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add rewrite for mod over negation, refine axioms for grobner quotients

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Nikolaj Bjorner 2025-09-02 18:26:22 -07:00
parent e2235d81d3
commit a382ddbd8a
4 changed files with 95 additions and 66 deletions
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6
src/ast/rewriter/arith_rewriter.cpp
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@ -1419,6 +1419,12 @@ br_status arith_rewriter::mk_mod_core(expr * arg1, expr * arg2, expr_ref & resul
return BR_REWRITE1;
}
// mod x -y = mod x y
if (m_util.is_mul(arg2, t1, t2) && m_util.is_numeral(t1, v1) && v1 == -1) {
result = m_util.mk_mod(arg1, t2);
return BR_REWRITE1;
}
return BR_FAILED;
}