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some interpolation fixes, plus some options to remove features for testing in duality

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This commit is contained in:
Ken McMillan 2014-02-09 16:04:02 -08:00
parent f380e31a6b
commit ba193a59b1
9 changed files with 176 additions and 14 deletions
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64
src/interp/iz3proof_itp.cpp Normal file → Executable file
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@ -677,8 +677,11 @@ class iz3proof_itp_impl : public iz3proof_itp {
}
ast rotate_sum_rec(const ast &pl, const ast &pf, ast &Bproves, ast &ineq){
if(pf == pl)
if(pf == pl){
if(sym(ineq) == normal)
return my_implies(Bproves,ineq);
return my_implies(Bproves,simplify_ineq(ineq));
}
if(op(pf) == Uninterpreted && sym(pf) == sum){
if(arg(pf,2) == pl){
ast Aproves = mk_true();
@ -829,6 +832,8 @@ class iz3proof_itp_impl : public iz3proof_itp {
ast equa = sep_cond(args[0],cond);
if(is_equivrel_chain(equa))
return my_implies(cond,reverse_chain(equa));
if(is_negation_chain(equa))
return commute_negation_chain(equa);
throw cannot_simplify();
}
@ -1443,6 +1448,50 @@ class iz3proof_itp_impl : public iz3proof_itp {
return is_negation_chain(rest);
}
ast commute_negation_chain(const ast &chain){
if(is_true(chain))
return chain;
ast last = chain_last(chain);
ast rest = chain_rest(chain);
if(is_true(rest)){
ast old = rewrite_rhs(last);
if(!(op(old) == Not))
throw "bad negative equality chain";
ast equ = arg(old,0);
if(!is_equivrel(equ))
throw "bad negative equality chain";
last = rewrite_update_rhs(last,top_pos,make(Not,make(op(equ),arg(equ,1),arg(equ,0))),make(True));
return chain_cons(rest,last);
}
ast pos = rewrite_pos(last);
if(pos == top_pos)
throw "bad negative equality chain";
int idx = pos_arg(pos);
if(idx != 0)
throw "bad negative equality chain";
pos = arg(pos,1);
if(pos == top_pos){
ast lhs = rewrite_lhs(last);
ast rhs = rewrite_rhs(last);
if(op(lhs) != Equal || op(rhs) != Equal)
throw "bad negative equality chain";
last = make_rewrite(rewrite_side(last),rewrite_pos(last),rewrite_cond(last),
make(Iff,make(Equal,arg(lhs,1),arg(lhs,0)),make(Equal,arg(rhs,1),arg(rhs,0))));
}
else {
idx = pos_arg(pos);
if(idx == 0)
idx = 1;
else if(idx == 1)
idx = 0;
else
throw "bad negative equality chain";
pos = pos_add(0,pos_add(idx,arg(pos,1)));
last = make_rewrite(rewrite_side(last),pos,rewrite_cond(last),rewrite_equ(last));
}
return chain_cons(commute_negation_chain(rest),last);
}
// split a rewrite chain into head and tail at last top-level rewrite
ast get_head_chain(const ast &chain, ast &tail, bool is_not = true){
ast last = chain_last(chain);
@ -2240,10 +2289,19 @@ class iz3proof_itp_impl : public iz3proof_itp {
throw proof_error();
}
}
Qrhs = make(Times,c,Qrhs);
#if 0
bool pstrict = op(P) == Lt, strict = pstrict || qstrict;
if(pstrict && qstrict && round_off)
Qrhs = make(Sub,Qrhs,make_int(rational(1)));
#else
bool pstrict = op(P) == Lt;
if(qstrict && round_off && (pstrict || !(c == make_int(rational(1))))){
Qrhs = make(Sub,Qrhs,make_int(rational(1)));
qstrict = false;
}
Qrhs = make(Times,c,Qrhs);
bool strict = pstrict || qstrict;
#endif
if(strict)
P = make(Lt,arg(P,0),make(Plus,arg(P,1),Qrhs));
else
@ -2427,7 +2485,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
return e; // this term occurs in range, so it's O.K.
if(is_array_type(get_type(e)))
throw "help!";
std::cerr << "WARNING: array quantifier\n";
// choose a frame for the constraint that is close to range
int frame = pv->range_near(pv->ast_scope(e),rng);