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[libc][NFC] Make cpu feature check tolerate non-x86 architectures. 

The feature check should probably be enhanced for non-x86 architectures,
but this change shields them from x86 specific pieces until then.

This patch has been split out from https://reviews.llvm.org/D81533.
This commit is contained in:
Siva Chandra 2020-06-10 10:55:00 -07:00 committed by Siva Chandra Reddy
parent 8b6821a584
commit c76a1d0fc0
1 changed files with 9 additions and 3 deletions
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12
libc/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
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@ -4,10 +4,9 @@
if(${LIBC_TARGET_MACHINE} MATCHES "x86|x86_64")
set(ALL_CPU_FEATURES SSE SSE2 AVX AVX2 AVX512F)
list(SORT ALL_CPU_FEATURES)
endif()
list(SORT ALL_CPU_FEATURES)
# Function to check whether the host supports the provided set of features.
# Usage:
# host_supports(
@ -126,4 +125,11 @@ function(_check_defined_cpu_feature output_var)
endfunction()
# Populates the HOST_CPU_FEATURES list.
_check_defined_cpu_feature(HOST_CPU_FEATURES MARCH native)
# Use -march=native only when the compiler supports it.
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
_check_defined_cpu_feature(HOST_CPU_FEATURES MARCH native)
else()
_check_defined_cpu_feature(HOST_CPU_FEATURES)
endif()