_mm512_mask_shuffle_i32x4
Classification
AVX-512, Swizzle, CPUID Test: AVX512F
Header File
Instruction
VSHUFI32X4 zmm {k}, zmm, zmm, imm8
Synopsis
_mm512_mask_shuffle_i32x4(__m512i src, __mmask16 k, __m512i a, __m512i b, const int imm8);
Description
Shuffle 128-bits (composed of 4 32-bit integers) selected by "imm8" from "a" and "b", and store the results in "dst" using writemask "k" (elements are copied from "src" 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 15
i := j*32
IF k[j]
dst[i+31:i] := tmp_dst[i+31:i]
ELSE
dst[i+31:i] := src[i+31:i]
FI
ENDFOR
dst[MAX:512] := 0