llvm dev - Feb 2011 - [LLVMdev] How to create new local variable

Hi,
     I want to implement a simple common sub expression pass in
llvm2.8 which demands replacing the uses of the redundant expressions
with a temporary variable. So, to introduce new temporary variable I
have inserted an AllocaInst (...) providing the name of the temporary
and desired type. But whenever I am going to insert a LoadInst for
that variable I am getting segmentation fault. It is telling that
llvm::Value::setName(...) fails and that has something to do with
llvm::ValueSymbolTable::createValueName(...) method. What should I do
to insert the local variable?

Thanks and regards,

Abhirup Ghosh
M. Tech
Department of Computer Science & Engg.
IIT, Bombay
email - abhirupju at gmail.com , abhirup at cse.iitb.ac.in

Hi Abhirup,
>       I want to implement a simple common sub expression pass in
> llvm2.8
the development version of LLVM gained exactly such a CSE pass, called
EarlyCSE.

  which demands replacing the uses of the redundant
expressions
> with a temporary variable. So, to introduce new temporary variable I
> have inserted an AllocaInst (...) providing the name of the temporary
> and desired type. But whenever I am going to insert a LoadInst for
> that variable I am getting segmentation fault. It is telling that
> llvm::Value::setName(...) fails and that has something to do with
> llvm::ValueSymbolTable::createValueName(...) method. What should I do
> to insert the local variable?
I suggest you post the code you are using to do this.

Ciao, Duncan.