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compiler: Tweak nofuse mode #2790

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compiler: Tweak nofuse mode #2790

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9 changes: 7 additions & 2 deletions devito/passes/clusters/misc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -135,8 +135,6 @@ def callback(self, cgroups, prefix):
# Toposort to maximize fusion
if self.toposort:
clusters = self._toposort(cgroups, prefix)
if self.toposort == 'nofuse':
return [clusters]
else:
clusters = ClusterGroup(cgroups)

Expand All @@ -146,6 +144,13 @@ def callback(self, cgroups, prefix):
g = list(group)

for maybe_fusible in self._apply_heuristics(g):
if self.toposort == 'nofuse':
# Special case: we retain the ClusterGroup to maximize the
# effectiveness of the toposort at the next stage, but we
# do not actually fuse anything
processed.append(ClusterGroup(maybe_fusible, prefix))
continue

try:
# Perform fusion
processed.append(Cluster.from_clusters(*maybe_fusible))
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