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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - patchpoint: ran out of registers during register allocation"
href="https://llvm.org/bugs/show_bug.cgi?id=23306">23306</a>
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<th>Summary</th>
<td>patchpoint: ran out of registers during register allocation
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<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>Register Allocator
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>undingen@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>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14235" name="attach_14235" title="Example using a lot of GVs">attachment 14235</a> <a href="attachment.cgi?id=14235&action=edit" title="Example using a lot of GVs">[details]</a></span>
Example using a lot of GVs
When I create a patchpoint with many live values I get a "ran out of registers
during register allocation" error. I tested it with 3.6 and trunk.
Changing the regalloc does not help.
@c0 = external global i64
@c1 = external global i64
...
%ret = call i64 (i64, i32, i8*, i32, ...)*
@llvm.experimental.patchpoint.i64(i64 0, i32 512, i8* inttoptr (i64 -1 to i8*),
i32 0, i64* @c0, i64* @c1, i64* @c2, i64* @c3, i64* @c4, i64* @c5, i64* @c6,
i64* @c7, i64* @c8, i64* @c9, i64* @c10, i64* @c11, i64* @c12, i64* @c13, i64*
@c14, i64* @c15)
ret i64 %ret
llc output: LLVM ERROR: ran out of registers during register allocation</pre>
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