Difference between revisions of "Assembler:Commands:DEC"

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(Created page with ''''command''' dec ''operand'' Decreases the operand by one. Subtracts 1 from the operand, while preserving the state of the '''CF''' flag. The operand can be a register or a m…')
 
 
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[[Category:Assembler]]
 
'''command''' dec ''operand''
 
'''command''' dec ''operand''
  
 
Decreases the operand by one.
 
Decreases the operand by one.
  
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The '''CF''' flag is not affected. The '''OF''', '''SF''', '''ZF''', '''AF''',
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and '''PF''' flags are set according to the result.
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operand = operand - 1
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<div style="padding:2px;border:1px dashed #2f6fab;background-color:#f4f4f4;">
 
Subtracts 1 from the operand, while preserving the state of the '''CF''' flag.  
 
Subtracts 1 from the operand, while preserving the state of the '''CF''' flag.  
 
The operand can be a register or a memory location.  
 
The operand can be a register or a memory location.  
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use a [[Assembler:Commands:SUB|SUB]] instruction with an immediate operand of 1.)
 
use a [[Assembler:Commands:SUB|SUB]] instruction with an immediate operand of 1.)
  
 
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[http://c9x.me/x86/html/file_module_x86_id_71.html c9x.me/x86/html/file_module_x86_id_71.html]
The '''CF''' flag is not affected. The '''OF''', '''SF''', '''ZF''', '''AF''',
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</div>
and '''PF''' flags are set according to the result.
 
 
 
operand = operand - 1
 
  
  
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  dec [SomeSymbol]
 
  dec [SomeSymbol]
  
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{{AssemblerCommandSeeAlso}}
  
== See also ==
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{{Template:AssemblerCommandExternalLinks}}
* [[Assembler]]
 
* [[Cheat_Engine:Auto Assembler|Auto Assembler]]
 
* [[Assembler:Commands|Assembler Commands]]
 
 
 
== External links ==
 
* [https://wikipedia.org/wiki/X86_instruction_listings wikipedia.org/wiki/X86_instruction_listings]
 
* [https://wikibooks.org/wiki/X86_Assembly/Other_Instructions wikibooks.org/wiki/X86_Assembly/Other_Instructions]
 
* [http://www.asmpedia.org/index.php?title=Main_Page asmpedia.org]
 
* [http://x86.renejeschke.de/html/file_module_x86_id_71.html x86.renejeschke.de/html/file_module_x86_id_71.html]
 

Latest revision as of 15:42, 3 January 2018

command dec operand

Decreases the operand by one.


The CF flag is not affected. The OF, SF, ZF, AF, and PF flags are set according to the result.

operand = operand - 1


Subtracts 1 from the operand, while preserving the state of the CF flag. The operand can be a register or a memory location. This instruction allows a loop counter to be updated without disturbing the CF flag. (To perform a decrement operation that updates the CF flag, use a SUB instruction with an immediate operand of 1.)

c9x.me/x86/html/file_module_x86_id_71.html


Command Parameters[edit]

Parameter Description
operand The destination operand


Examples[edit]

dec al
dec ax
dec eax
dec rax
dec [00123ABC]
dec [rax]
dec [SomeSymbol]

See also[edit]

External links[edit]