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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [mc] Zero divider is not handled for modulo"
href="https://bugs.llvm.org/show_bug.cgi?id=35650">35650</a>
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<th>Summary</th>
<td>[mc] Zero divider is not handled for modulo
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>MC
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>i.am.perminov@gmail.com
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<th>CC</th>
<td>artem.tamazov@amd.com, dpreobrazhensky@luxoft.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>Zero RHS is handled for DIV, but not for MOD operation which leads to crash if
divider is zero:
bool MCExpr::evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
...
case MCBinaryExpr::Div:
// Handle division by zero. gas just emits a warning and keeps going,
// we try to be stricter.
// FIXME: Currently the caller of this function has no way to understand
// we're bailing out because of 'division by zero'. Therefore, it will
// emit a 'expected relocatable expression' error. It would be nice to
// change this code to emit a better diagnostic.
if (RHS == 0)
return false;
Result = LHS / RHS;
break;
...
case MCBinaryExpr::Mod: Result = LHS % RHS; break;</pre>
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