https://github.com/halide/Halide
* Support using V8 as the Wasm JIT interpreter This is a partial revert of https://github.com/halide/Halide/pull/5097. It brings back a bunch of the code in WasmExecutor to set up and use V8 to run Wasm code. All of the code is copy-pasted. There are some small cleanups to move common code (like BDMalloc, structs, asserts) to a common area guarded by `if WITH_WABT || WITH_V8`. Enabling V8 requires setting 2 CMake options: - V8_INCLUDE_PATH - V8_LIB_PATH The first is a path to v8 include folder, to find headers, the second is the monolithic v8 library. This is because it's pretty difficult to build v8, and there are various flags you can set. Comments around those options provide some instructions for building v8. By default, we still use the wabt for running Wasm code, but we can use V8 by setting WITH_WABT=OFF WITH_V8=ON. Maybe in the future, with more testing, we can flip this. Right now this requires a locally patched build of V8 due to https://crbug.com/v8/10461, but once that is resolved, the version of V8 that includes the fix will be fine. Also enable a single test, block_transpose, to run on V8, with these results: $ HL_JIT_TARGET=wasm-32-wasmrt-wasm_simd128 \ ./test/performance/performance_block_transpose Dummy Func version: Scalar transpose bandwidth 3.45061e+08 byte/s. Wrapper version: Scalar transpose bandwidth 3.38931e+08 byte/s. Dummy Func version: Transpose vectorized in y bandwidth 6.74143e+08 byte/s. Wrapper version: Transpose vectorized in y bandwidth 3.54331e+08 byte/s. Dummy Func version: Transpose vectorized in x bandwidth 3.50053e+08 byte/s. Wrapper version: Transpose vectorized in x bandwidth 6.73421e+08 byte/s. Success! For comparison, when targeting host: $ ./test/performance/performance_block_transpose Dummy Func version: Scalar transpose bandwidth 1.33689e+09 byte/s. Wrapper version: Scalar transpose bandwidth 1.33583e+09 byte/s. Dummy Func version: Transpose vectorized in y bandwidth 2.20278e+09 byte/s. Wrapper version: Transpose vectorized in y bandwidth 1.45959e+09 byte/s. Dummy Func version: Transpose vectorized in x bandwidth 1.45921e+09 byte/s. Wrapper version: Transpose vectorized in x bandwidth 2.21746e+09 byte/s. Success! For comparison, running with wabt: Dummy Func version: Scalar transpose bandwidth 828715 byte/s. Wrapper version: Scalar transpose bandwidth 826204 byte/s. Dummy Func version: Transpose vectorized in y bandwidth 1.12008e+06 byte/s. Wrapper version: Transpose vectorized in y bandwidth 874958 byte/s. Dummy Func version: Transpose vectorized in x bandwidth 879031 byte/s. Wrapper version: Transpose vectorized in x bandwidth 1.10525e+06 byte/s. Success! * Add instructions to build V8 * Formatting * More documentation * Update README_webassembly.md * Update README_webassembly.md * Update WasmExecutor.cpp * Update WasmExecutor.cpp * Skip tests * Update WasmExecutor.cpp * Skip performance tests * Update WasmExecutor.cpp * Address review comments * 9.8.147 -> 9.8.177 Co-authored-by: Ng Zhi An <zhin@google.com>
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