[LLVMdev] Register Allocation problem

[Chris Lattner]

On Mon, 16 May 2005, Misha Brukman wrote:
>> " llc: LiveVariables.cpp:86: void
>> llvm::LiveVariables::HandleVirtRegUse(llvm::LiveVariables::VarInfo&,
>> llvm::MachineBasicBlock*, llvm::MachineInstr*): Assertion
>> `VRInfo.DefInst && "Register use before def!"' failed.
>
> This is a bug in your instruction selector and the assertion is telling
> you exactly what's wrong.  Registers in MachineInstrs are also in SSA --
> there must be a single static def of any register before its use.

Another note: if you can't figure out what the problem is, please send the 
output of llc with the -print-machineinstrs flag to the list, and we'll 
try to help :)

-Chris

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