// modified by modload.LoadPackages.
type preload struct {
	cancel chan struct{}
	sema   chan struct{}
}

// newPreload creates a new preloader. flush must be called later to avoid
// accessing global state while it is being modified.
func newPreload() *preload {
	pre := &preload{
		cancel: make(chan struct{}),
		sema:   make(chan struct{}, preloadWorkerCount),
	}

				goto badloop
			}

			// TODO: sort by distance, pick the closest ones?
			for _, live := range s.live[b.ID] {
				if live.dist >= unlikelyDistance {
					// Don't preload anything live after the loop.
					continue
				}
				vid := live.ID
				vi := &s.values[vid]
				if vi.regs != 0 {
					continue
				}
				if vi.rematerializeable {
					continue
				}

(ORload    [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(int64(off1)+int64(off2)) => (ORload    [off1+off2] {sym} x ptr mem)
(ORWload   [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(int64(off1)+int64(off2)) => (ORWload   [off1+off2] {sym} x ptr mem)

	}
	if err != nil {
		t.Fatalf("build error: %v", err)
	}
}

func emitFile(t *testing.T, dst, src string) {
	payload, err := os.ReadFile(src)
	if err != nil {
		t.Fatalf("error reading %q: %v", src, err)
	}
	if err := os.WriteFile(dst, payload, 0666); err != nil {
		t.Fatalf("writing %q: %v", dst, err)
	}
}

const mainPkgPath = "prog"

	// packages.
	Tidy bool

	// TidyDiff, if true, causes tidy not to modify go.mod or go.sum but
	// instead print the necessary changes as a unified diff. It exits
	// with a non-zero code if the diff is not empty.
	TidyDiff bool

	// TidyCompatibleVersion is the oldest Go version that must be able to
	// reproducibly reload the requested packages.
	//

not reloading local variables from shared memory.
For example, a compiler must not discard <code>i</code> and reload it
a second time from <code>*p</code> in this program:
</p>

<pre>
i := *p
if i &lt; 0 || i &gt;= len(funcs) {
	panic("invalid function index")
}
... complex code ...
// compiler must NOT reload i = *p here
funcs[i]()
</pre>

<p>

					enqueue(r, nextPruning)
				}
			}
		})
	}

	mustHaveGoRoot(roots)
	for _, m := range roots {
		enqueue(m, pruning)
	}
	<-loadQueue.Idle()

	// Reload any dependencies of the main modules which are not
	// at their selected versions at workspace mode, because the
	// requirements don't accurately reflect the transitive imports.
	if pruning == workspace {

					// of non-roots don't matter because they're either always unpruned or
					// always pruned out.
					//
					// At any rate, it shouldn't cost much to reload the module graph one
					// last time and confirm that it is stable.
					rootsDirty = true
				}
			}
		}
		if rootsDirty {
			if cfg.BuildV {

		{name: "ORQload", argLength: 3, reg: gp21load, asm: "ORQ", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
		{name: "ORLload", argLength: 3, reg: gp21load, asm: "ORL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},

		{name: "ANDLload", argLength: 3, reg: gp21load, asm: "ANDL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},  // arg0 & tmp, tmp loaded from  arg1+auxint+aux, arg2 = mem
		{name: "ORLload", argLength: 3, reg: gp21load, asm: "ORL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},    // arg0 | tmp, tmp loaded from  arg1+auxint+aux, arg2 = mem