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better uniform lane range distribution when count / lanes is not cleanly divisible; plug in source file path gathering

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This commit is contained in:
Ryan Fleury
2025-08-18 12:01:55 -07:00
parent d52b6d7bca
commit 34cb8ded2c
2 changed files with 17 additions and 16 deletions
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src/base/base_thread_context.c
+7 -4
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@@ -92,11 +92,14 @@ tctx_lane_barrier_wait(void)
internal Rng1U64
tctx_lane_idx_range_from_count(U64 count)
{
U64 idxes_per_lane = (count + lane_count()-1) / lane_count();
U64 lane_base_idx = lane_idx()*idxes_per_lane;
U64 lane_opl_idx = lane_base_idx + idxes_per_lane;
U64 main_idxes_per_lane = count/lane_count();
U64 leftover_idxes_count = count - main_idxes_per_lane*lane_count();
U64 leftover_idxes_before_this_lane_count = Min(lane_idx(), leftover_idxes_count);
U64 lane_base_idx = lane_idx()*main_idxes_per_lane + leftover_idxes_before_this_lane_count;
U64 lane_base_idx__clamped = Min(lane_base_idx, count);
U64 lane_opl_idx = lane_base_idx__clamped + main_idxes_per_lane + ((lane_idx() < leftover_idxes_count) ? 1 : 0);
U64 lane_opl_idx__clamped = Min(lane_opl_idx, count);
Rng1U64 result = r1u64(lane_base_idx, lane_opl_idx__clamped);
Rng1U64 result = r1u64(lane_base_idx__clamped, lane_opl_idx__clamped);
return result;
}