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fix #4808

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-11-21 15:03:05 -08:00
parent d6106f26ff
commit 299e1788b8
3 changed files with 0 additions and 11 deletions
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9
src/ast/rewriter/bv_rewriter.cpp
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@ -31,7 +31,6 @@ void bv_rewriter::updt_local_params(params_ref const & _p) {
m_bit2bool = p.bit2bool();
m_blast_eq_value = p.blast_eq_value();
m_split_concat_eq = p.split_concat_eq();
m_bvnot2arith = p.bvnot2arith();
m_bvnot_simpl = p.bv_not_simpl();
m_bv_sort_ac = p.bv_sort_ac();
m_mkbv2num = _p.get_bool("mkbv2num", false);
@ -1986,14 +1985,6 @@ br_status bv_rewriter::mk_bv_not(expr * arg, expr_ref & result) {
return BR_REWRITE2;
}
if (m_bvnot2arith) {
// (bvnot x) --> (bvsub -1 x)
bv_size = get_bv_size(arg);
rational minus_one = (rational::power_of_two(bv_size) - numeral(1));
result = m_util.mk_bv_sub(m_util.mk_numeral(minus_one, bv_size), arg);
return BR_REWRITE1;
}
if (m_bvnot_simpl) {
expr *s(nullptr), *t(nullptr);
if (m_util.is_bv_mul(arg, s, t)) {

1
src/ast/rewriter/bv_rewriter.h
View file

@ -56,7 +56,6 @@ class bv_rewriter : public poly_rewriter<bv_rewriter_core> {
bool m_mkbv2num;
bool m_ite2id;
bool m_split_concat_eq;
bool m_bvnot2arith;
bool m_bv_sort_ac;
bool m_extract_prop;
bool m_bvnot_simpl;

1
src/params/bv_rewriter_params.pyg
View file

@ -7,7 +7,6 @@ def_module_params(module_name='rewriter',
("elim_sign_ext", BOOL, True, "expand sign-ext operator using concat and extract"),
("hi_div0", BOOL, True, "use the 'hardware interpretation' for division by zero (for bit-vector terms)"),
("mul2concat", BOOL, False, "replace multiplication by a power of two into a concatenation"),
("bvnot2arith", BOOL, False, "replace (bvnot x) with (bvsub -1 x)"),
("bv_sort_ac", BOOL, False, "sort the arguments of all AC operators"),
("bv_extract_prop", BOOL, False, "attempt to partially propagate extraction inwards"),
("bv_not_simpl", BOOL, False, "apply simplifications for bvnot"),