_mm_maskz_shuffle_epi32
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VPSHUFD xmm {z}, xmm, imm8
Synopsis
_mm_maskz_shuffle_epi32(__mmask8 k, __m128i a, _MM_PERM_ENUM imm8);
Description
Shuffle 32-bit integers in "a" using the control in "imm8", 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[31:0] := src[31:0]
1: tmp[31:0] := src[63:32]
2: tmp[31:0] := src[95:64]
3: tmp[31:0] := src[127:96]
ESAC
RETURN tmp[31:0]
}
tmp_dst[31:0] := SELECT4(a[127:0], imm8[1:0])
tmp_dst[63:32] := SELECT4(a[127:0], imm8[3:2])
tmp_dst[95:64] := SELECT4(a[127:0], imm8[5:4])
tmp_dst[127:96] := SELECT4(a[127:0], imm8[7:6])
FOR j := 0 to 3
i := j*32
IF k[j]
dst[i+31:i] := tmp_dst[i+31:i]
ELSE
dst[i+31:i] := 0
FI
ENDFOR
dst[MAX:128] := 0