_mm512_maskz_shuffle_i64x2
Classification
AVX-512, Swizzle, CPUID Test: AVX512F
Header File
Instruction
VSHUFI64X2 zmm {z}, zmm, zmm, imm8
Synopsis
_mm512_maskz_shuffle_i64x2(__mmask8 k, __m512i a, __m512i b, const int imm8);
Description
Shuffle 128-bits (composed of 2 64-bit integers) selected by "imm8" from "a" and "b", and store the results in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set).
Operation
DEFINE SELECT4(src, control) {
CASE(control[1:0]) OF
0: tmp[127:0] := src[127:0]
1: tmp[127:0] := src[255:128]
2: tmp[127:0] := src[383:256]
3: tmp[127:0] := src[511:384]
ESAC
RETURN tmp[127:0]
}
tmp_dst[127:0] := SELECT4(a[511:0], imm8[1:0])
tmp_dst[255:128] := SELECT4(a[511:0], imm8[3:2])
tmp_dst[383:256] := SELECT4(b[511:0], imm8[5:4])
tmp_dst[511:384] := SELECT4(b[511:0], imm8[7:6])
FOR j := 0 to 7
i := j*64
IF k[j]
dst[i+63:i] := tmp_dst[i+63:i]
ELSE
dst[i+63:i] := 0
FI
ENDFOR
dst[MAX:512] := 0