frame.lr = 0
	} else if flag&abi.FuncFlagSPWrite != 0 && (!innermost || u.flags&(unwindPrintErrors|unwindSilentErrors) != 0) {
		// The function we are in does a write to SP that we don't know
		// how to encode in the spdelta table. Examples include context
		// switch routines like runtime.gogo but also any code that switches
		// to the g0 stack to run host C code.
		// We can't reliably unwind the SP (we might not even be on

		before int32
		i      int32
		after  int32
	}
	x.before = magic32
	x.after = magic32
	var j int32
	for delta := int32(1); delta+delta > delta; delta += delta {
		k := SwapInt32(&x.i, delta)
		if x.i != delta || k != j {
			t.Fatalf("delta=%d i=%d j=%d k=%d", delta, x.i, j, k)
		}
		j = delta
	}
	if x.before != magic32 || x.after != magic32 {

    // CHECK: [[ONE_MINUS_BETA2:%.*]] = "tf.Sub"([[ONE]], [[BETA2]])
    // CHECK: [[GRAD_SQUARE:%.*]] = "tf.Square"([[GRAD]])
    // CHECK: [[V_DELTA:%.*]] = "tf.Mul"([[ONE_MINUS_BETA2]], [[GRAD_SQUARE]])
    // CHECK: [[NEW_V:%.*]] = "tf.AddV2"([[BETA2_OLD_V]], [[V_DELTA]])
    // CHECK: [[ALPHA_NEW_M:%.*]] = "tf.Mul"([[ALPHA]], [[NEW_M]])
    // CHECK: [[SQRT_NEW_V:%.*]] = "tf.Sqrt"([[NEW_V]])

		if newSec := notMonoTime.Unix(); newSec != sec+i && newSec+UnixToInternal != maxInt64 {
			t.Fatalf("time ext: %d overflows with positive delta, overflow threshold: %d", newSec, maxInt64)
		}
	}

	// Test it with negative delta.
	maxInt64 = -maxInt64
	notMonoTime = NotMonoNegativeTime
	for i := int64(0); i > -100; i-- {
		sec := notMonoTime.Unix()
		notMonoTime = notMonoTime.Add(Duration(i * 1e9))

	now := nanotime()
	delta := now - gcController.markStartTime
	if delta <= 0 {
		return true
	}
	p := getg().m.p.ptr()
	selfTime := p.gcFractionalMarkTime + (now - p.gcMarkWorkerStartTime)
	// Add some slack to the utilization goal so that the
	// fractional worker isn't behind again the instant it exits.
	return float64(selfTime)/float64(delta) > 1.2*gcController.fractionalUtilizationGoal
}

	// classifying a single trigger as having multiple reasons.
	Reason ReasonStats

	// Delta defines the resources that were added or removed as part of this push request.
	// This is set only on requests from the client which change the set of resources they (un)subscribe from.
	Delta ResourceDelta
}

type ResourceDelta = xds.ResourceDelta

type ReasonStats map[TriggerReason]int

// is the 100th year, and the missed missed leap year is the 400th year.
// So we'd prefer instead to print a calendar for 2001-2400 and reuse it
// for 2401-2800.
//
// Finally, it's convenient if the delta between the Unix epoch and
// long-ago epoch is representable by an int64 constant.
//
// These three considerations—choose an epoch as early as possible, that

// iterations by the caller to be almost free.
//
// It is important to know that the set representation used for
// startState, endState, and merges can share data for two sets where
// one is a small delta from the other.  Doing this does require a
// little care in how sets are updated, both in mergePredecessors, and
// using its result.