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It has two versions, one with an upper bound, and one with a lower and upper bound. This commit removes the first one and changes the second one to take a range, because that is more concise and flexible and clearer. Also, rename it as `in_range`, which makes sense given that the bounds are specified via a Rust `Range`. Note: some of the ranges are incorrect, and will be fixed in the next commit.
Every single one has an upper bound that is one higher than it should be. - For `thread_idx_[xyz]`: indices are 0-indexed, so the maximum index is the `block_dim_[xyz]` maximum minus one. Changing `..=` to `..` fixes it. - For `block_idx_[xyz]`: likewise, but relative to `grid_dim_[xyz]`. - For `block_dim_[xyz]`: these were all one too big. Not sure why, perhaps a `..`/`..=` mix-up? - For `grid_dim_[xyz]`: likewise. (Yes, these grid maximum dimensions are all of the form 2^N-1 even though the block maximum dimensions are all of the form 2^N. I don't know why, but it's what the CUDA docs say.)
Instead call the Rust functions that have the range constraints. That way the 3d version get the same range constraints as the 1d versions. It also avoids the need for some `unsafe` blocks.
`core` has equivalents, might as well use them instead.
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LegNeato
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Nov 12, 2025
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Looks good, thanks for cleaning this up.
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@FractalFir identified that rust-cuda implements some intrinsics that are present in
core. I also fixed some nearby rough edges.