forked from M-Labs/artiq
sawg: cleanup sat_add logic
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@ -44,13 +44,15 @@ class SatAddMixin:
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full.eq(reduce(add, a)),
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]
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if limits is None:
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sign = Signal()
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self.comb += [
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If(full[-1-carry:] == Replicate(full[-1], carry + 1),
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sign.eq(full[-1]),
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If(full[-1-carry:] == Replicate(sign, carry + 1),
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clip.eq(0),
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limited.eq(full),
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).Else(
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clip.eq(Cat(full[-1], ~full[-1])),
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limited.eq(Cat(Replicate(~full[-1], length - 1), full[-1])),
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clip.eq(Cat(sign, ~sign)),
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limited.eq(Cat(Replicate(~sign, length - 1), sign)),
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)
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]
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else:
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