[LLVMdev] Move instruction

[Karhu, Abhinav R]

oh thanks oven,
that is ultimately cool :)
----- Original Message -----
From: "Owen Anderson" <resistor at mac.com>
To: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
Sent: Sunday, November 16, 2008 3:44:09 AM GMT -05:00 US/Canada Eastern
Subject: Re: [LLVMdev] Move instruction

r2->replaceAllUsesWith(r1);
r2->eraseFromParent();

LLVM makes it easy! ;-)

--Owen

On Nov 15, 2008, at 11:02 PM, Karhu, Abhinav R wrote:

> Hi owen,
> Can you please elaborate as to what should I do? Find all the  
> instruction which have r2 in it and replace all of them with r1 and  
> then remove the load instruction?
> Thanks
> Abhinav
> ----- Original Message -----
> From: "Owen Anderson" <resistor at mac.com>
> To: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Sent: Friday, November 14, 2008 11:22:32 PM GMT -06:00 US/Canada  
> Central
> Subject: Re: [LLVMdev] Move instruction
>
>
> On Nov 14, 2008, at 9:13 PM, Karhu, Abhinav R wrote:
>
>> Hi Eli,
>> I want to do redundant load elimination. A simple example for that
>> would be
>>
>> load (a1) , r1;
>> ---
>> ---
>> ---
>> load (a2) , r2;
>>
>> Now if a1 and a2 are alias of each other and the value stored in a1
>> and a2 remains the same then I can say that the second load is
>> redundant.
>> I can replace the second load with these instructions
>>
>> mov r0 r1;
>> mov r0 r2; and remove the load instruction.
>>
>
> You don't need to copy r1.  Just replace all uses of r2 with r1, and
> get rid of the definition of r2.
>
> --Owen
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> -- 
> Abhinav Karhu
> MS Computer Science
> Georgia Institute of Technology
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-- 
Abhinav Karhu
MS Computer Science
Georgia Institute of Technology