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compiler: rein in overzealous cast monomorphization.

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This commit is contained in:
whitequark 2016-12-05 05:08:57 +00:00
parent 218720cfa7
commit f68e4ae519
1 changed files with 8 additions and 1 deletions
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9
artiq/compiler/transforms/cast_monomorphizer.py
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@ -4,7 +4,7 @@ expressions of undetermined integer type to either 32 or 64 bits.
""" """
from pythonparser import algorithm, diagnostic from pythonparser import algorithm, diagnostic
from .. import types, builtins from .. import types, builtins, asttyped
class CastMonomorphizer(algorithm.Visitor): class CastMonomorphizer(algorithm.Visitor):
def __init__(self, engine): def __init__(self, engine):
@ -20,5 +20,12 @@ class CastMonomorphizer(algorithm.Visitor):
if (not types.is_var(typ["width"]) and if (not types.is_var(typ["width"]) and
builtins.is_int(node.args[0].type) and builtins.is_int(node.args[0].type) and
types.is_var(node.args[0].type.find()["width"])): types.is_var(node.args[0].type.find()["width"])):
if isinstance(node.args[0], asttyped.BinOpT):
# Binary operations are a bit special: they can widen, and so their
# return type is indeterminate until both argument types are fully known.
# In case we first monomorphize the return type, and then some argument type,
# and argument type is wider than return type, we'll introduce a conflict.
return
node.args[0].type.unify(typ) node.args[0].type.unify(typ)