_mm256_mask_unpacklo_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VUNPCKLPD ymm {k}, ymm, ymm
Synopsis
_mm256_mask_unpacklo_pd(__m256d src, __mmask8 k, __m256d a, __m256d b);
Description
Unpack and interleave double-precision (64-bit) floating-point elements from the low half of each 128-bit lane in "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_QWORDS(src1[127:0], src2[127:0]) {
dst[63:0] := src1[63:0]
dst[127:64] := src2[63:0]
RETURN dst[127:0]
}
tmp_dst[127:0] := INTERLEAVE_QWORDS(a[127:0], b[127:0])
tmp_dst[255:128] := INTERLEAVE_QWORDS(a[255:128], b[255:128])
FOR j := 0 to 3
i := j*64
IF k[j]
dst[i+63:i] := tmp_dst[i+63:i]
ELSE
dst[i+63:i] := src[i+63:i]
FI
ENDFOR
dst[MAX:256] := 0