_mm512_mask_scalef_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VSCALEFPD zmm {k}, zmm, zmm
Synopsis
 _mm512_mask_scalef_pd(__m512d src, __mmask8 k, __m512d a, __m512d 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 7
	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:512] := 0