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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 - [PowerPC] Clang disagrees with GCC about type identity of AltiVec vector [un]signed long, mangles differently"
href="https://bugs.llvm.org/show_bug.cgi?id=47784">47784</a>
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<th>Summary</th>
<td>[PowerPC] Clang disagrees with GCC about type identity of AltiVec vector [un]signed long, mangles differently
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<tr>
<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, nemanja.i.ibm@gmail.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>The `vector unsigned long` type is treated by GCC as `vector unsigned int` in
32-bit mode and `vector unsigned long long` in 64-bit mode at the C++ type
system level. Clang does not match this behaviour. This leads to name mangling
differences.
Compiler Explorer link: <a href="https://godbolt.org/z/fsxxc5">https://godbolt.org/z/fsxxc5</a>
### SOURCE (<stdin>):
double f(vector unsigned long long);
double f(vector unsigned int);
double (*g(void))(vector unsigned long) {
return f;
}
### COMPILER INVOCATION:
clang -cc1 -fsyntax-only -triple powerpc64-unknown-linux-gnu -target-cpu pwr7
-xc++ -
### ACTUAL OUTPUT:
<stdin>:4:35: warning: Use of 'long' with '__vector' is deprecated
[-Wdeprecated]
double (*g(void))(vector unsigned long) {
^
<stdin>:5:10: error: address of overloaded function 'f' does not match required
type 'double (__vector unsigned long)'
return f;
^
<stdin>:2:8: note: candidate function has type mismatch at 1st parameter
(expected '__vector unsigned long' (vector of 2 'unsigned long' values) but has
'__vector unsigned int' (vector of 4 'unsigned int' values))
double f(vector unsigned int);
^
<stdin>:1:8: note: candidate function has type mismatch at 1st parameter
(expected '__vector unsigned long' (vector of 2 'unsigned long' values) but has
'__vector unsigned long long' (vector of 2 'unsigned long long' values))
double f(vector unsigned long long);
^
1 warning and 1 error generated.
### EXPECTED OUTPUT:
(clean compile)
### COMPILER VERSION INFO (clang++ -v):
clang version 12.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
68e1a8d20795802077987529e1268c184d749564)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
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/7.5.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64</pre>
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