mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-29 11:55:51 +00:00
Code Activity

Partial fix for fp,min/fp.max models

Browse source
This commit is contained in:
Christoph M. Wintersteiger 2015-10-13 14:29:08 +01:00
parent e3ed0159a8
commit 099775947e
9 changed files with 115 additions and 148 deletions
Download patch file Download diff file Expand all files Collapse all files

58
src/ast/rewriter/fpa_rewriter.cpp
View file

@ -93,6 +93,8 @@ br_status fpa_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_FPA_TO_IEEE_BV: SASSERT(num_args == 1); st = mk_to_ieee_bv(f, args[0], result); break;
case OP_FPA_TO_REAL: SASSERT(num_args == 1); st = mk_to_real(args[0], result); break;
case OP_FPA_INTERNAL_MIN_I:
case OP_FPA_INTERNAL_MAX_I:
case OP_FPA_INTERNAL_MIN_UNSPECIFIED:
case OP_FPA_INTERNAL_MAX_UNSPECIFIED:
SASSERT(num_args == 2); st = BR_FAILED; break;
@ -432,21 +434,23 @@ br_status fpa_rewriter::mk_min(expr * arg1, expr * arg2, expr_ref & result) {
}
scoped_mpf v1(m_fm), v2(m_fm);
if (m_util.is_numeral(arg1, v1) && m_util.is_numeral(arg2, v2)) {
if (m_fm.is_zero(v1) && m_fm.is_zero(v2) && m_fm.sgn(v1) != m_fm.sgn(v2)) {
// Result could be +zero or -zero.
result = m_util.mk_internal_min_unspecified(arg1, arg2);
return BR_DONE;
}
else {
scoped_mpf r(m_fm);
m_fm.minimum(v1, v2, r);
result = m_util.mk_value(r);
return BR_DONE;
}
if (m_util.is_numeral(arg1, v1) && m_util.is_numeral(arg2, v2) &&
!(m_fm.is_zero(v1) && m_fm.is_zero(v2) && m_fm.sgn(v1) != m_fm.sgn(v2))) {
scoped_mpf r(m_fm);
m_fm.minimum(v1, v2, r);
result = m_util.mk_value(r);
return BR_DONE;
}
else {
expr_ref c(m()), v(m());
c = m().mk_and(m().mk_and(m_util.mk_is_zero(arg1), m_util.mk_is_zero(arg2)),
m().mk_or(m().mk_and(m_util.mk_is_positive(arg1), m_util.mk_is_negative(arg2)),
m().mk_and(m_util.mk_is_negative(arg1), m_util.mk_is_positive(arg2))));
v = m().mk_app(get_fid(), OP_FPA_INTERNAL_MIN_UNSPECIFIED, arg1, arg2);
return BR_FAILED;
result = m().mk_ite(c, v, m().mk_app(get_fid(), OP_FPA_INTERNAL_MIN_I, arg1, arg2));
return BR_REWRITE_FULL;
}
}
br_status fpa_rewriter::mk_max(expr * arg1, expr * arg2, expr_ref & result) {
@ -460,21 +464,23 @@ br_status fpa_rewriter::mk_max(expr * arg1, expr * arg2, expr_ref & result) {
}
scoped_mpf v1(m_fm), v2(m_fm);
if (m_util.is_numeral(arg1, v1) && m_util.is_numeral(arg2, v2)) {
if (m_fm.is_zero(v1) && m_fm.is_zero(v2) && m_fm.sgn(v1) != m_fm.sgn(v2)) {
// Result could be +zero or -zero.
result = m_util.mk_internal_max_unspecified(arg1, arg2);
return BR_REWRITE_FULL;
}
else {
scoped_mpf r(m_fm);
m_fm.maximum(v1, v2, r);
result = m_util.mk_value(r);
return BR_DONE;
}
if (m_util.is_numeral(arg1, v1) && m_util.is_numeral(arg2, v2) &&
!(m_fm.is_zero(v1) && m_fm.is_zero(v2) && m_fm.sgn(v1) != m_fm.sgn(v2))) {
scoped_mpf r(m_fm);
m_fm.maximum(v1, v2, r);
result = m_util.mk_value(r);
return BR_DONE;
}
else {
expr_ref c(m()), v(m());
c = m().mk_and(m().mk_and(m_util.mk_is_zero(arg1), m_util.mk_is_zero(arg2)),
m().mk_or(m().mk_and(m_util.mk_is_positive(arg1), m_util.mk_is_negative(arg2)),
m().mk_and(m_util.mk_is_negative(arg1), m_util.mk_is_positive(arg2))));
v = m().mk_app(get_fid(), OP_FPA_INTERNAL_MAX_UNSPECIFIED, arg1, arg2);
return BR_FAILED;
result = m().mk_ite(c, v, m().mk_app(get_fid(), OP_FPA_INTERNAL_MAX_I, arg1, arg2));
return BR_REWRITE_FULL;
}
}
br_status fpa_rewriter::mk_fma(expr * arg1, expr * arg2, expr * arg3, expr * arg4, expr_ref & result) {