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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 - [ms_abi] Big structures arguments are not passed correctly (x64)"
href="https://bugs.llvm.org/show_bug.cgi?id=33834">33834</a>
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<th>Summary</th>
<td>[ms_abi] Big structures arguments are not passed correctly (x64)
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>3.9
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>piotr@codeweavers.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>An example of function that will be called incorrectly:
typedef struct {
int big[8];
} big;
extern void __attribute__((ms_abi)) call_func_with_struct_args(big a, big b,
big c, big d, big e);
...
big args[5];
memset(args, 0, sizeof(args));
call_func_with_struct_args(args[0], args[1], args[2], args[3], args[4]);
MSVC passes all structures indirectly (even for arguments passed on stack).
Clang passes first four arguments as pointers. Fifth argument is passed
incorrectly (this breaks some functionality in wine project).</pre>
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