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compiler.iodelay: always fully fold SToMU and MUToS.

This commit is contained in:
whitequark 2015-11-23 23:59:59 +08:00
parent f3da227e2d
commit 02f2763ea8
1 changed files with 8 additions and 10 deletions
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18
artiq/compiler/iodelay.py
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@ -95,10 +95,6 @@ class Conv(Expr):
def free_vars(self):
return self.operand.free_vars()
def fold(self, vars=None):
return self.__class__(self.operand.fold(vars),
ref_period=self.ref_period)
class MUToS(Conv):
def __str__(self):
return "mu->s({})".format(self.operand)
@ -107,10 +103,11 @@ class MUToS(Conv):
return self.operand.eval(env) * self.ref_period
def fold(self, vars=None):
if isinstance(self.operand, Const):
return Const(self.operand.value * self.ref_period)
operand = self.operand.fold(vars)
if isinstance(operand, Const):
return Const(operand.value * self.ref_period)
else:
return super().fold(vars)
return MUToS(operand, ref_period=self.ref_period)
class SToMU(Conv):
def __str__(self):
@ -120,10 +117,11 @@ class SToMU(Conv):
return self.operand.eval(env) / self.ref_period
def fold(self, vars=None):
if isinstance(self.operand, Const):
return Const(self.operand.value / self.ref_period)
operand = self.operand.fold(vars)
if isinstance(operand, Const):
return Const(operand.value / self.ref_period)
else:
return super().fold(vars)
return SToMU(operand, ref_period=self.ref_period)
class BinOp(Expr):
def __init__(self, lhs, rhs):