[LLVMdev] LLVM Instruction*->getOperand() not working properly for ICMP

[Alexandru Ionut Diaconescu]

Hello everyone !

In my pass I inspect the penultimate instruction from every basic block in
runOnFunction(). I am interested in ICMP instructions only.

if(BB->size()>1)
    if(last->getPrevNode())
    {
        previous = last->getPrevNode();
        ok=1;
    }

I want to get the operands of previous, which is of type Instruction*. Due
tests based on getNumOperands, ICMP has 2 (as normal).

if ( ok && ((previous->getNumOperands())>=2) )

    errs()<<"\nTTTTT "<<previous->getOperand(0)->getName()<<" | "
          <<previous->getOperand(0)->getValueName()<<" | "
          <<previous->getOperand(0)->getValueID()<<" | "
          <<previous->getOperand(0)->getNumUses()<<" TTTTT\n";

The results with getOperand(1) are similar. The output is:

*PREVIOUS:   store i32 %conv15, i32* %i, align 4
TTTTT conv15 | 0x9b69090 | 59 | 1 TTTTT
...
*PREVIOUS:   store i32 %inc13, i32* %i, align 4
TTTTT inc13 | 0x9b76478 | 30 | 1 TTTTT
...
*PREVIOUS:   %cmp11 = icmp sgt i32 %8, 3
TTTTT  | 0x0 | 49 | 1 TTTTT
...
*PREVIOUS:   store i32 %dec, i32* %i, align 4
TTTTT dec | 0x9b69130 | 30 | 1 TTTTT
...
*PREVIOUS:   %cmp8 = icmp sle i32 %6, 2
TTTTT  | 0x0 | 49 | 1 TTTTT
...
*PREVIOUS:   store i32 %inc, i32* %i, align 4
TTTTT inc | 0x9b761c8 | 30 | 1 TTTTT

Do you know how I can get the operands from ICMP instructions? I need to
use them in some conditions? (also their attributes). Thank you a lot !


-- 
Best regards,
Alexandru Ionut Diaconescu
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130110/79ebbe2f/attachment.html>