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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - indvars makes function broken with "opt -newgvn -reg2mem -licm -ipconstprop -loop-interchange -jump-threading -lcssa -indvars""
href="https://bugs.llvm.org/show_bug.cgi?id=42660">42660</a>
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<tr>
<th>Summary</th>
<td>indvars makes function broken with "opt -newgvn -reg2mem -licm -ipconstprop -loop-interchange -jump-threading -lcssa -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=22254" name="attach_22254" title=".bc file of the source code">attachment 22254</a> <a href="attachment.cgi?id=22254&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 -newgvn -reg2mem -licm -ipconstprop -loop-interchange -jump-threading
-lcssa -indvars small.bc -o small-opt.bc
PHI nodes must have at least one entry. If the block is dead, the PHI should
be removed!
%cleanup.dest23.lcssa37.lcssa38 = phi i32
PHI nodes must have at least one entry. If the block is dead, the PHI should
be removed!
%.lcssa55 = phi i8*
in function d
LLVM ERROR: Broken function found, compilation aborted!
------------------------------------------------------------
short a;
short(c)();
static int d(g) {
if (c())
h:
for (;;) {
int e;
if (g)
continue;
for (;;) {
char *b, *l;
int m, f, i, j, k;
if (a)
goto h;
}
}
return d(1);
}</pre>
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