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compiler: respect fetch direction #2441

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Merged
mloubout merged 1 commit into from
Aug 20, 2024
Merged

compiler: respect fetch direction #2441

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8 changes: 3 additions & 5 deletions devito/passes/clusters/asynchrony.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

from sympy import true

from devito.ir import (Forward, GuardBoundNext, WaitLock, WithLock, SyncArray,
from devito.ir import (Forward, Backward, GuardBoundNext, WaitLock, WithLock, SyncArray,
PrefetchUpdate, ReleaseLock, Queue, normalize_syncs)
from devito.passes.clusters.utils import in_critical_region, is_memcpy
from devito.symbolics import IntDiv, uxreplace
Expand Down Expand Up @@ -237,10 +237,8 @@ def _actions_from_update_memcpy(c, d, clusters, actions, sregistry):
target = e.lhs.function

fetch = e.rhs.indices[d]
if direction is Forward:
findex = fetch + 1
else:
findex = fetch - 1
fshift = {Forward: 1, Backward: -1}.get(direction, 0)
findex = fetch + fshift if fetch.find(IntDiv) else fetch._subs(pd, pd + fshift)

# If fetching into e.g. `ub[t1]` we might need to prefetch into e.g. `ub[t0]`
tindex0 = e.lhs.indices[d]
Expand Down