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const OUTER_VEC_SIZE: usize = 10_000_000; pub fn loop_flat(v: &[u16]) -> u16 { let mut _counter = 0; for _i in 0..OUTER_VEC_SIZE { for _j in 0..60 { // not fixed: this is different iteration order from the nested benchmark. _counter += v[_j * OUTER_VEC_SIZE + _i]; } } _counter } pub fn loop_flat_fixed(v: &[u16]) -> u16 { let mut _counter = 0; for _i in 0..OUTER_VEC_SIZE { for _j in 0..60 { _counter += v[_i * OUTER_VEC_SIZE + _j]; } } _counter } pub fn loop_flat_explicit_size_assert_fixed(v: &[u16]) -> u16 { // This helps the compiler elide bounds checks when doing non-Iterator-based iteration: // if the bounds are broken, it explicitly panics early, so it shouldn't need to test // those bounds later. assert!(v.len() >= OUTER_VEC_SIZE * 60); let mut _counter = 0; for _i in 0..OUTER_VEC_SIZE { for _j in 0..60 { _counter += v[_i * OUTER_VEC_SIZE + _j]; } } _counter } pub fn loop_flat_with_iterator(v: &[u16]) -> u16 { // This helps the compiler elide bounds checks when doing non-Iterator-based iteration: // if the bounds are broken, it explicitly panics early, so it shouldn't need to test // those bounds later. assert!(v.len() >= OUTER_VEC_SIZE); let mut _counter = 0; for val in v.iter() { _counter += val; } _counter } pub fn loop_nested(v: &[Vec<u16>]) -> u16 { let mut _counter = 0; for _sequence in v.iter() { for _turn in _sequence.iter() { _counter += *_turn; } } _counter }
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