// ----------------------- //

func LeadingZeros(n uint) int {
	// amd64/v1,amd64/v2:"BSRQ"
	// amd64/v3:"LZCNTQ", -"BSRQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	// wasm:"I64Clz"
	// ppc64x:"CNTLZD"
	return bits.LeadingZeros(n)
}

func LeadingZeros64(n uint64) int {
	// amd64/v1,amd64/v2:"BSRQ"
	// amd64/v3:"LZCNTQ", -"BSRQ"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"
	// wasm:"I64Clz"

// For GOAMD64>=3, BitLen can be calculated by OperandSize - LZCNT(x).
(BitLen64 <t> x) && buildcfg.GOAMD64 < 3 => (ADDQconst [1] (CMOVQEQ <t> (Select0 <t> (BSRQ x)) (MOVQconst <t> [-1]) (Select1 <types.TypeFlags> (BSRQ x))))
(BitLen32 x) && buildcfg.GOAMD64 <  3 => (Select0 (BSRQ (LEAQ1 <typ.UInt64> [1] (MOVLQZX <typ.UInt64> x) (MOVLQZX <typ.UInt64> x))))

	v_0 := v.Args[0]
	b := v.Block
	typ := &b.Func.Config.Types
	// match: (BitLen64 <t> x)
	// cond: buildcfg.GOAMD64 < 3
	// result: (ADDQconst [1] (CMOVQEQ <t> (Select0 <t> (BSRQ x)) (MOVQconst <t> [-1]) (Select1 <types.TypeFlags> (BSRQ x))))
	for {
		t := v.Type
		x := v_0
		if !(buildcfg.GOAMD64 < 3) {
			break
		}
		v.reset(OpAMD64ADDQconst)
		v.AuxInt = int32ToAuxInt(1)

			},
			outputs: []outputInfo{
				{0, 49135}, // AX CX DX BX BP SI DI R8 R9 R10 R11 R12 R13 R15
			},
		},
	},
	{
		name:   "BSRQ",
		argLen: 1,
		asm:    x86.ABSRQ,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 49135}, // AX CX DX BX BP SI DI R8 R9 R10 R11 R12 R13 R15
			},
			outputs: []outputInfo{
				{1, 0},