| Opcode/Instruction | Op/En | 64/32-bit Mode | CPUID Feature Flag | Description |
|---|---|---|---|---|
| 66 0F 38 DD /r AESENCLAST xmm1, xmm2/m128 | RM | V/V | AES | Perform the last round of an AES encryption flow, operating on a 128-bit data (state) from xmm1 with a 128-bit round key from xmm2/m128. |
| VEX.NDS.128.66.0F38.WIG DD /r VAESENCLAST xmm1, xmm2, xmm3/m128 | RVM | V/V | Both AES and AVX flags | Perform the last round of an AES encryption flow, operating on a 128-bit data (state) from xmm2 with a 128 bit round key from xmm3/m128; store the result in xmm1. |
| Op/En | Operand 1 | Operand2 | Operand3 | Operand4 |
| RM | ModRM:reg (r, w) | ModRM:r/m (r) | NA | NA |
| RVM | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | NA |
This instruction performs the last round of an AES encryption flow using a round key from the second source operand, operating on 128-bit data (state) from the first source operand, and store the result in the destination operand.
128-bit Legacy SSE version: The first source operand and the destination operand are the same and must be an XMM register. The second source operand can be an XMM register or a 128-bit memory location. Bits (VLMAX-1:128) of the corresponding YMM destination register remain unchanged.
VEX.128 encoded version: The first source operand and the destination operand are XMM registers. The second source operand can be an XMM register or a 128-bit memory location. Bits (VLMAX-1:128) of the destination YMM register are zeroed.
AESENCLAST
STATE ← SRC1; RoundKey ← SRC2; STATE ← ShiftRows( STATE ); STATE ← SubBytes( STATE ); DEST[127:0] ← STATE XOR RoundKey; DEST[VLMAX-1:128] (Unmodified)
VAESENCLAST
STATE (cid:197) SRC1; RoundKey (cid:197) SRC2; STATE (cid:197) ShiftRows( STATE ); STATE (cid:197) SubBytes( STATE ); DEST[127:0] (cid:197) STATE XOR RoundKey; DEST[VLMAX-1:128] (cid:197) 0
(V)AESENCLAST:
__m128i _mm_aesenclast (__m128i, __m128i)
None
See Exceptions Type 4.