One byte sign numbers add.

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Roman

Joined: 21 Apr 2012
Posts: 1794

Roman 16 Jun 2024, 06:07

X86
Very strange But I not find one asm command for this.
But exist imul asm command.
I want add - 1 and 1

1 = 1
-1 = 128

Simple add not good solution because wrong result.

And my two numbers changed sign.
I mean first or second or both could be negativ numbers.

16 Jun 2024, 06:07

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20342
Location: In your JS exploiting you and your system

revolution 16 Jun 2024, 08:32

Code:

mov al,1
add al,-1
 ; result is al = 0

-1 = 255

16 Jun 2024, 08:32

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