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a/boxify-tests/benches/unaligned_aligned.rs b/boxify-tests/benches/unaligned_aligned.rs new file mode 100644 index 0000000..29469a2 --- /dev/null +++ b/boxify-tests/benches/unaligned_aligned.rs @@ -0,0 +1,59 @@ +use core::mem::size_of; + +use criterion::{black_box, criterion_group, criterion_main, Criterion}; + +fn unaligned_write(array: &mut [T; SIZE], value: T) { + let array = array.as_mut_ptr(); + if size_of::() == 1 { + // in this case, we can use `ptr::write_bytes` instead of `ptr::write` + // SAFETY: we just checked that T is 1 byte, so casting to *const u8 is valid + let value_byte: *const u8 = core::ptr::addr_of!(value) as *const u8; + // also casting array to *mut u8 for alignment reasons (basically what an unaligned write does) + unsafe { core::ptr::write_bytes(array as *mut u8, *value_byte, SIZE) }; + } else { + for i in 0..SIZE { + // write the value to the array + unsafe { array.add(i).write_unaligned(value) }; + } + } +} + +fn aligned_write(array: &mut [T; SIZE], value: T) { + let array = array.as_mut_ptr(); + if size_of::() == 1 { + // in this case, we can use `ptr::write_bytes` instead of `ptr::write` + // SAFETY: we just checked that T is 1 byte, so casting to *const u8 is valid + let value_byte: *const u8 = core::ptr::addr_of!(value) as *const u8; + unsafe { core::ptr::write_bytes(array, *value_byte, SIZE) }; + } else { + for i in 0..SIZE { + // write the value to the array + unsafe { array.add(i).write(value) }; + } + } +} + +fn multibyte_writes(c: &mut Criterion) { + const SIZE: usize = 5000000; + let mut array = [0u128; SIZE / 16]; + c.bench_function("unaligned multibyte write", |b| { + b.iter(|| unaligned_write(&mut array, black_box(42u128))) + }); + c.bench_function("aligned multibyte write", |b| { + b.iter(|| aligned_write(&mut array, black_box(42u128))) + }); +} + +fn singlebyte_writes(c: &mut Criterion) { + const SIZE: usize = 5000000; + let mut array = [0u8; SIZE]; + c.bench_function("unaligned single byte write", |b| { + b.iter(|| unaligned_write(&mut array, black_box(42u8))) + }); + c.bench_function("aligned single byte write", |b| { + b.iter(|| aligned_write(&mut array, black_box(42u8))) + }); +} + +criterion_group!(benches, multibyte_writes, singlebyte_writes); +criterion_main!(benches);