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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - GCC and LLVM pass i128 incompatibly on x86_64-windows-gnu"
href="https://bugs.llvm.org/show_bug.cgi?id=39492">39492</a>
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<th>Summary</th>
<td>GCC and LLVM pass i128 incompatibly on x86_64-windows-gnu
</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>Windows NT
</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>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>Consider this code:
typedef int my_int128_t __attribute__((mode(TI)));
my_int128_t foo() { return -2; }
GCC:
foo:
.seh_endprologue
movdqa .LC0(%rip), %xmm0
ret
Clang:
foo: # @foo
# %bb.0: # %entry
movq $-2, %rax
movq $-1, %rdx
retq
So, XMM0 vs. RAX:RDX.
I noticed this because clang fails to call its own 128-bit compiler rt division
functions correctly. Apparently I committed a patch back in r208029 to add a
special case to make __divti3 match GCC. If we fix this bug, we won't need that
hack anymore.</pre>
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