[Mlir-commits] [mlir] [mlir][python] fix up affine for (PR #74495)

[Maksim Levental]

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@@ -45,23 +46,50 @@ def __init__(
         - `lower_bound_operands` is the list of arguments to substitute the dimensions,
           then symbols in the `lower_bound` affine map, in an increasing order
         - `upper_bound_operands` is the list of arguments to substitute the dimensions,
-          then symbols in the `upper_bound` affine map, in an increasing order
+          then symbols in the `upper_bound` affine map, in an increasing order.
         """
 
+        if lower_bound_operands is None:
+            lower_bound_operands = []
+        if upper_bound_operands is None:
+            upper_bound_operands = []
+
+        if step is None:
+            step = 1
+        if upper_bound is None:
+            upper_bound, lower_bound = lower_bound, 0
+
+        if isinstance(lower_bound, int):
+            lower_bound = AffineMap.get_constant(lower_bound)
+        elif isinstance(lower_bound, (Operation, OpView, Value)):
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makslevental wrote:

Splat doesn't work for <3.10 but lucky for us `Union` has a tuple "constructor" so just `_Union[ResultValueTypeTuple]` works.

https://github.com/llvm/llvm-project/pull/74495