Assertion `(KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"' failed. #9484
Description
| Bugzilla Link | 9112 |
| Resolution | FIXED |
| Resolved on | Feb 10, 2011 17:55 |
| Version | trunk |
| OS | Linux |
Extended Description
[regehr@gamow tmp446]$ clang -O2 -c small.c
clang: ValueTracking.cpp:410: void llvm::ComputeMaskedBits(llvm::Value*, const llvm::APInt&, llvm::APInt&, llvm::APInt&, const llvm::TargetData*, unsigned int): Assertion `(KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"' failed.
0 clang 0x00000000017e44df
1 clang 0x00000000017e6752
2 libpthread.so.0 0x00007ffff7bd2190
3 libc.so.6 0x00007ffff6ed74b5 gsignal + 53
4 libc.so.6 0x00007ffff6edaf50 abort + 384
5 libc.so.6 0x00007ffff6ed0481 __assert_fail + 241
6 clang 0x0000000001674027 llvm::ComputeMaskedBits(llvm::Value*, llvm::APInt const&, llvm::APInt&, llvm::APInt&, llvm::TargetData const*, unsigned int) + 12199
7 clang 0x000000000167625e llvm::ComputeSignBit(llvm::Value*, bool&, bool&, llvm::TargetData const*, unsigned int) + 622
8 clang 0x0000000001607158
9 clang 0x0000000001608d26
10 clang 0x0000000001607205
11 clang 0x0000000001608681 llvm::SimplifyInstruction(llvm::Instruction*, llvm::TargetData const*, llvm::DominatorTree const*) + 1313
12 clang 0x00000000015ad7e1 llvm::SimplifyInstructionsInBlock(llvm::BasicBlock*, llvm::TargetData const*) + 193
13 clang 0x00000000014db7d5
14 clang 0x00000000014dd9b5
15 clang 0x00000000014de3bd
16 clang 0x000000000172dbad llvm::FPPassManager::runOnFunction(llvm::Function&) + 557
17 clang 0x00000000015dbeab
18 clang 0x00000000015dc605
19 clang 0x000000000172f3d4 llvm::MPPassManager::runOnModule(llvm::Module&) + 500
20 clang 0x000000000172f547 llvm::PassManagerImpl::run(llvm::Module&) + 167
21 clang 0x00000000008136a9 clang::EmitBackendOutput(clang::Diagnostic&, clang::CodeGenOptions const&, clang::TargetOptions const&, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) + 1625
22 clang 0x0000000000810a1b clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) + 251
23 clang 0x000000000092c403 clang::ParseAST(clang::Sema&, bool) + 291
24 clang 0x0000000000810194 clang::CodeGenAction::ExecuteAction() + 68
25 clang 0x00000000006ff815 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 357
26 clang 0x00000000006d9c8c clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1276
27 clang 0x00000000006d147b cc1_main(char const**, char const**, char const*, void*) + 539
28 clang 0x00000000006d8dcd main + 4605
29 libc.so.6 0x00007ffff6ec2abd __libc_start_main + 253
30 clang 0x00000000006cfc59
Stack dump:
0. Program arguments: /uusoc/exports/scratch/regehr/z/compiler-install/llvm-gcc-r124573-install/bin/clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c -mrelocation-model static -mdisable-fp-elim -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version 2.20 -resource-dir /uusoc/exports/scratch/regehr/z/compiler-install/llvm-gcc-r124573-install/bin/../lib/clang/2.9 -O2 -ferror-limit 19 -fmessage-length 99 -fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o small.o -x c small.c
- parser at end of file
- Per-module optimization passes
- Running pass 'CallGraph Pass Manager' on module 'small.c'.
- Running pass 'Jump Threading' on function '@func'
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal 1 (use -v to see invocation)
[regehr@gamow tmp446]$ clang -v
clang version 2.9 (trunk 124573)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[regehr@gamow tmp446]$ cat small.c
int safe (void);
static unsigned short
foo (unsigned short ui1, unsigned char ui2)
{
return ui1 + ui2;
}
struct S0
{
unsigned char f3;
unsigned char f9;
};
struct S2
{
short f5;
};
struct S0 g_4 = {
0, 0
};
volatile struct S0 g_93 = {
0, 0
};
unsigned char *g_211 = &g_4.f3;
unsigned char **g = &g_211;
struct S2 g_412 = {
0
};
int
func_37 (void)
{
lbl_510:
if (foo (0, 1)) goto lbl_510;
return 0;
}
void
func (void)
{
if (func_37 ())
for (;; g_93.f9)
for (g_412.f5 = 0; g_412.f5 < 0; g_412.f5 = foo (g_412.f5, 0))
{
}
}