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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang crash caused by SLP vectorizer"
href="http://llvm.org/bugs/show_bug.cgi?id=16777">16777</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang crash caused by SLP vectorizer
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>nrotem@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>samsonov@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dan433584@gmail.com, 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=10974" name="attach_10974" title="Reproducer">attachment 10974</a> <a href="attachment.cgi?id=10974&action=edit" title="Reproducer">[details]</a></span>
Reproducer
The following line crashes for me:
(minimized reproducer in the attachment)
If I remove "-vectorize-slp", clang produces expected results.
$ bin/clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -target-cpu x86-64
-O2 -std=c99 -x c graphics-439a32.c -vectorize-slp -o graphics-439a32.o
Instruction does not dominate all uses!
%17 = extractelement <2 x double> %4, i32 0
%g.0 = phi double [ 0.000000e+00, %if.then6 ], [ %17, %if.then ], [ %17,
%entry ]
Broken module found, compilation aborted!
0 clang 0x0000000001343235 _ZN4llvm3sys15PrintStackTraceEP8_IO_FILE
+ 37
1 clang 0x0000000001343653
2 libpthread.so.0 0x00007ff356b53cb0
3 libc.so.6 0x00007ff355d92425 gsignal + 53
4 libc.so.6 0x00007ff355d95b8b abort + 379
5 clang 0x0000000001279473
6 clang 0x000000000127912c
7 clang 0x000000000125feba
_ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE + 346
8 clang 0x000000000126014b
_ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE + 43
9 clang 0x00000000012604d8
_ZN4llvm13MPPassManager11runOnModuleERNS_6ModuleE + 440
10 clang 0x0000000001260bcf
_ZN4llvm15PassManagerImpl3runERNS_6ModuleE + 575
11 clang 0x0000000001260d6a _ZN4llvm11PassManager3runERNS_6ModuleE +
10
12 clang 0x0000000001362b17
_ZN5clang17EmitBackendOutputERNS_17DiagnosticsEngineERKNS_14CodeGenOptionsERKNS_13TargetOptionsERKNS_11LangOptionsEPN4llvm6ModuleENS_13BackendActionEPNSB_11raw_ostreamE
+ 5959
13 clang 0x000000000135ff96
14 clang 0x000000000160af33 _ZN5clang8ParseASTERNS_4SemaEbb + 531
15 clang 0x000000000135f3b2 _ZN5clang13CodeGenAction13ExecuteActionEv
+ 514
16 clang 0x0000000001554ee0 _ZN5clang14FrontendAction7ExecuteEv + 112
17 clang 0x0000000001533c0d
_ZN5clang16CompilerInstance13ExecuteActionERNS_14FrontendActionE + 925
18 clang 0x0000000001346d76
_ZN5clang25ExecuteCompilerInvocationEPNS_16CompilerInstanceE + 2934
19 clang 0x00000000006552af _Z8cc1_mainPPKcS1_S0_Pv + 703
20 clang 0x0000000000653cf6 main + 8406
21 libc.so.6 0x00007ff355d7d76d __libc_start_main + 237
22 clang 0x0000000000651b19
Stack dump:
0. Program arguments: bin/clang -cc1 -triple x86_64-unknown-linux-gnu
-emit-obj -target-cpu x86-64 -O2 -std=c99 -x c graphics-439a32.c -vectorize-slp
-o graphics-439a32.o
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'graphics-439a32.c'.
4. Running pass 'Module Verifier' on function '@Rf_GReset'</pre>
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