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fix bit width of extract on constants

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This commit is contained in:
Jakob Rath 2023-08-04 11:10:49 +02:00
parent d62aa82762
commit 2a2015f61d
2 changed files with 11 additions and 3 deletions
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4
src/math/polysat/constraint_manager.cpp
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@ -591,10 +591,11 @@ namespace polysat {
pdd constraint_manager::extract(pdd const& p, unsigned hi, unsigned lo) {
SASSERT(hi >= lo);
SASSERT(p.power_of_2() > hi);
unsigned const v_sz = hi - lo + 1;
if (p.is_val()) {
// p[hi:lo] = (p >> lo) % 2^(hi - lo + 1)
rational q = mod2k(machine_div2k(p.val(), lo), hi - lo + 1);
return p.manager().mk_val(q);
return s.sz2pdd(v_sz).mk_val(q);
}
if (lo == hi) {
// could turn it into a single-bit constraint... unclear if that is useful
@ -604,6 +605,7 @@ namespace polysat {
}
pvar const src = s.m_names.mk_name(p);
pvar const v = s.m_slicing.mk_extract(src, hi, lo);
SASSERT_EQ(s.var(v).power_of_2(), v_sz);
return s.var(v);
}