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interpolation fix

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Ken McMillan 2014-03-24 11:33:09 -07:00
parent fb2caf99e6
commit e3c1cdfe8c
1 changed files with 14 additions and 0 deletions
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14
src/interp/iz3proof_itp.cpp
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@ -550,6 +550,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
else if(g == symm) res = simplify_symm(args);
else if(g == modpon) res = simplify_modpon(args);
else if(g == sum) res = simplify_sum(args);
else if(g == exmid) res = simplify_exmid(args);
#if 0
else if(g == cong) res = simplify_cong(args);
else if(g == modpon) res = simplify_modpon(args);
@ -1097,6 +1098,17 @@ class iz3proof_itp_impl : public iz3proof_itp {
}
ast simplify_exmid(const std::vector<ast> &args){
if(is_equivrel(args[0])){
ast Aproves = mk_true(), Bproves = mk_true();
ast chain = destruct_cond_ineq(args[1],Aproves,Bproves);
ast Q2 = destruct_cond_ineq(args[2],Aproves,Bproves);
ast interp = contra_chain(Q2,chain);
return my_and(Aproves,my_implies(Bproves,interp));
}
throw "bad exmid";
}
bool is_equivrel(const ast &p){
opr o = op(p);
return o == Equal || o == Iff;
@ -1381,6 +1393,8 @@ class iz3proof_itp_impl : public iz3proof_itp {
if(pos == top_pos && op(equality) == Iff && !is_true(arg(equality,0)))
throw "bad rewrite";
#endif
if(!is_equivrel(equality))
throw "bad rewrite";
return make(t == LitA ? rewrite_A : rewrite_B, pos, cond, equality);
}