(NEG (NEG x)) => x

(CSEL [cc] (MOVDconst [-1]) (MOVDconst [0]) flag) => (CSETM [cc] flag)
(CSEL [cc] (MOVDconst [0]) (MOVDconst [-1]) flag) => (CSETM [arm64Negate(cc)] flag)
(CSEL [cc] x (MOVDconst [0]) flag) => (CSEL0 [cc] x flag)
(CSEL [cc] (MOVDconst [0]) y flag) => (CSEL0 [arm64Negate(cc)] y flag)
(CSEL [cc] x (ADDconst [1] a) flag) => (CSINC [cc] x a flag)

	// CRC32CX <Wd>, <Wn>, <Xm>
	{0xffe0fc00, 0x9ac05c00, CRC32CX, instArgs{arg_Wd, arg_Wn, arg_Xm}, nil},
	// CSEL <Wd>, <Wn>, <Wm>, <cond>
	{0xffe00c00, 0x1a800000, CSEL, instArgs{arg_Wd, arg_Wn, arg_Wm, arg_cond_AllowALNV_Normal}, nil},
	// CSEL <Xd>, <Xn>, <Xm>, <cond>
	{0xffe00c00, 0x9a800000, CSEL, instArgs{arg_Xd, arg_Xn, arg_Xm, arg_cond_AllowALNV_Normal}, nil},
	// DCPS1 {#<imm>}

{"Name":"CSEL","Bits":"0|0|0|1|1|0|1|0|1|0|0|Rm:5|cond:4|0|0|Rn:5|Rd:5","Arch":"32-bit variant","Syntax":"CSEL <Wd>, <Wn>, <Wm>, <cond>","Code":"","Alias":""},
{"Name":"CSEL","Bits":"1|0|0|1|1|0|1|0|1|0|0|Rm:5|cond:4|0|0|Rn:5|Rd:5","Arch":"64-bit variant","Syntax":"CSEL <Xd>, <Xn>, <Xm>, <cond>","Code":"","Alias":""},

		if p.To.Type == obj.TYPE_NONE {
			rt = REGZERO
		}
		if r == obj.REG_NONE {
			r = REGZERO
		}
		o1 |= (uint32(rf&31) << 16) | (uint32(r&31) << 5) | uint32(rt&31)

	case 18: /* csel cond,Rn,Rm,Rd; cinc/cinv/cneg cond,Rn,Rd; cset cond,Rd */
		o1 = c.oprrr(p, p.As)

		cond := SpecialOperand(p.From.Offset)