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Fix some comments

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Richard Feldman 2023-09-11 14:35:27 -04:00
parent cb453aa222
commit 3f529edbaf
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1 changed files with 4 additions and 4 deletions
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8
crates/compiler/parse/src/src64.rs
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@ -267,17 +267,17 @@ unsafe fn allocate_and_pad_with_newlines(arena: &Bump, capacity: usize) -> Optio
// we should be able to prefetch the others in the loop with enough time before the tokenizer arrives there. // we should be able to prefetch the others in the loop with enough time before the tokenizer arrives there.
} }
// Safety: `contents` has a length of `capacity`, which has been rounded up to a multiple of 64. // Safety: `buf_ptr` has a length of `capacity`, which has been rounded up to a multiple of 64.
unsafe { fill_last_64_bytes_with_newlines(buf_ptr, capacity) }; unsafe { fill_last_64_bytes_with_newlines(buf_ptr, capacity) };
Some(buf_ptr) Some(buf_ptr)
} }
/// This is branchless so there can't be mispredictions. We know the slice's length is a multiple of 64, /// This is branchless so there can't be mispredictions. We know the buffer's length is a multiple of 64,
/// so we can just always do four SIMD writes and call it a day. (Eight if we don't have SIMD.) /// so we can just always do four SIMD writes and call it a day. (Eight if we don't have SIMD.)
/// ///
/// Safety: this slice must have an alignment of at least 64, /// Safety: this pointer must have an alignment of at least 64,
/// and its length must be both at least 64 and also a multiple of 64. /// and the length must be both at least 64 and also a multiple of 64.
unsafe fn fill_last_64_bytes_with_newlines(ptr: NonNull<u8>, len: usize) { unsafe fn fill_last_64_bytes_with_newlines(ptr: NonNull<u8>, len: usize) {
debug_assert_eq!( debug_assert_eq!(
ptr.as_ptr() as usize % 16, ptr.as_ptr() as usize % 16,