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60 lines
1.9 KiB
60 lines
1.9 KiB
import { expect } from "chai"
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import { edgeConnects } from "../lib/data/graph"
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import { Loc } from "../lib/ir/loc"
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import type { SSA } from "../lib/ir/ssa"
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import { allocateRegisters, interference, liveness } from "../lib/regalloc"
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describe("liveness", () => {
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it("computes liveness", () => {
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const x = [0, 1, 2].map(i => Loc.vari("x" + i))
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const y = [0, 1].map(i => Loc.vari("y" + i))
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const block: Array<SSA> = [
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{ dest: x[0], source: 1 },
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{ dest: x[1], source: x[0], op: "add", source1: x[0] },
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{ dest: x[2], source: x[1], op: "add", source1: x[0] },
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{ dest: y[0], source: x[0], op: "add", source1: x[1] },
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{ dest: y[1], source: y[0], op: "add", source1: x[2] },
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]
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const info = liveness(block)
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expect(info[0]).to.deep.equal(new Set())
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expect(info[1]).to.deep.equal(new Set([x[0]]))
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expect(info[2]).to.deep.equal(new Set([x[0], x[1]]))
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expect(info[3]).to.deep.equal(new Set([x[0], x[1], x[2]]))
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expect(info[4]).to.deep.equal(new Set([y[0], x[2]]))
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})
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})
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describe("interference", () => {
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it("computes interference", () => {
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const block: Array<SSA> = [
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{ dest: Loc.vari("a"), source: 7 },
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{ dest: Loc.vari("b"), source: 3 },
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{ dest: Loc.vari("x"), source: Loc.vari("a") }
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]
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const info = liveness(block)
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const g = interference(block, info)
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expect(edgeConnects(g, "a", "b")).to.be.true
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})
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})
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describe("allocateRegisters", () => {
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it("allocates registers", () => {
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const block: Array<SSA> = [
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{ dest: Loc.vari("a"), source: 7 },
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{ dest: Loc.vari("b"), source: 3 },
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{ dest: Loc.vari("x"), source: Loc.vari("a") }
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]
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const alloc = allocateRegisters(block)
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expect(alloc.a).to.equal("A")
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expect(alloc.b).to.equal("B")
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expect(alloc.x).to.equal("A")
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})
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})
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