_mm_mask_max_round_sd
Classification
AVX-512, Special Math Functions, CPUID Test: AVX512F
Header File
Instruction
VMAXSD xmm {k}, xmm, xmm {sae}
Synopsis
_mm_mask_max_round_sd(__m128d src, __mmask8 k, __m128d a, __m128d b, int sae);
Description
Compare the lower double-precision (64-bit) floating-point elements in "a" and "b", store the maximum value in the lower element of "dst" using writemask "k" (the element is copied from "src" when mask bit 0 is not set), and copy the upper element from "a" to the upper element of "dst". [sae_note][max_float_note]
Operation
IF k[0]
dst[63:0] := MAX(a[63:0], b[63:0])
ELSE
dst[63:0] := src[63:0]
FI
dst[127:64] := a[127:64]
dst[MAX:128] := 0