[LLVMdev] Help required in instruction selection.

[pratik dand]

Dear Tim,

I am working on a cryptography project. So I need the operand to have a
boolean attribute say Encrypted. If the operands are encrypted I want to
use say ADD* instruction else the the ADD instruction.

I was hoping to find answers for How to add a new instruction to the
backend and how to modify the ISel mechanism such that the above
requirement is fulfilled.

Regards,
Pratik


On Tue, Jun 10, 2014 at 8:21 PM, Tim Northover <t.p.northover at gmail.com>
wrote:

> Hi Pratik,
>
> On 10 June 2014 06:38, pratik dand <pratikdand143 at gmail.com> wrote:
> > Say the operands have a boolean attribute 'attr'. I would like to select
> I1
> > and I2 by some logic that involves the 'attr' attribute of all the
> operands
> > involved.
>
> What does this attribute represent? It's possible LLVM already has an
> analogue and uses a different way to get the right code out.
>
> In general operands don't have many intrinsic attributes: type is the
> main one. Though different kinds of operands have more information
> attached.
>
> Cheers.
>
> Tim.
>



-- 
Pratik
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