break
			}

			var depth int16
			if l := s.loopnest.b2l[b.ID]; l != nil {
				depth = l.depth
			}
			if depth > bestDepth {
				// Don't push the spill into a deeper loop.
				continue
			}

			// If v is in a register at the start of b, we can
			// place the spill here (after the phis).
			if len(b.Preds) == 1 {