case 1:
		// No ::, nothing to do.
	case 2:
		lhs, rhs := fs[0], fs[1]
		// Found a ::, figure out how many zero blocks need to be
		// inserted.
		nblocks := strings.Count(lhs, ":") + strings.Count(rhs, ":")
		if lhs != "" {
			nblocks++
		}
		if rhs != "" {
			nblocks++
		}
		if nblocks > 7 {
			return "", fmt.Errorf("netaddr.ParseIP(%q): address too long", orig)
		}
		fs = nil

			f.LogStat("loopstats:",
				l.depth, "depth", x, "exits",
				inner, "is_inner", cf, "always_calls", l.nBlocks, "n_blocks")
		}
	}

	if f.pass != nil && f.pass.debug > 1 && len(loops) > 0 {
		fmt.Printf("Loops in %s:\n", f.Name)
		for _, l := range loops {
			fmt.Printf("%s, b=", l.LongString())
			for _, b := range f.Blocks {
				if b2l[b.ID] == l {
					fmt.Printf(" %s", b)
				}
			}
			fmt.Print("\n")
		}

func gcMarkRootPrepare() {
	assertWorldStopped()

	// Compute how many data and BSS root blocks there are.
	nBlocks := func(bytes uintptr) int {
		return int(divRoundUp(bytes, rootBlockBytes))
	}

	work.nDataRoots = 0
	work.nBSSRoots = 0

	// Scan globals.
	for _, datap := range activeModules() {
		nDataRoots := nBlocks(datap.edata - datap.data)
		if nDataRoots > work.nDataRoots {
			work.nDataRoots = nDataRoots
		}

			d := b.Preds[1].Block()

			// Find their common predecessor block (the one that branches based on wb on/off).
			// It might be a diamond pattern, or one of the blocks in the diamond pattern might
			// be missing.
			var decisionBlock *ssa.Block
			if len(c.Preds) == 1 && c.Preds[0].Block() == d {
				decisionBlock = d
			} else if len(d.Preds) == 1 && d.Preds[0].Block() == c {
				decisionBlock = c

package ssa

import (
	"cmd/internal/src"
	"fmt"
)

// Block represents a basic block in the control flow graph of a function.
type Block struct {
	// A unique identifier for the block. The system will attempt to allocate
	// these IDs densely, but no guarantees.
	ID ID

	// Source position for block's control operation
	Pos src.XPos

	// The kind of block this is.
	Kind BlockKind

	// Likely direction for branches.

	b1 = block & 0x0f0f00000f0f0000
	b2 = block & 0x0000f0f00000f0f0
	block ^= b1 ^ b2 ^ b1>>12 ^ b2<<12

	b1 = block >> 32 & 0xff00ff
	b2 = (block & 0xff00ff00)
	block ^= b1<<32 ^ b2 ^ b1<<8 ^ b2<<24

	b1 = block >> 48
	b2 = block << 48
	block ^= b1 ^ b2 ^ b1<<48 ^ b2>>48
	return block
}

// creates 16 28-bit blocks rotated according
// to the rotation schedule.

	//
	// 	P.1 locks file A.
	// 	Q.3 locks file B.
	// 	Q.3 blocks on file A.
	// 	P.2 blocks on file B. (This is erroneously reported as a deadlock.)
	// 	P.1 unlocks file A.
	// 	Q.3 unblocks and locks file A.
	// 	Q.3 unlocks files A and B.
	// 	P.2 unblocks and locks file B.
	// 	P.2 unlocks file B.
	//

	"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.

	// scheduled block.
	var succs []ID
	exit := f.newSparseSet(f.NumBlocks()) // exit blocks
	defer f.retSparseSet(exit)

	// Populate idToBlock and find exit blocks.
	for _, b := range f.Blocks {
		idToBlock[b.ID] = b
		if b.Kind == BlockExit {
			exit.add(b.ID)
		}
	}

	// Expand exit to include blocks post-dominated by exit blocks.
	for {
		changed := false
		for _, id := range exit.contents() {

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)