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Merge "cmake: fix per-file assembly flags"

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This commit is contained in:
James Zern 2020-12-02 19:29:21 +00:00 committed by Gerrit Code Review
commit fef789f366
1 changed files with 33 additions and 30 deletions
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63
cmake/cpu.cmake
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@ -31,9 +31,17 @@ endfunction()
set(WEBP_SIMD_FLAGS "SSE41;SSE2;MIPS32;MIPS_DSP_R2;NEON;MSA")
set(WEBP_SIMD_FILE_EXTENSIONS
"_sse41.c;_sse2.c;_mips32.c;_mips_dsp_r2.c;_neon.c;_msa.c")
if(MSVC)
# MSVC does not have a SSE4 flag but AVX support implies SSE4 support.
set(SIMD_ENABLE_FLAGS "/arch:AVX;/arch:SSE2;;;;")
if(MSVC AND CMAKE_C_COMPILER_ID STREQUAL "MSVC")
# With at least Visual Studio 12 (2013)+ /arch is not necessary to build SSE2
# or SSE4 code unless a lesser /arch is forced. MSVC does not have a SSE4
# flag, but an AVX one. Using that with SSE4 code risks generating illegal
# instructions when used on machines with SSE4 only. The flags are left for
# older (untested) versions to avoid any potential compatibility issues.
if(MSVC_VERSION GREATER_EQUAL 1800 AND NOT CMAKE_C_FLAGS MATCHES "/arch:")
set(SIMD_ENABLE_FLAGS)
else()
set(SIMD_ENABLE_FLAGS "/arch:AVX;/arch:SSE2;;;;")
endif()
set(SIMD_DISABLE_FLAGS)
else()
set(SIMD_ENABLE_FLAGS
@ -57,9 +65,14 @@ endif()
list(LENGTH WEBP_SIMD_FLAGS WEBP_SIMD_FLAGS_LENGTH)
math(EXPR WEBP_SIMD_FLAGS_RANGE "${WEBP_SIMD_FLAGS_LENGTH} - 1")
unset(HIGHEST_SSE_FLAG)
foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
# With Emscripten 2.0.9 -msimd128 -mfpu=neon will enable NEON, but the
# source will fail to compile.
if(EMSCRIPTEN AND ${I_SIMD} GREATER_EQUAL 2)
break()
endif()
list(GET WEBP_SIMD_FLAGS ${I_SIMD} WEBP_SIMD_FLAG)
# First try with no extra flag added as the compiler might have default flags
@ -67,43 +80,33 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
unset(WEBP_HAVE_${WEBP_SIMD_FLAG} CACHE)
cmake_push_check_state()
set(CMAKE_REQUIRED_FLAGS)
if(NOT simd_found)
webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
if(NOT WEBP_HAVE_${WEBP_SIMD_FLAG})
list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
if(EMSCRIPTEN)
set(SIMD_COMPILE_FLAG "-msimd128 ${SIMD_COMPILE_FLAG}")
endif()
set(CMAKE_REQUIRED_FLAGS ${SIMD_COMPILE_FLAG})
webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
else()
if(MSVC)
list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
else()
set(SIMD_COMPILE_FLAG " ")
endif()
webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
if(NOT WEBP_HAVE_${WEBP_SIMD_FLAG})
list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
if(EMSCRIPTEN)
set(SIMD_COMPILE_FLAG "-msimd128 ${SIMD_COMPILE_FLAG}")
endif()
set(CMAKE_REQUIRED_FLAGS ${SIMD_COMPILE_FLAG})
webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
else()
if(MSVC AND SIMD_ENABLE_FLAGS)
# The detection for SSE2/SSE4 support under MSVC is based on the compiler
# version so e.g., clang-cl will require flags to enable the assembly.
list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
else()
set(SIMD_COMPILE_FLAG " ")
endif()
elseif(${I_SIMD} LESS 2)
set(WEBP_HAVE_${WEBP_SIMD_FLAG} 1)
endif()
# Check which files we should include or not.
list(GET WEBP_SIMD_FILE_EXTENSIONS ${I_SIMD} WEBP_SIMD_FILE_EXTENSION)
file(GLOB SIMD_FILES "${CMAKE_CURRENT_LIST_DIR}/../"
"src/dsp/*${WEBP_SIMD_FILE_EXTENSION}")
if(WEBP_HAVE_${WEBP_SIMD_FLAG})
if(${I_SIMD} LESS 2 AND NOT HIGHEST_SSE_FLAG)
set(HIGHEST_SSE_FLAG ${SIMD_COMPILE_FLAG})
endif()
# Memorize the file and flags.
foreach(FILE ${SIMD_FILES})
list(APPEND WEBP_SIMD_FILES_TO_INCLUDE ${FILE})
if(${I_SIMD} LESS 2)
list(APPEND WEBP_SIMD_FLAGS_TO_INCLUDE ${HIGHEST_SSE_FLAG})
else()
list(APPEND WEBP_SIMD_FLAGS_TO_INCLUDE ${SIMD_COMPILE_FLAG})
endif()
list(APPEND WEBP_SIMD_FLAGS_TO_INCLUDE ${SIMD_COMPILE_FLAG})
endforeach()
set(simd_found 1)
else()
# Remove the file from the list.
foreach(FILE ${SIMD_FILES})