mirror of
https://github.com/Z3Prover/z3
synced 2025-04-23 17:15:31 +00:00
hoist out fixed-bits reasoning into self-contained module
without dependencies on viable entries
This commit is contained in:
Nikolaj Bjorner
parent
658f079efd
commit
b1072d0a1c
8 changed files with 183 additions and 158 deletions
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@ -145,7 +145,7 @@ namespace polysat {
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* Viable
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*/
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void get_bitvector_suffixes(pvar v, offset_slices& out);
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void get_fixed_bits(pvar v, fixed_bits_vector& fixed_bits);
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void get_fixed_bits(pvar v, fixed_bits_vector& fixed_slice);
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void get_subslices(pvar v, offset_slices& out);
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/*
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@ -13,14 +13,95 @@ Author:
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#include "sat/smt/polysat/fixed_bits.h"
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#include "sat/smt/polysat/ule_constraint.h"
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#include "sat/smt/polysat/core.h"
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namespace polysat {
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// reset with fixed bits information for variable v
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void fixed_bits::reset(pvar v) {
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m_fixed_slices.reset();
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m_var = v;
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m_fixed.reset();
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m_fixed.resize(c.size(v), l_undef);
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m_bits.reserve(c.size(v));
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fixed_bits_vector fbs;
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c.get_fixed_bits(v, fbs);
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for (auto const& fb : fbs)
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for (unsigned i = fb.lo; i <= fb.hi; ++i)
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m_fixed[i] = to_lbool(fb.value.get_bit(i - fb.lo));
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}
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// find then next value >= val that agrees with fixed bits, or false if none exists within the maximal value for val.
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// examples
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// fixed bits: 1?0 (least significant bit is last)
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// val: 101
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// next: 110
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// fixed bits ?1?0
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// val 1011
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// next 1100
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// algorith: Let i be the most significant index where fixed bits disagree with val.
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// If m_fixed[i] == l_true; then updating val to mask by fixed bits sufficies.
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// Otherwise, the range above the disagreement has to be incremented.
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// Increment the non-fixed bits by 1
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// The first non-fixed 0 position is set to 1, non-fixed positions below are set to 0.s
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// If there are none, then the value is maximal and we return false.
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bool fixed_bits::next(rational& val) {
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if (m_fixed_slices.empty())
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return true;
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unsigned sz = c.size(m_var);
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for (unsigned i = 0; i < sz; ++i)
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m_bits[i] = val.get_bit(i);
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unsigned i = sz;
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for (; i-- > 0; )
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if (m_fixed[i] != l_undef && m_fixed[i] != to_lbool(m_bits[i]))
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break;
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if (i == 0)
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return true;
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for (unsigned j = 0; j < sz; ++j) {
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if (m_fixed[j] != l_undef)
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m_bits[j] = m_fixed[j] == l_true;
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else if (j < i)
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m_bits[j] = false;
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}
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if (m_fixed[i] == l_false) {
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for (; i < sz; ++i) {
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if (m_fixed[i] != l_undef)
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continue;
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if (m_bits[i])
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m_bits[i] = false;
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else {
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m_bits[i] = true;
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break;
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}
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}
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// overflow
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if (i == sz)
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return false;
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}
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val = 0;
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for (unsigned i = sz; i-- > 0;)
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val = val * 2 + rational(m_bits[i]);
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return true;
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}
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// explain the fixed bits ranges.
