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[NFC] subgroups: clarify bs128 to uint4 conversion (#1893)

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There appears to have been some confusion over `uint_mask` during the
initial reviews of the subgroup tests.  Add a comment to clarify the
purpose of the mask.

Use a 32-bit all-ones mask (`0xffffffff`) instead of a 64-bit all-ones
mask to further clarify the intent, that is, don't delay discarding
the upper 32 bits until the assignment but mask them out immediately.

Fixes https://github.com/KhronosGroup/OpenCL-CTS/issues/1203

Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>
This commit is contained in:
Sven van Haastregt
2024-04-04 15:12:10 +02:00
committed by GitHub
parent 7f1caf4aa9
commit 48003e9d32
1 changed files with 3 additions and 2 deletions
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5
test_conformance/subgroups/subhelpers.cpp
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@@ -102,8 +102,9 @@ cl_uint4 generate_bit_mask(cl_uint subgroup_local_id,
if (mask_type == "gt") mask128.reset(pos);
}
// convert std::bitset<128> to uint4
auto const uint_mask = bs128{ static_cast<unsigned long>(-1) };
// convert std::bitset<128> to uint4.
// Use a mask to avoid std::overflow_error from to_ulong().
auto const uint_mask = bs128{ 0xffffffff };
mask.s0 = (mask128 & uint_mask).to_ulong();
mask128 >>= 32;
mask.s1 = (mask128 & uint_mask).to_ulong();