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[Fix] Enhance floormod simplification rules for better expression matching #17765

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[Fix] Enhance floormod simplification rules for better expression matching #17765

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3 changes: 2 additions & 1 deletion src/arith/rewrite_simplify.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1230,7 +1230,8 @@ PrimExpr RewriteSimplifier::Impl::VisitExpr_(const FloorModNode* op) {
TVM_TRY_REWRITE_IF(floormod(x + y * c1, c2), floormod(x + y * floormod(c1, c2), c2),
c2.Eval()->value > 0);

TVM_TRY_REWRITE_IF(floormod(x * c1, x * c2), x * floormod(c1, c2), c2.Eval()->value != 0);
TVM_TRY_REWRITE_IF(matches_one_of(floormod(x * c1, x * c2), floormod(c1 * x, c2 * x)),
floormod(c1, c2), c2.Eval()->value != 0);
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@tqchen tqchen Mar 19, 2025 •
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I am a bit surprised to see if we need c * x case since canonical simplify will move most cases to x * c, would be good to understand why original flow fails in this case


TVM_TRY_REWRITE(matches_one_of(floormod(x * y, y), floormod(y * x, y)), ZeroWithTypeLike(y));

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