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dependency_vector fixed_bits::explain() {
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dependency_vector result;
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for (auto const& slice : m_fixed_slices)
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result.push_back(dependency({ m_var, slice }));
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return result;
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}
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/**
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* 2^k * x = 2^k * b
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* ==> x[N-k-1:0] = b[N-k-1:0]
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*/
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bool get_eq_fixed_lsb(pdd const& p, fixed_bits& out) {
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bool get_eq_fixed_lsb(pdd const& p, fixed_slice& out) {
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SASSERT(!p.is_val());
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unsigned const N = p.power_of_2();
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// Recognize p = 2^k * a * x - 2^k * b
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@ -39,7 +120,7 @@ namespace polysat {
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if (d.parity(N) < k)
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return false;
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rational const b = machine_div2k(d, k);
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out = fixed_bits(N - k - 1, 0, b);
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out = fixed_slice(N - k - 1, 0, b);
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SASSERT_EQ(d, b * rational::power_of_two(k));
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SASSERT_EQ(p, (p.manager().mk_var(p.var()) - out.value) * rational::power_of_two(k));
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return true;
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@ -66,7 +147,7 @@ namespace polysat {
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#endif
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}
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bool get_eq_fixed_bits(pdd const& p, fixed_bits& out) {
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bool get_eq_fixed_slice(pdd const& p, fixed_slice& out) {
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if (get_eq_fixed_lsb(p, out))
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return true;
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return false;
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@ -80,7 +161,7 @@ namespace polysat {
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* ==> x[1:0] = 1
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* -- TODO: Generalize [the obvious solution does not work]
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*/
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bool get_ule_fixed_lsb(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_bits& out) {
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bool get_ule_fixed_lsb(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_slice& out) {
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return false;
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}
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@ -90,7 +171,7 @@ namespace polysat {
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* x <= 2^k - 1 ==> x[N-1:k] = 0
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* x < 2^k ==> x[N-1:k] = 0
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*/
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bool get_ule_fixed_msb(pdd const& p, pdd const& q, bool is_positive, fixed_bits& out) {
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bool get_ule_fixed_msb(pdd const& p, pdd const& q, bool is_positive, fixed_slice& out) {
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SASSERT(!q.is_zero()); // equalities are handled elsewhere
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unsigned const N = p.power_of_2();
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pdd const& lhs = is_positive ? p : q;
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@ -117,14 +198,14 @@ namespace polysat {
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}
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// 2^(N-1) <= 2^(N-1-i) * x
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bool get_ule_fixed_bit(pdd const& p, pdd const& q, bool is_positive, fixed_bits& out) {
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bool get_ule_fixed_bit(pdd const& p, pdd const& q, bool is_positive, fixed_slice& out) {
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return false;
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}
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bool get_ule_fixed_bits(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_bits& out) {
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bool get_ule_fixed_slice(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_slice& out) {
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SASSERT(ule_constraint::is_simplified(lhs, rhs));
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if (rhs.is_zero())
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return is_positive ? get_eq_fixed_bits(lhs, out) : false;
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return is_positive ? get_eq_fixed_slice(lhs, out) : false;
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if (get_ule_fixed_msb(lhs, rhs, is_positive, out))
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return true;
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if (get_ule_fixed_lsb(lhs, rhs, is_positive, out))
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@ -134,10 +215,10 @@ namespace polysat {
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return false;
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}
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bool get_fixed_bits(signed_constraint c, fixed_bits& out) {
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bool get_fixed_slice(signed_constraint c, fixed_slice& out) {
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SASSERT_EQ(c.vars().size(), 1); // this only makes sense for univariate constraints
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if (c.is_ule())
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return get_ule_fixed_bits(c.to_ule().lhs(), c.to_ule().rhs(), c.is_positive(), out);
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return get_ule_fixed_slice(c.to_ule().lhs(), c.to_ule().rhs(), c.is_positive(), out);
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// if (c->is_op())
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// ; // TODO: x & constant = constant ==> bitmask ... but we have trouble recognizing that because we introduce a new variable for '&' before we see the equality.
