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receive_any: Use trailing_zeros to improve performance #50

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receive_any: Use trailing_zeros to improve performance #50

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1 change: 1 addition & 0 deletions mcan/CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
Tagging in git follows a pattern: `mcan/<version>`.

## [Unreleased]
- Improve performance of RxDedicatedBuffer::receive_any (#50)

## [0.5.0] - 2024-03-04

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17 changes: 6 additions & 11 deletions mcan/src/rx_dedicated_buffers.rs
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Expand Up @@ -124,17 +124,12 @@ impl<'a, P: mcan_core::CanId, M: rx::AnyMessage> DynRxDedicatedBuffer
}

fn receive_any(&mut self) -> nb::Result<Self::Message, Infallible> {
self.memory
.iter()
.enumerate()
.filter(|&(i, _)| self.has_new_data(i))
.map(|(i, m)| (i, m.get()))
.min_by_key(|(_, m)| m.id())
.map(|(i, m)| {
self.mark_buffer_read(i);
m
})
.ok_or(nb::Error::WouldBlock)
let ndat =
(self.ndat1().read().bits() as u64) | ((self.ndat2().read().bits() as u64) << 32);
let idx = ndat.trailing_zeros() as usize;
let m = self.memory.get(idx).ok_or(nb::Error::WouldBlock)?;
self.mark_buffer_read(idx);
Ok(m.get())
}
}

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