On Sun, Jul 13, 2008 at 6:29 AM, Andi Kleen <[EMAIL PROTECTED]> wrote:
> Nils Pipenbrinck <[EMAIL PROTECTED]> writes:
>
>> Since the codebase is huge I have the feeling that I have overlooked
>> something. Does some kind of infrastructure to detect patterns within
>> a SSA tree already exists somew
Nils Pipenbrinck <[EMAIL PROTECTED]> writes:
> Since the codebase is huge I have the feeling that I have overlooked
> something. Does some kind of infrastructure to detect patterns within
> a SSA tree already exists somewhere else?
FWIW some time ago I wanted to do some other arithmetic optimizat
Hi there.
I recently came across a nice micro-optimization to permutate bytes
within a dword. On x86 all 24 combinations can be done using a maximum
of 3 instructions (bswap, rotate32 and rotate16).
I'd like to give it a try and write an optimization pass that detects
such dword permutations
