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<base href="https://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 --- - EarlyCSE Assertion `Val && "isa<> used on a null pointer"'"
href="https://llvm.org/bugs/show_bug.cgi?id=24488">24488</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>EarlyCSE Assertion `Val && "isa<> used on a null pointer"'
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paul_robinson@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14740" name="attach_14740" title="repro IR">attachment 14740</a> <a href="attachment.cgi?id=14740&action=edit" title="repro IR">[details]</a></span>
repro IR
Found by fuzz testing. Fails on 3.7 and trunk.
Bugpoint-reduced IR attached. 'opt' crash log from 3.7 follows.
$ opt bugpoint-reduced-simplified.ll -early-cse
opt:
/home/probinson/projects/llvm-org/llvm3.7/llvm/include/llvm/Support/Casting.h:95:
static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To =
llvm::ConstantInt; From = llvm::Constant]: Assertion `Val && "isa<> used on a
null pointer"' failed.
0 opt 0x00000000015af018
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 56
1 opt 0x00000000015ae159
2 libpthread.so.0 0x00007f79cf845340
3 libc.so.6 0x00007f79cea6dcc9 gsignal + 57
4 libc.so.6 0x00007f79cea710d8 abort + 328
5 libc.so.6 0x00007f79cea66b86
6 libc.so.6 0x00007f79cea66c32
7 opt 0x0000000001173d63
8 opt 0x0000000000f0be3e llvm::findScalarElement(llvm::Value*,
unsigned int) + 142
9 opt 0x0000000000e64c3f
llvm::SimplifyInstruction(llvm::Instruction*, llvm::DataLayout const&,
llvm::TargetLibraryInfo const*, llvm::DominatorTree const*,
llvm::AssumptionCache*) + 383
10 opt 0x00000000014358c9
11 opt 0x000000000143707f
12 opt 0x000000000125aa90
llvm::FPPassManager::runOnFunction(llvm::Function&) + 480
13 opt 0x000000000125ae2b
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
14 opt 0x000000000125b124
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 724
15 opt 0x00000000006437e1 main + 7105
16 libc.so.6 0x00007f79cea58ec5 __libc_start_main + 245
17 opt 0x000000000067df83
Stack dump:
0. Program arguments: /home/probinson/projects/llvm-org/llvm3.7/cobj/bin/opt
-early-cse bz117445.ll -o bz117445-out.ll
1. Running pass 'Function Pass Manager' on module 'bz117445.ll'.
2. Running pass 'Early CSE' on function '@autogen_SD769023506'
Aborted (core dumped)</pre>
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