_mm_permutevar_ps
Classification
Header File
Instruction
VPERMILPS xmm, xmm, xmm
Synopsis
_mm_permutevar_ps(__m128 a, __m128i b);
Description
Shuffle single-precision (32-bit) floating-point elements in "a" using the control in "b", and store the results in "dst".
Operation
DEFINE SELECT4(src, control) {
CASE(control[1:0]) OF
0: tmp[31:0] := src[31:0]
1: tmp[31:0] := src[63:32]
2: tmp[31:0] := src[95:64]
3: tmp[31:0] := src[127:96]
ESAC
RETURN tmp[31:0]
}
dst[31:0] := SELECT4(a[127:0], b[1:0])
dst[63:32] := SELECT4(a[127:0], b[33:32])
dst[95:64] := SELECT4(a[127:0], b[65:64])
dst[127:96] := SELECT4(a[127:0], b[97:96])
dst[MAX:128] := 0