[LLVMdev] Bug in x86 JIT fast emitter.

Nicolas Geoffray nicolas.geoffray at lip6.fr
Fri Jun 12 04:12:10 PDT 2009

Hi Mark,

Can't we run "lli -fast" on your .bc file instead of llc?


Mark Shannon wrote:
> Hi there,
> I think I've found a bug in the x86 JIT. I get an assertion failure when 
> using thread-local variables and the fast emitter.
> It only happens with the JIT, the fast emiiter and thread-locals.
> (The IR passes the verifier)
> Here's the failure:
> X86CodeEmitter.cpp:516: void<unnamed>::Emitter::emitInstruction(const 
> llvm::MachineInstr&, const llvm::TargetInstrDesc*): Assertion `0 && 
> "psuedo instructions should be removed before code emission"' failed.
> There is a problem with submitting a bug-report, however.
> Since llc has no trouble with thread-locals, I cannot actually generate 
> the assertion failure, without my compiler-generator.
> I can dump out the IR, but it is rather large.
> So,
> Is there a way to get llc to use the same emitter as the JIT, so that I
> can produce a reasonably sized test-case.
> I tried the -fast flag, but it compiles correctly.
> Cheers,
> Mark.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

More information about the llvm-dev mailing list