_mm512_permutex_pd
Classification
AVX-512, Swizzle, CPUID Test: AVX512F
Header File
Instruction
VPERMPD zmm, zmm, imm8
Synopsis
_mm512_permutex_pd(__m512d a, const int imm8);
Description
Shuffle double-precision (64-bit) floating-point elements in "a" within 256-bit lanes using the control in "imm8", and store the results in "dst".
Operation
DEFINE SELECT4(src, control) {
CASE(control[1:0]) OF
0: tmp[63:0] := src[63:0]
1: tmp[63:0] := src[127:64]
2: tmp[63:0] := src[191:128]
3: tmp[63:0] := src[255:192]
ESAC
RETURN tmp[63:0]
}
dst[63:0] := SELECT4(a[255:0], imm8[1:0])
dst[127:64] := SELECT4(a[255:0], imm8[3:2])
dst[191:128] := SELECT4(a[255:0], imm8[5:4])
dst[255:192] := SELECT4(a[255:0], imm8[7:6])
dst[319:256] := SELECT4(a[511:256], imm8[1:0])
dst[383:320] := SELECT4(a[511:256], imm8[3:2])
dst[447:384] := SELECT4(a[511:256], imm8[5:4])
dst[511:448] := SELECT4(a[511:256], imm8[7:6])
dst[MAX:512] := 0