[LLVMbugs] [Bug 11476] New: InlineSpiller generates invalid register values
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sun Dec 4 07:33:14 PST 2011
http://llvm.org/bugs/show_bug.cgi?id=11476
Bug #: 11476
Summary: InlineSpiller generates invalid register values
Product: libraries
Version: trunk
Platform: All
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Register Allocator
AssignedTo: unassignedbugs at nondot.org
ReportedBy: hfinkel at anl.gov
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
Running llc (trunk 145766) on the attached input generates a crash because
foldMemoryOperand is calling TargetInstrInfo::foldMemoryOperand which is
calling PPCInstrInfo::storeRegToStackSlot with an invalid register number.
The actual backtrace is (abbreviated):
Unhandled reg in PPCRegisterInfo::getRegisterNumbering!
UNREACHABLE executed at
/src/llvm-trunk-writable/lib/Target/PowerPC/MCTargetDesc/PPCBaseInfo.h:64!
...
#2 0x0000000001533aa1 in llvm::llvm_unreachable_internal (msg=0x16cd920
"Unhandled reg in PPCRegisterInfo::getRegisterNumbering!",
file=0x16cd8c0
"/src/llvm-trunk-writable/lib/Target/PowerPC/MCTargetDesc/PPCBaseInfo.h",
line=64)
at /src/llvm-trunk-writable/lib/Support/ErrorHandling.cpp:98
#3 0x0000000000d38dda in getPPCRegisterNumbering (RegEnum=2147483882)
at
/src/llvm-trunk-writable/lib/Target/PowerPC/MCTargetDesc/PPCBaseInfo.h:64
#4 0x0000000000d3aad3 in llvm::PPCInstrInfo::StoreRegToStackSlot
(this=0x2438730, MF=..., SrcReg=2147483882, isKill=false, FrameIdx=3,
RC=0x1ef3e00, NewMIs=...)
at /src/llvm-trunk-writable/lib/Target/PowerPC/PPCInstrInfo.cpp:423
#5 0x0000000000d3b01a in llvm::PPCInstrInfo::storeRegToStackSlot
(this=0x2438730, MBB=..., MI=..., SrcReg=2147483882, isKill=false, FrameIdx=3,
RC=0x1ef3e00,
TRI=0x2438758) at
/src/llvm-trunk-writable/lib/Target/PowerPC/PPCInstrInfo.cpp:497
#6 0x00000000011fb0dc in llvm::TargetInstrInfo::foldMemoryOperand
(this=0x2438730, MI=..., Ops=..., FI=3)
at /src/llvm-trunk-writable/lib/CodeGen/TargetInstrInfoImpl.cpp:321
#7 0x00000000012224aa in foldMemoryOperand (this=0x223c300, MI=..., Ops=...,
LoadMI=0x0)
at /src/llvm-trunk-writable/lib/CodeGen/InlineSpiller.cpp:1044
#8 0x00000000012230f1 in spillAroundUses (this=0x223c300, Reg=2147483881) at
/src/llvm-trunk-writable/lib/CodeGen/InlineSpiller.cpp:1175
#9 0x000000000122370b in spillAll (this=0x223c300) at
/src/llvm-trunk-writable/lib/CodeGen/InlineSpiller.cpp:1238
#10 0x0000000001223b8f in spill (this=0x223c300, edit=...) at
/src/llvm-trunk-writable/lib/CodeGen/InlineSpiller.cpp:1286
#11 0x00000000011625f5 in selectOrSplit (this=0x2450ad0, VirtReg=...,
NewVRegs=...)
at /src/llvm-trunk-writable/lib/CodeGen/RegAllocGreedy.cpp:1593
#12 0x000000000114e020 in llvm::RegAllocBase::allocatePhysRegs (this=0x2450af0)
at /src/llvm-trunk-writable/lib/CodeGen/RegAllocBasic.cpp:322
#13 0x0000000001162a21 in runOnMachineFunction (this=0x2450ad0, mf=...) at
/src/llvm-trunk-writable/lib/CodeGen/RegAllocGreedy.cpp:1630
...
