<html>
<head>
<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - bad cast<> in slp vectorizer"
href="http://llvm.org/bugs/show_bug.cgi?id=19621">19621</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>bad cast<> in 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>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nlewycky@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=12462" name="attach_12462" title="testcase .ll">attachment 12462</a> <a href="attachment.cgi?id=12462&action=edit" title="testcase .ll">[details]</a></span>
testcase .ll
Testcase is 52 lines of IR, attached.
$ opt -slp-vectorizer b.ll
opt: /usr/local/google/home/nlewycky/llvm/include/llvm/Support/Casting.h:237:
typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X =
llvm::Instruction; Y = llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type
= llvm::Instruction*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of
incompatible type!"' failed.
Program received signal SIGABRT, Aborted.
0x00007ffff6ced425 in __GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
64 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 0x00007ffff6ced425 in __GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007ffff6cf0b8b in __GI_abort () at abort.c:91
#2 0x00007ffff6ce60ee in __assert_fail_base (fmt=<optimized out>,
assertion=0x1d07660 "isa<X>(Val) && \"cast<Ty>() argument of incompatible
type!\"",
file=0x1d07618
"/usr/local/google/home/nlewycky/llvm/include/llvm/Support/Casting.h",
line=<optimized out>, function=<optimized out>) at assert.c:94
#3 0x00007ffff6ce6192 in __GI___assert_fail (assertion=0x1d07660 "isa<X>(Val)
&& \"cast<Ty>() argument of incompatible type!\"", file=0x1d07618
"/usr/local/google/home/nlewycky/llvm/include/llvm/Support/Casting.h",
line=237,
function=0x1d07f80 <llvm::cast_retty<llvm::Instruction,
llvm::Value*>::ret_type llvm::cast<llvm::Instruction,
llvm::Value>(llvm::Value*)::__PRETTY_FUNCTION__> "typename llvm::cast_retty<X,
Y*>::ret_type llvm::cast(Y*) [with X = llvm::Instruction; Y = llvm::Value;
typename llvm::cast_retty<X, Y*>::ret_type = llvm::Instruction*]") at
assert.c:103
#4 0x0000000000ab7092 in llvm::cast<llvm::Instruction, llvm::Value>
(Val=0x2ed5480) at
/usr/local/google/home/nlewycky/llvm/include/llvm/Support/Casting.h:237
#5 0x0000000001632d71 in (anonymous
namespace)::SLPVectorizer::tryToVectorizeList (this=0x2ebebb0, VL=..., R=...,
BuildVector=...) at SLPVectorizer.cpp:2204
#6 0x0000000001634ea5 in (anonymous
namespace)::SLPVectorizer::vectorizeChainsInBlock (this=0x2ebebb0,
BB=0x2eb4fb0, R=...) at SLPVectorizer.cpp:2762
#7 0x0000000001631c53 in (anonymous namespace)::SLPVectorizer::runOnFunction
(this=0x2ebebb0, F=...) at SLPVectorizer.cpp:1926
#8 0x0000000001c49958 in llvm::FPPassManager::runOnFunction (this=0x2ec8ed0,
F=...) at LegacyPassManager.cpp:1540
#9 0x0000000001c49ac8 in llvm::FPPassManager::runOnModule (this=0x2ec8ed0,
M=...) at LegacyPassManager.cpp:1560
#10 0x0000000001c49e1c in (anonymous namespace)::MPPassManager::runOnModule
(this=0x2eb3d30, M=...) at LegacyPassManager.cpp:1618
#11 0x0000000001c4a4c6 in llvm::legacy::PassManagerImpl::run (this=0x2eb3a40,
M=...) at LegacyPassManager.cpp:1725
#12 0x0000000001c4a6d1 in llvm::legacy::PassManager::run (this=0x7fffffffe1d0,
M=...) at LegacyPassManager.cpp:1760
#13 0x0000000000adc658 in main (argc=3, argv=0x7fffffffe488) at opt.cpp:631
(gdb) frame 5
#5 0x0000000001632d71 in (anonymous
namespace)::SLPVectorizer::tryToVectorizeList (this=0x2ebebb0, VL=..., R=...,
BuildVector=...) at SLPVectorizer.cpp:2204
2204 Instruction *InsertAfter = cast<Instruction>(VectorizedRoot);
(gdb) p VectorizedRoot
$1 = (llvm::Value *) 0x2ed5480
(gdb) call VectorizedRoot->dump()
<2 x float> undef
(gdb) p VL.size()
$3 = 2
Attempting to call VL[0]->dump() or VL[1]->dump() shows corrupt memory,
consistent with use-after-free.</pre>
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