{name: "SBCSflags", argLength: 3, reg: gp2flags1flags, typ: "(UInt64,Flags)", asm: "SBCS"},                    // arg0-(arg1+borrowing), set flags.
		{name: "SUBSflags", argLength: 2, reg: gp21flags, typ: "(UInt64,Flags)", asm: "SUBS"},                         // arg0 - arg1, set flags.

(SBCSflags x y (Select1 <types.TypeFlags> (NEGSflags (NEG <typ.UInt64> (NGCzerocarry <typ.UInt64> bo))))) => (SBCSflags x y bo)
(SBCSflags x y (Select1 <types.TypeFlags> (NEGSflags (MOVDconst [0])))) => (SUBSflags x y)

// mul by constant
(MUL x (MOVDconst [-1])) => (NEG x)
(MUL _ (MOVDconst [0])) => (MOVDconst [0])
(MUL x (MOVDconst [1])) => x
(MUL x (MOVDconst [c])) && isPowerOfTwo64(c) => (SLLconst [log64(c)] x)

		}
		bo := v_2_0_0_0.Args[0]
		v.reset(OpARM64SBCSflags)
		v.AddArg3(x, y, bo)
		return true
	}
	// match: (SBCSflags x y (Select1 <types.TypeFlags> (NEGSflags (MOVDconst [0]))))
	// result: (SUBSflags x y)
	for {
		x := v_0
		y := v_1
		if v_2.Op != OpSelect1 || v_2.Type != types.TypeFlags {
			break
		}
		v_2_0 := v_2.Args[0]
		if v_2_0.Op != OpARM64NEGSflags {
			break

			outputs: []outputInfo{
				{1, 0},
				{0, 670826495}, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R19 R20 R21 R22 R23 R24 R25 R26 R30
			},
		},
	},
	{
		name:   "SUBSflags",
		argLen: 2,
		asm:    arm64.ASUBS,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 670826495}, // R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R19 R20 R21 R22 R23 R24 R25 R26 R30