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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Mips Backend generates wrong code for vaarg"
href="http://llvm.org/bugs/show_bug.cgi?id=15389">15389</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Mips Backend generates wrong code for vaarg
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>3.2
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>n.stavropoulos@think-silicon.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10105" name="attach_10105" title="assembly code for mipsel. bug between lines 253 -259">attachment 10105</a> <a href="attachment.cgi?id=10105&action=edit" title="assembly code for mipsel. bug between lines 253 -259">[details]</a></span>
assembly code for mipsel. bug between lines 253 -259
typedef integer I;
void test1(I p0, I p1, I p2, I p3, I p4, I p5, I p6, I p7, I p8, ...)
{
va_list select;
va_start (select, p8);
report( va_arg(select,I) );
report( va_arg(select,I) );
report( va_arg(select,I) );
va_end (select);
}
typedef long long L;
void test2(auto L p0, auto L p1, auto L p2, auto L p4, ...)
{
va_list select;
va_start (select, p4);
report( va_arg(select,L) );
report( va_arg(select,I) );
report( va_arg(select,L) );
va_end (select);
}
int main(void)
{
test1(0L, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);
test2(1, 2, 3, 4, 5LL, 6, 7LL);
return 0;
}
report is just print function
in this code mipsel backend fails to generate correct code
attached mipsel.s code generated with command
"llc -O1 -march=mipsel -relocation-model=static -asm-verbose
-mattr=+condmov,-muldivadd,+single-float,-fp64,+o32,-bitcount"
this bug is generated for every -O argument
in test2 function,we have to report a long long value then an integer and
finally a long long.
for some reason backend does addiu $3, $2, 4 and the last argument is not read
correctly.
addiu $sp, $sp, -24
sw $ra, 20($sp) # 4-byte Folded Spill
addiu $2, $sp, 56
sw $2, 16($sp)
addiu $2, $2, 8
sw $2, 16($sp)
lw $5, 60($sp)
lw $4, 56($sp)
jal _Z6reportx
nop
lw $2, 16($sp)
###possible bug
addiu $3, $2, 4
###possible bug
sw $3, 16($sp)
lw $4, 0($2)
jal _Z6reporti
nop
lw $2, 16($sp)
addiu $3, $2, 8
sw $3, 16($sp)
lw $5, 4($2)
lw $4, 0($2)</pre>
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