Struct rustc_passes::liveness::rwu_table::RWUTable

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pub(super) struct RWUTable {
    live_nodes: usize,
    vars: usize,
    words: Vec<u8>,
    live_node_words: usize,
}
Expand description

Conceptually, this is like a Vec<Vec<RWU>>. But the number of RWU’s can get very large, so it uses a more compact representation.

Fields§

§live_nodes: usize

Total number of live nodes.

§vars: usize

Total number of variables.

§words: Vec<u8>

A compressed representation of RWUs.

Each word represents 2 different RWUs packed together. Each packed RWU is stored in 4 bits: a reader bit, a writer bit, a used bit and a padding bit.

The data for each live node is contiguous and starts at a word boundary, so there might be an unused space left.

§live_node_words: usize

Number of words per each live node.

Implementations§

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impl RWUTable

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const RWU_READER: u8 = 1u8

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const RWU_WRITER: u8 = 2u8

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const RWU_USED: u8 = 4u8

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const RWU_MASK: u8 = 15u8

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const RWU_BITS: usize = 4usize

Size of packed RWU in bits.

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const WORD_BITS: usize = 8usize

Size of a word in bits.

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const WORD_RWU_COUNT: usize = 2usize

Number of packed RWUs that fit into a single word.

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pub(super) fn new(live_nodes: usize, vars: usize) -> RWUTable

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fn word_and_shift(&self, ln: LiveNode, var: Variable) -> (usize, u32)

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fn pick2_rows_mut(&mut self, a: LiveNode, b: LiveNode) -> (&mut [u8], &mut [u8])

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pub(super) fn copy(&mut self, dst: LiveNode, src: LiveNode)

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pub(super) fn union(&mut self, dst: LiveNode, src: LiveNode) -> bool

Sets dst to the union of dst and src, returns true if dst was changed.

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pub(super) fn get_reader(&self, ln: LiveNode, var: Variable) -> bool

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pub(super) fn get_writer(&self, ln: LiveNode, var: Variable) -> bool

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pub(super) fn get_used(&self, ln: LiveNode, var: Variable) -> bool

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pub(super) fn get(&self, ln: LiveNode, var: Variable) -> RWU

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pub(super) fn set(&mut self, ln: LiveNode, var: Variable, rwu: RWU)

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Size: 48 bytes