timeout.LogSuccess(UTCNow().Sub(start))
	return LockContext{ctx: newCtx, cancel: cancel}, nil
}

// Unlock - block until write lock is released.
func (di *distLockInstance) Unlock(lc LockContext) {
	if lc.cancel != nil {
		lc.cancel()
	}
	di.rwMutex.Unlock(lc.ctx)
}

// RLock - block until read lock is taken or timeout has occurred.

func diffBundles(a, b []byte) string {
	var block *pem.Block

	aBlocks := []*pem.Block{}
	for {
		block, a = pem.Decode(a)
		if block == nil {
			break
		}
		aBlocks = append(aBlocks, block)
	}
	sort.Slice(aBlocks, func(i, j int) bool {
		if aBlocks[i].Type < aBlocks[j].Type {
			return true
		} else if aBlocks[i].Type == aBlocks[j].Type {
			comp := bytes.Compare(aBlocks[i].Bytes, aBlocks[j].Bytes)

)

// fuse simplifies control flow by joining basic blocks.
func fuse(f *Func, typ fuseType) {
	for changed := true; changed; {
		changed = false
		// Be sure to avoid quadratic behavior in fuseBlockPlain. See issue 13554.
		// Previously this was dealt with using backwards iteration, now fuseBlockPlain
		// handles large runs of blocks.
		for i := len(f.Blocks) - 1; i >= 0; i-- {
			b := f.Blocks[i]
			if typ&fuseTypeIf != 0 {

)

type SparseTreeNode struct {
	child   *Block
	sibling *Block
	parent  *Block

	// Every block has 6 numbers associated with it:
	// entry-1, entry, entry+1, exit-1, and exit, exit+1.
	// entry and exit are conceptually the top of the block (phi functions)
	// entry+1 and exit-1 are conceptually the bottom of the block (ordinary defs)
	// entry-1 and exit+1 are conceptually "just before" the block (conditions flowing in)
	//

	"github.com/klauspost/reedsolomon"
)

// getDataBlockLen - get length of data blocks from encoded blocks.
func getDataBlockLen(enBlocks [][]byte, dataBlocks int) int {
	size := 0
	// Figure out the data block length.
	for _, block := range enBlocks[:dataBlocks] {
		size += len(block)
	}
	return size
}

// Writes all the data blocks from encoded blocks until requested
// outSize length. Provides a way to skip bytes until the offset.

// critical splits critical edges (those that go from a block with
// more than one outedge to a block with more than one inedge).
// Regalloc wants a critical-edge-free CFG so it can implement phi values.
func critical(f *Func) {
	// maps from phi arg ID to the new block created for that argument
	blocks := f.Cache.allocBlockSlice(f.NumValues())
	defer f.Cache.freeBlockSlice(blocks)
	// need to iterate over f.Blocks without range, as we might

		bid := q[n].bid
		cid := q[n].cid
		q = q[:n]

		// Add block to tour.
		blocks[bid].pos = int32(len(tour))
		tour = append(tour, bid)

		// Proceed down next child edge (if any).
		if cid == 0 {
			// This is our first visit to b. Set its depth.
			blocks[bid].depth = blocks[blocks[bid].parent].depth + 1
			// Then explore its first child.
			cid = blocks[bid].firstChild
		} else {

		}
	}
}

// A block tracks label declarations in a block and its enclosing blocks.
type block struct {
	parent *block                         // enclosing block
	lstmt  *syntax.LabeledStmt            // labeled statement to which this block belongs, or nil
	labels map[string]*syntax.LabeledStmt // allocated lazily
}

// insert records a new label declaration for the current block.

  // Now load a different block of file "a" at timestamp `now` + 1. When the
  // first block of "a" expires, this block should also be removed because it
  // also belongs to file "a".
  TF_EXPECT_OK(ReadCache(&cache, "a", 8, 1, &out));
  // Ensure that all blocks are in the cache (i.e. reads are cache hits).
  EXPECT_EQ(cache.CacheSize(), 24);
  EXPECT_EQ(calls, 3);
  TF_EXPECT_OK(ReadCache(&cache, "a", 0, 1, &out));

package ssa

import "cmd/compile/internal/base"

// tighten moves Values closer to the Blocks in which they are used.
// This can reduce the amount of register spilling required,
// if it doesn't also create more live values.
// A Value can be moved to any block that
// dominates all blocks in which it is used.
func tighten(f *Func) {
	if base.Flag.N != 0 && len(f.Blocks) < 10000 {
		// Skip the optimization in -N mode, except for huge functions.