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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 .. import types, builtins
from .. import types, builtins, asttyped
class CastMonomorphizer(algorithm.Visitor):
def __init__(self, engine):
@ -20,5 +20,12 @@ class CastMonomorphizer(algorithm.Visitor):
if (not types.is_var(typ["width"]) and
builtins.is_int(node.args[0].type) and
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)