Opcode/Instruction | Op/En | 64/32-bit Mode | CPUID Feature Flag | Description |
---|---|---|---|---|
66 0F 3A DF /r ib AESKEYGENASSIST xmm1, xmm2/m128, imm8 | RMI | V/V | AES | Assist in AES round key generation using an 8 bits Round Constant (RCON) specified in the immediate byte, operating on 128 bits of data specified in xmm2/m128 and stores the result in xmm1. |
VEX.128.66.0F3A.WIG DF /r ib VAESKEYGENASSIST xmm1, xmm2/m128, imm8 | RMI | V/V | Both AES and AVX flags | Assist in AES round key generation using 8 bits Round Constant (RCON) specified in the immediate byte, operating on 128 bits of data specified in xmm2/m128 and stores the result in xmm1. |
Op/En | Operand 1 | Operand2 | Operand3 | Operand4 |
RMI | ModRM:reg (w) | ModRM:r/m (r) | imm8 | NA |
Assist in expanding the AES cipher key, by computing steps towards generating a round key for encryption, using 128-bit data specified in the source operand and an 8-bit round constant specified as an immediate, store the result in the destination operand.
The destination operand is an XMM register. The source operand can be an XMM register or a 128-bit memory loca-tion.
128-bit Legacy SSE version: Bits (VLMAX-1:128) of the corresponding YMM destination register remain unchanged.
VEX.128 encoded version: Bits (VLMAX-1:128) of the destination YMM register are zeroed.
Note: In VEX-encoded versions, VEX.vvvv is reserved and must be 1111b, otherwise instructions will #UD.
AESKEYGENASSIST
X3[31:0] ← SRC [127: 96]; X2[31:0] ← SRC [95: 64]; X1[31:0] ← SRC [63: 32]; X0[31:0] ← SRC [31: 0]; RCON[31:0] ← ZeroExtend(Imm8[7:0]); DEST[31:0] ← SubWord(X1); DEST[63:32 ] ← RotWord( SubWord(X1) ) XOR RCON; DEST[95:64] ← SubWord(X3); DEST[127:96] ← RotWord( SubWord(X3) ) XOR RCON; DEST[VLMAX-1:128] (Unmodified)
VAESKEYGENASSIST
X3[31:0] (cid:197) SRC [127: 96]; X2[31:0] (cid:197) SRC [95: 64]; X1[31:0] (cid:197) SRC [63: 32]; X0[31:0] (cid:197) SRC [31: 0]; RCON[31:0] (cid:197) ZeroExtend(Imm8[7:0]); DEST[31:0] (cid:197) SubWord(X1); DEST[63:32 ] (cid:197) RotWord( SubWord(X1) ) XOR RCON; DEST[95:64] (cid:197) SubWord(X3); DEST[127:96] (cid:197) RotWord( SubWord(X3) ) XOR RCON; DEST[VLMAX-1:128] (cid:197) 0;
(V)AESKEYGENASSIST:
__m128i _mm_aeskeygenassist (__m128i, const int)
None
See Exceptions Type 4; additionally
#UD | If VEX.vvvv ≠ 1111B. |