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Bugfix for arith rewriter to avoid rewriting loops.

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This commit is contained in:
Christoph M. Wintersteiger 2015-11-03 13:00:10 +00:00
parent 27140c527c
commit bd94b59a92
1 changed files with 6 additions and 1 deletions
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7
src/ast/rewriter/arith_rewriter.cpp
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@ -318,6 +318,7 @@ br_status arith_rewriter::reduce_power(expr * arg1, expr * arg2, op_kind kind, e
}
br_status arith_rewriter::mk_le_ge_eq_core(expr * arg1, expr * arg2, op_kind kind, expr_ref & result) {
expr *orig_arg1 = arg1, *orig_arg2 = arg2;
expr_ref new_arg1(m());
expr_ref new_arg2(m());
if ((is_zero(arg1) && is_reduce_power_target(arg2, kind == EQ)) ||
@ -407,7 +408,11 @@ br_status arith_rewriter::mk_le_ge_eq_core(expr * arg1, expr * arg2, op_kind kin
st = BR_DONE;
}
}
if (st != BR_FAILED) {
if (st == BR_DONE && arg1 == orig_arg1 && arg2 == orig_arg2) {
// Nothing new; return BR_FAILED to avoid rewriting loops.
return BR_FAILED;
}
else if (st != BR_FAILED) {
switch (kind) {
case LE: result = m_util.mk_le(arg1, arg2); return BR_DONE;
case GE: result = m_util.mk_ge(arg1, arg2); return BR_DONE;