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lib.data: fix Layout.const masking for signed fields.

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Fixes #846.
This commit is contained in:
Marcelina Kościelnicka 2023-07-22 02:21:59 +02:00 • committed by Catherine
parent 7a9dbc8c11
commit f6c38061ff
2 changed files with 9 additions and 2 deletions
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5
amaranth/lib/data.py
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@ -240,8 +240,9 @@ class Layout(ShapeCastable, metaclass=ABCMeta):
key_value.shape()))
elif not isinstance(key_value, Const):
key_value = Const(key_value, cast_field_shape)
int_value &= ~(((1 << cast_field_shape.width) - 1) << field.offset)
int_value |= key_value.value << field.offset
mask = ((1 << cast_field_shape.width) - 1) << field.offset
int_value &= ~mask
int_value |= (key_value.value << field.offset) & mask
return Const(int_value, self.as_shape())