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[ARITH] fix zero iter bug in arith #8494

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Jul 18, 2021
Merged

[ARITH] fix zero iter bug in arith #8494

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3711860
fix
Jul 17, 2021
25e24ab
black
Jul 17, 2021
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1 change: 0 additions & 1 deletion src/arith/iter_affine_map.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -515,7 +515,6 @@ class IterMapRewriter : public ExprMutator {
*/
Optional<IterSplitExpr> TryFuseIters(IterSumExpr expr) {
if (!is_zero(expr->base)) return NullOpt;
if (expr->args.size() == 1) return expr->args[0];
// select the iterators in order
std::vector<bool> visited(expr->args.size(), false);
std::vector<IterSplitExpr> flattened_iters, grouped_iters;
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9 changes: 9 additions & 0 deletions tests/python/unittest/test_arith_iter_affine_map.py
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Expand Up @@ -285,6 +285,15 @@ def test_predicate():
)
assert len(res) == 0

# zero iter
xo = tvm.tir.Var("xo", "int32"), 1
xi = tvm.tir.Var("xi", "int32"), 129
y = tvm.tir.Var("y", "int32"), 128

res = tvm.arith.detect_iter_map(
[xo[0] * 129 + xi[0], y[0]], var_dom([xo, xi, y]), xo[0] * 129 + xi[0] < 128
)


def convert_division(divisions):
if divisions is None or len(divisions) == 0:
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