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subgroups: fix for testing too large WG sizes (#1620)

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It seemed to be a typo; the comment says that it
tries to fetch local size for a subgroup count with
above max WG size, but it just used the previous
subgroup count.

The test on purpose sets a SG count to be a larger
number than the max work-items in the work group.
Given the minimum SG size is 1 WI, it means that there
can be a maximum of maximum work-group size of SGs (of
1 WI of size). Thus, if we request a number of SGs that
exceeds the local size, the query should fail as expected.
This commit is contained in:
Pekka Jääskeläinen
2024-01-30 19:13:22 +02:00
committed by GitHub
parent b5f030faa1
commit 8bb89b165c
1 changed files with 3 additions and 2 deletions
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5
test_conformance/api/test_sub_group_dispatch.cpp
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@@ -188,8 +188,9 @@ int test_sub_group_dispatch(cl_device_id deviceID, cl_context context, cl_comman
}
}
// test when input subgroup count exceeds max wg size
size_t large_sg_size = kernel_subgroup_count + 1;
// test when input subgroup count exceeds max wg size:
// there can be at most the local size of (1 WI) subgroups
size_t large_sg_size = max_local + 1;
error = clGetKernelSubGroupInfo(kernel, deviceID, CL_KERNEL_LOCAL_SIZE_FOR_SUB_GROUP_COUNT, sizeof(size_t), &large_sg_size, sizeof(ret_ndrange1d), &ret_ndrange1d, &realSize);
test_error(error, "clGetKernelSubGroupInfo failed for CL_KERNEL_LOCAL_SIZE_FOR_SUB_GROUP_COUNT");
if (ret_ndrange1d != 0)