Function llvmint::x86::avx512_mask_pmaddubs_w_256

pub unsafe extern "C" fn avx512_mask_pmaddubs_w_256(
    a: i8x32, 
    b: i8x32, 
    c: i16x16, 
    d: i16
) -> i16x16

The llvm.x86.avx512.mask.pmaddubs.w.256 intrinsic; known as __builtin_ia32_pmaddubsw256_mask in GCC.