_mm512_maskz_rsqrt28_pd
Classification
AVX-512, Elementary Math Functions, CPUID Test: AVX512ER
Header File
Instruction
VRSQRT28PD zmm {z}, zmm
Synopsis
_mm512_maskz_rsqrt28_pd(__mmask8 k, __m512d a);
Description
Compute the approximate reciprocal square root of packed double-precision (64-bit) floating-point elements in "a", 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^-28.
Operation
FOR j := 0 to 7
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