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cmake: Improve the microarch checks

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This commit is contained in:
Matthew Barr 2017-06-07 11:16:30 +10:00
parent a6f4394959
commit 73765f1f84
2 changed files with 43 additions and 17 deletions
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15
CMakeLists.txt
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@ -253,6 +253,11 @@ else()
set(EXTRA_CXX_FLAGS "${EXTRA_CXX_FLAGS} -Wno-abi")
endif ()
if (CMAKE_C_COMPILER_ID MATCHES "Intel")
set(SKYLAKE_FLAG "-xCORE-AVX512")
else ()
set(SKYLAKE_FLAG "-march=skylake-avx512")
endif ()
endif()
CHECK_INCLUDE_FILES(unistd.h HAVE_UNISTD_H)
@ -306,10 +311,6 @@ endif ()
include (${CMAKE_MODULE_PATH}/arch.cmake)
if (NOT FAT_RUNTIME AND NOT HAVE_SSSE3)
message(FATAL_ERROR "A minimum of SSSE3 compiler support is required")
endif ()
# testing a builtin takes a little more work
CHECK_C_SOURCE_COMPILES("void *aa_test(void *x) { return __builtin_assume_aligned(x, 16);}\nint main(void) { return 0; }" HAVE_CC_BUILTIN_ASSUME_ALIGNED)
CHECK_CXX_SOURCE_COMPILES("void *aa_test(void *x) { return __builtin_assume_aligned(x, 16);}\nint main(void) { return 0; }" HAVE_CXX_BUILTIN_ASSUME_ALIGNED)
@ -460,12 +461,6 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EXTRA_CXX_FLAGS}")
endif()
if(CMAKE_C_COMPILER_ID MATCHES "Intel")
set(SKYLAKE_FLAG "-xCORE-AVX512")
else()
set(SKYLAKE_FLAG "-march=skylake-avx512")
endif()
if(NOT WIN32)
set(RAGEL_C_FLAGS "-Wno-unused")
endif()

45
cmake/arch.cmake
View File

@ -10,8 +10,24 @@ else ()
message (FATAL_ERROR "No intrinsics header found")
endif ()
if (BUILD_AVX512)
CHECK_C_COMPILER_FLAG(${SKYLAKE_FLAG} HAS_ARCH_SKYLAKE)
if (NOT HAS_ARCH_SKYLAKE)
message (FATAL_ERROR "AVX512 not supported by compiler")
endif ()
endif ()
set (CMAKE_REQUIRED_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS} ${ARCH_C_FLAGS}")
if (FAT_RUNTIME)
# test the highest level microarch to make sure everything works
if (BUILD_AVX512)
set (CMAKE_REQUIRED_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS} ${SKYLAKE_FLAG}")
else ()
set (CMAKE_REQUIRED_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS} -march=core-avx2")
endif ()
else (NOT FAT_RUNTIME)
# if not fat runtime, then test given cflags
set (CMAKE_REQUIRED_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS} ${ARCH_C_FLAGS}")
endif ()
# ensure we have the minimum of SSSE3 - call a SSSE3 intrinsic
CHECK_C_SOURCE_COMPILES("#include <${INTRIN_INC_H}>
@ -31,10 +47,6 @@ int main(){
(void)_mm256_xor_si256(z, z);
}" HAVE_AVX2)
if (NOT HAVE_AVX2)
message(STATUS "Building without AVX2 support")
endif ()
# and now for AVX512
CHECK_C_SOURCE_COMPILES("#include <${INTRIN_INC_H}>
#if !defined(__AVX512BW__)
@ -46,8 +58,27 @@ int main(){
(void)_mm512_abs_epi8(z);
}" HAVE_AVX512)
if (NOT HAVE_AVX512)
message(STATUS "Building without AVX512 support")
if (FAT_RUNTIME)
if (NOT HAVE_SSSE3)
message(FATAL_ERROR "SSSE3 support required to build fat runtime")
endif ()
if (NOT HAVE_AVX2)
message(FATAL_ERROR "AVX2 support required to build fat runtime")
endif ()
if (BUILD_AVX512 AND NOT HAVE_AVX512)
message(FATAL_ERROR "AVX512 support requested but not supported")
endif ()
else (NOT FAT_RUNTIME)
if (NOT HAVE_AVX2)
message(STATUS "Building without AVX2 support")
endif ()
if (NOT HAVE_AVX512)
message(STATUS "Building without AVX512 support")
endif ()
else (NOT FAT_RUNTIME)
if (NOT HAVE_SSSE3)
message(FATAL_ERROR "A minimum of SSSE3 compiler support is required")
endif ()
endif ()
unset (CMAKE_REQUIRED_FLAGS)