func lim1(x, y, z int) {
	// Test relations between signed and unsigned limits.
	if x > 5 {
		if uint(x) > 5 { // ERROR "Proved Less64U$"
			return
		}
	}
	if y >= 0 && y < 4 {
		if uint(y) > 4 { // ERROR "Disproved Less64U$"
			return
		}
		if uint(y) < 5 { // ERROR "Proved Less64U$"
			return
		}
	}
	if z < 4 {
		if uint(z) > 4 { // Not provable without disjunctions.
			return
		}
	}
}

(Less64  ...) => (SLT  ...)
(Less32  x y) => (SLT  (SignExt32to64 x) (SignExt32to64 y))
(Less16  x y) => (SLT  (SignExt16to64 x) (SignExt16to64 y))
(Less8   x y) => (SLT  (SignExt8to64  x) (SignExt8to64  y))
(Less64U ...) => (SLTU ...)
(Less32U x y) => (SLTU (ZeroExt32to64 x) (ZeroExt32to64 y))
(Less16U x y) => (SLTU (ZeroExt16to64 x) (ZeroExt16to64 y))
(Less8U  x y) => (SLTU (ZeroExt8to64  x) (ZeroExt8to64  y))

(Less8U x y)  => (SGTU (ZeroExt8to64 y) (ZeroExt8to64 x))
(Less16U x y) => (SGTU (ZeroExt16to64 y) (ZeroExt16to64 x))
(Less32U x y) => (SGTU (ZeroExt32to64 y) (ZeroExt32to64 x))
(Less64U x y) => (SGTU y x)

(Leq8 x y)  => (XOR (MOVVconst [1]) (SGT (SignExt8to64 x) (SignExt8to64 y)))
(Leq16 x y) => (XOR (MOVVconst [1]) (SGT (SignExt16to64 x) (SignExt16to64 y)))

			v2.AuxInt = int8ToAuxInt(d - c)
			v.AddArg2(v0, v2)
			return true
		}
		break
	}
	// match: (AndB (Less64U (Const64 [c]) x) (Less64U x (Const64 [d])))
	// cond: uint64(d) >= uint64(c+1) && uint64(c+1) > uint64(c)
	// result: (Less64U (Sub64 <x.Type> x (Const64 <x.Type> [c+1])) (Const64 <x.Type> [d-c-1]))
	for {
		for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {

// unsigned integer range: ( c < x && x (<|<=) d ) -> ( x-(c+1) (<|<=) d-(c+1) )
(AndB (Less64U (Const64 [c]) x) ((Less|Leq)64U x (Const64 [d]))) && uint64(d) >= uint64(c+1) && uint64(c+1) > uint64(c) => ((Less|Leq)64U (Sub64 <x.Type> x (Const64 <x.Type> [c+1])) (Const64 <x.Type> [d-c-1]))

	{name: "Less16U", argLength: 2, typ: "Bool"},
	{name: "Less32", argLength: 2, typ: "Bool"},
	{name: "Less32U", argLength: 2, typ: "Bool"},
	{name: "Less64", argLength: 2, typ: "Bool"},
	{name: "Less64U", argLength: 2, typ: "Bool"},
	{name: "Less32F", argLength: 2, typ: "Bool"},
	{name: "Less64F", argLength: 2, typ: "Bool"},

	{name: "Leq8", argLength: 2, typ: "Bool"},  // arg0 <= arg1, signed

(Less32      x y) => (LOCGR {s390x.Less} (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Less(16|8)  x y) => (LOCGR {s390x.Less} (MOVDconst [0]) (MOVDconst [1]) (CMPW (MOV(H|B)reg x) (MOV(H|B)reg y)))
(Less64U     x y) => (LOCGR {s390x.Less} (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Less32U     x y) => (LOCGR {s390x.Less} (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))

(Less8U  x y) => (LessThanU (CMPW (ZeroExt8to32  x) (ZeroExt8to32  y)))
(Less16U x y) => (LessThanU (CMPW (ZeroExt16to32 x) (ZeroExt16to32 y)))
(Less32U x y) => (LessThanU (CMPW x y))
(Less64U x y) => (LessThanU (CMP x y))

(Leq8  x y) => (LessEqual (CMPW (SignExt8to32  x) (SignExt8to32  y)))
(Leq16 x y) => (LessEqual (CMPW (SignExt16to32 x) (SignExt16to32 y)))
(Leq32 x y) => (LessEqual (CMPW x y))

		v0.AddArg2(y, x)
		v.AddArg(v0)
		return true
	}
}
func rewriteValueLOONG64_OpLess64U(v *Value) bool {
	v_1 := v.Args[1]
	v_0 := v.Args[0]
	// match: (Less64U x y)
	// result: (SGTU y x)
	for {
		x := v_0
		y := v_1
		v.reset(OpLOONG64SGTU)
		v.AddArg2(y, x)
		return true
	}
}
func rewriteValueLOONG64_OpLess8(v *Value) bool {

	b := v.Block
	typ := &b.Func.Config.Types
	// match: (Less64U zero:(MOVDconst [0]) x)
	// result: (Neq64 zero x)
	for {
		zero := v_0
		if zero.Op != OpARM64MOVDconst || auxIntToInt64(zero.AuxInt) != 0 {
			break
		}
		x := v_1
		v.reset(OpNeq64)
		v.AddArg2(zero, x)
		return true
	}
	// match: (Less64U x (MOVDconst [1]))
	// result: (Eq64 x (MOVDconst [0]))
	for {