which clang source of bf16 GEMM kernel

[WeiMa01]

Which source path called for BF16 GEMM kernel(vbfdotq_f32)?

1. system clang path: /usr/lib/llvm-14/lib/clang/14.0.0/include/arm_neon.h
2. clang of android ndk path: /android-ndk-r27c/toolchains/llvm/prebuilt/linux-x86_64/lib/clang/18/include/arm_neon.h

cc @larryliu0820 @manuelcandales

[metascroy]

@WeiMa01 can you provide more details?

Maybe @swolchok knows?

[swolchok]

https://github.com/search?q=repo%3Apytorch%2Fexecutorch%20vbfdotq_f32&type=code

[WeiMa01]

https://github.com/search?q=repo%3Apytorch%2Fexecutorch%20vbfdotq_f32&type=code

yes, it's function f32_dot_bf16 called vbfdotq_f32 , However I want to konw what's vbfdotq_f32 called other ?

1. system clang path: /usr/lib/llvm-14/lib/clang/14.0.0/include/arm_neon.h
   _#ifdef LITTLE_ENDIAN
   __ai float32x4_t vbfdotq_f32(float32x4_t __p0, bfloat16x8_t __p1, bfloat16x8_t __p2) {
   float32x4_t __ret;
   __ret = (float32x4_t) __builtin_neon_vbfdotq_v((int8x16_t)__p0, (int8x16_t)__p1, (int8x16_t)__p2, 41);
   return _ret;
   }
2. clang of android ndk path: /android-ndk-r27c/toolchains/llvm/prebuilt/linux-x86_64/lib/clang/18/include/arm_neon.h
   _ifdef LITTLE_ENDIAN
   __ai attribute((target("bf16"))) float32x4_t vbfdotq_f32(float32x4_t __p0, bfloat16x8_t __p1, bfloat16x8_t __p2) {
   float32x4_t __ret;
   __ret = (float32x4_t) __builtin_neon_vbfdotq_f32((int8x16_t)__p0, (int8x16_t)__p1, (int8x16_t)__p2, 41);
   return _ret;
   }