Intel Pentium CPU Instruction Set Reference
NEG instruction - Two's Complement Negation
| Code |
Mnemonic |
Description |
| F6 /3 |
NEG r/m8 |
Two's complement negate r/m8 |
| F7 /3 |
NEG r/m16 |
Two's complement negate r/m16 |
| F7 /3 |
NEG r/m32 |
Two's complement negate r/m32 |
Description
Replaces the value of operand (the destination operand) with its two's complement. (This operation is equivalent to subtracting the operand from 0.) The destination operand is located in a general-purpose register or a memory location.
| Operands |
Bytes |
Clocks |
| reg |
2 |
1 |
NP |
| mem |
2 + d(0 - 2) |
3 |
NP |
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 |
sets according to the result |
| NT |
unaffected |
PF |
sets according to the result |
| IOPL |
unaffected |
CF |
cleared to 0 if the source operand is 0; otherwise it is set to 1 |
| OF |
sets according to the result |
