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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang crashes with "-mllvm -enable-newgvn": error in backend: No support for lowering a copy into EFLAGS when used by this instruction!"
href="https://bugs.llvm.org/show_bug.cgi?id=37431">37431</a>
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<th>Summary</th>
<td>clang crashes with "-mllvm -enable-newgvn": error in backend: No support for lowering a copy into EFLAGS when used by this instruction!
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>helloqirun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>It happens in 32-bit mode and "-O3".
$ clang-trunk -v
clang version 7.0.0 (trunk 332156)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ clang-trunk -mllvm -enable-newgvn -m32 -O3 abc.c
fatal error: error in backend: No support for lowering a copy into EFLAGS when
used by this instruction!
clang-7: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 7.0.0 (trunk 332156)
Target: i386-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-7: 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-7: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-7: note: diagnostic msg: /tmp/abc-1cee0a.c
clang-7: note: diagnostic msg: /tmp/abc-1cee0a.sh
clang-7: note: diagnostic msg:
********************
$ cat abc.c
char a, b, c;
char *d;
long e;
void fn1() {
long *f = &e;
char *g = &b;
short h;
unsigned long long i = e;
for (; h <= 3; h += 1) {
i && (c = 2);
*g = *f = 0;
a = e || *d;
}
c %= *g -= i > a;
}</pre>
</div>
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