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hdl.ast: fix range handling in Shape.cast.

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Fixes #803.
This commit is contained in:
Marcelina Kościelnicka 2023-06-07 11:45:56 +02:00 • committed by Catherine
parent fcbc8bd46f
commit c7984463c7
2 changed files with 6 additions and 3 deletions
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6
amaranth/hdl/ast.py
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@ -117,9 +117,9 @@ class Shape:
elif isinstance(obj, range):
if len(obj) == 0:
return Shape(0, obj.start < 0)
signed = obj.start < 0 or (obj.stop - obj.step) < 0
width = max(bits_for(obj.start, signed),
bits_for(obj.stop - obj.step, signed))
signed = obj[0] < 0 or obj[-1] < 0
width = max(bits_for(obj[0], signed),
bits_for(obj[-1], signed))
return Shape(width, signed)
elif isinstance(obj, type) and issubclass(obj, Enum):
# For compatibility with third party enumerations, handle them as if they were