Pq   = 0xff // both escapes: 66 0f
	Pb   = 0xfe // byte operands
	Pf2  = 0xf2 // xmm escape 1: f2 0f
	Pf3  = 0xf3 // xmm escape 2: f3 0f
	Pef3 = 0xf5 // xmm escape 2 with 16-bit prefix: 66 f3 0f
	Pq3  = 0x67 // xmm escape 3: 66 48 0f
	Pq4  = 0x68 // xmm escape 4: 66 0F 38
	Pq4w = 0x69 // Pq4 with Rex.w 66 0F 38
	Pq5  = 0x6a // xmm escape 5: F3 0F 38
	Pq5w = 0x6b // Pq5 with Rex.w F3 0F 38