_mm_maskz_rsqrt_sh
Classification
AVX-512, Elementary Math Functions, CPUID Test: AVX512_FP16
Header File
immintrin.h
Instruction
VRSQRTSH xmm {z}, xmm, xmm
Synopsis
 _mm_maskz_rsqrt_sh(__mmask8 k, __m128h a, __m128h b);
Description
Compute the approximate reciprocal square root of the lower half-precision (16-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 7 packed elements from "a" to the upper elements of "dst". The maximum relative error for this approximation is less than 1.5*2^-12.
Operation
IF k[0]
	dst.fp16[0] := (1.0 / SQRT(b.fp16[0]))
ELSE
	dst.fp16[0] := 0
FI
dst[127:16] := a[127:16]
dst[MAX:128] := 0