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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Assertion "Cannot merge volatile loads""
href="https://bugs.llvm.org/show_bug.cgi?id=42846">42846</a>
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<tr>
<th>Summary</th>
<td>[X86] Assertion "Cannot merge volatile loads"
</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>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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<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>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22324" name="attach_22324" title="stack trace">attachment 22324</a> <a href="attachment.cgi?id=22324&action=edit" title="stack trace">[details]</a></span>
stack trace
$ cat t.cpp
typedef char __attribute__((ext_vector_type(2))) c;
typedef char __attribute__((ext_vector_type(32))) e;
void b(c x);
c j;
c k;
volatile e l, m;
void n() {
c o = __builtin_shufflevector(l, m, 0, 1), p(o);
j = o;
c a (k * p);
b(a);
}
$ clang -c -O2 t.cpp
clang-10:
/home/probinson/projects/llvm-org/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp:7703:
EltsFromConsecutiveLoads(llvm::EVT, llvm::ArrayRef<llvm::SDValue>, const
llvm::SDLoc&, llvm::SelectionDAG&, const llvm::X86Subtarget&,
bool)::<lambda(llvm::EVT, llvm::LoadSDNode*)>: Assertion `!(MMOFlags &
MachineMemOperand::MOVolatile) && "Cannot merge volatile loads."' failed.
(see attachment for stack dump)</pre>
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