[LLVMbugs] [Bug 3954] New: [ARM] An asm causes an assert.

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3954

           Summary: [ARM] An asm causes an assert.
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rich at pennware.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=2800)
 --> (http://llvm.org/bugs/attachment.cgi?id=2800)
The source .ll file.

Compiling the attached .ll file with the command lines:

[~/ellcc/ellcc] main% llvm-as -f t0064.ll
[~/ellcc/ellcc] main% llc -march arm t0064.bc

results in:

llc: /home/rich/llvm-trunk-new/lib/CodeGen/RegisterScavenging.cpp:273: void
llvm::RegScavenger::forward(): Assertion `(isReserved(Reg) || isUnused(Reg) ||
IsImpDef || isImplicitlyDefined(Reg) || isLiveInButUnusedBefore(Reg, MI, MBB,
TRI, MRI)) && "Re-defining a live register!"' failed.                           
0   llc       0x08d5616d                                                        
1   llc       0x08d5669f                                                        
2             0x0077e400 __kernel_sigreturn + 0                                 
3   libc.so.6 0x00bcce28 abort + 392                                            
4   libc.so.6 0x00bc440e __assert_fail + 238
5   llc       0x08b1a6d8 llvm::RegScavenger::forward() + 1778
6   llc       0x08645554
llvm::RegScavenger::forward(llvm::ilist_iterator<llvm::MachineInstr>) + 126
7   llc       0x08ae8f12
8   llc       0x08aed977
9   llc       0x0845fc26
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 52
10  llc       0x08cd6ae2 llvm::FPPassManager::runOnFunction(llvm::Function&) +
288
11  llc       0x08cd75d0 llvm::FunctionPassManagerImpl::run(llvm::Function&) +
124
12  llc       0x08cd77a1 llvm::FunctionPassManager::run(llvm::Function&) + 159
13  llc       0x083d1662 main + 2687
14  libc.so.6 0x00bb66e5 __libc_start_main + 229
15  llc       0x083cfb21
Stack dump:
0.      Program arguments: llc -march arm t0064.bc
1.      Running pass 'Prolog/Epilog Insertion & Frame Finalization' on function
'@foo'
Abort

[~/ellcc/ellcc] main%


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