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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 - InstCombine incorrectly shrinks the size of store"
href="https://bugs.llvm.org/show_bug.cgi?id=44306">44306</a>
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<th>Summary</th>
<td>InstCombine incorrectly shrinks the size of store
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>juneyoung.lee@sf.snu.ac.kr
</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=22938" name="attach_22938" title="input.ll">attachment 22938</a> <a href="attachment.cgi?id=22938&action=edit" title="input.ll">[details]</a></span>
input.ll
```
$ cat input.ll
define void @PR37526(i32* %pz, i32* %px, i32* %py) {
%t2 = load i32, i32* %py
%t3 = load i32, i32* %px
%cmp = icmp slt i32 %t2, %t3
%select = select i1 %cmp, i32* %px, i32* %py
%bc = bitcast i32* %select to i64*
%r = load i64, i64* %bc
%t1 = bitcast i32* %pz to i64*
store i64 %r, i64* %t1
ret void
}
$ opt -instcombine -S -o - input.ll
define void @PR37526(i32* %pz, i32* %px, i32* %py) {
%t2 = load i32, i32* %py, align 4
%t3 = load i32, i32* %px, align 4
%cmp = icmp slt i32 %t2, %t3
%r1 = select i1 %cmp, i32 %t3, i32 %t2
store i32 %r1, i32* %pz, align 4
ret void
}
```
After InstCombine, the i64 store in source is shrinked into i32 store, which is
incorrect.</pre>
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