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<body><span class="vcard"><a class="email" href="mailto:aemerson@apple.com" title="Amara Emerson <aemerson@apple.com>"> <span class="fn">Amara Emerson</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - llvm::MachineInstr *llvm::MachineRegisterInfo::getVRegDef(unsigned int) const: Assertion `(I.atEnd() || std::next(I) == def_instr_end()) && "getVRegDef assumes a single definition or no definition"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=42129">bug 42129</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>aemerson@apple.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - llvm::MachineInstr *llvm::MachineRegisterInfo::getVRegDef(unsigned int) const: Assertion `(I.atEnd() || std::next(I) == def_instr_end()) && "getVRegDef assumes a single definition or no definition"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=42129#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - llvm::MachineInstr *llvm::MachineRegisterInfo::getVRegDef(unsigned int) const: Assertion `(I.atEnd() || std::next(I) == def_instr_end()) && "getVRegDef assumes a single definition or no definition"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=42129">bug 42129</a>
from <span class="vcard"><a class="email" href="mailto:aemerson@apple.com" title="Amara Emerson <aemerson@apple.com>"> <span class="fn">Amara Emerson</span></a>
</span></b>
<pre>Should be fixed in r362666. We were trying to look through copies but then
called getVRegDef() on a physreg operand. This would normally be benign as it
returns nullptr if so, but with assertions enabled it if there are multiple
defs of the physreg (in this case due to a call instruction that imp-defs w0)
it will crash.</pre>
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