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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 --- - thumbv7 instruction selection failure v2i64 = cttz" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23988&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=UTMtiGUoCPBGy2Yf_M_wgFbBFUvudYjA5uJwCn3fR3k&s=kJRNzE4kG7mehcpZ8B7vDD2m9wz7UX-mQsENQL8Vx3M&e=">23988</a>
</td>
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<tr>
<th>Summary</th>
<td>thumbv7 instruction selection failure v2i64 = cttz
</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: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chh@google.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>Created <span class=""><a href="attachment.cgi?id=14532" name="attach_14532" title="preprocessed .cpp file and compilation command">attachment 14532</a> <a href="attachment.cgi?id=14532&action=edit" title="preprocessed .cpp file and compilation command">[details]</a></span>
preprocessed .cpp file and compilation command
Enclosed are script and source to reproduce a crash in NDK clang (*1). It
crashes upstream clang too (revision 239800). Looks like cost model has
changed which invalidates the workaround for the last crash:
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__android-2Dreview.googlesource.com_-23_c_120011_1_lib_Target_ARM_ARMTargetTransformInfo.cpp&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=UTMtiGUoCPBGy2Yf_M_wgFbBFUvudYjA5uJwCn3fR3k&s=siFjw4vs2B2zuW4X99cQDL7IzeIX2mGrefU0ZqHVNNI&e=">https://android-review.googlesource.com/#/c/120011/1/lib/Target/ARM/ARMTargetTransformInfo.cpp</a>
. Investigating
fatal error: error in backend: Cannot select: 0xe035d80: v2i64 = cttz 0xe035264
[ORD=4] [ID=34]
dbg:/usr/local/google/_blaze_wuu/7e341fa8ce94ae7e022303126d53824a/google3/util/bits/bits.h:297:10
0xe035264: v2i64 = bitcast 0xe03649c [ORD=3] [ID=28]
dbg:/usr/local/google/_blaze_wuu/7e341fa8ce94ae7e022303126d53824a/google3/util/geometry/s2cellid.h:438:49
0xe03649c: v2f64,ch = load 0xd66fd20, 0xdfa70ec,
0xe035408<LD16[%lsr.iv2022](align=1)> [ORD=3] [ID=23]
dbg:/usr/local/google/_blaze_wuu/7e341fa8ce94ae7e022303126d53824a/google3/util/geometry/s2cellid.h:438:49
0xdfa70ec: i32,ch = CopyFromReg 0xd66fd20, 0xdfaac80 [ORD=2] [ID=18]
0xdfaac80: i32 = Register %vreg7 [ID=1]
0xe035408: i32 = undef [ID=3]
In function: _ZNK11S2CellUnion16LeafCellsCoveredEv</pre>
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