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compiler: Memoise unbounded #3056

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6 changes: 4 additions & 2 deletions devito/ir/support/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@

from devito.finite_differences.differentiable import IndexDerivative, IndexSum
from devito.symbolics import retrieve_indexed, search
from devito.tools import DefaultOrderedDict, as_tuple, filter_sorted, split
from devito.tools import DefaultOrderedDict, as_tuple, filter_sorted, memoized_func, split
from devito.types import (
Dimension, DimensionTuple, Indirection, ModuloDimension, StencilDimension, TensorMove
)
Expand Down Expand Up @@ -264,6 +264,7 @@ def bounded(expr):
return dims - expr.free_symbols


@memoized_func(scope='build')
def unbounded(expr):
"""
Retrieve all unbounded Dimensions in `expr`.
Expand All @@ -273,7 +274,8 @@ def unbounded(expr):
bound = set().union(*[i.dimensions for i in search(expr, IndexDerivative)])
sdims = search(expr, StencilDimension, mode='unique', deep=True)

return sdims - bound
# Immutable, as the cached result is shared across callers
return frozenset(sdims - bound)


Extrema = namedtuple('Extrema', 'm M')
Expand Down
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