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Fix #4265: Add appropriate compiler defines and flags for SIMD with MSVC #4266

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Merged
merged 3 commits into from
May 21, 2024
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Fix #4265: Add appropriate compiler defines and flags for SIMD with MSVC #4266

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eb2bb98
Fix #4265: Add appropriate compiler defines and flags for SIMD with MSVC
jessey-git May 16, 2024
a07396d
MSVC actually defines the __AVX__ values though
jessey-git May 16, 2024
fc02817
Use SIMD_COMPILE_FLAGS
jessey-git May 21, 2024
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34 changes: 33 additions & 1 deletion src/cmake/compiler.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -327,11 +327,29 @@ if (NOT USE_SIMD STREQUAL "")
if (USE_SIMD STREQUAL "0")
set (SIMD_COMPILE_FLAGS ${SIMD_COMPILE_FLAGS} "-DOIIO_NO_SIMD=1")
else ()
set(_highest_msvc_arch 0)
string (REPLACE "," ";" SIMD_FEATURE_LIST ${USE_SIMD})
foreach (feature ${SIMD_FEATURE_LIST})
message (VERBOSE "SIMD feature: ${feature}")
if (MSVC OR CMAKE_COMPILER_IS_INTEL)
list (APPEND SIMD_COMPILE_FLAGS "/arch:${feature}")
if (feature STREQUAL "sse2")
list (APPEND SIMD_COMPILE_FLAGS "/D__SSE2__")
endif ()
if (feature STREQUAL "sse4.1")
list (APPEND SIMD_COMPILE_FLAGS "/D__SSE2__" "/D__SSE4_1__")
endif ()
if (feature STREQUAL "sse4.2")
list (APPEND SIMD_COMPILE_FLAGS "/D__SSE2__" "/D__SSE4_2__")
endif ()
if (feature STREQUAL "avx" AND _highest_msvc_arch LESS 1)
set(_highest_msvc_arch 1)
endif ()
if (feature STREQUAL "avx2" AND _highest_msvc_arch LESS 2)
set(_highest_msvc_arch 2)
endif ()
if (feature STREQUAL "avx512f" AND _highest_msvc_arch LESS 3)
set(_highest_msvc_arch 3)
endif ()
else ()
list (APPEND SIMD_COMPILE_FLAGS "-m${feature}")
endif ()
Expand All @@ -343,6 +361,20 @@ if (NOT USE_SIMD STREQUAL "")
proj_add_compile_options ("-ffp-contract=off")
endif ()
endforeach()

# Only add a single /arch flag representing the highest level of support.
if (MSVC OR CMAKE_COMPILER_IS_INTEL)
if (_highest_msvc_arch EQUAL 1)
list (APPEND SIMD_COMPILE_FLAGS "/arch:AVX")
endif ()
if (_highest_msvc_arch EQUAL 2)
list (APPEND SIMD_COMPILE_FLAGS "/arch:AVX2")
endif ()
if (_highest_msvc_arch EQUAL 3)
list (APPEND SIMD_COMPILE_FLAGS "/arch:AVX512")
endif ()
endif ()
unset(_highest_msvc_arch)
endif ()
proj_add_compile_options (${SIMD_COMPILE_FLAGS})
endif ()
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