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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - After r315899, comments after x86 prefixes cause errors"
href="https://bugs.llvm.org/show_bug.cgi?id=35741">35741</a>
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<th>Summary</th>
<td>After r315899, comments after x86 prefixes cause errors
</td>
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<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>release blocker
</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
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</tr>
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<th>Reporter</th>
<td>dimitry@andric.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
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<pre>In <a href="https://reviews.llvm.org/rL315899">https://reviews.llvm.org/rL315899</a> (fixing x86 prefix issues related to bug
7709, <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [x86 disassembler] Wrong disassemble for some SSE2 instructions."
href="show_bug.cgi?id=17697">bug 17697</a>, <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [x86 disassembler] prefix ordering may ignore opsize and rep[n]e prefixes"
href="show_bug.cgi?id=19251">bug 19251</a>, <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [x86 disassembler] 'xchg' instruction uses two different sized register operands with data16 prefix"
href="show_bug.cgi?id=32809">bug 32809</a> and <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - X86 disassembler skips over some bytes"
href="show_bug.cgi?id=21640">bug 21640</a>), assembler comments after
such prefixes are no longer accepted, while they obviously should be.
For example, this assembly:
rep # comment
movsb
Both GNU as and clang before r315899 compile this just fine, but clang r315899
and later produce:
$ ~/llvm-trunk-r315899/bin/clang -c rep.s
rep.s:1:1: error: invalid instruction mnemonic '# comment'
rep # comment
^~~~~~~~~
Please fix this, or revert r315899 before 6.0.0 branches off.</pre>
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