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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 - newgvn crashes with "opt -functionattrs -simplifycfg -gvn -newgvn": Assertion `BeforeCC->isEquivalentTo(AfterCC) && "Value number changed after main loop completed!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=42422">42422</a>
</td>
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<tr>
<th>Summary</th>
<td>newgvn crashes with "opt -functionattrs -simplifycfg -gvn -newgvn": Assertion `BeforeCC->isEquivalentTo(AfterCC) && "Value number changed after main loop completed!"' 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=22152" name="attach_22152" title=".bc file of the source code">attachment 22152</a> <a href="attachment.cgi?id=22152&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 363125)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/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 -functionattrs -simplifycfg -gvn -newgvn small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/Scalar/NewGVN.cpp:3296:
void {anonymous}::NewGVN::verifyIterationSettled(llvm::Function&): Assertion
`BeforeCC->isEquivalentTo(AfterCC) && "Value number changed after main loop
completed!"' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt -functionattrs
-simplifycfg -gvn -newgvn small.bc -o small-opt.bc
1. Running pass 'CallGraph Pass Manager' on module 'small.bc'.
2. Running pass 'Global Value Numbering' on function '@d'
#0 0x000055ad55b3f87a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x257887a)
#1 0x000055ad55b3d534 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2576534)
#2 0x000055ad55b3d672 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2576672)
#3 0x00007f1105787890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007f1104439e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007f110443b801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007f110442b39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007f110442b412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x000055ad559e61e2 (anonymous namespace)::NewGVN::runGVN()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x241f1e2)
#9 0x000055ad559e7abf (anonymous
namespace)::NewGVNLegacyPass::runOnFunction(llvm::Function&) (.part.1399)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2420abf)
#10 0x000055ad554f8189 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x1f31189)
#11 0x000055ad54de2793 (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x181b793)
#12 0x000055ad554f73e1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x1f303e1)
#13 0x000055ad53de00a9 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x8190a9)
#14 0x00007f110441cb97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000055ad53e653fa _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x89e3fa)
Aborted (core dumped)
----------------------------------------------
int a, b, c;
char d() {
long e;
for (;;) {
int f = 0;
for (; f <= 1; f++) {
long g = 4;
for (; a;)
return 4;
for (;;) {
int h;
if (b)
break;
e = 0;
for (; e <= 1; e++)
;
if (g)
return c;
}
}
}
}</pre>
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