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Arm backend: Allocate buffers with alignment #13412

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Merged
merged 1 commit into from
Aug 14, 2025
Merged

Arm backend: Allocate buffers with alignment #13412

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5 changes: 3 additions & 2 deletions backends/arm/runtime/EthosUBackend.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -191,8 +191,9 @@ class EthosUBackend final : public ::executorch::runtime::BackendInterface {
// Use a temporary allocator for the intermediate tensors of the
// computation. The allocator is released in runtime/executor/method.cpp at
// the end of the execution of the Ethos-U custom delegate
char* ethosu_scratch =
static_cast<char*>(temp_allocator->allocate(handles.scratch_data_size));
// Ethos-U driver requires 16 bit alignment.
char* ethosu_scratch = static_cast<char*>(
temp_allocator->allocate(handles.scratch_data_size, 16UL));
if (ethosu_scratch == nullptr) {
ET_LOG(
Error,
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5 changes: 3 additions & 2 deletions examples/arm/executor_runner/arm_executor_runner.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -521,8 +521,9 @@ void runner_init(
ET_LOG(Info, "Setting up planned buffer %zu, size %zu.", id, buffer_size);

/* Move to it's own allocator when MemoryPlanner is in place. */
uint8_t* buffer =
reinterpret_cast<uint8_t*>(ctx.method_allocator->allocate(buffer_size));
/* Ethos-U driver requires 16 bit alignment. */
uint8_t* buffer = reinterpret_cast<uint8_t*>(
ctx.method_allocator->allocate(buffer_size, 16UL));
ET_CHECK_MSG(
buffer != nullptr,
"Could not allocate memory for memory planned buffer size %zu",
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