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fixed interpolation bug

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Ken McMillan 2013-12-10 16:26:35 -08:00
parent 7043386915
commit d45cbb3cb2
2 changed files with 16 additions and 1 deletions
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15
src/interp/iz3translate.cpp
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@ -1460,6 +1460,21 @@ public:
}
}
/* this is the symmetry rule for ~=, that is, takes x ~= y and yields y ~= x.
the proof idiom uses commutativity, monotonicity and mp, but we replace it here
with symmtrey and resolution, that is, we prove y = x |- x = y, then resolve
with the proof of ~(x=y) to get ~y=x. */
if(dk == PR_MODUS_PONENS && pr(prem(proof,1)) == PR_MONOTONICITY && pr(prem(prem(proof,1),0)) == PR_COMMUTATIVITY && num_prems(prem(proof,1)) == 1){
Iproof::node ante = translate_main(prem(proof,0),false);
ast eq0 = arg(conc(prem(prem(proof,1),0)),0);
ast eq1 = arg(conc(prem(prem(proof,1),0)),1);
Iproof::node eq1hy = iproof->make_hypothesis(eq1);
Iproof::node eq0pf = iproof->make_symmetry(eq0,eq1,eq1hy);
std::vector<ast> clause; // just a dummy
res = iproof->make_resolution(eq0,clause,ante,eq0pf);
return res;
}
// translate all the premises
std::vector<Iproof::node> args(nprems);
for(unsigned i = 0; i < nprems; i++)