_mm256_permute2f128_pd
Classification
Header File
Instruction
VPERM2F128 ymm, ymm, ymm, imm8
Synopsis
_mm256_permute2f128_pd(__m256d a, __m256d b, int imm8);
Description
Shuffle 128-bits (composed of 2 packed double-precision (64-bit) floating-point elements) selected by "imm8" from "a" and "b", and store the results in "dst".
Operation
DEFINE SELECT4(src1, src2, control) {
CASE(control[1:0]) OF
0: tmp[127:0] := src1[127:0]
1: tmp[127:0] := src1[255:128]
2: tmp[127:0] := src2[127:0]
3: tmp[127:0] := src2[255:128]
ESAC
IF control[3]
tmp[127:0] := 0
FI
RETURN tmp[127:0]
}
dst[127:0] := SELECT4(a[255:0], b[255:0], imm8[3:0])
dst[255:128] := SELECT4(a[255:0], b[255:0], imm8[7:4])
dst[MAX:256] := 0