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simplify: rewrite bitxnor on booleans to equal #8594

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Mar 11, 2025
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simplify: rewrite bitxnor on booleans to equal #8594

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6 changes: 4 additions & 2 deletions src/util/simplify_expr_int.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -696,6 +696,8 @@
new_expr.id(ID_or);
else if(expr.id()==ID_bitxor)
new_expr.id(ID_xor);
else if(expr.id() == ID_bitxnor)
new_expr.id(ID_equal);

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src/util/simplify_expr_int.cpp#L699-L700 

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Below we call simplify_boolean on the resulting expression, which won't know how to simplify equality. We'll have to change the call below to simplify_node.

else
UNREACHABLE;

Expand All @@ -709,8 +711,8 @@
*it=true_exprt();
}

new_expr.type()=bool_typet();
new_expr = simplify_boolean(new_expr);
new_expr.type() = bool_typet{};
new_expr = simplify_node(new_expr);

return changed(simplify_typecast(typecast_exprt(new_expr, expr.type())));
}
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