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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SystemZISelLowering.cpp: Assertion `Mask != 0 && "ANDs with zero should have been removed by now"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=33565">33565</a>
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<th>Summary</th>
<td>SystemZISelLowering.cpp: Assertion `Mask != 0 && "ANDs with zero should have been removed by now"' failed.
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: SystemZ
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18695" name="attach_18695" title="reduced testcase">attachment 18695</a> <a href="attachment.cgi?id=18695&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
(Csmith)
bin/llc -mtriple=s390x-linux-gnu -mcpu=z13 tc_ANDZero.ll
getTestUnderMaskCond() is called with a Mask==0. Mask is 0 because CmpVal==9294
and ShiftVal==63.
Not sure what's going wrong here, but it seems that this is a case that perhaps
should never have been passed to getTestUnderMaskCond(). The comment there says
// Check whether an AND with Mask is suitable for a TEST UNDER MASK...
, but the setcc looks like:
SelectionDAG has 17 nodes:
...
t34: i64,ch = load<Volatile LD8...
t52: i64 = srl t34, Constant:i32<63>
t48: i32 = setcc t52, Constant:i64<9293>, setgt:ch</pre>
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