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Fixed and refactored fp.min/fp.max for theory_fpa.

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Fixes #616
This commit is contained in:
Christoph M. Wintersteiger 2016-05-23 15:38:25 +01:00
parent 184aebab59
commit bf3a5effbc
6 changed files with 51 additions and 83 deletions
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37
src/ast/fpa/fpa2bv_converter.cpp
View file

@ -1156,13 +1156,13 @@ void fpa2bv_converter::mk_min_i(func_decl * f, unsigned num, expr * const * args
SASSERT(is_well_sorted(m, result));
}
expr_ref fpa2bv_converter::mk_min_unspecified(func_decl * f, expr * x, expr * y) {
expr_ref fpa2bv_converter::mk_min_max_unspecified(func_decl * f, expr * x, expr * y) {
unsigned ebits = m_util.get_ebits(f->get_range());
unsigned sbits = m_util.get_sbits(f->get_range());
expr_ref res(m);
// The only cases in which min is unspecified for is when the arguments are +0.0 and -0.0.
// There is no "hardware interpretation" for fp.min.
// The only cases in which min/max is unspecified for is when the arguments are +0.0 and -0.0.
// There is no "hardware interpretation" for fp.min/fp.max.
std::pair<app*, app*> decls(0, 0);
if (!m_specials.find(f, decls)) {
@ -1237,37 +1237,6 @@ void fpa2bv_converter::mk_max_i(func_decl * f, unsigned num, expr * const * args
SASSERT(is_well_sorted(m, result));
}
expr_ref fpa2bv_converter::mk_max_unspecified(func_decl * f, expr * x, expr * y) {
unsigned ebits = m_util.get_ebits(f->get_range());
unsigned sbits = m_util.get_sbits(f->get_range());
expr_ref res(m);
// The only cases in which max is unspecified for is when the arguments are +0.0 and -0.0.
// There is no "hardware interpretation" for fp.max.
std::pair<app*, app*> decls(0, 0);
if (!m_specials.find(f, decls)) {
decls.first = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
decls.second = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
m_specials.insert(f, decls);
m.inc_ref(f);
m.inc_ref(decls.first);
m.inc_ref(decls.second);
}
expr_ref pn(m), np(m);
pn = m_util.mk_fp(decls.first, m_bv_util.mk_numeral(0, ebits), m_bv_util.mk_numeral(0, sbits - 1));
np = m_util.mk_fp(decls.second, m_bv_util.mk_numeral(0, ebits), m_bv_util.mk_numeral(0, sbits - 1));
expr_ref x_is_pzero(m), y_is_nzero(m), xyzero(m);
mk_is_pzero(x, x_is_pzero);
mk_is_nzero(y, y_is_nzero);
m_simp.mk_and(x_is_pzero, y_is_nzero, xyzero);
mk_ite(xyzero, pn, np, res);
return res;
}
void fpa2bv_converter::mk_fma(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
SASSERT(num == 4);
SASSERT(m_util.is_rm_bvwrap(args[0]));

3
src/ast/fpa/fpa2bv_converter.h
View file

@ -133,11 +133,10 @@ public:
void mk_min(func_decl * f, unsigned num, expr * const * args, expr_ref & result);
void mk_min_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result);
virtual expr_ref mk_min_unspecified(func_decl * f, expr * x, expr * y);
virtual expr_ref mk_min_max_unspecified(func_decl * f, expr * x, expr * y);
void mk_max(func_decl * f, unsigned num, expr * const * args, expr_ref & result);
void mk_max_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result);
virtual expr_ref mk_max_unspecified(func_decl * f, expr * x, expr * y);
expr_ref mk_to_ubv_unspecified(unsigned ebits, unsigned sbits, unsigned width);
expr_ref mk_to_sbv_unspecified(unsigned ebits, unsigned sbits, unsigned width);

4
src/ast/fpa/fpa2bv_rewriter.cpp
View file

@ -150,8 +150,8 @@ br_status fpa2bv_rewriter_cfg::reduce_app(func_decl * f, unsigned num, expr * co
case OP_FPA_MIN: m_conv.mk_min(f, num, args, result); return BR_REWRITE_FULL;
case OP_FPA_MAX: m_conv.mk_max(f, num, args, result); return BR_REWRITE_FULL;
case OP_FPA_INTERNAL_MIN_UNSPECIFIED: result = m_conv.mk_min_unspecified(f, args[0], args[1]); return BR_DONE;
case OP_FPA_INTERNAL_MAX_UNSPECIFIED: result = m_conv.mk_max_unspecified(f, args[0], args[1]); return BR_DONE;
case OP_FPA_INTERNAL_MIN_UNSPECIFIED:
case OP_FPA_INTERNAL_MAX_UNSPECIFIED: result = m_conv.mk_min_max_unspecified(f, args[0], args[1]); return BR_DONE;
case OP_FPA_INTERNAL_MIN_I: m_conv.mk_min_i(f, num, args, result); return BR_DONE;
case OP_FPA_INTERNAL_MAX_I: m_conv.mk_max_i(f, num, args, result); return BR_DONE;