<html>
<head>
<base href="https://bugs.llvm.org/">
</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 - after fast regalloc: *** Bad machine code: Using an undefined physical register ***"
href="https://bugs.llvm.org/show_bug.cgi?id=33677">33677</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>after fast regalloc: *** Bad machine code: Using an undefined physical register ***
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Register Allocator
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18744" name="attach_18744" title="reduced testcase">attachment 18744</a> <a href="attachment.cgi?id=18744&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
bin/llc -verify-machineinstrs -regalloc=fast
BB#6:
Predecessors according to CFG: BB#3
%vreg9:subreg_hl32<def> = COPY %vreg9:subreg_l32; GR128Bit:%vreg9
%vreg17<def> = COPY %vreg9:subreg_l64; GR64Bit:%vreg17 GR128Bit:%vreg9
J <BB#5>
Successors according to CFG: BB#5(?%)
->
# After Fast Register Allocator
BB#6:
Predecessors according to CFG: BB#3
%R0Q<def> = L128 <fi#0>, 0, %noreg; mem:LD16[FixedStack0](align=8)
%R0L<def> = COPY %R1L, %R0Q<imp-use,kill>
%R2D<def> = COPY %R1D
ST128 %R0Q<kill>, <fi#0>, 0, %noreg; mem:ST16[FixedStack0](align=8)
STG %R2D<kill>, <fi#1>, 0, %noreg; mem:ST8[FixedStack1]
J <BB#5>
Successors according to CFG: BB#5(?%)
*** Bad machine code: Using an undefined physical register ***
- function: main
- basic block: BB#6 (0x432b5cb0)
- instruction: %R2D<def> = COPY
- operand 1: %R1D</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>