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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 - Incorrect warning for mempcpy"
href="https://bugs.llvm.org/show_bug.cgi?id=37571">37571</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Incorrect warning for mempcpy
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<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>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Hello,
void* foo(const void *src, void *dst, size_t n) {
return mempcpy(dst, src, n);
}
Clang -O0 warns:
mm.c:6:12: warning: incompatible integer to pointer conversion returning 'int'
from a function with result type 'void *' [-Wint-conversion]
return mempcpy(dst, src, n);
Clang -O3 (to show smaller IR code):
define dso_local i8* @foo(i8* %src, i8* %dst, i64 %n) local_unnamed_addr #0 {
entry:
%call = tail call i32 (i8*, i8*, i64, ...) bitcast (i32 (...)* @mempcpy to
i32 (i8*, i8*, i64, ...)*)(i8* %dst, i8* %src, i64 %n) #3
%conv = sext i32 %call to i64
%0 = inttoptr i64 %conv to i8*
ret i8* %0
}
declare dso_local i32 @mempcpy(...)
Signature:
void *mempcpy(void *dest, const void *src, size_t n);</pre>
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