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Add options for forcing AVX and AVX2 instructions (#7334)

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Summary:
This PR is set up to merge into master, but it would be great to get this into a patch release if possible.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7334

Reviewed By: jay-zhuang

Differential Revision: D23476624

Pulled By: pdillinger

fbshipit-source-id: c6cc02ce06e779e1e174ab0f4748e557d2ce7bc6
This commit is contained in:
Daniel Smith 2020-09-03 08:02:39 -07:00 committed by Facebook GitHub Bot
parent 61d5a132c9
commit a09c3cf13e
1 changed files with 18 additions and 0 deletions
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18
CMakeLists.txt
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@ -254,12 +254,30 @@ endif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
option(PORTABLE "build a portable binary" OFF)
option(FORCE_SSE42 "force building with SSE4.2, even when PORTABLE=ON" OFF)
option(FORCE_AVX "force building with AVX, even when PORTABLE=ON" OFF)
option(FORCE_AVX2 "force building with AVX2, even when PORTABLE=ON" OFF)
if(PORTABLE)
# MSVC does not need a separate compiler flag to enable SSE4.2; if nmmintrin.h
# is available, it is available by default.
if(FORCE_SSE42 AND NOT MSVC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.2 -mpclmul")
endif()
if(MSVC)
if(FORCE_AVX)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX")
endif()
# MSVC automatically enables BMI / lzcnt with AVX2.
if(FORCE_AVX2)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX2")
endif()
else()
if(FORCE_AVX)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx")
endif()
if(FORCE_AVX2)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx2 -mbmi -mlzcnt")
endif()
endif()
else()
if(MSVC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX2")