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return false;
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@ -17,13 +17,33 @@ Author:
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namespace polysat {
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bool get_eq_fixed_lsb(pdd const& p, fixed_bits& out);
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bool get_eq_fixed_bits(pdd const& p, fixed_bits& out);
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class core;
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bool get_ule_fixed_lsb(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_bits& out);
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bool get_ule_fixed_msb(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_bits& out);
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bool get_ule_fixed_bit(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_bits& out);
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bool get_ule_fixed_bits(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_bits& out);
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bool get_fixed_bits(signed_constraint c, fixed_bits& out);
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bool get_eq_fixed_lsb(pdd const& p, fixed_slice& out);
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bool get_eq_fixed_slice(pdd const& p, fixed_slice& out);
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bool get_ule_fixed_lsb(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_slice& out);
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bool get_ule_fixed_msb(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_slice& out);
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bool get_ule_fixed_bit(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_slice& out);
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bool get_ule_fixed_slice(pdd const& lhs, pdd const& rhs, bool is_positive, fixed_slice& out);
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bool get_fixed_slice(signed_constraint c, fixed_slice& out);
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class fixed_bits {
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core& c;
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pvar m_var = null_var;
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vector<fixed_slice> m_fixed_slices;
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svector<lbool> m_fixed;
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bool_vector m_bits;
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public:
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fixed_bits(core& c) : c(c) {}
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// reset with fixed bits information for variable v
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void reset(pvar v);
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// find then next value >= val that agrees with fixed bits, or false if none exists within the maximal value for val.
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bool next(rational& val);
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// explain the fixed bits ranges.
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dependency_vector explain();
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};
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}
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@ -34,24 +34,46 @@ namespace polysat {
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class signed_constraint;
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struct fixed_slice {
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unsigned hi = 0;
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unsigned lo = 0;
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rational value;
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fixed_slice() = default;
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fixed_slice(unsigned hi, unsigned lo, rational value) : hi(hi), lo(lo), value(value) {}
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};
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struct fixed_claim : public fixed_slice {
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pvar v;
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fixed_claim() = default;
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fixed_claim(pvar v, unsigned hi, unsigned lo, rational value) : fixed_slice(hi, lo, value), v(v) {}
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fixed_claim(pvar, fixed_slice const& s) : fixed_slice(s), v(v) {}
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};
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struct offset_slice {
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pvar v;
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unsigned offset;
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};
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class dependency {
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struct axiom_t {};
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std::variant<axiom_t, sat::bool_var, theory_var_pair, offset_claim> m_data;
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std::variant<axiom_t, sat::bool_var, theory_var_pair, offset_claim, fixed_claim> m_data;
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dependency(): m_data(axiom_t()) {}
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public:
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dependency(sat::bool_var v) : m_data(v){}
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dependency(theory_var v1, theory_var v2) : m_data(std::make_pair(v1, v2)) {}
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dependency(theory_var v1, theory_var v2) : m_data(std::make_pair(v1, v2)) {}
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dependency(offset_claim const& c) : m_data(c) {}
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dependency(fixed_claim const& c): m_data(c) {}
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static dependency axiom() { return dependency(); }
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bool is_null() const { return is_bool_var() && *std::get_if<sat::bool_var>(&m_data) == sat::null_bool_var; }
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bool is_axiom() const { return std::holds_alternative<axiom_t>(m_data); }
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bool is_eq() const { return std::holds_alternative<theory_var_pair>(m_data); }
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bool is_bool_var() const { return std::holds_alternative<sat::bool_var>(m_data); }
