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propagate mod over ite even if it hurts

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2025-09-02 18:39:29 -07:00
parent a382ddbd8a
commit 7005d04755
1 changed files with 8 additions and 1 deletions
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9
src/ast/rewriter/arith_rewriter.cpp
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@ -1413,7 +1413,7 @@ br_status arith_rewriter::mk_mod_core(expr * arg1, expr * arg2, expr_ref & resul
} }
} }
expr* x, *y; expr* x = nullptr, * y = nullptr, * z = nullptr;
if (is_num2 && v2.is_pos() && m_util.is_mul(arg1, x, y) && m_util.is_numeral(x, v1, is_int) && v1 > 0 && divides(v1, v2)) { if (is_num2 && v2.is_pos() && m_util.is_mul(arg1, x, y) && m_util.is_numeral(x, v1, is_int) && v1 > 0 && divides(v1, v2)) {
result = m_util.mk_mul(m_util.mk_int(v1), m_util.mk_mod(y, m_util.mk_int(v2/v1))); result = m_util.mk_mul(m_util.mk_int(v1), m_util.mk_mod(y, m_util.mk_int(v2/v1)));
return BR_REWRITE1; return BR_REWRITE1;
@ -1425,6 +1425,13 @@ br_status arith_rewriter::mk_mod_core(expr * arg1, expr * arg2, expr_ref & resul
return BR_REWRITE1; return BR_REWRITE1;
} }
if (m.is_ite(arg2, x, y, z)) {
expr_ref mod1(m_util.mk_mod(arg1, y), m);
expr_ref mod2(m_util.mk_mod(arg1, z), m);
result = m.mk_ite(x, mod1, mod2);
return BR_REWRITE3;
}
return BR_FAILED; return BR_FAILED;
} }