_mm_mask_permutevar_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VPERMILPD xmm {k}, xmm, xmm
Synopsis
_mm_mask_permutevar_pd(__m128d src, __mmask8 k, __m128d a, __m128i b);
Description
Shuffle double-precision (64-bit) floating-point elements in "a" using the control in "b", and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set).
Operation
IF (b[1] == 0) tmp_dst[63:0] := a[63:0]; FI
IF (b[1] == 1) tmp_dst[63:0] := a[127:64]; FI
IF (b[65] == 0) tmp_dst[127:64] := a[63:0]; FI
IF (b[65] == 1) tmp_dst[127:64] := a[127:64]; FI
FOR j := 0 to 1
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:128] := 0