Function llvmint::x86::avx512_mask_pmaddw_d_256

pub unsafe extern "C" fn avx512_mask_pmaddw_d_256(
    a: i16x16, 
    b: i16x16, 
    c: i32x8, 
    d: i8
) -> i32x8

The llvm.x86.avx512.mask.pmaddw.d.256 intrinsic; known as __builtin_ia32_pmaddwd256_mask in GCC.