2's Complement, is it implemented in Compiler or Hardware

[tia_design]

32's 2's complement is 00100000
25's 2's complement is 00011001
-25's 2's complement is 11100111

2's complement subtraction, like 32 - (-25), it will be finally converted into addition in computer as 2's complement like 00100000 + 00011001. Is this converstion made by compiler or in hardware?
I'm going to design a microcontroller, in my assembly language, for 32 - (-25), should I directly write 00100000 + 00011001? or should I write 00100000 - 11100111, and design some hardware in microcontroller to convert it into addtion? Thanks!

 

[santoshl]

hi,
As per my knowledge subtration and additon are both done in hardware itslef.Hence, 2's compilment should also be done in hardware.
Its quite easy to impelent tht. If u find it difficult to do tht plz let me know, i will help u out.

SantoshL

 

[onlymusic16]

Re: 2's Complement, is it implemented in Compiler or Hardwar

Hi,

2's complement will be implemented in hardware, hence write your assembly code accordingly.

 

[A.Anand Srinivasan]

Re: 2's Complement, is it implemented in Compiler or Hardwar

2's complement would be implemented in hardware itself because it is needed for subtraction....

 

[vlsi_freak]

Re: 2's Complement, is it implemented in Compiler or Hardwar

Hi.

When designing controllers we will be having Arithmetic and Logic circts. We will be implementing ADDER. Now ahardware designer will always try to reduce hardware. He will not go for seperate hw's for adders, subractors. He will try to do add/sub using the same logic, and sub using 2's compl method is simply doing that.

Hope it helps.

Thanks