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better cofactoring

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This commit is contained in:
Nikolaj Bjorner 2026-06-24 15:55:30 -07:00
parent d77fe0b0cd
commit 9a5089397d
7 changed files with 120 additions and 46 deletions
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29
src/ast/rewriter/bool_rewriter.cpp
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@ -19,6 +19,7 @@ Notes:
#include "ast/rewriter/bool_rewriter.h"
#include "params/bool_rewriter_params.hpp"
#include "ast/rewriter/rewriter_def.h"
#include "ast/rewriter/expr_safe_replace.h"
#include "ast/ast_lt.h"
#include "ast/for_each_expr.h"
#include <algorithm>
@ -1185,4 +1186,30 @@ void bool_rewriter::mk_ge2(expr* a, expr* b, expr* c, expr_ref& r) {
}
template class rewriter_tpl<bool_rewriter_cfg>;
bool bool_rewriter::decompose_ite(expr *r, expr_ref &c, expr_ref &th, expr_ref &el) {
expr *cond = nullptr, *r1 = nullptr, *r2 = nullptr;
if (m().is_ite(r, cond, r1, r2)) {
c = cond;
th = r1;
el = r2;
return true;
}
for (expr *e : subterms::ground(expr_ref(r, m()))) {
if (m().is_ite(e, cond, r1, r2)) {
expr_safe_replace rep1(m());
expr_safe_replace rep2(m());
rep1.insert(e, r1);
rep2.insert(e, r2);
c = cond;
th = r;
el = r;
rep1(th);
rep2(el);
return true;
}
}
return false;
}
template class rewriter_tpl<bool_rewriter_cfg>;