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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang doesn't react to some constraints in inline asm instructions"
href="http://llvm.org/bugs/show_bug.cgi?id=15211">15211</a>
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<th>Summary</th>
<td>Clang doesn't react to some constraints in inline asm instructions
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>3.2
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>MacOS X
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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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>ili.filippov@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>We can write simple test:
void f() {
register int in asm("ebx") = 0;
__asm("test %h0, %h0" : : "A"(in));
}
and watch clang's assembler for it.
We will see:
movl $0, -12(%rbp)
movl -12(%rbp), %ebx
## InlineAsm Start
test %bh, %bh
## InlineAsm End
But constraint "A" says, that input parameter must be placed in eax.
Other constraints have the same errors.
--
Software Engineer
Intel Compiler Team
Intel Corp.</pre>
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