backend test to make sure
that the whitelisting is working as expected.

Change-Id: Ic7c3ee3e370bafc50d855113485b7e6925f7bf6a
Reviewed-by: Tim Armstrong <>
Tested-by: Impala Public Jenkins
M be/src/codegen/
M be/src/codegen/
M be/src/codegen/llvm-codegen.h
3 files changed, 71 insertions(+), 2 deletions(-)

  Tim Armstrong: Looks good to me, approved
  Impala Public Jenkins: Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ic7c3ee3e370bafc50d855113485b7e6925f7bf6a
Gerrit-Change-Number: 8802
Gerrit-PatchSet: 6
Gerrit-Owner: Tim Armstrong <>
Gerrit-Reviewer: Impala Public Jenkins
Gerrit-Reviewer: Jim Apple <>
Gerrit-Reviewer: Michael Ho <>
Gerrit-Reviewer: Tim Armstrong <>

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