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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2024-03-05 02:53:47 -08:00
parent 531bda39ac
commit d6f522e205
5 changed files with 83 additions and 27 deletions
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29
src/ast/sls/sls_valuation.cpp
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@ -307,18 +307,21 @@ namespace bv {
void sls_valuation::round_down(bvect& dst, std::function<bool(bvect const&)> const& is_feasible) {
for (unsigned i = bw; !is_feasible(dst) && i-- > 0; )
if (!fixed.get(i) && dst.get(i))
dst.set(i, false);
dst.set(i, false);
repair_sign_bits(dst);
}
void sls_valuation::round_up(bvect& dst, std::function<bool(bvect const&)> const& is_feasible) {
for (unsigned i = 0; !is_feasible(dst) && i < bw; ++i)
if (!fixed.get(i) && !dst.get(i))
dst.set(i, true);
repair_sign_bits(dst);
}
void sls_valuation::set_random_above(bvect& dst, random_gen& r) {
for (unsigned i = 0; i < nw; ++i)
dst[i] = dst[i] | (random_bits(r) & ~fixed[i]);
repair_sign_bits(dst);
}
void sls_valuation::set_random_below(bvect& dst, random_gen& r) {
@ -335,12 +338,14 @@ namespace bv {
for (unsigned i = 0; i < idx; ++i)
if (!fixed.get(i))
dst.set(i, r() % 2 == 0);
repair_sign_bits(dst);
}
bool sls_valuation::set_repair(bool try_down, bvect& dst) {
for (unsigned i = 0; i < nw; ++i)
dst[i] = (~fixed[i] & dst[i]) | (fixed[i] & m_bits[i]);
repair_sign_bits(dst);
if (in_range(dst)) {
set(eval, dst);
return true;
@ -363,6 +368,7 @@ namespace bv {
if (!fixed.get(i) && dst.get(i))
dst.set(i, false);
}
repair_sign_bits(dst);
if (in_range(dst)) {
set(eval, dst);
repaired = true;
@ -378,6 +384,7 @@ namespace bv {
for (unsigned i = 0; i < nw; ++i)
out[i] = fixed[i] & m_bits[i];
}
repair_sign_bits(out);
SASSERT(!has_overflow(out));
}
@ -390,6 +397,7 @@ namespace bv {
for (unsigned i = 0; i < nw; ++i)
out[i] = ~fixed[i] | m_bits[i];
}
repair_sign_bits(out);
SASSERT(!has_overflow(out));
}
@ -421,9 +429,28 @@ namespace bv {
void sls_valuation::get_variant(bvect& dst, random_gen& r) const {
for (unsigned i = 0; i < nw; ++i)
dst[i] = (random_bits(r) & ~fixed[i]) | (fixed[i] & m_bits[i]);
repair_sign_bits(dst);
clear_overflow_bits(dst);
}
void sls_valuation::repair_sign_bits(bvect& dst) const {
if (m_signed_prefix == 0)
return;
bool sign = dst.get(bw - 1);
for (unsigned i = bw; i-- >= bw - m_signed_prefix; ) {
if (dst.get(i) != sign) {
if (fixed.get(i)) {
for (unsigned i = bw; i-- >= bw - m_signed_prefix; )
if (!fixed.get(i))
dst.set(i, !sign);
return;
}
else
dst.set(i, sign);
}
}
}
//
// new_bits != bits => ~fixed
// 0 = (new_bits ^ bits) & fixed