_mm256_maskz_rsqrt14_pd
Classification
AVX-512, Arithmetic, CPUID Test: AVX512F
Header File
Instruction
VRSQRT14PD ymm {z}, ymm
Synopsis
_mm256_maskz_rsqrt14_pd(__mmask8 k, __m256d a);
Description
Compute the approximate reciprocal square root of packed double-precision (64-bit) floating-point elements in "a", and store the results in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set). The maximum relative error for this approximation is less than 2^-14.
Operation
FOR j := 0 to 3
i := j*64
IF k[j]
dst[i+63:i] := (1.0 / SQRT(a[i+63:i]))
ELSE
dst[i+63:i] := 0
FI
ENDFOR
dst[MAX:256] := 0