[LLVMbugs] [Bug 14601] New: Assertion in SROA when alloca is memset'ted with variable length

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14601

             Bug #: 14601
           Summary: Assertion in SROA when alloca is memset'ted with
                    variable length
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: opt
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: jvoung at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 9697
  --> http://llvm.org/bugs/attachment.cgi?id=9697
reproducer

With the attached temp2.ll run:

> opt -o bugpoint-output.bc -sroa temp2.ll

See the log:

opt: /usr/local/home/llvm-w-git/llvm/lib/Transforms/Scalar/SROA.cpp:2321: bool
{anonymous}::AllocaPartitionRewriter::visitUsers({anonymous}::AllocaPartitioning::const_use_iterator,
{anonymous}::AllocaPartitioning::const_use_iterator): Assertion `CanSROA'
failed.
0  opt             0x000000000119d43f
1  opt             0x000000000119d969
2  libpthread.so.0 0x00007f6270d40cb0
3  libc.so.6       0x00007f626ff92425 gsignal + 53
4  libc.so.6       0x00007f626ff95b8b abort + 379
5  libc.so.6       0x00007f626ff8b0ee
6  libc.so.6       0x00007f626ff8b192
7  opt             0x0000000000d40e35
8  opt             0x0000000000d453ca
9  opt             0x0000000000d456e6
10 opt             0x00000000011317af
llvm::FPPassManager::runOnFunction(llvm::Function&) + 607
11 opt             0x000000000113181b
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
12 opt             0x0000000001131470
llvm::MPPassManager::runOnModule(llvm::Module&) + 688
13 opt             0x0000000001134607 llvm::PassManagerImpl::run(llvm::Module&)
+ 247
14 opt             0x00000000005522d7 main + 5815
15 libc.so.6       0x00007f626ff7d76d __libc_start_main + 237
16 opt             0x0000000000568425
Stack dump:
0.    Program arguments: opt -o bugpoint-output.bc -sroa temp2.ll 
1.    Running pass 'Function Pass Manager' on module 'temp2.ll'.
2.    Running pass 'SROA' on function '@channel_post_port_listener'
Aborted (core dumped)

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