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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 - loop-interchange makes function broken with "opt -instcombine -licm -structurizecfg -jump-threading -loop-rotate -instcombine -loop-interchange""
href="https://bugs.llvm.org/show_bug.cgi?id=41725">41725</a>
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<th>Summary</th>
<td>loop-interchange makes function broken with "opt -instcombine -licm -structurizecfg -jump-threading -loop-rotate -instcombine -loop-interchange"
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<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=21889" name="attach_21889" title=".bc file of the source code">attachment 21889</a> <a href="attachment.cgi?id=21889&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 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/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/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
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 -instcombine -licm -structurizecfg -jump-threading -loop-rotate
-instcombine -loop-interchange small.bc -o small-opt.bc
Instruction does not dominate all uses!
%8 = add nsw i32 %storemerge14, -1
%.lcssa = phi i32 [ %8, %Flow3 ]
in function d
LLVM ERROR: Broken function found, compilation aborted!
without scalarizer pass, opt works fine.
$opt -instcombine -licm -structurizecfg -jump-threading -loop-rotate
-instcombine small.bc -o small-opt.bc
------------------------------------------------------
int a, b;
int c[10][1];
int d() {
a = 0;
for (; a <= 1; a++) {
b = 5;
for (; b; b--)
c[b][a] = 0;
}
}</pre>
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