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33 lines
754 B
33 lines
754 B
import type { Loc } from "./ir/loc"
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import type { SSA } from "./ir/ssa"
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export type LivenessInfo = Array<Set<Loc>>
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export const liveness = (block: Array<SSA>): LivenessInfo => {
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const info: LivenessInfo = []
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for (let i = block.length - 1; i >= 0; --i) {
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const insn = block[i]
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const last = info[i + 1] || new Set()
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info[i] = new Set()
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if (typeof insn.source !== "number") {
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info[i].add(insn.source)
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}
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if ("source1" in insn && typeof insn.source1 !== "number") {
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info[i].add(insn.source1)
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}
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last.forEach(loc => {
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if (loc === insn.dest) {
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return
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}
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info[i].add(loc)
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})
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}
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return info
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}
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