https://llvm.org/bugs/show_bug.cgi?id=25040
Bug ID: 25040
Summary: clang crashes on valid code at -O2 and -O3 on
x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The current clang trunk crashes when compiling the following test case at -O2
and -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
This is a regression from 3.7.x.
$ clang-trunk -v
clang version 3.8.0 (trunk 249243)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.1.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.1.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang-trunk -Os -c small.c
$ clang-3.7.0 -O2 -c small.c
$
$ clang-trunk -O2 -c small.c
clang: /tmp/llvm/lib/Analysis/InstructionSimplify.cpp:2140: bool
implies(llvm::Value *, llvm::Value *): Assertion `A->getType()->isIntegerTy(1)
&& B->getType()->isIntegerTy(1)' failed.
#0 0x2e3809d llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2e3809d)
#1 0x2e37726 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang+0x2e37726)
#2 0x2e398be (/usr/local/clang-trunk/bin/clang+0x2e398be)
#3 0x7fe85a0b7340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x7fe859052cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x7fe8590560d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#6 0x7fe85904bb86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#7 0x7fe85904bc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x2a9f435 (/usr/local/clang-trunk/bin/clang+0x2a9f435)
#9 0x2a92551 (/usr/local/clang-trunk/bin/clang+0x2a92551)
#10 0x2a92fcf (/usr/local/clang-trunk/bin/clang+0x2a92fcf)
#11 0x2a9b37f llvm::SimplifyInstruction(llvm::Instruction*, llvm::DataLayout
const&, llvm::TargetLibraryInfo const*, llvm::DominatorTree const*,
llvm::AssumptionCache*) (/usr/local/clang-trunk/bin/clang+0x2a9b37f)
#12 0x2982fb7 llvm::UnrollLoop(llvm::Loop*, unsigned int, unsigned int, bool,
bool, unsigned int, llvm::LoopInfo*, llvm::Pass*, llvm::LPPassManager*,
llvm::AssumptionCache*) (/usr/local/clang-trunk/bin/clang+0x2982fb7)
#13 0x27adbf6 (/usr/local/clang-trunk/bin/clang+0x27adbf6)
#14 0x2ad488e llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2ad488e)
#15 0x2d87d84 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2d87d84)
#16 0x2d87fcb llvm::FPPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2d87fcb)
#17 0x2d884a5 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2d884a5)
#18 0x9e2683 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::StringRef, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) (/usr/local/clang-trunk/bin/clang+0x9e2683)
#19 0x9c4d33 (/usr/local/clang-trunk/bin/clang+0x9c4d33)
#20 0xc522b6 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xc522b6)
#21 0x77b055 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x77b055)
#22 0x74819b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x74819b)
#23 0x727a07 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x727a07)
#24 0x71da53 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x71da53)
#25 0x725f93 main (/usr/local/clang-trunk/bin/clang+0x725f93)
#26 0x7fe85903dec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#27 0x71d4e9 _start (/usr/local/clang-trunk/bin/clang+0x71d4e9)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-target-linker-version 2.24 -momit-leaf-frame-pointer -dwarf-column-info
-coverage-file /data2/small.c -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.8.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.8.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir /data2
-ferror-limit 19 -fmessage-length 127 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o small.o -x c small.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'Function Pass Manager' on module 'small.c'.
4. Running pass 'Loop Pass Manager' on function '@fn1'
5. Running pass 'Unroll loops' on basic block '%for.cond.1.preheader'
clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.8.0 (trunk 249243)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
clang: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/small-98c2c4.c
clang: note: diagnostic msg: /tmp/small-98c2c4.sh
clang: note: diagnostic msg:
********************
$
-----------------------------------------------
int a, b, c[7], d, e;
void
fn1 ()
{
for (e = 0; e < 2; e++)
for (d = 0; d < 6; d++)
for (b = 0; b < 2; b++)
{
int *f = &c[d];
*f = c[d] < ((a >> (c[d] < 0)) == 0);
}
}
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