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local sort

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-06-14 09:29:41 -07:00
parent ec1653fdff
commit 1e770af1cc
1 changed files with 18 additions and 3 deletions

21
src/ast/rewriter/bool_rewriter.cpp
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@ -19,6 +19,8 @@ Notes:
#include "ast/rewriter/bool_rewriter.h"
#include "ast/rewriter/bool_rewriter_params.hpp"
#include "ast/rewriter/rewriter_def.h"
#include "ast/ast_lt.h"
#include <algorithm>
void bool_rewriter::updt_params(params_ref const & _p) {
bool_rewriter_params p(_p);
@ -176,6 +178,7 @@ br_status bool_rewriter::mk_nflat_or_core(unsigned num_args, expr * const * args
ptr_buffer<expr> buffer;
expr_fast_mark1 neg_lits;
expr_fast_mark2 pos_lits;
expr* prev = nullptr;
for (unsigned i = 0; i < num_args; i++) {
expr * arg = args[i];
if (m().is_true(arg)) {
@ -186,8 +189,8 @@ br_status bool_rewriter::mk_nflat_or_core(unsigned num_args, expr * const * args
s = true;
continue;
}
if (m().is_not(arg)) {
expr * atom = to_app(arg)->get_arg(0);
expr* atom = nullptr;
if (m().is_not(arg, atom)) {
if (neg_lits.is_marked(atom)) {
s = true;
continue;
@ -210,6 +213,8 @@ br_status bool_rewriter::mk_nflat_or_core(unsigned num_args, expr * const * args
pos_lits.mark(arg);
}
buffer.push_back(arg);
s |= prev && lt(arg, prev);
prev = arg;
}
unsigned sz = buffer.size();
@ -229,6 +234,7 @@ br_status bool_rewriter::mk_nflat_or_core(unsigned num_args, expr * const * args
return BR_DONE;
}
if (s) {
std::sort(buffer.begin(), buffer.end(), ast_to_lt());
result = m().mk_or(sz, buffer.c_ptr());
return BR_DONE;
}
@ -243,6 +249,8 @@ br_status bool_rewriter::mk_flat_or_core(unsigned num_args, expr * const * args,
if (m().is_or(args[i]))
break;
}
bool ordered = true;
expr* prev = nullptr;
if (i < num_args) {
// has nested ORs
ptr_buffer<expr> flat_args;
@ -251,16 +259,23 @@ br_status bool_rewriter::mk_flat_or_core(unsigned num_args, expr * const * args,
expr * arg = args[i];
// Remark: all rewrites are depth 1.
if (m().is_or(arg)) {
ordered = false;
unsigned num = to_app(arg)->get_num_args();
for (unsigned j = 0; j < num; j++)
flat_args.push_back(to_app(arg)->get_arg(j));
}
else {
flat_args.push_back(arg);
ordered &= !prev || !lt(arg, prev);
prev = arg;
}
}
if (mk_nflat_or_core(flat_args.size(), flat_args.c_ptr(), result) == BR_FAILED)
if (mk_nflat_or_core(flat_args.size(), flat_args.c_ptr(), result) == BR_FAILED) {
if (!ordered) {
std::sort(flat_args.begin(), flat_args.end(), ast_to_lt());
}
result = m().mk_or(flat_args.size(), flat_args.c_ptr());
}
return BR_DONE;
}
return mk_nflat_or_core(num_args, args, result);