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bool is_offset_claim() const { return std::holds_alternative<offset_claim>(m_data); }
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bool is_fixed_claim() const { return std::holds_alternative<fixed_claim>(m_data); }
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sat::bool_var bool_var() const { SASSERT(is_bool_var()); return *std::get_if<sat::bool_var>(&m_data); }
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theory_var_pair eq() const { SASSERT(is_eq()); return *std::get_if<theory_var_pair>(&m_data); }
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offset_claim offset() const { return *std::get_if<offset_claim>(&m_data); }
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fixed_claim fixed() const { return *std::get_if<fixed_claim>(&m_data); }
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};
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inline const dependency null_dependency = dependency(sat::null_bool_var);
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@ -72,24 +94,12 @@ namespace polysat {
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}
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struct fixed_bits {
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unsigned hi = 0;
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unsigned lo = 0;
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rational value;
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fixed_bits() = default;
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fixed_bits(unsigned hi, unsigned lo, rational value) : hi(hi), lo(lo), value(value) {}
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};
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struct offset_slice {
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pvar v;
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unsigned offset;
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};
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inline std::ostream& operator<<(std::ostream& out, offset_slice const& js) {
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return out << "v" << js.v << "[" << js.offset << "[ @";
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}
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using fixed_bits_vector = svector<fixed_bits>;
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using fixed_bits_vector = svector<fixed_slice>;
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using dependency_vector = vector<dependency>;
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using constraint_or_dependency = std::variant<signed_constraint, dependency>;
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@ -118,7 +128,7 @@ namespace polysat {
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virtual void get_bitvector_suffixes(pvar v, offset_slices& out) = 0;
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virtual void get_bitvector_sub_slices(pvar v, offset_slices& out) = 0;
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virtual void get_bitvector_super_slices(pvar v, offset_slices& out) = 0;
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virtual void get_fixed_bits(pvar v, fixed_bits_vector& fixed_bits) = 0;
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virtual void get_fixed_bits(pvar v, fixed_bits_vector& fixed_slice) = 0;
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virtual unsigned level(dependency const& d) = 0;
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};
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@ -26,7 +26,7 @@ namespace polysat {
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using dd::val_pp;
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viable::viable(core& c) : c(c), cs(c.cs()), m_forbidden_intervals(c) {}
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viable::viable(core& c) : c(c), cs(c.cs()), m_forbidden_intervals(c), m_fixed_bits(c) {}
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viable::~viable() {
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for (auto* e : m_alloc)
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@ -123,7 +123,7 @@ namespace polysat {
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lbool viable::find_viable(pvar v, rational& lo, rational& hi) {
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m_explain.reset();
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init_fixed_bits(v);
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m_fixed_bits.reset(v);
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init_overlays(v);
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return l_undef;
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@ -132,7 +132,7 @@ namespace polysat {
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rational const& max_value = c.var2pdd(v).max_value();
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lbool r = find_on_layers(v, m_widths, m_overlaps, m_fbi, rational::zero(), max_value, lo);
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lbool r = find_on_layers(v, m_widths, m_overlaps, rational::zero(), max_value, lo);
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if (r != l_true)
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return r;
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@ -141,7 +141,7 @@ namespace polysat {
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return l_true;
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}
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r = find_on_layers(v, m_widths, m_overlaps, m_fbi, lo + 1, max_value, hi);
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r = find_on_layers(v, m_widths, m_overlaps, lo + 1, max_value, hi);
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if (r != l_false)
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return r;
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@ -156,7 +156,6 @@ namespace polysat {
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pvar const v,
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unsigned_vector const& widths,
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offset_slices const& overlaps,
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fixed_bits_info const& fbi,
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rational const& to_cover_lo,
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rational const& to_cover_hi,
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rational& val) {
