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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 --- - CodeGen crash with "Physical register dependency violated?""
href="https://llvm.org/bugs/show_bug.cgi?id=23405">23405</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>CodeGen crash with "Physical register dependency violated?"
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chfast@gmail.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>The CodeGen crashes during instruction scheduling / backtracking. It is quite
similar to <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - CodeGen crash with "Queue is empty!" on lshr i256 instruction"
href="show_bug.cgi?id=22304">https://llvm.org/bugs/show_bug.cgi?id=22304</a> (already fixed).
Test case:
define i64 @test(i64 %a, i256 %b, i1 %c) {
%u = zext i64 %a to i256
%s = add i256 %u, 1
%o = trunc i256 %s to i1
%j = add i256 %s, 1
%i = icmp ule i64 %a, 1
%f = select i1 %o, i256 undef, i256 %j
%d = select i1 %i, i256 %f, i256 1
%e = add i256 %b, 1
%n = select i1 %c, i256 %e, i256 %b
%m = trunc i256 %n to i64
%h = add i64 %m, 1
%r = zext i64 %h to i256
%v = lshr i256 %d, %r
%t = trunc i256 %v to i1
%q = shl i256 1, %r
%p = and i256 %d, %q
%w = icmp ule i256 %n, 1
%y = select i1 %t, i256 undef, i256 %p
%x = select i1 %w, i256 %y, i256 %d
%z = trunc i256 %x to i64
ret i64 %z
}</pre>
</div>
</p>
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