_mm_scalef_sd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VSCALEFSD xmm, xmm, xmm
Synopsis
 _mm_scalef_sd(__m128d a, __m128d b);
Description
Scale the packed double-precision (64-bit) floating-point elements in "a" using values from "b", store the result in the lower element of "dst", and copy the upper element from "a" to the upper element of "dst".
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]
}
dst[63:0] := SCALE(a[63:0], b[63:0])
dst[127:64] := a[127:64]
dst[MAX:128] := 0