_mm_maskz_rcp28_sd
Classification
AVX-512, Elementary Math Functions, CPUID Test: AVX512ER
Header File
immintrin.h
Instruction
VRCP28SD xmm {z}, xmm, xmm
Synopsis
 _mm_maskz_rcp28_sd(__mmask8 k, __m128d a, __m128d b);
Description
Compute the approximate reciprocal of the lower double-precision (64-bit) floating-point element in "b", store the result in the lower element of "dst" using zeromask "k" (the element is zeroed out when mask bit 0 is not set), and copy the upper element from "a" to the upper element of "dst". The maximum relative error for this approximation is less than 2^-28.
Operation
IF k[0]
	dst[63:0] := (1.0 / b[63:0])
ELSE
	dst[63:0] := 0
FI
dst[127:64] := a[127:64]
dst[MAX:128] := 0