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@ -169,7 +168,7 @@ namespace polysat {
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while (refinements--) {
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m_explain.shrink(explain_size);
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lbool result = find_on_layer(v, widths.size() - 1, widths, overlaps, fbi, to_cover_lo, to_cover_hi, val, refine_todo);
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lbool result = find_on_layer(v, widths.size() - 1, widths, overlaps, to_cover_lo, to_cover_hi, val, refine_todo);
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// store bit-intervals we have used
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for (entry* e : refine_todo)
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@ -183,6 +182,7 @@ namespace polysat {
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// start refinement on smallest variable
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// however, we probably should rotate to avoid getting stuck in refinement loop on a 'bad' constraint
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bool refined = false;
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#if 0
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for (unsigned i = overlaps.size(); i-- > 0; ) {
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pvar x = overlaps[i].v;
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rational const& mod_value = c.var2pdd(x).two_to_N();
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@ -192,6 +192,7 @@ namespace polysat {
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break;
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}
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}
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#endif
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if (!refined)
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return l_true;
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@ -210,7 +211,6 @@ namespace polysat {
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unsigned const w_idx,
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unsigned_vector const& widths,
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offset_slices const& overlaps,
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fixed_bits_info const& fbi,
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rational const& to_cover_lo,
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rational const& to_cover_hi,
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rational& val,
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@ -283,6 +283,7 @@ namespace polysat {
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}
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}
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#if 0
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// when we cannot make progress by existing intervals any more, try interval from fixed bits
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if (!e) {
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e = refine_bits<true>(v, val, w, fbi);
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@ -291,6 +292,7 @@ namespace polysat {
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display_one(std::cerr << "found entry by bits: ", 0, e) << "\n";
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}
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}
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#endif
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// no more progress on current layer
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if (!e)
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@ -346,6 +348,7 @@ namespace polysat {
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if (distance(val, n, mod_value) < distance(val, next_val, mod_value))
|
||||
next_val = n;
|
||||
}
|
||||
#if 0
|
||||
if (entry* e = refine_bits<false>(v, next_val, w, fbi)) {
|
||||
refine_todo.push_back(e);
|
||||
rational const& n = e->interval.lo_val();
|
||||
|
|
@ -353,6 +356,7 @@ namespace polysat {
|
|||
next_val = n;
|
||||
}
|
||||
SASSERT(!refine_bits<true>(v, val, w, fbi));
|
||||
#endif
|
||||
SASSERT(val != next_val);
|
||||
|
||||
unsigned const lower_w = widths[w_idx - 1];
|
||||
|
|
@ -366,7 +370,7 @@ namespace polysat {
|
|||
lower_cover_lo = 0;
|
||||
lower_cover_hi = lower_mod_value;
|
||||
rational a;
|
||||
lbool result = find_on_layer(v, w_idx - 1, widths, overlaps, fbi, lower_cover_lo, lower_cover_hi, a, refine_todo);
|
||||
lbool result = find_on_layer(v, w_idx - 1, widths, overlaps, lower_cover_lo, lower_cover_hi, a, refine_todo);
|
||||
VERIFY(result != l_undef);
|
||||
if (result == l_false) {
|
||||
SASSERT(c.inconsistent());
|
||||
|
|
@ -388,7 +392,7 @@ namespace polysat {
|
|||
lower_cover_hi = mod(next_val, lower_mod_value);
|
||||
|
||||
rational a;
|
||||
lbool result = find_on_layer(v, w_idx - 1, widths, overlaps, fbi, lower_cover_lo, lower_cover_hi, a, refine_todo);
|
||||
lbool result = find_on_layer(v, w_idx - 1, widths, overlaps, lower_cover_lo, lower_cover_hi, a, refine_todo);
|
||||
if (result == l_false) {
|
||||
SASSERT(c.inconsistent());
|
||||
return l_false; // conflict
|
||||
|
|
@ -431,38 +435,6 @@ namespace polysat {
|
|||
return true;
|
||||
}
|
||||
|
||||
// returns true iff no conflict was encountered
|
||||
bool viable::collect_bit_information(pvar v, bool add_conflict, fixed_bits_info& out_fbi) {
|
||||
|
||||
pdd p = c.var(v);
|
||||
unsigned const v_sz = c.size(v);
|
||||
out_fbi.reset(v_sz);
|
||||
auto& [fixed, just_src, just_side_cond, just_slice] = out_fbi;
|
||||
|
||||
fixed_bits_vector fbs;
|
||||
c.get_fixed_bits(v, fbs);
|
||||
|
||||
for (auto const& fb : fbs) {
|
||||
LOG("slicing fixed bits: v" << v << "[" << fb.hi << ":" << fb.lo << "] = " << fb.value);
|
||||
for (unsigned i = fb.lo; i <= fb.hi; ++i) {
|
||||
SASSERT(out_fbi.just_src[i].empty()); // since we don't get overlapping ranges from collect_fixed.
|
||||
SASSERT(out_fbi.just_side_cond[i].empty());
|
||||
SASSERT(out_fbi.just_slicing[i].empty());
|
||||
out_fbi.fixed[i] = to_lbool(fb.value.get_bit(i - fb.lo));
|
||||
out_fbi.just_slicing[i].push_back(fb);
|
||||
}
|
||||
}
|
||||
|
||||
entry* e1 = m_equal_lin[v];
|
||||
entry* e2 = m_units[v].get_entries(c.size(v)); // TODO: take other widths into account (will be done automatically by tracking fixed bits in the slicing egraph)
|
||||
entry* first = e1;
|
||||
if (!e1 && !e2)
|
||||
return true;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Explain why the current variable is not viable or signleton.
