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Add preliminary support of targeting Wasm

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This builds on the work on portable-intrinsics branch:

- define WEBP_ENABLE_WASM_SIMD to enable WebAssembly optimizations, this
defines a constant (WEBP_USE_WASM_SIMD) that we can use in the future to
enable Wasm SIMD intrinsics
- build dwebp with JS build
- add a placeholder dec_wasm.c file, we don't do any special
initialization so it will fall back to c functions
- add Wasm to cpu checks, it needs to come before all checks since the
Emscripten toolchain will emulate x86 systems

Change-Id: I12de720304ff19fff82c8d100defbc60353787a9
This commit is contained in:
Zhi An Ng
2021-11-05 09:34:44 -07:00
parent 6b1d18c362
commit ed665a15e8
8 changed files with 81 additions and 10 deletions
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3
cmake/config.h.in
View File

@ -108,6 +108,9 @@
/* Set to 1 if JPEG library is installed */
#cmakedefine WEBP_HAVE_JPEG 1
/* Set to 1 if Wasm SIMD is supported */
#cmakedefine WEBP_HAVE_WASM_SIMD
/* Set to 1 if NEON is supported */
#cmakedefine WEBP_HAVE_NEON

16
cmake/cpu.cmake
View File

@ -36,9 +36,9 @@ function(webp_check_compiler_flag WEBP_SIMD_FLAG ENABLE_SIMD)
endfunction()
# those are included in the names of WEBP_USE_* in c++ code.
set(WEBP_SIMD_FLAGS "SSE41;SSE2;MIPS32;MIPS_DSP_R2;NEON;MSA")
set(WEBP_SIMD_FLAGS "WASM_SIMD;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")
"_wasm.c;_sse41.c;_sse2.c;_mips32.c;_mips_dsp_r2.c;_neon.c;_msa.c")
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
@ -53,9 +53,9 @@ if(MSVC AND CMAKE_C_COMPILER_ID STREQUAL "MSVC")
set(SIMD_DISABLE_FLAGS)
else()
set(SIMD_ENABLE_FLAGS
"-msse4.1;-msse2;-mips32;-mdspr2;-mfpu=neon;-mmsa")
"-msimd128;-msse4.1;-msse2;-mips32;-mdspr2;-mfpu=neon;-mmsa")
set(SIMD_DISABLE_FLAGS
"-mno-sse4.1;-mno-sse2;;-mno-dspr2;;-mno-msa")
"-mno-simd128;-mno-sse4.1;-mno-sse2;;-mno-dspr2;;-mno-msa")
endif()
set(WEBP_SIMD_FILES_TO_NOT_INCLUDE)
@ -77,7 +77,12 @@ math(EXPR WEBP_SIMD_FLAGS_RANGE "${WEBP_SIMD_FLAGS_LENGTH} - 1")
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)
if(EMSCRIPTEN AND ${I_SIMD} GREATER_EQUAL 5)
break()
endif()
# Emscripten supports SSE via compat headers, if WEBP_ENABLED_WASM_SIMD is
# specified skip testing those (because it will succeed).
if (EMSCRIPTEN AND ${I_SIMD} GREATER_EQUAL 1 AND ${WEBP_ENABLE_WASM_SIMD})
break()
endif()
@ -91,6 +96,7 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
if(NOT WEBP_HAVE_${WEBP_SIMD_FLAG})
list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
# This enables using Emscripten's SSE compatibility headers.
if(EMSCRIPTEN)
set(SIMD_COMPILE_FLAG "-msimd128 ${SIMD_COMPILE_FLAG}")
endif()