_mm256_mask_scalef_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VSCALEFPD ymm {k}, ymm, ymm
Synopsis
_mm256_mask_scalef_pd(__m256d src, __mmask8 k, __m256d a, __m256d b);
Description
Scale the packed double-precision (64-bit) floating-point elements in "a" using values from "b", and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set).
Operation
DEFINE SCALE(src1, src2) {
IF (src2 == NaN)
IF (src2 == SNaN)
RETURN QNAN(src2)
FI
ELSE IF (src1 == NaN)
IF (src1 == SNaN)
RETURN QNAN(src1)
FI
IF (src2 != INF)
RETURN QNAN(src1)
FI
ELSE
tmp_src2 := src2
tmp_src1 := src1
IF (IS_DENORMAL(src2) AND MXCSR.DAZ)
tmp_src2 := 0
FI
IF (IS_DENORMAL(src1) AND MXCSR.DAZ)
tmp_src1 := 0
FI
FI
dst[63:0] := tmp_src1[63:0] * POW(2.0, FLOOR(tmp_src2[63:0]))
RETURN dst[63:0]
}
FOR j := 0 to 3
i := j*64
IF k[j]
dst[i+63:i] := SCALE(a[i+63:0], b[i+63:i])
ELSE
dst[i+63:i] := src[i+63:i]
FI
ENDFOR
dst[MAX:256] := 0