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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt crashes with "opt -simplifycfg -early-cse-memssa -die -gvn-hoist": Assertion `AL->size() == ActualAccesses.size() && "We don't have the same number of accesses in the block as on the " "access list"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=42264">42264</a>
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<tr>
<th>Summary</th>
<td>opt crashes with "opt -simplifycfg -early-cse-memssa -die -gvn-hoist": Assertion `AL->size() == ActualAccesses.size() && "We don't have the same number of accesses in the block as on the " "access list"' 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>
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<pre>Created <span class=""><a href="attachment.cgi?id=22088" name="attach_22088" title=".bc file of the source code">attachment 22088</a> <a href="attachment.cgi?id=22088&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 9.0.0 (trunk 362492)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/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 -mllvm -disable-llvm-optzns small.c
$opt -simplifycfg -early-cse-memssa -die -gvn-hoist small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Analysis/MemorySSA.cpp:1940:
void llvm::MemorySSA::verifyOrdering(llvm::Function&) const: Assertion
`AL->size() == ActualAccesses.size() && "We don't have the same number of
accesses in the block as on the " "access list"' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt -simplifycfg
-early-cse-memssa -die -gvn-hoist small.bc -o small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
#0 0x0000557c3bb85cea llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x255bcea)
#1 0x0000557c3bb839a4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x25599a4)
#2 0x0000557c3bb83ae2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x2559ae2)
#3 0x00007fd4298a5890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007fd428557e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007fd428559801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007fd42854939a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007fd428549412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x0000557c3af26ec3 llvm::MemorySSA::verifyOrdering(llvm::Function&) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x18fcec3)
#9 0x0000557c3af2b505 llvm::MemorySSA::verifyMemorySSA() const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1901505)
#10 0x0000557c3b53e949
llvm::PMDataManager::verifyPreservedAnalysis(llvm::Pass*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f14949)
#11 0x0000557c3b542ce8 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f18ce8)
#12 0x0000557c3b543061 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f19061)
#13 0x0000557c3b5421c1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f181c1)
#14 0x0000557c39e3c889 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x812889)
#15 0x00007fd42853ab97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x0000557c39ec0aba _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x896aba)
Aborted (core dumped)
---------------------------------------------
int a=0;
void b() {
int *c = &a;
if (*c)
;
}</pre>
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