[LLVMdev] [PATCH] Emit rbit, clz on ARM for __builtin_ctz

[Eli Friedman]

On Mon, Jan 18, 2010 at 5:10 PM, Jakob Stoklund Olesen <stoklund at 2pi.dk> wrote:
>
> On Jan 15, 2010, at 10:03 AM, Chris Lattner wrote:
>>
>> When/if another target wants this, we could add a ISD::RBIT operation,
>> it doesn't need to be added at the llvm ir level,
>
> Blackfin can add with backwards carry, essentially doing
>
> (rbit (add (rbit a), (rbit b)))
>
> This is used for FFTs.
>
> I wasn't hoping to be able to pattern-match something so complicated.

Feel free to add target intrinsics where appropriate...

-Eli