|
||||
*/
|
||||
|
|
@ -474,7 +446,7 @@ namespace polysat {
|
|||
result.push_back(d);
|
||||
result.append(c.explain_eval(sc));
|
||||
}
|
||||
// TODO: explaination for fixed bits
|
||||
result.append(m_fixed_bits.explain());
|
||||
return result;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -23,6 +23,8 @@ Author:
|
|||
|
||||
#include "sat/smt/polysat/types.h"
|
||||
#include "sat/smt/polysat/forbidden_intervals.h"
|
||||
#include "sat/smt/polysat/fixed_bits.h"
|
||||
|
||||
|
||||
namespace polysat {
|
||||
|
||||
|
|
@ -103,56 +105,6 @@ namespace polysat {
|
|||
entry* get_entries(unsigned bit_width) const { layer const* l = get_layer(bit_width); return l ? l->entries : nullptr; }
|
||||
};
|
||||
|
||||
struct fixed_bits_info {
|
||||
svector<lbool> fixed;
|
||||
vector<vector<signed_constraint>> just_src;
|
||||
vector<vector<signed_constraint>> just_side_cond;
|
||||
vector<fixed_bits_vector> just_slicing;
|
||||
|
||||
bool is_empty() const {
|
||||
SASSERT_EQ(fixed.empty(), just_src.empty());
|
||||
SASSERT_EQ(fixed.empty(), just_side_cond.empty());
|
||||
return fixed.empty();
|
||||
}
|
||||
|
||||
bool is_empty_at(unsigned i) const {
|
||||
return fixed[i] == l_undef && just_src[i].empty() && just_side_cond[i].empty();
|
||||
}
|
||||
|
||||
void reset(unsigned num_bits) {
|
||||
fixed.reset();
|
||||
fixed.resize(num_bits, l_undef);
|
||||
just_src.reset();
|
||||
just_src.resize(num_bits);
|
||||
just_side_cond.reset();
|
||||
just_side_cond.resize(num_bits);
|
||||
just_slicing.reset();
|
||||
just_slicing.resize(num_bits);
|
||||
}
|
||||
|
||||
void reset_just(unsigned i) {
|
||||
just_src[i].reset();
|
||||
just_side_cond[i].reset();
|
||||
just_slicing[i].reset();
|
||||
}
|
||||
|
||||
void set_just(unsigned i, entry* e) {
|
||||
reset_just(i);
|
||||
push_just(i, e);
|
||||
}
|
||||
|
||||
void push_just(unsigned i, entry* e) {
|
||||
just_src[i].append(e->src);
|
||||
just_side_cond[i].append(e->side_cond);
|
||||
}
|
||||
|
||||
void push_from_bit(unsigned i, unsigned src) {
|
||||
just_src[i].append(just_src[src]);
|
||||
just_side_cond[i].append(just_side_cond[src]);
|
||||
just_slicing[i].append(just_slicing[src]);
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
ptr_vector<entry> m_alloc;
|
||||
vector<layers> m_units; // set of viable values based on unit multipliers, layered by bit-width in descending order
|
||||
|
|
@ -187,7 +139,6 @@ namespace polysat {
|
|||
pvar v,
|
||||
unsigned_vector const& widths,
|
||||
offset_slices const& overlaps,
|
||||
fixed_bits_info const& fbi,
|
||||
rational const& to_cover_lo,
|
||||
rational const& to_cover_hi,
|
||||
rational& out_val);
|
||||
|
|
@ -197,39 +148,14 @@ namespace polysat {
|
|||
unsigned w_idx,
|
||||
unsigned_vector const& widths,
|
||||
offset_slices const& overlaps,
|
||||
fixed_bits_info const& fbi,
|
||||
rational const& to_cover_lo,
|
||||
rational const& to_cover_hi,
|
||||
rational& out_val,
|
||||
ptr_vector<entry>& refine_todo);
|
||||
|
||||
|
||||
template <bool FORWARD>
|
||||
bool refine_viable(pvar v, rational const& val, fixed_bits_info const& fbi) {
|
||||
throw default_exception("refine nyi");
|
||||
}
|
