[LLVMbugs] [Bug 11314] New: Assertion `BestRC && "Couldn't find the register class"

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11314

             Bug #: 11314
           Summary: Assertion `BestRC && "Couldn't find the register
                    class"
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: pdox at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 7577
  --> http://llvm.org/bugs/attachment.cgi?id=7577
reproducer

After r143660, the attached bitcode triggers an assertion when compiled with:

$ llc -march=x86 -mcpu=pentium4 -mtriple=i686-none-linux bug.ll

llvm/lib/Target/TargetRegisterInfo.cpp:68: const llvm::TargetRegisterClass*
llvm::TargetRegisterInfo::getMinimalPhysRegClass(unsigned int, llvm::EVT)
const: Assertion `BestRC && "Couldn't find the register class"' failed.
0  llc             0x0000000000d9a01f
1  llc             0x0000000000d9c292
2  libpthread.so.0 0x00007fdd4a1118f0
3  libc.so.6       0x00007fdd49400a75 gsignal + 53
4  libc.so.6       0x00007fdd494045c0 abort + 384
5  libc.so.6       0x00007fdd493f9941 __assert_fail + 241
6  llc             0x0000000000c3d034
llvm::TargetRegisterInfo::getMinimalPhysRegClass(unsigned int, llvm::EVT) const
+ 324
7  llc             0x00000000007d67b4
8  llc             0x00000000007d714f
9  llc             0x0000000000a5ad71
llvm::ScheduleDAG::Run(llvm::MachineBasicBlock*,
llvm::ilist_iterator<llvm::MachineInstr>) + 1617
10 llc             0x0000000000855ebb
llvm::SelectionDAGISel::CodeGenAndEmitDAG() + 1403
11 llc             0x0000000000856c9e
llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::Instruction
const>, llvm::ilist_iterator<llvm::Instruction const>, bool&) + 270
12 llc             0x0000000000859b19
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 2265
13 llc             0x000000000085f430
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 1024
14 llc             0x0000000000cf00bb
llvm::FPPassManager::runOnFunction(llvm::Function&) + 587
15 llc             0x0000000000cf01a3
llvm::FPPassManager::runOnModule(llvm::Module&) + 51
16 llc             0x0000000000cefbb7
llvm::MPPassManager::runOnModule(llvm::Module&) + 503
17 llc             0x0000000000cefd4b llvm::PassManagerImpl::run(llvm::Module&)
+ 187
18 llc             0x000000000052f5da main + 4234
19 libc.so.6       0x00007fdd493ebc4d __libc_start_main + 253
20 llc             0x000000000052cb99
Stack dump:
0.    Program arguments: llvm-install/bin/llc -march=x86 -mcpu=pentium4
-mtriple=i686-none-linux bug.ll -o bug.s 
1.    Running pass 'Function Pass Manager' on module 'bug.ll'.
2.    Running pass 'X86 DAG->DAG Instruction Selection' on function '@sscanf'

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