[LLVMbugs] [Bug 16777] New: Clang crash caused by SLP vectorizer

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16777

            Bug ID: 16777
           Summary: Clang crash caused by SLP vectorizer
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: nrotem at apple.com
          Reporter: samsonov at google.com
                CC: dan433584 at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10974
  --> http://llvm.org/bugs/attachment.cgi?id=10974&action=edit
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'

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20130802/1b2d3fae/attachment.html>