||||
|
||||
bool refine_viable(pvar v, rational const& val) {
|
||||
throw default_exception("refine nyi");
|
||||
}
|
||||
|
||||
template <bool FORWARD>
|
||||
bool refine_bits(pvar v, rational const& val, fixed_bits_info const& fbi) {
|
||||
throw default_exception("refine nyi");
|
||||
}
|
||||
|
||||
template <bool FORWARD>
|
||||
entry* refine_bits(pvar v, rational const& val, unsigned num_bits, fixed_bits_info const& fbi) {
|
||||
throw default_exception("refine nyi");
|
||||
}
|
||||
|
||||
bool refine_equal_lin(pvar v, rational const& val) {
|
||||
throw default_exception("refine nyi");
|
||||
}
|
||||
|
||||
bool refine_disequal_lin(pvar v, rational const& val) {
|
||||
throw default_exception("refine nyi");
|
||||
}
|
||||
|
||||
void set_conflict_by_interval(pvar v, unsigned w, ptr_vector<entry>& intervals, unsigned first_interval);
|
||||
bool set_conflict_by_interval_rec(pvar v, unsigned w, entry** intervals, unsigned num_intervals, bool& create_lemma, uint_set& vars_to_explain);
|
||||
|
|
@ -238,10 +164,7 @@ namespace polysat {
|
|||
throw default_exception("fine_value nyi");
|
||||
}
|
||||
|
||||
bool collect_bit_information(pvar v, bool add_conflict, fixed_bits_info& out_fbi);
|
||||
|
||||
|
||||
fixed_bits_info m_fbi;
|
||||
fixed_bits m_fixed_bits;
|
||||
void init_fixed_bits(pvar v);
|
||||
|
||||
unsigned_vector m_widths;
|
||||
|
|
@ -259,7 +182,7 @@ namespace polysat {
|
|||
find_t find_viable(pvar v, rational& out_val);
|
||||
|
||||
/*
|
||||
* Explain why the current variable is not viable or signleton.
|
||||
* Explain the current variable is not viable or signleton.
|
||||
*/
|
||||
dependency_vector explain();
|
||||
|
||||
|
|
|
|||
|
|
@ -107,7 +107,7 @@ namespace polysat {
|
|||
unsigned lo = offset, hi = bv.get_bv_size(n->get_expr());
|
||||
rational value;
|
||||
VERIFY(bv.is_numeral(n->get_expr(), value));
|
||||
out.push_back({ fixed_bits(lo, hi, value) });
|
||||
out.push_back({ fixed_slice(lo, hi, value) });
|
||||
return false;
|
||||
};
|
||||
theory_var v = m_pddvar2var[pv];
|
||||
|
|
|
|||
|
|
@ -223,6 +223,18 @@ namespace polysat {
|
|||
level = std::max(level, s().lvl(lit));
|
||||
return level;
|
||||
}
|
||||
else if (d.is_fixed_claim()) {
|
||||
auto const& f = d.fixed();
|
||||
sat::literal_vector lits;
|
||||
std::function<void(euf::enode*, euf::enode*)> consume = [&](auto* a, auto* b) {
|
||||
ctx.get_eq_antecedents(a, b, lits);
|
||||
};
|
||||
explain_fixed(f.v, f.lo, f.hi, f.value, consume);
|
||||
unsigned level = 0;
|
||||
for (auto lit : lits)
|
||||
level = std::max(level, s().lvl(lit));
|
||||
return level;
|
||||
}
|
||||
else {
|
||||
SASSERT(d.is_axiom());
|
||||
return 0;
|
||||
|
|
@ -281,6 +293,13 @@ namespace polysat {
|
|||
};
|
||||
explain_slice(v, w, offset, consume);
|
||||
}
|
||||
else if (d.is_fixed_claim()) {
|
||||
auto const& f = d.fixed();
|
||||
std::function<void(euf::enode*, euf::enode*)> consume = [&](auto* a, auto* b) {
|
||||
lits.push_back(~eq_internalize(a, b));
|
||||
};
|
||||
explain_fixed(f.v, f.lo, f.hi, f.value, consume);
|
||||
}
|
||||
else {
|
||||
SASSERT(d.is_axiom());
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue