[LLVMbugs] [Bug 21651] New: opt crash

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21651

            Bug ID: 21651
           Summary: opt crash
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

regehr at regehr-M51AC:~$ llvm-as < foo.ll | opt -O3
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

#0 0x137f812 llvm::sys::PrintStackTrace(_IO_FILE*)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x137f812)
#1 0x137d9a1 SignalHandler(int)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x137d9a1)
#2 0x7f3583734340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#3 0xfcd050 llvm::DataLayout::getLargestLegalIntTypeSize() const
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0xfcd050)
#4 0x1106f0e llvm::InstCombiner::visitSwitchInst(llvm::SwitchInst&)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x1106f0e)
#5 0x1110eee llvm::InstCombiner::DoOneIteration(llvm::Function&, unsigned int)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x1110eee)
#6 0x1111e18 llvm::InstCombiner::runOnFunction(llvm::Function&)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x1111e18)
#7 0x107644f llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x107644f)
#8 0x10b2d29 (anonymous namespace)::CGPassManager::runOnModule(llvm::Module&)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x10b2d29)
#9 0x1076bfd llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x1076bfd)
#10 0x604a5f main
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x604a5f)
#11 0x7f3582934ec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#12 0x627e01 _start
(/home/regehr/z/compiler-install/llvm-r222644-install/bin/opt+0x627e01)
Stack dump:
0.    Program arguments: opt -O3 
1.    Running pass 'CallGraph Pass Manager' on module '<stdin>'.
2.    Running pass 'Combine redundant instructions' on function '@foo'
Segmentation fault (core dumped)


regehr at regehr-M51AC:~$ opt --version
LLVM (http://llvm.org/):
  LLVM version 3.6.0svn
  Optimized build with assertions.
  Built Nov 23 2014 (21:45:31).
  Default target: x86_64-unknown-linux-gnu
  Host CPU: core-avx2


regehr at regehr-M51AC:~$ cat foo.ll
@dummy1 = global i32 0, align 4
@dummy2 = global i32 0, align 4
@dummy3 = global i32 0, align 4
define void @foo(i64 %x1) {
foo0:
  %0 = and i64 3, %x1
  %1 = icmp eq i64 2, %0
  %2 = icmp eq i64 0, %0
  %3 = and i64 1, %x1
  %tmp0 = icmp eq i1 0, %1
  br i1 %tmp0, label %cont0, label %out
cont0:
  %tmp1 = icmp eq i1 0, %2
  br i1 %tmp1, label %cont1, label %out
cont1:
  %cand = icmp eq i64 1, %3
  br i1 %cand, label %return, label %dead
return:
  %dummy1w = atomicrmw add i32* @dummy1, i32 1 monotonic
  ret void
dead:
  %dummy2w = atomicrmw add i32* @dummy2, i32 1 monotonic
  ret void
out:
  %dummy3w = atomicrmw add i32* @dummy3, i32 1 monotonic
  ret void
}

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