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Apply ZIPT improvements: fix loop nullable, drop bounds check, symmetric star merging

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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copilot-swe-agent[bot] 2026-03-03 05:39:33 +00:00
parent 593e22ba4e
commit a0b359212e
2 changed files with 19 additions and 5 deletions
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7
src/ast/euf/euf_seq_plugin.cpp
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@ -212,11 +212,16 @@ namespace euf {
if (same_star_body(a, b))
push_merge(n, a);
// Rule 1 extended: concat(v*, concat(v*, c)) = concat(v*, c)
// Rule 1 extended (right): concat(v*, concat(v*, c)) = concat(v*, c)
enode* b1, *b2;
if (is_concat(b, b1, b2) && same_star_body(a, b1))
push_merge(n, b);
// Rule 1 extended (left): concat(concat(c, v*), v*) = concat(c, v*)
enode* a1, *a2;
if (is_concat(a, a1, a2) && same_star_body(a2, b))
push_merge(n, a);
// Rule 2: Nullable absorption by .*
// concat(.*, v) = .* when v is nullable
if (is_full_seq(a) && is_nullable(b))