_mm512_mask_rsqrt28_ps
Classification
AVX-512, Elementary Math Functions, CPUID Test: AVX512ER
Header File
immintrin.h
Instruction
VRSQRT28PS zmm {k}, zmm
Synopsis
 _mm512_mask_rsqrt28_ps(__m512 src, __mmask16 k, __m512 a);
Description
Compute the approximate reciprocal square root of packed single-precision (32-bit) floating-point elements in "a", 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.
Operation
FOR j := 0 to 15
	i := j*32
	IF k[j]
		dst[i+31:i] := (1.0 / SQRT(a[i+31:i]))
	ELSE
		dst[i+31:i] := src[i+31:i]
	FI
ENDFOR