SIB byte
| r32/r64 | rAX | rCX | rDX | rBX | SS:rSP | #1 | rSI | rDI | |||||||||
| r32/r64 with REX.B=1 | r8 | r9 | r10 | r11 | r12 | #2 | r14 | r15 | |||||||||
| r32/r64 with REX2/EVEX.B=0 and REX2/EVEX.B'=1 | r16 | r17 | r18 | r19 | r20 | #3 | r22 | r23 | |||||||||
| r32/r64 with REX2/EVEX.B=1 and REX2/EVEX.B'=1 | r24 | r25 | r26 | r27 | r28 | #4 | r30 | r31 | |||||||||
| base= base= |
0 000 |
1 001 |
2 010 |
3 011 |
4 100 |
5 101 |
6 110 |
7 111 |
|||||||||
| scaled index |
S | index | value of SIB byte (hex) | ||||||||||||||
| traditional | VSIB |
||||||||||||||||
| REX2/EVEX.X'=0 | REX2/EVEX.X'=1 | MVEX/EVEX.v'=0 (not X') | MVEX/EVEX.v'=1 (not X') | ||||||||||||||
| REX.X=0 | REX.X=1 | REX2/EVEX.X=0 | REX2/EVEX.X=1 | MVEX/EVEX.X=0 | MVEX/EVEX.X=1 | MVEX/EVEX.X=0 | MVEX/EVEX.X=1 | ||||||||||
| [rAX*1+base] [rCX*1+base] [rDX*1+base] [rBX*1+base] [none*1+base] [rBP*1+base] [rSI*1+base] [rDI*1+base] |
[r8*1+base] [r9*1+base] [r10*1+base] [r11*1+base] [r12*1+base] [r13*1+base] [r14*1+base] [r15*1+base] |
[r16*1+base] [r17*1+base] [r18*1+base] [r19*1+base] [r20*1+base] [r21*1+base] [r22*1+base] [r23*1+base] |
[r24*1+base] [r25*1+base] [r26*1+base] [r27*1+base] [r28*1+base] [r29*1+base] [r30*1+base] [r31*1+base] |
[?MM0*1+base] [?MM1*1+base] [?MM2*1+base] [?MM3*1+base] [?MM4*1+base] [?MM5*1+base] [?MM6*1+base] [?MM7*1+base] |
[?MM8*1+base] [?MM9*1+base] [?MM10*1+base] [?MM11*1+base] [?MM12*1+base] [?MM13*1+base] [?MM14*1+base] [?MM15*1+base] |
[?MM16*1+base] [?MM17*1+base] [?MM18*1+base] [?MM19*1+base] [?MM20*1+base] [?MM21*1+base] [?MM22*1+base] [?MM23*1+base] |
[?MM24*1+base] [?MM25*1+base] [?MM26*1+base] [?MM27*1+base] [?MM28*1+base] [?MM29*1+base] [?MM30*1+base] [?MM31*1+base] |
00 |
000 001 010 011 100 101 110 111 |
00 08 10 18 20 28 30 38 |
01 09 11 19 21 29 31 39 |
02 0A 12 1A 22 2A 32 3A |
03 0B 13 1B 23 2B 33 3B |
04 0C 14 1C 24 2C 34 3C |
05 0D 15 1D 25 2D 35 3D |
06 0E 16 1E 26 2E 36 3E |
07 0F 17 1F 27 2F 37 3F |
| [rAX*2+base] [rCX*2+base] [rDX*2+base] [rBX*2+base] [none*2+base] [rBP*2+base] [rSI*2+base] [rDI*2+base] |
[r8*2+base] [r9*2+base] [r10*2+base] [r11*2+base] [r12*2+base] [r13*2+base] [r14*2+base] [r15*2+base] |
[r16*2+base] [r17*2+base] [r18*2+base] [r19*2+base] [r20*2+base] [r21*2+base] [r22*2+base] [r23*2+base] |
[r24*2+base] [r25*2+base] [r26*2+base] [r27*2+base] [r28*2+base] [r29*2+base] [r30*2+base] [r31*2+base] |
[?MM0*2+base] [?MM1*2+base] [?MM2*2+base] [?MM3*2+base] [?MM4*2+base] [?MM5*2+base] [?MM6*2+base] [?MM7*2+base] |
[?MM8*2+base] [?MM9*2+base] [?MM10*2+base] [?MM11*2+base] [?MM12*2+base] [?MM13*2+base] [?MM14*2+base] [?MM15*2+base] |
[?MM16*2+base] [?MM17*2+base] [?MM18*2+base] [?MM19*2+base] [?MM20*2+base] [?MM21*2+base] [?MM22*2+base] [?MM23*2+base] |
[?MM24*2+base] [?MM25*2+base] [?MM26*2+base] [?MM27*2+base] [?MM28*2+base] [?MM29*2+base] [?MM30*2+base] [?MM31*2+base] |
01 |
000 001 010 011 100 101 110 111 |
40 48 50 58 60 68 70 78 |
41 49 51 59 61 69 71 79 |
42 4A 52 5A 62 6A 72 7A |
43 4B 53 5B 63 6B 73 7B |
44 4C 54 5C 64 6C 74 7C |
45 4D 55 5D 65 6D 75 7D |
