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Fixes for stricter compilers #1703

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Merged
rapids-bot merged 6 commits into from
Feb 7, 2026
Merged

Fixes for stricter compilers #1703

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139875b
Fixes for stricter compilers
maxwbuckley Jan 14, 2026
9827f5a
Merge branch 'main' into patch-6
mythrocks Jan 14, 2026
ec37392
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mythrocks Jan 15, 2026
93e453d
Merge branch 'main' into patch-6
mythrocks Jan 15, 2026
8db9f00
Merge branch 'main' into patch-6
cjnolet Jan 30, 2026
e5263f4
Merge branch 'main' into patch-6
cjnolet Feb 7, 2026
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13 changes: 6 additions & 7 deletions cpp/src/neighbors/detail/cagra/device_common.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -76,11 +76,11 @@ template <typename T>
RAFT_DEVICE_INLINE_FUNCTION auto team_sum(T x, uint32_t team_size_bitshift) -> T
{
switch (team_size_bitshift) {
case 5: x += raft::shfl_xor(x, 16);
case 4: x += raft::shfl_xor(x, 8);
case 3: x += raft::shfl_xor(x, 4);
case 2: x += raft::shfl_xor(x, 2);
case 1: x += raft::shfl_xor(x, 1);
case 5: x += raft::shfl_xor(x, 16); [[fallthrough]];
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@mythrocks mythrocks Jan 14, 2026

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👍

case 4: x += raft::shfl_xor(x, 8); [[fallthrough]];
case 3: x += raft::shfl_xor(x, 4); [[fallthrough]];
case 2: x += raft::shfl_xor(x, 2); [[fallthrough]];
case 1: x += raft::shfl_xor(x, 1); [[fallthrough]];
default: return x;
}
}
Expand All @@ -106,7 +106,6 @@ RAFT_DEVICE_INLINE_FUNCTION void compute_distance_to_random_nodes(
{
const auto team_size_bits = dataset_desc.team_size_bitshift_from_smem();
const auto max_i = raft::round_up_safe<uint32_t>(num_pickup, warp_size >> team_size_bits);
const auto compute_distance = dataset_desc.compute_distance_impl;

for (uint32_t i = threadIdx.x >> team_size_bits; i < max_i; i += (blockDim.x >> team_size_bits)) {
const bool valid_i = (i < num_pickup);
Expand All @@ -115,7 +114,7 @@ RAFT_DEVICE_INLINE_FUNCTION void compute_distance_to_random_nodes(
DistanceT best_norm2_team_local = raft::upper_bound<DistanceT>();
for (uint32_t j = 0; j < num_distilation; j++) {
// Select a node randomly and compute the distance to it
IndexT seed_index;
IndexT seed_index = 0;
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@mythrocks mythrocks Jan 14, 2026 •
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I'm not completely convinced that there is a problem here. seed_index's uninitialized value isn't read.

But this does indicate that this can be tightened up.

if (valid_i) {
// uint32_t gid = i + (num_pickup * (j + (num_distilation * block_id)));
uint32_t gid = block_id + (num_blocks * (i + (num_pickup * j)));
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