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add bv-size reduce #6137

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- add option smt.bv.reduce_size.
  - it allows to apply incremental pre-processing of bit-vectors by identifying ranges that are known to be constant.
    This rewrite is beneficial, for instance, when bit-vectors are constrained to have many high-level bits set to 0.
This commit is contained in:
Nikolaj Bjorner 2022-08-16 16:35:14 -07:00
parent 45a4b810de
commit 48b13291d1
8 changed files with 78 additions and 0 deletions
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14
src/ast/rewriter/expr_safe_replace.cpp
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@ -190,3 +190,17 @@ void expr_safe_replace::apply_substitution(expr* s, expr* def, expr_ref& t) {
(*this)(t, t);
reset();
}
void expr_safe_replace::push_scope() {
m_limit.push_back(m_src.size());
}
void expr_safe_replace::pop_scope(unsigned n) {
unsigned old_sz = m_limit[m_limit.size() - n];
if (old_sz != m_src.size()) {
m_cache.clear();
m_src.shrink(old_sz);
m_dst.shrink(old_sz);
}
m_limit.shrink(m_limit.size() - n);
}

5
src/ast/rewriter/expr_safe_replace.h
View file

@ -28,6 +28,7 @@ class expr_safe_replace {
ast_manager& m;
expr_ref_vector m_src;
expr_ref_vector m_dst;
unsigned_vector m_limit = 0;
ptr_vector<expr> m_todo, m_args;
expr_ref_vector m_refs;
std::unordered_map<expr*,expr*> m_cache;
@ -48,5 +49,9 @@ public:
void reset();
bool empty() const { return m_src.empty(); }
void push_scope();
void pop_scope(unsigned n);
};