(CMPBconst a:(ANDLconst [c] x) [0]) && a.Uses == 1 => (TESTBconst [int8(c)] x)

// Convert TESTx to TESTxconst if possible.
(TESTQ (MOVQconst [c]) x) && is32Bit(c) => (TESTQconst [int32(c)] x)
(TESTL (MOVLconst [c]) x) => (TESTLconst [c] x)
(TESTW (MOVLconst [c]) x) => (TESTWconst [int16(c)] x)
(TESTB (MOVLconst [c]) x) => (TESTBconst [int8(c)] x)

// TEST %reg,%reg is shorter than CMP

		{name: "TESTWconst", argLength: 1, reg: gp1flags, asm: "TESTW", typ: "Flags", aux: "Int16"}, // (arg0 & auxint) compare to 0
		{name: "TESTBconst", argLength: 1, reg: gp1flags, asm: "TESTB", typ: "Flags", aux: "Int8"},  // (arg0 & auxint) compare to 0

		{name: "TESTLconst", argLength: 1, reg: gp1flags, asm: "TESTL", typ: "Flags", aux: "Int32"},
		{name: "TESTWconst", argLength: 1, reg: gp1flags, asm: "TESTW", typ: "Flags", aux: "Int16"},
		{name: "TESTBconst", argLength: 1, reg: gp1flags, asm: "TESTB", typ: "Flags", aux: "Int8"},

		// S{HL, HR, AR}x: shift operations
		// SHL: shift left
		// SHR: shift right logical (0s are shifted in from beyond the word size)

		if !(a.Uses == 1) {
			break
		}
		v.reset(OpAMD64TESTB)
		v.AddArg2(x, y)
		return true
	}
	// match: (CMPBconst a:(ANDLconst [c] x) [0])
	// cond: a.Uses == 1
	// result: (TESTBconst [int8(c)] x)
	for {
		if auxIntToInt8(v.AuxInt) != 0 {
			break
		}
		a := v_0
		if a.Op != OpAMD64ANDLconst {
			break
		}
		c := auxIntToInt32(a.AuxInt)
		x := a.Args[0]

		if !(l.Uses == 1) {
			break
		}
		v.reset(Op386TESTB)
		v.AddArg2(x, y)
		return true
	}
	// match: (CMPBconst l:(ANDLconst [c] x) [0])
	// cond: l.Uses==1
	// result: (TESTBconst [int8(c)] x)
	for {
		if auxIntToInt8(v.AuxInt) != 0 {
			break
		}
		l := v_0
		if l.Op != Op386ANDLconst {
			break
		}
		c := auxIntToInt32(l.AuxInt)
		x := l.Args[0]

		auxType: auxInt16,
		argLen:  1,
		asm:     x86.ATESTW,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 255}, // AX CX DX BX SP BP SI DI
			},
		},
	},
	{
		name:    "TESTBconst",
		auxType: auxInt8,
		argLen:  1,
		asm:     x86.ATESTB,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 255}, // AX CX DX BX SP BP SI DI
			},
		},
	},
	{