How to run wasm simd by V8 of arm64.debug?

[Yahan Lu]

I build simd.cc :

#include <wasm_simd128.h>

int fun(v128_t a,v128_t b) {

  v128_t prod = wasm_i32x4_add(a, b);

  return prod[0];

}

int main() {

  v128_t a = {1,2,3,4};

  v128_t b = {5,4,6,8};

  return fun(a,b);

}

Build it:

emcc -msimd128 -O3 foo.c -o foo.js

And run 

./arm64.debug/d8 ./foo.js  --experimental-wasm-simd --print-code

But i don't find any Neon instr in code that be printed by v8?

I remeber it can work on January 2021.

[Yahan Lu]

Oh sorry . I can't build it by O3.

[Zhi An Ng]

I guess you figured it out, everything is optimized away.

You can put a EMSCRIPTEN KEEPALIVE (https://emscripten.org/docs/api_reference/emscripten.h.html#c.EMSCRIPTEN_KEEPALIVE) on "fun" and it should prevent it from being optimized (don't even need to call it).

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Best,

Zhi An