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block flips to units

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This commit is contained in:
Nikolaj Bjorner 2025-01-01 16:01:58 -08:00
parent cb61af0496
commit 814d7f4d0a
3 changed files with 15 additions and 4 deletions
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14
src/ast/sls/sls_bv_lookahead.cpp
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@ -106,8 +106,11 @@ namespace sls {
return false;
expr* e = vars[ctx.rand(vars.size())];
if (m.is_bool(e)) {
auto v = ctx.atom2bool_var(e);
if (ctx.is_unit(v))
return false ;
TRACE("bv", tout << "random flip " << mk_bounded_pp(e, m) << "\n";);
ctx.flip(ctx.atom2bool_var(e));
ctx.flip(v);
return true;
}
SASSERT(bv.is_bv(e));
@ -126,7 +129,10 @@ namespace sls {
expr* e = vars[ctx.rand(vars.size())];
if (m.is_bool(e)) {
TRACE("bv", tout << "random move flip " << mk_bounded_pp(e, m) << "\n";);
ctx.flip(ctx.atom2bool_var(e));
auto v = ctx.atom2bool_var(e);
if (ctx.is_unit(v))
return false;
ctx.flip(v);
return true;
}
SASSERT(bv.is_bv(e));
@ -370,6 +376,8 @@ namespace sls {
}
double bv_lookahead::lookahead_flip(sat::bool_var v) {
if (ctx.is_unit(v))
return -100;
auto a = ctx.atom(v);
return lookahead_update(a, m_v_updated);
}
@ -541,6 +549,8 @@ namespace sls {
auto v = ctx.atom2bool_var(e);
auto v1 = m_ev.bval1(to_app(e));
if (v != sat::null_bool_var) {
if (ctx.is_unit(v))
continue;
if (ctx.is_true(v) == v1)
continue;
TRACE("bv", tout << "update flip " << mk_bounded_pp(e, m) << "\n";);