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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - gvn-hoist crashes: Assertion `MSSA->dominates(NewDef, FirstDef) && "Should have dominated the new access"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=42946">42946</a>
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</tr>
<tr>
<th>Summary</th>
<td>gvn-hoist crashes: Assertion `MSSA->dominates(NewDef, FirstDef) && "Should have dominated the new access"' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cszide@163.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22364" name="attach_22364" title=".bc file of the source code">attachment 22364</a> <a href="attachment.cgi?id=22364&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 10.0.0 (trunk 368431)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
$opt -deadargelim -reg2mem -instcombine -gvn-hoist small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Analysis/MemorySSAUpdater.cpp:429:
void llvm::MemorySSAUpdater::fixupDefs(const
llvm::SmallVectorImpl<llvm::WeakVH>&): Assertion `MSSA->dominates(NewDef,
FirstDef) && "Should have dominated the new access"' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt -deadargelim
-reg2mem -instcombine -gvn-hoist small.bc -o small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
2. Running pass 'Early GVN Hoisting of Expressions' on function '@d'
#0 0x0000556d1c55274a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x26ef74a)
#1 0x0000556d1c550424 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x26ed424)
#2 0x0000556d1c550562 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x26ed562)
#3 0x00007f0ae577d890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007f0ae442fe97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007f0ae4431801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007f0ae442139a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007f0ae4421412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x0000556d1b8aa6f0
llvm::MemorySSAUpdater::fixupDefs(llvm::SmallVectorImpl<llvm::WeakVH> const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x1a476f0)
#9 0x0000556d1b8aa967 llvm::MemorySSAUpdater::insertDef(llvm::MemoryDef*,
bool)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x1a47967)
#10 0x0000556d1b8ab58f void
llvm::MemorySSAUpdater::moveTo<llvm::MemorySSA::InsertionPlace>(llvm::MemoryUseOrDef*,
llvm::BasicBlock*, llvm::MemorySSA::InsertionPlace)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x1a4858f)
#11 0x0000556d1c2c922c
llvm::GVNHoist::hoist(llvm::SmallVector<std::pair<llvm::BasicBlock*,
llvm::SmallVector<llvm::Instruction*, 4u> >, 4u>&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x246622c)
#12 0x0000556d1c2d13a9 llvm::GVNHoist::hoistExpressions(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x246e3a9)
#13 0x0000556d1c2d1932 llvm::GVNHoist::run(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x246e932)
#14 0x0000556d1c2d1e2a llvm::GVNHoistLegacyPass::runOnFunction(llvm::Function&)
(.part.598)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x246ee2a)
#15 0x0000556d1bec4159 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x2061159)
#16 0x0000556d1bec4251 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x2061251)
#17 0x0000556d1bec33b1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x20603b1)
#18 0x0000556d1a6cf285 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x86c285)
#19 0x00007f0ae4412b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#20 0x0000556d1a75603a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build5/bin/opt+0x8f303a)
Aborted (core dumped)
---------------------------------------------------------------
char a;
short b;
char(c)();
static long d() {
{
int e;
if (c())
for (; 1; e){
if (b){
return 1;
}
else{
return a;
}
}
}
return a;
}</pre>
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