// split up by the size of the execution queues.
// matchPool[i] machines have queue size matchSize[i].
// On a 64-bit system each queue entry is 16 bytes,
// so matchPool[0] has 16*2*128 = 4kB queues, etc.
// The final matchPool is a catch-all for very large queues.
var (
	matchSize = [...]int{128, 512, 2048, 16384, 0}
	matchPool [len(matchSize)]sync.Pool
)

// get returns a machine to use for matching re.