_mm_maskz_getexp_round_sd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VGETEXPSD xmm {z}, xmm, xmm {sae}
Synopsis
 _mm_maskz_getexp_round_sd(__mmask8 k, __m128d a, __m128d b, int sae);
Description
Convert the exponent of the lower double-precision (64-bit) floating-point element in "b" to a double-precision (64-bit) floating-point number representing the integer exponent, 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". This intrinsic essentially calculates "floor(log2(x))" for the lower element. [sae_note]
Operation
IF k[0]
	dst[63:0] := ConvertExpFP64(b[63:0])
ELSE
	dst[63:0] := 0
FI
dst[127:64] := a[127:64]
dst[MAX:128] := 0