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Refine dtype logic for Power node #326

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Refine dtype logic for Power node #326

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10 changes: 8 additions & 2 deletions gem/gem.py
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Original file line number Diff line number Diff line change
Expand Up @@ -415,12 +415,18 @@ def __new__(cls, base, exponent):

# Constant folding
if isinstance(base, Zero):
dtype = numpy.result_type(base.dtype, exponent.dtype)
if isinstance(exponent, Constant):
dtype = numpy.result_type(base.dtype, exponent.dtype)
else:
dtype = base.dtype
if isinstance(exponent, Zero):
raise ValueError("cannot solve 0^0")
return Zero(dtype=dtype)
elif isinstance(exponent, Zero):
dtype = numpy.result_type(base.dtype, exponent.dtype)
if isinstance(base, Constant):
dtype = numpy.result_type(base.dtype, exponent.dtype)
else:
dtype = exponent.dtype
return Literal(1, dtype=dtype)
elif isinstance(base, Constant) and isinstance(exponent, Constant):
dtype = numpy.result_type(base.dtype, exponent.dtype)
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