Function llvmint::x86::avx512_mask_vpermi2var_pd_256

pub unsafe extern "C" fn avx512_mask_vpermi2var_pd_256(
    a: f64x4, 
    b: i64x4, 
    c: f64x4, 
    d: i8
) -> f64x4

The llvm.x86.avx512.mask.vpermi2var.pd.256 intrinsic; known as __builtin_ia32_vpermi2varpd256_mask in GCC.