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[skip ci][Bugfix] Allow constant folding of 0U - 0U #10535

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Merged
masahi merged 1 commit into from
Mar 9, 2022
Merged

[skip ci][Bugfix] Allow constant folding of 0U - 0U #10535

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3 changes: 2 additions & 1 deletion src/arith/const_fold.h
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,8 @@ inline PrimExpr TryConstFold<tir::Add>(PrimExpr a, PrimExpr b) {
template <>
inline PrimExpr TryConstFold<tir::Sub>(PrimExpr a, PrimExpr b) {
TVM_ARITH_CONST_PROPAGATION({
ICHECK(!(pa && pa->dtype.is_uint() && pa->value == 0U && b.dtype().is_uint()))
ICHECK(!((pa && pa->dtype.is_uint() && pa->value == 0U) &&
(pb && pb->dtype.is_uint() && pb->value > 0U)))
<< "Checked failed. Minuend 's value is 0U and it's dtype is uint "
<< "while Subtrahend's dtype is uint; which will cause a negative uint";
const DataType& rtype = a.dtype();
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