[LLVMdev] Error "Cannot emit physreg copy instruction"

[edA-qa mort-ora-y]

I've reduced the example down to a minimum. The error is quite
perplexing since the IR appears fine. It is a nonsensical infinite loop
now, but that shouldn't be a problem.

declare i64 @leaf_exception_personality(i64, i32, i64, i8*, i8*)

declare i8* @count_malloc(i64)

define internal i8 @junk___init_module_get_args_3() #0 {
entry:
  %_exception = alloca { i8*, i64 }
  %ignore0 = invoke i8* @count_malloc(i64 10)
          to label %loop_cond_7 unwind label %defer_error_land_4

defer_error_land_4:
  %lpres = landingpad { i8*, i64 } personality i64 (i64, i32, i64, i8*,
i8*)* @leaf_exception_personality
          cleanup
  store { i8*, i64 } %lpres, { i8*, i64 }* %_exception
  ret i8 0

loop_cond_7:
  %ignore1 = invoke i8* @count_malloc(i64 40)
          to label %loop_cond_7 unwind label %defer_error_land_4
}


On 09/11/13 12:47, edA-qa mort-ora-y wrote:
> I'm getting an error that I don't know how to fix. I've isolated the
> input as much as I easily can. I've attached the file that produces the
> problem. Just calling "llc err.ll -o err.s" generates the error.
> 
> I'm going to try and isolate even further, but as I'm not sure what I'm
> looking for I don't know if I'll be successful. Does anybody know what
> this error means?
> 
> Cannot emit physreg copy instruction
> UNREACHABLE executed at X86InstrInfo.cpp:2899!
> 0  libLLVM-3.3.so  0x00007f9f68ddf642
> llvm::sys::PrintStackTrace(_IO_FILE*) + 34
> 1  libLLVM-3.3.so  0x00007f9f68dde9a9
> 2  libpthread.so.0 0x00007f9f67a07cb0
> 3  libc.so.6       0x00007f9f67156425 gsignal + 53
> 4  libc.so.6       0x00007f9f67159b8b abort + 379
> 5  libLLVM-3.3.so  0x00007f9f68dc1e7c
> 6  libLLVM-3.3.so  0x00007f9f68fd1832
> llvm::X86InstrInfo::copyPhysReg(llvm::MachineBasicBlock&,
> llvm::MachineBasicBlock::bundle_iterator<llvm::MachineInstr,
> llvm::ilist_iterator<llvm::MachineInstr> >, llvm::DebugLoc, unsigned
> int, unsigned int, bool) const + 1762
> 7  libLLVM-3.3.so  0x00007f9f683afab1
> 8  libLLVM-3.3.so  0x00007f9f6864c417
> llvm::FPPassManager::runOnFunction(llvm::Function&) + 487
> 9  libLLVM-3.3.so  0x00007f9f6864c50b
> llvm::FPPassManager::runOnModule(llvm::Module&) + 43
> 10 libLLVM-3.3.so  0x00007f9f6864beff
> llvm::MPPassManager::runOnModule(llvm::Module&) + 559
> 11 libLLVM-3.3.so  0x00007f9f6864c165
> llvm::PassManagerImpl::run(llvm::Module&) + 245
> 12 llc             0x000000000040d217
> 13 llc             0x0000000000409a58 main + 360
> 14 libc.so.6       0x00007f9f6714176d __libc_start_main + 237
> 15 llc             0x0000000000409ae1
> Stack dump:
> 0.  Program arguments: /opt/llvm/install/bin/llc err.ll -o err.s
> 1.  Running pass 'Function Pass Manager' on module 'err.ll'.
> 2.  Running pass 'Post-RA pseudo instruction expansion pass' on function
> '@junk___init_module_get_args_3'
> 
> 
> 
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> 


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