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[ASM] Adding SIGNED numbers?


 
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# 1  
Old 10-30-2011
[ASM] Adding SIGNED numbers?

Hi guys, I want to add a list of SIGNED numbers... but I don't know how to tell the computer to ADD THEM as signed, let me explain further:

when adding 200 + (-100) , it becomes 100, but in asm the computer always add them as unsigned, so I always get the 300. Do I have to add them in a register, and do the two's complement ?
# 2  
Old 10-30-2011
Code:
# how about using abs 
abs(number) + abs(number)

# 3  
Old 10-31-2011
Quote:
Originally Posted by lamachejo
Hi guys, I want to add a list of SIGNED numbers... but I don't know how to tell the computer to ADD THEM as signed, let me explain further:

when adding 200 + (-100) , it becomes 100, but in asm the computer always add them as unsigned, so I always get the 300. Do I have to add them in a register, and do the two's complement ?
That doesn't sound like expected behavior at all...

How many bits are these numbers? Could they be wrapping?
# 4  
Old 10-31-2011
They are 32 bits but adding them in 2 registers so I can have a 64 bits number (with adc, in eax:edx).
# 5  
Old 10-31-2011
I'm not sure that really works as intended. You might try adding in MMX registers to get 64-bit data.

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