_mm_scalef_ss
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VSCALEFSS xmm, xmm, xmm
Synopsis
 _mm_scalef_ss(__m128 a, __m128 b);
Description
Scale the packed single-precision (32-bit) floating-point elements in "a" using values from "b", store the result in the lower element of "dst", and copy the upper 3 packed elements from "a" to the upper elements 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[31:0] := tmp_src1[31:0] * POW(2.0, FLOOR(tmp_src2[31:0]))
	RETURN dst[63:0]
}
dst[31:0] := SCALE(a[31:0], b[31:0])
dst[127:32] := a[127:32]
dst[MAX:128] := 0