[LLVMdev] help using indvars pass

Kshitiz Garg ksh.cseiitk at gmail.com
Wed Apr 8 10:26:21 PDT 2009

I am trying to use the indvars pass on a simple loop but it does not seem to
have any effect
The sample code i am using is

#include <stdio.h>
int test (int p);
int main(){
        int a,b=3;
                if(b >3)

return 1;
int test(int p){
        return p;

According to documentation the loop should get converted to something like

for (a = 0; a != 25; ++a)
 but the generated IR does not reflect this.the loop still goes from 7
to 99. Neither is there a Phinode for a
I am using the following commands

llvm-gcc -emit-llvm -c hello.c

opt -indvars hello.o >hello.bc
llvm-dis hello.bc

Is there something  I am missing?


Kshitiz Garg
Graduate Student
Department of Computer Science & Engineering
IIT Kanpur
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