[LLVMbugs] [Bug 6612] New: UNREACHABLE executed! in X86 DAG->DAG isel

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6612

           Summary: UNREACHABLE executed! in X86 DAG->DAG isel
           Product: new-bugs
           Version: 2.6
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: eschew at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=4513)
 --> (http://llvm.org/bugs/attachment.cgi?id=4513)
Minimal testcase for X86 DAG->DAG isel crash

This crashes llc:

%Counter = type { %tuple1 (i8*)*, i8* }
%tuple1 = type { i32, %Counter }

define %tuple1 @foo() nounwind readonly {
entry:
  ret %tuple1 undef
}


I tested with version 2.6 installed via macports, and I also confirmed that the
same behavior happens on Ubuntu with the 2.6 Linux x86 binaries from the
Releases page.

Attached is the full minimal testcase.

Here's the full backtrace:

2010-03-14 04:22:08 ~/Code/fxc/ $ llc bad2.bc
UNREACHABLE executed!
0   llc               0x00a2ba78 std::_Rb_tree<llvm::sys::Path,
llvm::sys::Path, std::_Identity<llvm::sys::Path>, std::less<llvm::sys::Path>,
std::allocator<llvm::sys::Path> >::insert_unique(llvm::sys::Path const&) + 8696
1   llc               0x00a2c2b8 std::_Rb_tree<llvm::sys::Path,
llvm::sys::Path, std::_Identity<llvm::sys::Path>, std::less<llvm::sys::Path>,
std::allocator<llvm::sys::Path> >::insert_unique(llvm::sys::Path const&) +
10808
2   libSystem.B.dylib 0x9736f2bb _sigtramp + 43
3   libSystem.B.dylib 0xffffffff _sigtramp + 1758006639
4   libSystem.B.dylib 0x973e323a raise + 26
5   libSystem.B.dylib 0x973ef679 abort + 73
6   llc               0x00a08a13
llvm::ConstantRange::ConstantRange(llvm::ConstantRange const&) + 10931
7   llc               0x00530463
llvm::RegisterTargetMachine<llvm::X86_64TargetMachine>::Allocator(llvm::Target
const&, std::string const&, std::string const&) + 1619
8   llc               0x004fa086 (anonymous
namespace)::X86FastISel::FastEmit_rr(llvm::MVT, llvm::MVT, llvm::ISD::NodeType,
unsigned int, unsigned int) + 1305974
9   llc               0x00685a8e llvm::APInt::getHighBitsSet(unsigned int,
unsigned int) + 273438
10  llc               0x00685ec3 llvm::APInt::getHighBitsSet(unsigned int,
unsigned int) + 274515
11  llc               0x00692b11
llvm::TargetLowering::getNumRegisters(llvm::LLVMContext&, llvm::EVT) const +
17345
12  llc               0x00693e91
llvm::TargetLowering::getNumRegisters(llvm::LLVMContext&, llvm::EVT) const +
22337
13  llc               0x006954b6
llvm::TargetLowering::getNumRegisters(llvm::LLVMContext&, llvm::EVT) const +
28006
14  llc               0x007580df std::vector<llvm::MachineJumpTableEntry,
std::allocator<llvm::MachineJumpTableEntry>
>::_M_insert_aux(__gnu_cxx::__normal_iterator<llvm::MachineJumpTableEntry*,
std::vector<llvm::MachineJumpTableEntry,
std::allocator<llvm::MachineJumpTableEntry> > >, llvm::MachineJumpTableEntry
const&) + 1631
15  llc               0x0099cda5 llvm::FunctionPass::~FunctionPass() + 34821
16  llc               0x0099d080 llvm::FunctionPass::~FunctionPass() + 35552
17  llc               0x0099d298 llvm::FunctionPass::~FunctionPass() + 36088
18  llc               0x00003ef9 _mh_execute_header + 12025
19  llc               0x00001c36 _mh_execute_header + 3126
20  llc               0x00000002 _mh_execute_header + 18446744073709547522
Stack dump:
0.    Program arguments: llc bad2.bc 
1.    Running pass 'X86 DAG->DAG Instruction Selection' on function '@foo'
Abort trap

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