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[SYCL][CUDA] Fix alignment of local arguments #5113

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Merged
merged 3 commits into from
Jan 10, 2022
Merged

[SYCL][CUDA] Fix alignment of local arguments #5113

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cd86eac
[SYCL][CUDA] Fix alignment of local arguments
npmiller Dec 9, 2021
9a718f1
[SYCL][CUDA] Adjust local memory size
npmiller Dec 9, 2021
c0e5ca6
[SYCL][CUDA] Only align if necessary
npmiller Jan 3, 2022
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17 changes: 16 additions & 1 deletion sycl/plugins/cuda/pi_cuda.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -638,7 +638,22 @@ struct _pi_kernel {

void add_local_arg(size_t index, size_t size) {
size_t localOffset = this->get_local_size();
add_arg(index, sizeof(size_t), (const void *)&(localOffset), size);

// maximum required alignment is the size of the largest vector type
const size_t max_alignment = sizeof(double) * 16;

// for arguments smaller than the maximum alignment simply align to the
// size of the argument
const size_t alignment = std::min(max_alignment, size);

// align the argument
size_t alignedLocalOffset = localOffset;
if (localOffset % alignment != 0) {
alignedLocalOffset += alignment - (localOffset % alignment);
}

add_arg(index, sizeof(size_t), (const void *)&(alignedLocalOffset),
size + (alignedLocalOffset - localOffset));
}

void set_implicit_offset(size_t size, std::uint32_t *implicitOffset) {
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