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fix #5929 - add parameter bv_le2extract to allow disabling the disassembly to extract

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This commit is contained in:
Nikolaj Bjorner 2022-03-27 18:23:41 -10:00
parent cb1e16fd76
commit 431c3af409
3 changed files with 5 additions and 2 deletions
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3
src/ast/rewriter/bv_rewriter.cpp
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@ -37,6 +37,7 @@ void bv_rewriter::updt_local_params(params_ref const & _p) {
m_extract_prop = p.bv_extract_prop();
m_ite2id = p.bv_ite2id();
m_le_extra = p.bv_le_extra();
m_le2extract = p.bv_le2extract();
set_sort_sums(p.bv_sort_ac());
}
@ -577,7 +578,7 @@ br_status bv_rewriter::mk_leq_core(bool is_signed, expr * a, expr * b, expr_ref
result = m().mk_eq(a, m_util.mk_numeral(numeral(0), bv_sz));
return BR_REWRITE1;
}
else if (first_non_zero < bv_sz - 1) {
else if (first_non_zero < bv_sz - 1 && m_le2extract) {
result = m().mk_and(m().mk_eq(m_mk_extract(bv_sz - 1, first_non_zero + 1, a), m_util.mk_numeral(numeral(0), bv_sz - first_non_zero - 1)),
m_util.mk_ule(m_mk_extract(first_non_zero, 0, a), m_mk_extract(first_non_zero, 0, b)));
return BR_REWRITE3;

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

@ -62,6 +62,7 @@ class bv_rewriter : public poly_rewriter<bv_rewriter_core> {
bool m_extract_prop;
bool m_bvnot_simpl;
bool m_le_extra;
bool m_le2extract;
bool is_zero_bit(expr * x, unsigned idx);

3
src/params/bv_rewriter_params.pyg
View file

@ -11,5 +11,6 @@ def_module_params(module_name='rewriter',
("bv_extract_prop", BOOL, False, "attempt to partially propagate extraction inwards"),
("bv_not_simpl", BOOL, False, "apply simplifications for bvnot"),
("bv_ite2id", BOOL, False, "rewrite ite that can be simplified to identity"),
("bv_le_extra", BOOL, False, "additional bu_(u/s)le simplifications")
("bv_le_extra", BOOL, False, "additional bu_(u/s)le simplifications"),
("bv_le2extract", BOOL, True, "disassemble bvule to extract")
))