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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - AsmParser::parseMSInlineAsm() incorrectly assumes whitespace when rewriting expressions"
href="https://bugs.llvm.org/show_bug.cgi?id=35441">35441</a>
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<th>Summary</th>
<td>AsmParser::parseMSInlineAsm() incorrectly assumes whitespace when rewriting expressions
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>vadim@penzin.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=19480" name="attach_19480" title="Patch against revision 319067">attachment 19480</a> <a href="attachment.cgi?id=19480&action=edit" title="Patch against revision 319067">[details]</a></span>
Patch against revision 319067
Microsoft C/C++ compiler allows the following syntax:
__asm { mov[foo],2017 }
(Note the absence of whitespace between the opcode "mov" and the left bracket.)
AsmParser::parseMSInlineAsm() rewrites the above fragment as "movdword ptr
$0,$$2017" while the expected result is "mov dword ptr $0,$$2017" (note the
whitespace between the opcode "mov" and the size specifier "dword ptr").
To reproduce the above, please consider the following C source (foo.c):
#include <stdint.h>
int
foo ( void )
{
int32_t bar = 0;
__asm {
mov[bar],2017
}
return bar;
}
Please verify generation of the bitcode of the above as follows:
clang-6.0 -S -fasm-blocks -emit-llvm foo.c -o - | grep dword
Please find attached a patch that amends this issue.</pre>
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