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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -O0 crash: assertion "Cannot BITCAST between types of different sizes!""
href="https://bugs.llvm.org/show_bug.cgi?id=34947">34947</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>-O0 crash: assertion "Cannot BITCAST between types of different sizes!"
</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>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>babokin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>clang trunk, rev315788, x86_64.
<span class="quote">> cat f.cpp</span >
typedef unsigned a __attribute__((ext_vector_type(9)));
a b = 2149580799 % 262143 * (0 % b);
<span class="quote">> clang++ -c f.cpp -w</span >
clang-6.0:
/home/dybaboki/llvm/llvm-trunk-20171013/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:3822:
llvm::SDValue llvm::SelectionDAG::getNode(unsigned int, const llvm::SDLoc &,
llvm::EVT, llvm::SDValue, const llvm::SDNodeFlags): Assertion
`VT.getSizeInBits() == Operand.get
ValueSizeInBits() && "Cannot BITCAST between types of different sizes!"'
failed.
#0 0x000000000137e1ef llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x137e1ef)
#1 0x000000000137e4f6 SignalHandler(int)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x137e4f6)
#2 0x00007f92b5e18370 __restore_rt (/lib64/libpthread.so.0+0xf370)
#3 0x00007f92b49941d7 __GI_raise (/lib64/libc.so.6+0x351d7)
#4 0x00007f92b49958c8 __GI_abort (/lib64/libc.so.6+0x368c8)
#5 0x00007f92b498d146 __assert_fail_base (/lib64/libc.so.6+0x2e146)
#6 0x00007f92b498d1f2 (/lib64/libc.so.6+0x2e1f2)
#7 0x0000000001ad09c3 llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc
const&, llvm::EVT, llvm::SDValue, llvm::SDNodeFlags)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1ad09c3)
#8 0x00000000008d3e37 llvm::X86TargetLowering::PerformDAGCombine(llvm::SDNode*,
llvm::TargetLowering::DAGCombinerInfo&) const
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x8d3e37)
#9 0x00000000019d6074 (anonymous
namespace)::DAGCombiner::combine(llvm::SDNode*)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x19d6074)
#10 0x00000000019d4ccf llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults*, llvm::CodeGenOpt::Level)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x19d4ccf)
#11 0x0000000001b0d66a llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1b0d66a)
#12 0x0000000001b0bc0c
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1b0bc0c)
#13 0x0000000001b084b4
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1b084b4)
#14 0x000000000083ce81 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x83ce81)
#15 0x0000000000bf4938
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0xbf4938)
#16 0x0000000000f0d9af llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0xf0d9af)
#17 0x0000000000f0dc73 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0xf0dc73)
<...></pre>
</div>
</p>
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