46 4E 56 5E 66 6E 76 7E |
47 4F 57 5F 67 6F 77 7F |
| [rAX*4+base] [rCX*4+base] [rDX*4+base] [rBX*4+base] [none*4+base] [rBP*4+base] [rSI*4+base] [rDI*4+base] |
[r8*4+base] [r9*4+base] [r10*4+base] [r11*4+base] [r12*4+base] [r13*4+base] [r14*4+base] [r15*4+base] |
[r16*4+base] [r17*4+base] [r18*4+base] [r19*4+base] [r20*4+base] [r21*4+base] [r22*4+base] [r23*4+base] |
[r24*4+base] [r25*4+base] [r26*4+base] [r27*4+base] [r28*4+base] [r29*4+base] [r30*4+base] [r31*4+base] |
[?MM0*4+base] [?MM1*4+base] [?MM2*4+base] [?MM3*4+base] [?MM4*4+base] [?MM5*4+base] [?MM6*4+base] [?MM7*4+base] |
[?MM8*4+base] [?MM9*4+base] [?MM10*4+base] [?MM11*4+base] [?MM12*4+base] [?MM13*4+base] [?MM14*4+base] [?MM15*4+base] |
[?MM16*4+base] [?MM17*4+base] [?MM18*4+base] [?MM19*4+base] [?MM20*4+base] [?MM21*4+base] [?MM22*4+base] [?MM23*4+base] |
[?MM24*4+base] [?MM25*4+base] [?MM26*4+base] [?MM27*4+base] [?MM28*4+base] [?MM29*4+base] [?MM30*4+base] [?MM31*4+base] |
10 |
000 001 010 011 100 101 110 111 |
80 88 90 98 A0 A8 B0 B8 |
81 89 91 99 A1 A9 B1 B9 |
82 8A 92 9A A2 AA B2 BA |
83 8B 93 9B A3 AB B3 BB |
84 8C 94 9C A4 AC B4 BC |
85 8D 95 9D A5 AD B5 BD |
86 8E 96 9E A6 AE B6 BE |
87 8F 97 9F A7 AF B7 BF |
| [rAX*8+base] [rCX*8+base] [rDX*8+base] [rBX*8+base] [none*8+base] [rBP*8+base] [rSI*8+base] [rDI*8+base] |
[r8*8+base] [r9*8+base] [r10*8+base] [r11*8+base] [r12*8+base] [r13*8+base] [r14*8+base] [r15*8+base] |
[r16*8+base] [r17*8+base] [r18*8+base] [r19*8+base] [r20*8+base] [r21*8+base] [r22*8+base] [r23*8+base] |
[r24*8+base] [r25*8+base] [r26*8+base] [r27*8+base] [r28*8+base] [r29*8+base] [r30*8+base] [r31*8+base] |
[?MM0*8+base] [?MM1*8+base] [?MM2*8+base] [?MM3*8+base] [?MM4*8+base] [?MM5*8+base] [?MM6*8+base] [?MM7*8+base] |
[?MM8*8+base] [?MM9*8+base] [?MM10*8+base] [?MM11*8+base] [?MM12*8+base] [?MM13*8+base] [?MM14*8+base] [?MM15*8+base] |
[?MM16*8+base] [?MM17*8+base] [?MM18*8+base] [?MM19*8+base] [?MM20*8+base] [?MM21*8+base] [?MM22*8+base] [?MM23*8+base] |
[?MM24*8+base] [?MM25*8+base] [?MM26*8+base] [?MM27*8+base] [?MM28*8+base] [?MM29*8+base] [?MM30*8+base] [?MM31*8+base] |
11 |
000 001 010 011 100 101 110 111 |
C0 C8 D0 D8 E0 E8 F0 F8 |
C1 C9 D1 D9 E1 E9 F1 F9 |
C2 CA D2 DA E2 EA F2 FA |
C3 CB D3 DB E3 EB F3 FB |
C4 CC D4 DC E4 EC F4 FC |
C5 CD D5 DD E5 ED F5 FD |
C6 CE D6 DE E6 EE F6 FE |
C7 CF D7 DF E7 EF F7 FF |
| notes | descriptions | ||||||||||||||||
| #1 |
if mod=00 then base=sdword if mod=01 then base=rBP+sbyte#5 (defaults to SS) if mod=10 then base=rBP+sdword (defaults to SS) |
||||||||||||||||
| #2 |
if mod=00 then base=sdword if mod=01 then base=r13+sbyte#5 if mod=10 then base=r13+sdword |
||||||||||||||||
| #3 |
if mod=00 then base=sdword if mod=01 then base=r21+sbyte#5 if mod=10 then base=r21+sdword |
||||||||||||||||
| #4 |
if mod=00 then base=sdword if mod=01 then base=r29+sbyte#5 if mod=10 then base=r29+sdword |
||||||||||||||||
| #5 | if MVEX/EVEX, then sbyte is interpreted as sbyte*N | ||||||||||||||||
© 1996-2024 by Christian Ludloff. All rights reserved. Use at your own risk.