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Bugfix for distinct of floats.

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This commit is contained in:
Christoph M. Wintersteiger 2015-06-12 12:58:19 +01:00
parent f84d6bf5bb
commit 6980fb3035
3 changed files with 24 additions and 2 deletions
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14
src/ast/fpa/fpa2bv_converter.cpp
View file

@ -93,6 +93,20 @@ void fpa2bv_converter::mk_ite(expr * c, expr * t, expr * f, expr_ref & result) {
mk_fp(sgn, e, s, result);
}
void fpa2bv_converter::mk_distinct(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
// Note: in SMT there is only one NaN, so multiple of them are considered
// equal, thus (distinct NaN NaN) is false, even if the two NaNs have
// different bitwise representations (see also mk_eq).
result = m.mk_true();
for (unsigned i = 0; i < num; i++) {
for (unsigned j = i+1; j < num; j++) {
expr_ref eq(m);
mk_eq(args[i], args[j], eq);
m_simp.mk_and(result, m.mk_not(eq), result);
}
}
}
void fpa2bv_converter::mk_numeral(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
SASSERT(num == 0);
SASSERT(f->get_num_parameters() == 1);

1
src/ast/fpa/fpa2bv_converter.h
View file

@ -80,6 +80,7 @@ public:
void mk_eq(expr * a, expr * b, expr_ref & result);
void mk_ite(expr * c, expr * t, expr * f, expr_ref & result);
void mk_distinct(func_decl * f, unsigned num, expr * const * args, expr_ref & result);
void mk_rounding_mode(func_decl * f, expr_ref & result);
void mk_numeral(func_decl * f, unsigned num, expr * const * args, expr_ref & result);

11
src/ast/fpa/fpa2bv_rewriter.h
View file

@ -103,8 +103,7 @@ struct fpa2bv_rewriter_cfg : public default_rewriter_cfg {
}
return BR_FAILED;
}
if (m().is_ite(f)) {
else if (m().is_ite(f)) {
SASSERT(num == 3);
if (m_conv.is_float(args[1])) {
m_conv.mk_ite(args[0], args[1], args[2], result);
@ -112,6 +111,14 @@ struct fpa2bv_rewriter_cfg : public default_rewriter_cfg {
}
return BR_FAILED;
}
else if (m().is_distinct(f)) {
sort * ds = f->get_domain()[0];
if (m_conv.is_float(ds) || m_conv.is_rm(ds)) {
m_conv.mk_distinct(f, num, args, result);
return BR_DONE;
}
return BR_FAILED;
}
if (m_conv.is_float_family(f)) {
switch (f->get_decl_kind()) {