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# Handle files that need special SIMD-related flags.
#
# This function adds the passed source files to the given target only if the SIMD specific condition
# evaluates to true. It also adds the SIMD architecture specific flags as compile options to those
# source files.
#
# Arguments
# NAME: is deprecated, don't use it.
# SIMD: name of the simd architecture, e.g. sse2, avx, neon. A Qt feature named QT_FEATURE_foo
# should exist, as well as QT_CFLAGS_foo assignment in QtCompilerOptimization.cmake.
# COMPILE_FLAGS: extra compile flags to set for the passed source files
# EXCLUDE_OSX_ARCHITECTURES: On apple platforms, specifies which architectures should not get the
# SIMD compiler flags. This is mostly relevant for fat / universal builds
#
function(qt_internal_add_simd_part target)
qt_parse_all_arguments(arg "qt_add_simd_part" "" "NAME;SIMD"
"${__default_private_args};COMPILE_FLAGS;EXCLUDE_OSX_ARCHITECTURES" ${ARGN})
if ("x${arg_SIMD}" STREQUAL x)
message(FATAL_ERROR "qt_add_simd_part needs a SIMD type to be set.")
endif()
set(condition "QT_FEATURE_${arg_SIMD}")
string(TOUPPER "QT_CFLAGS_${arg_SIMD}" simd_flags_var_name)
set(simd_flags_expanded "")
# As per mkspecs/features/simd.prf, the arch_haswell SIMD compiler is enabled when
# qmake's CONFIG contains "avx2", which maps to CMake's QT_FEATURE_avx2.
# The list of dependencies 'avx2 bmi bmi2 f16c fma lzcnt popcnt' only influences whether
# the 'arch_haswell' SIMD flags need to be added explicitly to the compiler invocation.
# If the compiler adds them implicitly, they must be present in qmake's QT_CPU_FEATURES as
# detected by the architecture test, and thus they are present in TEST_subarch_result.
if("${arg_SIMD}" STREQUAL arch_haswell)
set(condition "QT_FEATURE_avx2")
# Use avx2 flags as per simd.prf, if there are no specific arch_haswell flags specified in
# QtCompilerOptimization.cmake.
if("${simd_flags_var_name}" STREQUAL "")
set(simd_flags_var_name "QT_CFLAGS_AVX2")
endif()
# The avx512 profiles dependencies DO influence if the SIMD compiler will be executed,
# so each of the profile dependencies have to be in qmake's CONFIG for the compiler to be
# enabled, which means the CMake features have to evaluate to true.
# Also the profile flags to be used are a combination of arch_haswell, avx512f and each of the
# dependencies.
elseif("${arg_SIMD}" STREQUAL avx512common)
set(condition "QT_FEATURE_avx512cd")
list(APPEND simd_flags_expanded "${QT_CFLAGS_ARCH_HASWELL}")
list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512F}")
list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512CD}")
list(REMOVE_DUPLICATES simd_flags_expanded)
elseif("${arg_SIMD}" STREQUAL avx512core)
set(condition "QT_FEATURE_avx512cd AND QT_FEATURE_avx512bw AND QT_FEATURE_avx512dq AND QT_FEATURE_avx512vl")
list(APPEND simd_flags_expanded "${QT_CFLAGS_ARCH_HASWELL}")
list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512F}")
list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512CD}")
list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512BW}")
list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512DQ}")
list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512VL}")
list(REMOVE_DUPLICATES simd_flags_expanded)
endif()
qt_evaluate_config_expression(result ${condition})
if(${result})
if(QT_CMAKE_DEBUG_EXTEND_TARGET)
message("qt_add_simd_part(${target} SIMD ${arg_SIMD} ...): Evaluated")
endif()
if(NOT simd_flags_expanded)
set(simd_flags_expanded "${${simd_flags_var_name}}")
endif()
# If requested, don't pass the simd specific flags to excluded arches on apple platforms.
# Mostly important for universal / fat builds.
get_target_property(osx_architectures ${target} OSX_ARCHITECTURES)
if(simd_flags_expanded AND osx_architectures AND arg_EXCLUDE_OSX_ARCHITECTURES)
list(REMOVE_ITEM osx_architectures ${arg_EXCLUDE_OSX_ARCHITECTURES})
# Assumes that simd_flags_expanded contains only one item on apple platforms.
list(TRANSFORM osx_architectures
REPLACE "^(.+)$" "-Xarch_\\1;${simd_flags_expanded}"
OUTPUT_VARIABLE simd_flags_expanded)
endif()
# The manual loop is done on purpose. Check Gerrit comments for
# 1b7008a3d784f3f266368f824cb43d473a301ba1.
foreach(source IN LISTS arg_SOURCES)
set_property(SOURCE "${source}" APPEND
PROPERTY COMPILE_OPTIONS
${simd_flags_expanded}
${arg_COMPILE_FLAGS}
)
endforeach()
set_source_files_properties(${arg_SOURCES} PROPERTIES SKIP_PRECOMPILE_HEADERS TRUE)
target_sources(${target} PRIVATE ${arg_SOURCES})
else()
if(QT_CMAKE_DEBUG_EXTEND_TARGET)
message("qt_add_simd_part(${target} SIMD ${arg_SIMD} ...): Skipped")
endif()
endif()
endfunction()
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