Intel Pentium CPU Instruction Set Reference
XOR instruction - Logical Exclusive OR
| Code |
Mnemonic |
Description |
| 34 ib |
XOR AL, imm8 |
AL XOR imm8 |
| 35 iw |
XOR AX, imm16 |
AX XOR imm16 |
| 35 id |
XOR EAX, imm32 |
EAX XOR imm32 |
| 80 /6 ib |
XOR r/m8, imm8 |
r/m8 XOR imm8 |
| 81 /6 iw |
XOR r/m16, imm16 |
r/m16 XOR imm16 |
| 81 /6 id |
XOR r/m32, imm32 |
r/m32 XOR imm32 |
| 83 /6 ib |
XOR r/m16, imm8 |
r/m16 XOR imm8 (sign-extended) |
| 83 /6 ib |
XOR r/m32, imm8 |
r/m32 XOR imm8 (sign-extended) |
| 30 / r |
XOR r/m8, r8 |
r/m8 XOR r8 |
| 31 / r |
XOR r/m16, r16 |
r/m16 XOR r16 |
| 31 / r |
XOR r/m32, r32 |
r/m32 XOR r32 |
| 32 / r |
XOR r8, r/m8 |
r8 XOR r/m8 |
| 33 / r |
XOR r16, r/m16 |
r8 XOR r/m8 |
| 33 / r |
XOR r32, r/m32 |
r8 XOR r/m8 |
Description
Performs a bitwise exclusive OR (XOR) operation on the destination (first) and source (second) operands and stores the result in the destination operand location. The source operand can be an immediate, a register, or a memory location; the destination operand can be a register or a memory location. (However, two memory operands cannot be used in one instruction.) Each bit of the result is 1 if the corresponding bits of the operands are different; each bit is 0 if the corresponding bits are the same.
| Operands |
Bytes |
Clocks |
| reg, reg |
2 |
1 |
UV |
| mem, reg |
2 + d(0, 2) |
3 |
UV |
| reg, mem |
2 + d(0, 2) |
2 |
UV |
| reg, imm |
2 + i(1, 2) |
1 |
UV |
| mem, imm |
2 + d(0, 2) + i(1, 2) |
3 |
UV (not pairable if there is a displacement and immediate) |
| acc, imm |
1 + i(1, 2) |
1 |
UV |
Flags
| ID |
unaffected |
DF |
unaffected |
| VIP |
unaffected |
IF |
unaffected |
| VIF |
unaffected |
TF |
unaffected |
| AC |
unaffected |
SF |
sets according to the result |
| VM |
unaffected |
ZF |
sets according to the result |
| RF |
unaffected |
AF |
undefined |
| NT |
unaffected |
PF |
sets according to the result |
| IOPL |
unaffected |
CF |
cleared |
| OF |
cleared |
