// act without synchronizing with a STW. See #64401.
		lock(&sched.sysmonlock)
		lock(&trace.lock)
		if gcController.heapInUse.load() != uint64(consStats.inHeap) {
			print("runtime: heapInUse=", gcController.heapInUse.load(), "\n")
			print("runtime: consistent value=", consStats.inHeap, "\n")
			throw("heapInUse and consistent stats are not equal")
		}
		if gcController.heapReleased.load() != uint64(consStats.released) {

	// So the number is already shortest if 10^(dp-nd) > 2^(exp-mantbits),
	// or equivalently log2(10)*(dp-nd) > exp-mantbits.
	// It is true if 332/100*(dp-nd) >= exp-mantbits (log2(10) > 3.32).
	minexp := flt.bias + 1 // minimum possible exponent
	if exp > minexp && 332*(d.dp-d.nd) >= 100*(exp-int(flt.mantbits)) {
		// The number is already shortest.
		return
	}

	// d = mant << (exp - mantbits)

		for x.Bit(badj) != 0 {
			x.SetBit(x, badj, 0)
			badj++
		}
		x.SetBit(x, badj, 1)
	}

	// create corresponding float
	z := new(Float).SetInt(x) // normalized
	if e := int64(z.exp) + int64(min); MinExp <= e && e <= MaxExp {
		z.exp = int32(e)
	} else {
		// this should never happen for our test cases
		panic("exponent out of range")
	}
	return z
}

func TestFromBits(t *testing.T) {

// If trunc is true, trailing non-zero bits have been omitted from the mantissa.
func atofHex(s string, flt *floatInfo, mantissa uint64, exp int, neg, trunc bool) (float64, error) {
	maxExp := 1<<flt.expbits + flt.bias - 2
	minExp := flt.bias + 1
	exp += int(flt.mantbits) // mantissa now implicitly divided by 2^mantbits.

	// Shift mantissa and exponent to bring representation into float range.

			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.committed - in.heapStats.inHeap -
					in.heapStats.inStacks - in.heapStats.inWorkBufs -
					in.heapStats.inPtrScalarBits)
			},
		},
		"/memory/classes/heap/objects:bytes": {
			deps: makeStatDepSet(heapStatsDep),

		it := *(**_type)(p)
		if it == nil {
			return
		}
		// A type known at compile time is OK since it's
		// constant. A type not known at compile time will be
		// in the heap and will not be OK.
		if inheap(uintptr(unsafe.Pointer(it))) {
			panic(errorString(msg))
		}
		p = *(*unsafe.Pointer)(add(p, goarch.PtrSize))
		if !cgoIsGoPointer(p) {
			return
		}
		if !top && !isPinned(p) {
			panic(errorString(msg))

		exp5 += exp
		fallthrough // see fallthrough above
	case 2:
		exp2 += exp
	default:
		panic("unexpected exponent base")
	}
	// exp consumed - not needed anymore

	// apply 2**exp2
	if MinExp <= exp2 && exp2 <= MaxExp {
		z.prec = prec
		z.form = finite
		z.exp = int32(exp2)
		f = z
	} else {
		err = fmt.Errorf("exponent overflow")
		return
	}

	if exp5 == 0 {

		z    string
	}{
		{"0", 0, "0"},
		{"+0", 0, "0"},
		{"-0", 0, "-0"},
		{"Inf", 1234, "+Inf"},
		{"+Inf", -1234, "+Inf"},
		{"-Inf", -1234, "-Inf"},
		{"0", MinExp, "0"},
		{"0.25", MinExp, "+0"},    // exponent underflow
		{"-0.25", MinExp, "-0"},   // exponent underflow
		{"1", MaxExp, "+Inf"},     // exponent overflow
		{"2", MaxExp - 1, "+Inf"}, // exponent overflow
		{"0.75", 1, "1.5"},
		{"0.5", 11, "1024"},

	}
}

// inheap reports whether b is a pointer into a (potentially dead) heap object.
// It returns false for pointers into mSpanManual spans.
// Non-preemptible because it is used by write barriers.
//
//go:nowritebarrier
//go:nosplit
func inheap(b uintptr) bool {
	return spanOfHeap(b) != nil
}

// inHeapOrStack is a variant of inheap that returns true for pointers

			// Free large object span to heap.

			// Count the free in the consistent, external stats.
			//
			// Do this before freeSpan, which might update heapStats' inHeap
			// value. If it does so, then metrics that subtract object footprint
			// from inHeap might overflow. See #67019.
			stats := memstats.heapStats.acquire()
			atomic.Xadd64(&stats.largeFreeCount, 1)
			atomic.Xadd64(&stats.largeFree, int64(size))