_mm_maskz_getexp_ss
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VGETEXPSS xmm {z}, xmm, xmm
Synopsis
 _mm_maskz_getexp_ss(__mmask8 k, __m128 a, __m128 b);
Description
Convert the exponent of the lower single-precision (32-bit) floating-point element in "b" to a single-precision (32-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 3 packed elements from "a" to the upper elements of "dst". This intrinsic essentially calculates "floor(log2(x))" for the lower element.
Operation
IF k[0]
	dst[31:0] := ConvertExpFP32(b[31:0])
ELSE
	dst[31:0] := 0
FI
dst[127:32] := a[127:32]
dst[MAX:128] := 0