_mm256_maskz_permutexvar_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VPERMPD ymm {z}, ymm, ymm
Synopsis
_mm256_maskz_permutexvar_pd(__mmask8 k, __m256i idx, __m256d a);
Description
Shuffle double-precision (64-bit) floating-point elements in "a" across lanes using the corresponding index in "idx", and store the results in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set).
Operation
FOR j := 0 to 3
i := j*64
id := idx[i+1:i]*64
IF k[j]
dst[i+63:i] := a[id+63:id]
ELSE
dst[i+63:i] := 0
FI
ENDFOR
dst[MAX:256] := 0