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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - _ARCH_PWR6X defined for incompatible processors"
href="https://bugs.llvm.org/show_bug.cgi?id=40236">40236</a>
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<th>Summary</th>
<td>_ARCH_PWR6X defined for incompatible processors
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
<tr>
<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>echristo@gmail.com, hfinkel@anl.gov, kit.barton@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, nemanja.i.ibm@gmail.com, richard-llvm@metafoo.co.uk, wschmidt@linux.vnet.ibm.com
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<pre>The predefined macro `_ARCH_PWR6X` is associated with GCC's `-mcpu=power6x`
option. `-mcpu=power6x` enables generation of P6 "raw mode" instructions such
as `mftgpr`; say for,
```
long long f(double x) {
long long l;
__builtin_memcpy(&l, &x, sizeof(long long));
return l;
}
```
In other words, `_ARCH_PWR6X` indicates that "raw mode" instructions are
acceptable.
Since `mftgpr` generates SIGILL on POWER8, etc., defining `_ARCH_PWR6X` for
such targets is incorrect.
### SOURCE (<stdin>):
#ifdef _ARCH_PWR6X
#error
#endif
### COMPILER INVOCATION:
clang -cc1 -triple powerpc64le-unknown-linux-gnu -target-cpu pwr8 -x c -
### COMPILER OUTPUT:
<stdin>:2:2: error:
#error
^
1 error generated.
### EXPECTED OUTPUT:
(Clean compile).
### COMPILER VERSION INFO (clang -v):
clang version 8.0.0 (<a href="https://github.com/llvm-mirror/clang.git">https://github.com/llvm-mirror/clang.git</a>
b4ac732910ee32d004284aaa0632e5bb2fecc5fd)
(<a href="https://github.com/llvm-mirror/llvm.git">https://github.com/llvm-mirror/llvm.git</a>
1011e428fd0908dbabe4c6387ef65ba1f92c39a2)
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/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
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