[LLVMdev] Question about SimplifyXorInst

[Xueying ZHANG]

Hi all,

I am master student in Edinburgh, UK. I am doing my MSc project with  
LLVM compiler and I have to modify LLVM to implement the StackGuard  
with a XOR random Canary. However, I am not familiar with LLVM.

My problem is that I want to XOR the random canary word with the  
return address which are both 32 bits. I found a method called  
SimplifyXorInst(Value *, Value *, const TargetData *,const  
DominatorTree *, unsigned) but I do not know whether it is right  
method and how to use it. Could you give me some advice or sample code  
about it?

Thank you
Best wishes,
Ying

-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.