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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 - hotcoldsplit makes function broken with "opt -loop-unroll -mergereturn -hotcoldsplit -loop-rotate -sroa -inline -barrier -loop-idiom -early-cse -hotcoldsplit""
href="https://bugs.llvm.org/show_bug.cgi?id=42451">42451</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>hotcoldsplit makes function broken with "opt -loop-unroll -mergereturn -hotcoldsplit -loop-rotate -sroa -inline -barrier -loop-idiom -early-cse -hotcoldsplit"
</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=22168" name="attach_22168" title=".bc file of the source code">attachment 22168</a> <a href="attachment.cgi?id=22168&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 -loop-unroll -mergereturn -hotcoldsplit -loop-rotate -sroa -inline
-barrier -loop-idiom -early-cse -hotcoldsplit small.bc -o small-opt.bc
Instruction does not dominate all uses!
%k.sroa.5.i = alloca [6 x i8], align 8
%0 = bitcast [6 x i8]* %k.sroa.5.i to i8*
in function main
LLVM ERROR: Broken function found, compilation aborted!
-------------------------------------------------------
int a, b, c, g, h;
int i[2];
short l(d) {
int e = 0;
char f[6];
for (; e < 6; e++)
f[e] = 3;
return 1;
}
int *m();
short o(int *j) {
short k[3][3][2] = {1};
k[2][1][1];
k[1][2][1];
return c;
}
void p() { m(); }
int *m() {
{
int n;
b++;
for (; 0;) {
g;
g++;
for (; 0; 1)
return 0;
}
a--;
}
for (;;)
;
}
void main() { h || l(o((p(), i))); }</pre>
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