_mm512_mask_rcp28_round_pd
Classification
AVX-512, Elementary Math Functions, CPUID Test: AVX512ER
Header File
immintrin.h
Instruction
VRCP28PD zmm {k}, zmm {sae}
Synopsis
 _mm512_mask_rcp28_round_pd(__m512d src, __mmask8 k, __m512d a, int sae);
Description
Compute the approximate reciprocal of packed double-precision (64-bit) floating-point elements in "a", and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set). The maximum relative error for this approximation is less than 2^-28. [sae_note]
Operation
FOR j := 0 to 7
	i := j*64
	IF k[j]
		dst[i+63:i] := (1.0 / a[i+63:i])
	ELSE
		dst[i+63:i] := src[i+63:i]
	FI
ENDFOR