_mm_maskz_permutevar_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VPERMILPD xmm {z}, xmm, xmm
Synopsis
_mm_maskz_permutevar_pd(__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 zeromask "k" (elements are zeroed out 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] := 0
FI
ENDFOR
dst[MAX:128] := 0