A "high-level" language for the Gameboy
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import { expect } from "chai"
import { edgeConnects } from "../lib/data/graph"
import { Loc } from "../lib/ir/loc"
import type { AbsInsn2 } from "../lib/ir/insn"
import { allocateRegisters, interference, liveness } from "../lib/regalloc"
import { R8 } from "../lib/sm83/cpu"
describe("liveness", () => {
it("computes liveness", () => {
const x = [0, 1, 2].map(i => Loc.vari("x" + i))
const y = [0, 1].map(i => Loc.vari("y" + i))
const block: Array<AbsInsn2> = [
{ type: "copy", dest: x[0], source: 1 },
{ type: "unary", dest: x[1], source: x[0], op: "add" },
{ type: "unary", dest: x[2], source: x[1], op: "add" },
{ type: "unary", dest: y[0], source: x[0], op: "add" },
{ type: "unary", dest: y[1], source: y[0], op: "add" },
]
const info = liveness(block)
expect(info[0]).to.deep.equal(new Set())
expect(info[1]).to.deep.equal(new Set([x[0]]))
expect(info[2]).to.deep.equal(new Set([x[0], x[1]]))
expect(info[3]).to.deep.equal(new Set([x[0], x[1], x[2]]))
expect(info[4]).to.deep.equal(new Set([y[0], x[2]]))
})
})
describe("interference", () => {
it("computes interference", () => {
const block: Array<AbsInsn2> = [
{ type: "copy", dest: Loc.vari("a"), source: 7 },
{ type: "copy", dest: Loc.vari("b"), source: 3 },
{ type: "copy", dest: Loc.vari("x"), source: Loc.vari("a") },
]
const info = liveness(block)
const g = interference(block, info)
expect(edgeConnects(g, "a", "b")).to.be.true
})
})
describe("allocateRegisters", () => {
it("allocates registers", () => {
const block: Array<AbsInsn2> = [
{ type: "copy", dest: Loc.vari("a"), source: 7 },
{ type: "copy", dest: Loc.vari("b"), source: 3 },
{ type: "copy", dest: Loc.vari("x"), source: Loc.vari("a") }
]
const alloc = allocateRegisters(block, Object.values(R8))
expect(alloc.a).to.equal("A")
expect(alloc.b).to.equal("B")
expect(alloc.x).to.equal("A")
})
})