_mm512_rsqrt28_round_pd
Classification
AVX-512, Elementary Math Functions, CPUID Test: AVX512ER
Header File
immintrin.h
Instruction
VRSQRT28PD zmm, zmm {sae}
Synopsis
 _mm512_rsqrt28_round_pd(__m512d a, int sae);
Description
Compute the approximate reciprocal square root of packed double-precision (64-bit) floating-point elements in "a", store the results in "dst". The maximum relative error for this approximation is less than 2^-28. [sae_note]
Operation
FOR j := 0 to 7
	i := j*64
	dst[i+63:i] := (1.0 / SQRT(a[i+63:i]))
ENDFOR