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Wasm SIMD intrinsics #8559

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Merged
merged 19 commits into from
Jun 26, 2019
Merged

Wasm SIMD intrinsics #8559

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902b2a0
Initial commit of intrinsics and test
tlively Apr 4, 2019
1c515fc
Get intrinsic tests compiling with -msimd128
tlively May 7, 2019
9e27daa
Merge remote-tracking branch 'origin/incoming' into wasm-simd-intrinsics
tlively May 7, 2019
cfa587d
Fix tests and unimplemented-simd128 build
tlively May 7, 2019
bc0bdcb
Finish implementing instructions and clean up
tlively May 8, 2019
e5b2704
Add explicit alignments and make load and store unaligned
tlively May 9, 2019
7ddcfaa
Add const to loaded pointer
tlively May 13, 2019
922f5ad
Merge branch 'incoming' of github.com:emscripten-core/emscripten into…
tlively Jun 4, 2019
b7a32a5
Rewrite intrinsics to expose only v128_t
tlively Jun 7, 2019
4bf50a0
Address recent comments
tlively Jun 19, 2019
13ddb55
Add v128.const intrinsics for all types
tlively Jun 19, 2019
1684a94
Fix some codegen inefficiencies
tlively Jun 20, 2019
e45481d
Use __builtin_constant_p in wasm_*_const
tlively Jun 23, 2019
96b5445
Add documentation
tlively Jun 24, 2019
659808c
Add stability disclaimer
tlively Jun 24, 2019
98972ec
Rename to wasm_simd128.h
tlively Jun 25, 2019
e4cc6b1
Add wasm_*_make convenience functions
tlively Jun 25, 2019
d187f30
Merge branch 'incoming' of github.com:emscripten-core/emscripten into…
tlively Jun 25, 2019
bc8494d
Fix whitespace
tlively Jun 25, 2019
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8 changes: 7 additions & 1 deletion site/source/docs/porting/simd.rst
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Expand Up @@ -6,7 +6,13 @@ Porting SIMD code targeting WebAssembly

Emscripten supports the `WebAssembly SIMD proposal <https://github.com/webassembly/simd/>`_ when using the WebAssembly LLVM backend. To enable SIMD, pass the -msimd128 flag at compile time. This will also turn on LLVM's autovectorization passes, so no source modifications are necessary to benefit from SIMD.

At the source level, the GCC/Clang `SIMD Vector Extensions <https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html>`_ can be used and will be lowered to WebAssembly SIMD instructions where possible. A portable intrinsics header for WebAssembly SIMD is also being actively developed.
At the source level, the GCC/Clang `SIMD Vector Extensions <https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html>`_ can be used and will be lowered to WebAssembly SIMD instructions where possible. In addition, there is a portable intrinsics header file that can be used.

.. code-block:: cpp

#include <wasm_simd128.h>

Separate documentation for the intrinsics header is a work in progress, but its usage is straightforward and its source can be found at `wasm_simd128.h <https://github.com/emscripten-core/emscripten/blob/master/system/include/wasm_simd128.h>`. These intrinsics are under active development in parallel with the SIMD proposal and should not be considered any more stable than the proposal itself.

WebAssembly SIMD is not supported when using the Fastcomp backend.

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