<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SDIV >128bit, DAG->DAG error in LegalizeIntegerTypes"
href="http://llvm.org/bugs/show_bug.cgi?id=17406">17406</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>SDIV >128bit, DAG->DAG error in LegalizeIntegerTypes
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</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>eda-qa@disemia.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>I'm getting the following error when trying to SDIV integers greater
than 128bit (on an AMD64 target).
LegalizeIntegerTypes.cpp:2047: void
llvm::DAGTypeLegalizer::ExpandIntRes_SDIV(llvm::SDNode*, llvm::SDValue&,
llvm::SDValue&): Assertion `LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported
SDIV!"' failed.
Stack dump:
0. Running pass 'X86 DAG->DAG Instruction Selection' on function
'@_entry'
However, not all SDIV on such integers fails, the below works:
@a = global i200 undef
@b = global i64 undef
define void @_entry() {
entry:
store i200 200, i200* @a
%0 = load i200* @a
%1 = load i200* @a
%2 = sdiv i200 %0, %1
%3 = trunc i200 %2 to i64
store i64 %3, i64* @b
%4 = load i64* @b
call void @trace_integer(i64 %4)
ret void
}
Yet with a simple addition (the same SDIV) it fails:
define void @_entry() {
entry:
store i200 200, i200* @a
%0 = load i200* @a
%1 = load i200* @a
%2 = sdiv i200 %0, %1
%3 = trunc i200 %2 to i64
store i64 %3, i64* @b
%4 = load i200* @a
%5 = load i200* @a
%6 = sdiv i200 %4, %5
store i200 %6, i200* @a
ret void
}
This is on the LLVM 3.3 release (it also happens on 3.2, the reason I updated).
As it appears all integer sizes are intended to be supported I assume this is a
defect.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>