_mm_getmant_sd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VGETMANTSD xmm, xmm, xmm, imm8
Synopsis
 _mm_getmant_sd(__m128d a, __m128d b, _MM_MANTISSA_NORM_ENUM interv, _MM_MANTISSA_SIGN_ENUM sc);
Description
Normalize the mantissas of the lower double-precision (64-bit) floating-point element in "b", store the result in the lower element of "dst", and copy the upper element from "a" to the upper element of "dst". This intrinsic essentially calculates "±(2^k)*|x.significand|", where "k" depends on the interval range defined by "interv" and the sign depends on "sc" and the source sign. [getmant_note]
Operation
dst[63:0] := GetNormalizedMantissa(b[63:0], sc, interv)
dst[127:64] := a[127:64]
dst[MAX:128] := 0