_mm_mask_unpacklo_epi8
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512BW
Header File
Instruction
VPUNPCKLBW xmm {k}, xmm, xmm
Synopsis
_mm_mask_unpacklo_epi8(__m128i src, __mmask16 k, __m128i a, __m128i b);
Description
Unpack and interleave 8-bit integers from the low half of "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 INTERLEAVE_BYTES(src1[127:0], src2[127:0]) {
dst[7:0] := src1[7:0]
dst[15:8] := src2[7:0]
dst[23:16] := src1[15:8]
dst[31:24] := src2[15:8]
dst[39:32] := src1[23:16]
dst[47:40] := src2[23:16]
dst[55:48] := src1[31:24]
dst[63:56] := src2[31:24]
dst[71:64] := src1[39:32]
dst[79:72] := src2[39:32]
dst[87:80] := src1[47:40]
dst[95:88] := src2[47:40]
dst[103:96] := src1[55:48]
dst[111:104] := src2[55:48]
dst[119:112] := src1[63:56]
dst[127:120] := src2[63:56]
RETURN dst[127:0]
}
tmp_dst[127:0] := INTERLEAVE_BYTES(a[127:0], b[127:0])
FOR j := 0 to 15
i := j*8
IF k[j]
dst[i+7:i] := tmp_dst[i+7:i]
ELSE
dst[i+7:i] := src[i+7:i]
FI
ENDFOR
dst[MAX:128] := 0