w.tmpHash64 = contentHash64(s)
	w.Bytes(w.tmpHash64[:])
}

func (w *writer) Hash(s *LSym) {
	if !s.ContentAddressable() {
		panic("Hash of non-content-addressable symbol")
	}
	w.tmpHash = w.contentHash(s)
	w.Bytes(w.tmpHash[:])
}

// contentHashSection returns a mnemonic for s's section.
// The goal is to prevent content-addressability from moving symbols between sections.

	top := tophash(hash)

	var insertb *bmap
	var inserti uintptr
	var insertk unsafe.Pointer

bucketloop:
	for {
		for i := uintptr(0); i < abi.MapBucketCount; i++ {
			if b.tophash[i] != top {
				if isEmpty(b.tophash[i]) && insertb == nil {
					insertb = b
					inserti = i
				}
				if b.tophash[i] == emptyRest {
					break bucketloop
				}

			} else {
				memclrNoHeapPointers(e, t.Elem.Size_)
			}
			b.tophash[i] = emptyOne
			// If the bucket now ends in a bunch of emptyOne states,
			// change those to emptyRest states.
			if i == abi.MapBucketCount-1 {
				if b.overflow(t) != nil && b.overflow(t).tophash[0] != emptyRest {
					goto notLast
				}
			} else {
				if b.tophash[i+1] != emptyRest {
					goto notLast
				}
			}
			for {

			} else {
				memclrNoHeapPointers(e, t.Elem.Size_)
			}
			b.tophash[i] = emptyOne
			// If the bucket now ends in a bunch of emptyOne states,
			// change those to emptyRest states.
			if i == abi.MapBucketCount-1 {
				if b.overflow(t) != nil && b.overflow(t).tophash[0] != emptyRest {
					goto notLast
				}
			} else {
				if b.tophash[i+1] != emptyRest {
					goto notLast
				}
			}
			for {

				// bit of tophash to decide which way NaNs go.
				// NOTE: this case is why we need two evacuate tophash
				// values, evacuatedX and evacuatedY, that differ in
				// their low bit.
				if checkBucket>>(it.B-1) != uintptr(b.tophash[offi]&1) {
					continue
				}
			}
		}
		if (b.tophash[offi] != evacuatedX && b.tophash[offi] != evacuatedY) ||

	testbase := filepath.Join("testdata", base) + "." + tag
	tmpbase := filepath.Join("testdata", "test-"+base+"."+tag)

	// Use a temporary directory unless -f is specified
	if !*force {
		tmpdir := t.TempDir()
		tmpbase = filepath.Join(tmpdir, "test-"+base+"."+tag)
		if *verbose {
			fmt.Printf("Tempdir is %s\n", tmpdir)
		}
	}
	exe := tmpbase

	runGoArgs := []string{"build", "-o", exe, "-gcflags=all=" + gcflags}

			"pcvalueCacheKey",
			"rand32",
			"readUnaligned32",
			"readUnaligned64",
			"releasem",
			"roundupsize",
			"stackmapdata",
			"stringStructOf",
			"subtract1",
			"subtractb",
			"tophash",
			"(*bmap).keys",
			"(*bmap).overflow",
			"(*waitq).enqueue",
			"funcInfo.entry",

			// GC-related ones
			"cgoInRange",
			"gclinkptr.ptr",
			"guintptr.ptr",
			"heapBitsSlice",

			for i := 0; i < abi.MapBucketCount; i++ {
				if b.tophash[i] != emptyRest {
					n++
				}
			}
		}
		k := 0
		for b := b0; b != nil; b = b.overflow(t) {
			for i := 0; i < abi.MapBucketCount; i++ {
				if k < n && b.tophash[i] == emptyRest {
					panic("early emptyRest")
				}
				if k >= n && b.tophash[i] != emptyRest {
					panic("late non-emptyRest")
				}