_mm512_mask_getexp_round_pd
Classification
KNC, Miscellaneous, CPUID Test: KNCNI
Header File
Instruction
VGETEXPPD zmm {k}, zmm {sae}
Synopsis
_mm512_mask_getexp_round_pd(__m512d src, __mmask8 k, __m512d a, int sae);
Description
Convert the exponent of each packed double-precision (64-bit) floating-point element in "a" to a double-precision (64-bit) floating-point number representing the integer exponent, and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set). This intrinsic essentially calculates "floor(log2(x))" for each element.
[sae_note]
Operation
FOR j := 0 to 7
i := j*64
IF k[j]
dst[i+63:i] := ConvertExpFP64(a[i+63:i])
ELSE
dst[i+63:i] := src[i+63:i]
FI
ENDFOR
dst[MAX:512] := 0