_mm256_maskz_getexp_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VGETEXPPD ymm {z}, ymm
Synopsis
_mm256_maskz_getexp_pd(__mmask8 k, __m256d a);
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 zeromask "k" (elements are zeroed out when the corresponding mask bit is not set). This intrinsic essentially calculates "floor(log2(x))" for each element.
Operation
FOR j := 0 to 3
i := j*64
IF k[j]
dst[i+63:i] := ConvertExpFP64(a[i+63:i])
ELSE
dst[i+63:i] := 0
FI
ENDFOR
dst[MAX:256] := 0