[LLVMdev] Initial cut at a instruction raising patch

[Chris Lattner]

On Aug 8, 2009, at 1:37 PM, Richard Pennington wrote:

> Chris Lattner wrote:
>> How do you plan to handle things like arbitrary precision integers,
>> etc?  It seems like you'll end up duplicating a ton of codegen logic
>> to handle this.
>
> Maybe I'm not being very clear. I want this replacement to be done at
> the very last minute (before unreferenced functions are removed, of
> course).

The last possible minute, right before isel, still has arbitrary  
precision integers.  The right place to do something like this is in  
the code generator, which is where it happens.

-Chris

>
> I only want to catch libgcc-ish functions.
>
> For example on the x86 (32) a function containing prinf() only needs
> __divdi3 and __moddi3.
>
> I'd like the code generator to do its magic until there is no more  
> magic
> to do, and then replace any 64 bit divides with the function call, for
> example.
>
> Make sense?
>
> -Rich
>
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