_mm_mask_scalef_ss
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VSCALEFSS xmm {k}, xmm, xmm
Synopsis
_mm_mask_scalef_ss(__m128 src, __mmask8 k, __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" using writemask "k" (the element is copied from "src" when mask bit 0 is not set), 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]
}
IF k[0]
dst[31:0] := SCALE(a[31:0], b[31:0])
ELSE
dst[31:0] := src[31:0]
FI
dst[127:32] := a[127:32]
dst[MAX:128] := 0