| Class ID | Number of Registers | Size of Registers | Register Alignment | Registers |
|---|---|---|---|---|
| 1 | 1 | 4 | 4 | 23 |
| 2 | 16 | 4 | 4 | 96 - 97 - 104 - 105 - 106 - 107 - 108 - 109 |
| 3 | 16 | 8 | 8 | 96 - 97 - 104 - 105 - 106 - 107 - 108 - 109 |
| 4 | 16 | 2 | 2 | 3 - 11 - 16 - 84 - 13 - 8 - 6 |
| 5 | 4 | 2 | 2 | 3 - 11 - 16 - 8 |
| 6 | 16 | 4 | 4 | 17 - 20 - 22 - 25 - 21 - 19 - 18 |
| 7 | 4 | 4 | 4 | 17 - 20 - 22 - 19 |
| 8 | 16 | 8 | 8 | 75 - 78 - 80 - 82 - 79 - 67 - 71 - 43 - 47 - 77 - 59 - 63 - 51 - 55 - 76 |
| 9 | 20 | 1 | 1 | 2 - 10 - 15 - 1 - 9 - 12 - 5 - 4 |
| 10 | 7 | 4 | 4 | 27 - 28 - 29 - 30 - 31 - 32 - 33 |
| 11 | 7 | 8 | 4 | 27 - 28 - 29 - 30 - 31 - 32 - 33 |
| 12 | 7 | 10 | 4 | 27 - 28 - 29 - 30 - 31 - 32 - 33 |
| 13 | 8 | 8 | 4 | |
| 14 | 16 | 16 | 16 | 96 - 97 - 104 - 105 - 106 - 107 - 108 - 109 |
| 15 | 8 | 8 | 8 | 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 |
The register numbering is as follows:
1: AH 2: AL 3: AX 4: BH 5: BL
6: BP 7: BPL 8: BX 9: CH 10: CL
11: CX 12: DH 13: DI 14: DIL 15: DL
16: DX 17: EAX 18: EBP 19: EBX 20: ECX
21: EDI 22: EDX 23: EFLAGS 24: EIP 25: ESI
26: ESP 27: FP0 28: FP1 29: FP2 30: FP3
31: FP4 32: FP5 33: FP6 34: IP 35: MM0
36: MM1 37: MM2 38: MM3 39: MM4 40: MM5
41: MM6 42: MM7 43: R10 44: R10B 45: R10D
46: R10W 47: R11 48: R11B 49: R11D 50: R11W
51: R12 52: R12B 53: R12D 54: R12W 55: R13
56: R13B 57: R13D 58: R13W 59: R14 60: R14B
61: R14D 62: R14W 63: R15 64: R15B 65: R15D
66: R15W 67: R8 68: R8B 69: R8D 70: R8W
71: R9 72: R9B 73: R9D 74: R9W 75: RAX
76: RBP 77: RBX 78: RCX 79: RDI 80: RDX
81: RIP 82: RSI 83: RSP 84: SI 85: SIL
86: SP 87: SPL 88: ST(0) 89: ST(1) 90: ST(2)
91: ST(3) 92: ST(4) 93: ST(5) 94: ST(6) 95: ST(7)
96: XMM0 97: XMM1 98: XMM10 99: XMM11 100: XMM12
101: XMM13 102: XMM14 103: XMM15 104: XMM2 105: XMM3
106: XMM4 107: XMM5 108: XMM6 109: XMM7 110: XMM8