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Bugfix for bv*div0 model construction.

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This commit is contained in:
Christoph M. Wintersteiger 2016-02-05 13:53:35 +00:00
parent 88f007e9da
commit bb5118acbb
4 changed files with 27 additions and 6 deletions
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15
src/ast/bv_decl_plugin.h
View file

@ -354,6 +354,21 @@ public:
bool has_sign_bit(rational const & n, unsigned bv_size) const;
bool mult_inverse(rational const & n, unsigned bv_size, rational & result);
bool is_considered_uninterpreted(func_decl * f) {
if (f->get_family_id() != get_family_id())
return false;
switch (f->get_decl_kind()) {
case OP_BSDIV0:
case OP_BUDIV0:
case OP_BSREM0:
case OP_BUREM0:
case OP_BSMOD0:
return true;
default:
return false;
}
return false;
}
};
class bv_util : public bv_recognizers {

6
src/ast/rewriter/bv_rewriter.cpp
View file

@ -694,7 +694,7 @@ br_status bv_rewriter::mk_bv_sdiv_core(expr * arg1, expr * arg2, bool hi_div0, e
if (r2.is_zero()) {
if (!hi_div0) {
result = m().mk_app(get_fid(), OP_BSDIV0, arg1);
return BR_DONE;
return BR_REWRITE1;
}
else {
// The "hardware interpretation" for (bvsdiv x 0) is (ite (bvslt x #x0000) #x0001 #xffff)
@ -745,7 +745,7 @@ br_status bv_rewriter::mk_bv_udiv_core(expr * arg1, expr * arg2, bool hi_div0, e
if (r2.is_zero()) {
if (!hi_div0) {
result = m().mk_app(get_fid(), OP_BUDIV0, arg1);
return BR_DONE;
return BR_REWRITE1;
}
else {
// The "hardware interpretation" for (bvudiv x 0) is #xffff
@ -808,7 +808,7 @@ br_status bv_rewriter::mk_bv_srem_core(expr * arg1, expr * arg2, bool hi_div0, e
if (r2.is_zero()) {
if (!hi_div0) {
result = m().mk_app(get_fid(), OP_BSREM0, arg1);
return BR_DONE;
return BR_REWRITE1;
}
else {
// The "hardware interpretation" for (bvsrem x 0) is x

6
src/ast/rewriter/bv_rewriter.h
View file

@ -155,7 +155,7 @@ public:
void updt_params(params_ref const & p);
static void get_param_descrs(param_descrs & r);
void set_mkbv2num(bool f) { m_mkbv2num = f; }
unsigned get_bv_size(expr * t) const {return m_util.get_bv_size(t); }
@ -164,7 +164,7 @@ public:
bool is_bv(expr * t) const { return m_util.is_bv(t); }
expr * mk_numeral(numeral const & v, unsigned sz) { return m_util.mk_numeral(v, sz); }
expr * mk_numeral(unsigned v, unsigned sz) { return m_util.mk_numeral(numeral(v), sz); }
br_status mk_app_core(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result);
void mk_app(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) {
if (mk_app_core(f, num_args, args, result) == BR_FAILED)
@ -174,6 +174,8 @@ public:
br_status mk_eq_core(expr * lhs, expr * rhs, expr_ref & result);
bool hi_div0() const { return m_hi_div0; }
bv_util & get_util() { return m_util; }
};
#endif