llvm dev - Oct 2014 - [LLVMdev] Need guidance regarding MachineFunctionPass

Hello,

I am writing a MachineFunctionPass that inspects the generated machine
code, and examines each opcode and its corresponding operands. If the
'instruction + operands' match a particular sequence, then the pass
should
replace them with a fixed instruction + operands sequence. I tried using
MachineInstr's getOpcode and getOperand functions but the pass didn't
work
as expected.

Kindly tell me how to proceed or point to appropriate references. Thank you
!

-- 
Regards,
Sachin
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Dear Sachin,

Your description of the problem contains too few details; no one will be 
able to diagnose the problem you're having.  You need to provide more 
information on what, exactly, is not working as you expected.

Regards,

John Criswell

On 10/2/14, 5:11 PM, sachin arora wrote:
> Hello,
>
> I am writing a MachineFunctionPass that inspects the generated machine 
> code, and examines each opcode and its corresponding operands. If the 
> 'instruction + operands' match a particular sequence, then the pass
> should replace them with a fixed instruction + operands sequence. I 
> tried using MachineInstr's getOpcode and getOperand functions but the 
> pass didn't work as expected.
>
> Kindly tell me how to proceed or point to appropriate references. 
> Thank you !
>
> -- 
> Regards,
> Sachin
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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Respected Dr. Criswell,

My problem is that the output of following code looks nothing like any
opcode:






*for(MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); )
{         MachineInstr *mi = I;         int op = mi->getOpcode();
std::cout << op << '\t';    }*

I need to identify specific instructions in my MachineFunctionPass and I
was hoping that I can do that by using *getOpcode(). *I am kinda stuck at
this point. Kindly guide me ! Thank you !

On Thu, Oct 2, 2014 at 4:37 PM, John Criswell <jtcriswel at gmail.com>
wrote:
>  Dear Sachin,
>
> Your description of the problem contains too few details; no one will be
> able to diagnose the problem you're having.  You need to provide more
> information on what, exactly, is not working as you expected.
>
> Regards,
>
> John Criswell
>
>
> On 10/2/14, 5:11 PM, sachin arora wrote:
>
>  Hello,
>
>  I am writing a MachineFunctionPass that inspects the generated machine
> code, and examines each opcode and its corresponding operands. If the
> 'instruction + operands' match a particular sequence, then the pass
should
> replace them with a fixed instruction + operands sequence. I tried using
> MachineInstr's getOpcode and getOperand functions but the pass
didn't work
> as expected.
>
>  Kindly tell me how to proceed or point to appropriate references. Thank
> you !
>
> --
> Regards,
> Sachin
>
>
> _______________________________________________
> LLVM Developers mailing listLLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
> --
> John Criswell
> Assistant Professor
> Department of Computer Science, University of
Rochesterhttp://www.cs.rochester.edu/u/criswell
>
>

-- 
Regards,
Sachin
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