(gdb) up
#3 0x0000000000d38dda in getPPCRegisterNumbering (RegEnum=2147483882)
at
/src/llvm-trunk-writable/lib/Target/PowerPC/MCTargetDesc/PPCBaseInfo.h:64
64 llvm_unreachable("Unhandled reg in
PPCRegisterInfo::getRegisterNumbering!");
(gdb) up
#4 0x0000000000d3aad3 in llvm::PPCInstrInfo::StoreRegToStackSlot
(this=0x2438730, MF=..., SrcReg=2147483882, isKill=false, FrameIdx=3,
RC=0x1ef3e00, NewMIs=...)
at /src/llvm-trunk-writable/lib/Target/PowerPC/PPCInstrInfo.cpp:423
423 unsigned ShiftBits = getPPCRegisterNumbering(SrcReg)*4;
(gdb) up
#5 0x0000000000d3b01a in llvm::PPCInstrInfo::storeRegToStackSlot
(this=0x2438730, MBB=..., MI=..., SrcReg=2147483882, isKill=false, FrameIdx=3,
RC=0x1ef3e00,
TRI=0x2438758) at
/src/llvm-trunk-writable/lib/Target/PowerPC/PPCInstrInfo.cpp:497
497 if (StoreRegToStackSlot(MF, SrcReg, isKill, FrameIdx, RC, NewMIs)) {
(gdb) up
#6 0x00000000011fb0dc in llvm::TargetInstrInfo::foldMemoryOperand
(this=0x2438730, MI=..., Ops=..., FI=3)
at /src/llvm-trunk-writable/lib/CodeGen/TargetInstrInfoImpl.cpp:321
321 storeRegToStackSlot(*MBB, Pos, MO.getReg(), MO.isKill(), FI, RC,
TRI);
...
(gdb) p *MI
$3 = (llvm::MachineInstr &) @0x2695a68: {<llvm::ilist_node<llvm::MachineInstr>>
= {<llvm::ilist_half_node<llvm::MachineInstr>> = {Prev = 0x284e660},
Next = 0x284e5b0}, MCID = 0x1e5c3a0, Flags = 0 '\000', AsmPrinterFlags = 0
'\000', Operands = std::vector of length 2, capacity 2 = {{OpKind = 0 '\000',
SubReg = 0 '\000', TargetFlags = 0 '\000', IsDef = true, IsImp = false,
IsKill = false, IsDead = false, IsUndef = false, IsEarlyClobber = false,
IsDebug = false, SmallContents = {RegNo = 2147483881, OffsetLo =
2147483881}, ParentMI = 0x2695a68, Contents = {MBB = 0x2282008, CFP =
0x2282008,
CI = 0x2282008, ImmVal = 36184072, MD = 0x2282008, Sym = 0x2282008, Reg
= {Prev = 0x2282008, Next = 0x24fe240}, OffsetedInfo = {Val = {Index =
36184072,
SymbolName = 0x2282008 "Б&\002", GV = 0x2282008, BA = 0x2282008},
OffsetHi = 38789696}}}, {OpKind = 0 '\000', SubReg = 0 '\000', TargetFlags = 0
'\000',
IsDef = false, IsImp = false, IsKill = false, IsDead = false, IsUndef =
false, IsEarlyClobber = false, IsDebug = false, SmallContents = {RegNo =
2147483882,
OffsetLo = 2147483882}, ParentMI = 0x2695a68, Contents = {MBB =
0x249a308, CFP = 0x249a308, CI = 0x249a308, ImmVal = 38380296, MD = 0x249a308,
Sym = 0x249a308, Reg = {Prev = 0x249a308, Next = 0x0}, OffsetedInfo =
{Val = {Index = 38380296, SymbolName = 0x249a308 "\360\221&\002", GV =
0x249a308,
BA = 0x249a308}, OffsetHi = 0}}}}, MemRefs = 0x0, MemRefsEnd = 0x0,
Parent = 0x2618cb8, debugLoc = {LineCol = 0, ScopeIdx = 0}}
(so the MI being provided to TargetInstrInfo::foldMemoryOperand by
foldMemoryOperand in InlineSpiller has a register with an invalid number (does
that large number indicate a virtual register?))
0. Program arguments: llc -o /tmp/tscvec.s /tmp/tscvec.ll
1. Running pass 'Function Pass Manager' on module '/tmp/tscvec.ll'.
2. Running pass 'Greedy Register Allocator' on function '@s3110'
I've tried running this under valgrind on both linux/ppc64 and linux/x86_64,
and the crash is the same on both systems, and on both systems, valgrind gives
the process of clean bill of health.
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