[LLVMbugs] [Bug 16083] New: X86 DAG->DAG Instruction Selection: Assertion `NumBits >= MIN_INT_BITS && "bitwidth too small"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16083

            Bug ID: 16083
           Summary: X86 DAG->DAG Instruction Selection: Assertion `NumBits
                    >= MIN_INT_BITS && "bitwidth too small"' failed.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: kcc at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

LLVM r182352.
This is a very recent regression. 

long long a;
int b;
int fn1 () {
  return b || 0 & a;
}


% clang  -cc1 -triple i386-unknown-linux-gnu -emit-obj -x c bit.c 

clang: llvm/lib/IR/Type.cpp:306: static llvm::IntegerType
*llvm::IntegerType::get(llvm::LLVMContext &, unsigned int): Assertion `NumBits
>= MIN_INT_BITS && "bitwidth too small"' failed.
0  clang           0x00000000011fce25 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1  clang           0x00000000011fd313
2  libpthread.so.0 0x00007f2c9ae23cb0
3  libc.so.6       0x00007f2c9a062425 gsignal + 53
4  libc.so.6       0x00007f2c9a065b8b abort + 379
5  libc.so.6       0x00007f2c9a05b0ee
6  libc.so.6       0x00007f2c9a05b192
7  clang           0x0000000001149b2c
llvm::IntegerType::get(llvm::LLVMContext&, unsigned int) + 444
8  clang           0x0000000001153566
llvm::EVT::getExtendedIntegerVT(llvm::LLVMContext&, unsigned int) + 6
9  clang           0x0000000000badecb
llvm::TargetLowering::SimplifySetCC(llvm::EVT, llvm::SDValue, llvm::SDValue,
llvm::ISD::CondCode, bool, llvm::TargetLowering::DAGCombinerInfo&,
llvm::DebugLoc) const + 2475
10 clang           0x0000000000b14917
11 clang           0x0000000000aed701
12 clang           0x0000000000ad9afc
13 clang           0x0000000000ad94ed
llvm::SelectionDAG::Combine(llvm::CombineLevel, llvm::AliasAnalysis&,
llvm::CodeGenOpt::Level) + 733
14 clang           0x0000000000b91557
llvm::SelectionDAGISel::CodeGenAndEmitDAG() + 871
15 clang           0x0000000000b90989
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 6265
16 clang           0x0000000000b8e456
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 1302
17 clang           0x0000000000cd0e1d
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 125
18 clang           0x000000000113f78c
llvm::FPPassManager::runOnFunction(llvm::Function&) + 364
19 clang           0x000000000113f9fb
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
20 clang           0x000000000113fd4e
llvm::MPPassManager::runOnModule(llvm::Module&) + 430
21 clang           0x00000000011403eb llvm::PassManagerImpl::run(llvm::Module&)
+ 539
22 clang           0x000000000114055a llvm::PassManager::run(llvm::Module&) +
10
23 clang           0x000000000121a647
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 5943
24 clang           0x0000000001217cbb
25 clang           0x00000000014ad433 clang::ParseAST(clang::Sema&, bool, bool)
+ 515
26 clang           0x0000000001216fd2 clang::CodeGenAction::ExecuteAction() +
194
27 clang           0x00000000013fc621 clang::FrontendAction::Execute() + 113
28 clang           0x00000000013dc94d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 909
29 clang           0x00000000011ffc84
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 3028
30 clang           0x0000000000631c44 cc1_main(char const**, char const**, char
const*, void*) + 708
31 clang           0x000000000062f5fb main + 7083
32 libc.so.6       0x00007f2c9a04d76d __libc_start_main + 237
33 clang           0x000000000062d919
Stack dump:
0.    Program arguments: clang -cc1 -triple i386-unknown-linux-gnu -emit-obj -x
c bit.c 
1.    <eof> parser at end of file
2.    Code generation
3.    Running pass 'Function Pass Manager' on module 'bit.c'.
4.    Running pass 'X86 DAG->DAG Instruction Selection' on function '@fn1'
Aborted (core dumped)

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