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NRA HINTS PATCH #543

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Dec 11, 2024
Merged

NRA HINTS PATCH #543

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9 changes: 1 addition & 8 deletions src/mcsat/nra/nra_plugin.c
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Original file line number Diff line number Diff line change
Expand Up @@ -802,7 +802,7 @@ void nra_plugin_process_unit_constraint(nra_plugin_t* nra, trail_token_t* prop,

// We don't do any hinting for complicated algebraic values
if (lp_value_is_rational(&x_value)) {
if (lp_feasibility_set_is_point(feasible_set)) {
if (lp_feasibility_set_is_point(feasible_set) || (x_is_int_var && lp_feasibility_set_is_point_int(feasible_set))) {
if (trail_is_at_base_level(nra->ctx->trail) && !nra->ctx->options->model_interpolation) {
mcsat_value_t value;
mcsat_value_construct_lp_value(&value, &x_value);
Expand All @@ -814,13 +814,6 @@ void nra_plugin_process_unit_constraint(nra_plugin_t* nra, trail_token_t* prop,
}
nra->ctx->hint_next_decision(nra->ctx, x);
}
} else if (x_is_int_var && lp_feasibility_set_is_point_int(feasible_set)) {
// hint integer variable;
// a good candidate for next decision as the feasibility set contains a single integer solution
if (ctx_trace_enabled(nra->ctx, "nra::propagate")) {
ctx_trace_printf(nra->ctx, "nra: hinting variable = %d\n", x);
}
nra->ctx->hint_next_decision(nra->ctx, x);
} else if (!lp_feasibility_set_is_full(feasible_set)) {
lp_interval_t x_interval;
lp_interval_construct_full(&x_interval); // [-inf, +inf]
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