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fhdl.ast, back.pysim: implement shifts.

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This commit is contained in:
whitequark 2018-12-15 09:58:30 +00:00
parent 46f5addf05
commit db4600d52b
5 changed files with 50 additions and 16 deletions
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18
nmigen/fhdl/ast.py
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@ -75,13 +75,13 @@ class Value(metaclass=ABCMeta):
def __rdiv__(self, other):
return Operator("/", [other, self])
def __lshift__(self, other):
return Operator("<<<", [self, other])
return Operator("<<", [self, other])
def __rlshift__(self, other):
return Operator("<<<", [other, self])
return Operator("<<", [other, self])
def __rshift__(self, other):
return Operator(">>>", [self, other])
return Operator(">>", [self, other])
def __rrshift__(self, other):
return Operator(">>>", [other, self])
return Operator(">>", [other, self])
def __and__(self, other):
return Operator("&", [self, other])
def __rand__(self, other):
@ -306,15 +306,15 @@ class Operator(Value):
return 1, False
if self.op in ("&", "^", "|"):
return self._bitwise_binary_shape(*op_shapes)
if self.op == "<<<":
if self.op == "<<":
if b_sign:
extra = 2**(b_bits - 1) - 1
extra = 2 ** (b_bits - 1) - 1
else:
extra = 2**b_bits - 1
extra = 2 ** (b_bits) - 1
return a_bits + extra, a_sign
if self.op == ">>>":
if self.op == ">>":
if b_sign:
extra = 2**(b_bits - 1)
extra = 2 ** (b_bits - 1)
else:
extra = 0
return a_bits + extra, a_sign