[LLVMdev] Need guidance regarding MachineFunctionPass (original) (raw)

sachin arora sachin345678 at gmail.com
Thu Oct 2 17:57:09 PDT 2014

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

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

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