[llvm-bugs] [Bug 26617] New: PowerPC: SEGV in llvm::PPCGenRegisterInfo::getSubClassWithSubReg

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26617

            Bug ID: 26617
           Summary: PowerPC: SEGV in
                    llvm::PPCGenRegisterInfo::getSubClassWithSubReg
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: anton at samba.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15907
  --> https://llvm.org/bugs/attachment.cgi?id=15907&action=edit
Test case

The attached 32bit test case hits a SEGV:

llc -O2 bugpoint-reduced-simplified.ll

Program received signal SIGSEGV, Segmentation fault.
0x00000000101fe330 in llvm::PPCGenRegisterInfo::getSubClassWithSubReg
(this=0x10d6b1f8, RC=0x0, Idx=<optimised out>) at
lib/Target/PowerPC/PPCGenRegisterInfo.inc:4574
4574      if (!Idx) return RC;
(gdb) backtrace 
#0  0x00000000101fe330 in llvm::PPCGenRegisterInfo::getSubClassWithSubReg
(this=0x10d6b1f8, RC=0x0, Idx=<optimised out>) at
lib/Target/PowerPC/PPCGenRegisterInfo.inc:4574
#1  0x000000001094bdd4 in llvm::InstrEmitter::EmitSubregNode
(this=0x3fffffffdab0, Node=0x10d9f4f0, VRBaseMap=..., IsClone=false,
IsCloned=false) at
/home/anton/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp:549
#2  0x0000000010951248 in llvm::InstrEmitter::EmitMachineNode
(this=0x3fffffffdab0, Node=0x10d9f4f0, IsClone=<optimised out>,
IsCloned=<optimised out>, VRBaseMap=...)
    at /home/anton/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp:729
#3  0x00000000108a0840 in llvm::InstrEmitter::EmitNode (VRBaseMap=...,
IsCloned=<optimised out>, IsClone=<optimised out>, Node=<optimised out>,
this=<optimised out>)
    at /home/anton/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.h:121
#4  llvm::ScheduleDAGSDNodes::EmitSchedule (this=0x10d981f0, InsertPos=...) at
/home/anton/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp:846
#5  0x000000001091bb64 in llvm::SelectionDAGISel::CodeGenAndEmitDAG
(this=0x10d470d0) at
/home/anton/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:869
#6  0x000000001091bea4 in llvm::SelectionDAGISel::SelectBasicBlock
(this=0x10d470d0, Begin=..., End=..., HadTailCall=@0x3fffffffdfcf: false) at
/home/anton/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:669
#7  0x00000000109234f8 in llvm::SelectionDAGISel::SelectAllBasicBlocks
(this=0x10d470d0, Fn=...) at
/home/anton/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1361
#8  0x0000000010925188 in llvm::SelectionDAGISel::runOnMachineFunction
(this=0x10d470d0, mf=...) at
/home/anton/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:503
#9  0x0000000010196dd0 in (anonymous
namespace)::PPCDAGToDAGISel::runOnMachineFunction (this=0x10d470d0, MF=...) at
/home/anton/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:87
#10 0x0000000010480078 in llvm::MachineFunctionPass::runOnFunction
(this=0x10d470d0, F=...) at
/home/anton/llvm/lib/CodeGen/MachineFunctionPass.cpp:43
#11 0x00000000106fe9ec in llvm::FPPassManager::runOnFunction (this=0x10d437a0,
F=...) at /home/anton/llvm/lib/IR/LegacyPassManager.cpp:1550
#12 0x00000000106fef2c in llvm::FPPassManager::runOnModule (this=0x10d437a0,
M=...) at /home/anton/llvm/lib/IR/LegacyPassManager.cpp:1571
#13 0x00000000106fe4d4 in (anonymous namespace)::MPPassManager::runOnModule
(M=..., this=0x10d31500) at /home/anton/llvm/lib/IR/LegacyPassManager.cpp:1627
#14 llvm::legacy::PassManagerImpl::run (this=0x10d32210, M=...) at
/home/anton/llvm/lib/IR/LegacyPassManager.cpp:1730
#15 0x00000000106fe75c in llvm::legacy::PassManager::run (this=<optimised out>,
M=...) at /home/anton/llvm/lib/IR/LegacyPassManager.cpp:1761
#16 0x000000001014b798 in compileModule (argv=0x3fffffffeff8, Context=...) at
/home/anton/llvm/tools/llc/llc.cpp:405
#17 0x0000000010129c38 in main (argc=<optimised out>, argv=0x3fffffffeff8) at
/home/anton/llvm/tools/llc/llc.cpp:211

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