super-space-optimized code

Posted by Will on Stack Overflow See other posts from Stack Overflow or by Will
Published on 2010-06-03T09:10:03Z Indexed on 2010/06/03 9:14 UTC
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Filed under:

optimization

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arm

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decryption

There are key self-contained algorithms - particularly cryptography-related such as AES, RSA, SHA1 etc - which you can find many implementations of for free on the internet.

Some are written to be nice and portable clean C.

Some are written to be fast - often with macros, and explicit unrolling.

As far as I can tell, none are trying to be especially super-small - so I'm resigned to writing my own - explicitly AES128 decryption and SHA1 for ARM THUMB2.

What patterns and tricks can I use to do so?

Are there compilers/tools that can roll-up code?

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