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arithmetic

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2024-01-13 10:29:50 -08:00
parent 33c43a474d
commit 93be3d2b2c
4 changed files with 53 additions and 22 deletions
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13
src/sat/smt/polysat/viable.cpp
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@ -643,9 +643,15 @@ namespace polysat {
// Then value is chosen, min x . coeff * x >= t.
// In other words:
//
// coeff * (value - 1) <= t < coeff*value + 1
//
auto vlo = c.value(mod((e.value - 1) * p2eb, p2b), bw);
// x >= t div coeff
// => t <= coeff * x
// (x - 1) * coeff < t <= x * coeff
// a < x <= b <=>
// a + 1 <= x < b + 1
auto vlo = c.value(mod((e.value - 1) * p2eb + 1, p2b), bw);
auto vhi = c.value(mod(e.value * p2eb + 1, p2b), bw);
#if 0
@ -655,6 +661,7 @@ namespace polysat {
verbose_stream() << "before bw " << ebw << " " << bw << " " << *e.e << "\nafter bw " << abw << " " << aw << " " << *after.e << "\n";
if (!t.is_val())
IF_VERBOSE(0, verbose_stream() << "symbolic t : " << t << "\n");
#endif
auto sc = cs.ult(t - vlo, vhi - vlo);
CTRACE("bv", sc.is_always_false(), c.display(tout));