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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incorrect assembly around 'div' instruction on x86-64"
href="http://llvm.org/bugs/show_bug.cgi?id=16105">16105</a>
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<th>Summary</th>
<td>Incorrect assembly around 'div' instruction on x86-64
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>andrew.macp@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In LLVM 3.3 from subversion (currently rev 182439) passing the following IR
into "lli -O0" prints an invalid character, whereas with -O1 or above or with
any opt level in LLVM 3.2 the number '9' is correctly output (followed by some
junk):
define void @main() {
entry:
%a = call i8* @malloc(i32 2)
%acast = bitcast i8* %a to [0 x i8]*
%elemptr = getelementptr inbounds [0 x i8]* %acast, i32 0, i32 0
; input is here (9)
%y = urem i8 9, 10
%z = add i8 48, %y
store i8 %z, i8* %elemptr
call void @printf(i8* %elemptr)
ret void
}
declare void @printf(i8*)
declare i8* @malloc(i32)
Dumping the assembly using "llc -O0" (3.3) and then passing that assembly to
gcc results in the following error:
file.s:22: Error: can't encode register '%ah' in an instruction requiring REX
prefix.</pre>
</div>
</p>
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