tqchen commented on a change in pull request #5772:
URL: https://github.com/apache/incubator-tvm/pull/5772#discussion_r442947630
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File path: src/arith/rewrite_simplify.cc
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@@ -353,6 +353,15 @@ PrimExpr RewriteSimplifier::Impl::VisitExpr_(const
SubNode* op) {
truncdiv(x + c1, c3) - truncdiv(x, c3), truncdiv(truncmod(x, c3) + c1,
c3),
CanProveGreaterEqual(x.Eval(), 0) && c1.Eval()->value >= 0 &&
c3.Eval()->value > 0);
+ TVM_TRY_REWRITE_IF(truncdiv(x * c1 + c2, c3) - truncdiv(x * c1 + c4, c3),
truncdiv(c2 - c4, c3),
+ c1.Eval()->value >= 0 && c2.Eval()->value > 0 &&
c3.Eval()->value > 0 &&
Review comment:
Would be great if we can write down a proof for the rule. or a tabular
validation. This rule is quite similar to the rule above(which translates into
an additional truncmod), but this rule does not.
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