VPERM2I128 — Permute Integer Values
| Opcode/Instruction | Op/En | 64/32 -bit Mode | CPUID Feature Flag | Description |
|---|---|---|---|---|
| VEX.256.66.0F3A.W0 46 /r ib VPERM2I128 ymm1, ymm2, ymm3/m256, imm8 | RVMI | V/V | AVX2 | Permute 128-bit integer data in ymm2 and ymm3/mem using controls from imm8 and store result in ymm1. |
Instruction Operand Encoding ¶
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
| RVMI | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | imm8 |
Description ¶
Permute 128 bit integer data from the first source operand (second operand) and second source operand (third operand) using bits in the 8-bit immediate and store results in the destination operand (first operand). The first source operand is a YMM register, the second source operand is a YMM register or a 256-bit memory location, and the destination operand is a YMM register.
Imm8[1:0] select the source for the first destination 128-bit field, imm8[5:4] select the source for the second destination field. If imm8[3] is set, the low 128-bit field is zeroed. If imm8[7] is set, the high 128-bit field is zeroed.
VEX.L must be 1, otherwise the instruction will #UD.
Operation ¶
VPERM2I128 ¶
CASE IMM8[1:0] of 0: DEST[127:0] := SRC1[127:0] 1: DEST[127:0] := SRC1[255:128] 2: DEST[127:0] := SRC2[127:0] 3: DEST[127:0] := SRC2[255:128] ESAC CASE IMM8[5:4] of 0: DEST[255:128] := SRC1[127:0] 1: DEST[255:128] := SRC1[255:128] 2: DEST[255:128] := SRC2[127:0] 3: DEST[255:128] := SRC2[255:128] ESAC IF (imm8[3]) DEST[127:0] := 0 FI IF (imm8[7]) DEST[255:128] := 0 FI
Intel C/C++ Compiler Intrinsic Equivalent ¶
VPERM2I128: __m256i _mm256_permute2x128_si256 (__m256i a, __m256i b, int control)
SIMD Floating-Point Exceptions ¶
None
Other Exceptions ¶
See Table 2-23, “Type 6 Class Exception Conditions.”
Additionally:
| #UD | If VEX.L = 0, |
| If VEX.W = 1. |