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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SimplifyLibCalls doesn't handle attributes on call sites well"
href="https://bugs.llvm.org/show_bug.cgi?id=49984">49984</a>
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<th>Summary</th>
<td>SimplifyLibCalls doesn't handle attributes on call sites well
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jdoerfert@anl.gov
</td>
</tr>
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<th>CC</th>
<td>david.bolvansky@gmail.com, florian_hahn@apple.com, listmail@philipreames.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>When we have an attribute on a call site that is changed, SimplifyLibCalls
causes an assertion. The code shows one example, others are likely.
Test taken from `0c0de794f1affc7460eb90626b8483e4a0cbde6c`:
<a href="https://godbolt.org/z/vG7acndfz">https://godbolt.org/z/vG7acndfz</a>
```
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
@null = constant [1 x i8] zeroinitializer
define i8* @test3(i8* %dst, i32 %n) {
%src = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
%ret = call i8* @strncpy(i8* align(16) noalias nonnull %dst, i8* nonnull
%src, i32 5)
ret i8* %ret
}
declare i8* @strncpy(i8*, i8*, i32)
```</pre>
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