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fix for tracking the effects of += operations

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This commit is contained in:
Vern Paxson 2021-05-30 17:32:29 -07:00
parent 4ee8bd0082
commit 9ba7e95bad
1 changed files with 11 additions and 1 deletions
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12
src/script_opt/Reduce.cc
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@ -410,7 +410,8 @@ bool Reducer::ExprValid(const ID* id, const Expr* e1, const Expr* e2) const
// must not be any assignments to aggregates of the same
// type(s). This is to deal with possible aliases.
//
// * Same goes to modifications of aggregates via "add" or "delete".
// * Same goes to modifications of aggregates via "add" or "delete"
// or "+=" append.
//
// * No propagation of expressions that are based on aggregates
// across function calls.
@ -944,6 +945,15 @@ TraversalCode CSE_ValidityChecker::PreExpr(const Expr* e)
return TC_ABORTALL;
}
}
case EXPR_APPEND_TO:
// This doesn't directly change any identifiers, but does
// alter an aggregate.
if ( CheckAggrMod(ids, e) )
{
is_valid = false;
return TC_ABORTALL;
}
break;
case EXPR_CALL: