Difference between revisions of "Assembler:Commands:NEG"

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(Created page with 'Category:Assembler '''command''' neg ''operand'' The neg instruction will subtract the operand from itself twice. Example: <pre>1 - 1 = 0 0 - 1 = -1</pre> This is what n…')
 
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'''command''' neg ''operand''
 
'''command''' neg ''operand''
  
The neg instruction will subtract the operand from itself twice.
+
The neg instruction performs a Two's Complement Negation.
  
 +
Other ways to understand:
 +
 +
- Operand subtracted from itself twice
 +
 +
- Operand subtracted from '0'
 +
 +
- The operand multiplied by '-1'
 +
 +
- Positive become negative
 +
 +
- Negative become Positive
  
Example:
 
 
<pre>1 - 1 = 0
 
<pre>1 - 1 = 0
 
 
0 - 1 = -1</pre>
 
0 - 1 = -1</pre>
 
This is what neg instruction perform.
 
  
  

Revision as of 02:26, 26 November 2017

command neg operand

The neg instruction performs a Two's Complement Negation.

Other ways to understand:

- Operand subtracted from itself twice

- Operand subtracted from '0'

- The operand multiplied by '-1'

- Positive become negative

- Negative become Positive

1 - 1 = 0
0 - 1 = -1


Operand = -Operand


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.

x86.renejeschke.de/html/file_module_x86_id_216.html


Command Parameters

Parameter Description
operand The operand to perform a Negate operation on


Examples

neg al
neg ah
neg ax
neg eax
neg rax
neg [edx+110]
neg [rdx+10]
neg [00123abc]
neg [UserDefinedSymbol]


See also


External links