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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 - clang cannot emit physreg copy instruction after optimizating with "opt -load-store-vectorizer -instcombine -loop-rotate -gvn -indvars -indvars"
href="https://bugs.llvm.org/show_bug.cgi?id=42452">42452</a>
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</tr>
<tr>
<th>Summary</th>
<td>clang cannot emit physreg copy instruction after optimizating with "opt -load-store-vectorizer -instcombine -loop-rotate -gvn -indvars -indvars
</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=22169" name="attach_22169" title=".bc file of the source code">attachment 22169</a> <a href="attachment.cgi?id=22169&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 -load-store-vectorizer -instcombine -loop-rotate -gvn -indvars -indvars
small.bc -o small-opt.bc
$clang -debug small-opt.bc -o small.out
fatal error: error in backend: Cannot emit physreg copy instruction
clang-9: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
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
clang-9: note: diagnostic msg: PLEASE submit a bug report to
<a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash backtrace, preprocessed source,
and associated run script.
clang-9: note: diagnostic msg: Error generating preprocessed source(s) - no
preprocessable inputs.
---------------------------------------------------------------
short a;
unsigned long ***b;
char c;
int d;
void main() {
unsigned long **e;
unsigned long ***f[] = {&e, &e};
c = 0;
for (; c <= 9; ++c)
a = d;
b = f[1];
}</pre>
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