[llvm-commits] [llvm] r120841 - /llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp

[Evan Cheng]

When does this happen? Would this affect codegen in the presence of debug info? Or are these virtual registers only used to track debug info liveness?

Evan

On Dec 3, 2010, at 1:47 PM, Jakob Stoklund Olesen wrote:

> Author: stoklund
> Date: Fri Dec  3 15:47:08 2010
> New Revision: 120841
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=120841&view=rev
> Log:
> Also update virtRegMap when renaming virtual registers.
> 
> Modified:
>    llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp
> 
> Modified: llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp?rev=120841&r1=120840&r2=120841&view=diff
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp (original)
> +++ llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp Fri Dec  3 15:47:08 2010
> @@ -583,8 +583,18 @@
> 
> void LDVImpl::
> renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) {
> -  for (UserValue *UV = lookupVirtReg(OldReg); UV; UV = UV->getNext())
> +  UserValue *UV = lookupVirtReg(OldReg);
> +  if (!UV)
> +    return;
> +
> +  if (TargetRegisterInfo::isVirtualRegister(NewReg))
> +    mapVirtReg(NewReg, UV);
> +  virtRegMap.erase(OldReg);
> +
> +  do {
>     UV->renameRegister(OldReg, NewReg, SubIdx, TRI);
> +    UV = UV->getNext();
> +  } while (UV);
> }
> 
> void LiveDebugVariables::
> 
> 
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