XCHG - Exchange
Usage: XCHG dest,src
Modifies Flags: None
Exchanges contents of source and destination.
| Clocks | ||||
|---|---|---|---|---|
| operands | 286 | 386 | 486 | Size Bytes |
| reg,reg | 3 | 3 | 3 | 2 |
| mem,reg | 5 | 5 | 5 | 2-4 |
| reg,mem | 5 | 5 | 3 | 2-4 |
| accum,reg | 3 | 3 | 3 | 1 |
| reg,accum | 3 | 3 | 3 | 1 |
XLAT/XLATB - Translate
Usage: XLAT translation-table
XLATB (masm 5.x)
Modifies Flags: None
Replaces the byte in AL with byte from a user table addressed by BX. The original value of AL is the index into the translate table. The best way to discripe this is MOV AL,[BX+AL]
| Clocks | ||||
|---|---|---|---|---|
| operands | 286 | 386 | 486 | Size Bytes |
| table offset | 5 | 5 | 4 | 1 |
XOR - Exclusive OR
Usage: XOR dest,src
Modifies Flags: CF OF PF SF ZF (AF undefined)
Performs a bitwise exclusive OR of the operands and returns the result in the destination.
| Clocks | ||||
|---|---|---|---|---|
| operands | 286 | 386 | 486 | Size Bytes |
| reg,reg | 2 | 2 | 1 | 2 |
| mem,reg | 7 | 6 | 3 | 2-4 |
| reg,mem | 7 | 7 | 2 | 2-4 |
| reg,immed | 3 | 2 | 1 | 3-4 |
| mem,immed | 7 | 7 | 3 | 3-6 |
| accum,immed | 3 | 2 | 1 | 2-3 |
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