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InterferenceGraph

wave_compiler::regalloc::interference

Struct InterferenceGraph 

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pub struct InterferenceGraph {
    pub adj: HashMap<VReg, HashSet<VReg>>,
    pub moves: Vec<(VReg, VReg)>,
    pub ranges: HashMap<VReg, LiveRange>,
}
Expand description

Interference graph for register allocation.

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§adj: HashMap<VReg, HashSet<VReg>>

Adjacency sets: for each VReg, the set of interfering VRegs.

§moves: Vec<(VReg, VReg)>

Move pairs (dest, src) for coalescing.

§ranges: HashMap<VReg, LiveRange>

Live ranges for each VReg.

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impl InterferenceGraph

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pub fn build(instructions: &[LirInst]) -> Self

Build the interference graph from LIR instructions.

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pub fn build_with_params(instructions: &[LirInst], num_params: u32) -> Self

Build the interference graph, extending param VReg live ranges to start at 0.

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pub fn degree(&self, vreg: VReg) -> usize

Returns the degree (number of neighbors) of a VReg.

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pub fn interferes(&self, a: VReg, b: VReg) -> bool

Returns true if two VRegs interfere.

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pub fn nodes(&self) -> Vec<VReg>

Returns all VRegs in the graph.

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