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