PERF_SAMPLE_BRANCH_IND_JUMP           = 0x1000
	PERF_SAMPLE_BRANCH_CALL               = 0x2000
	PERF_SAMPLE_BRANCH_NO_FLAGS           = 0x4000
	PERF_SAMPLE_BRANCH_NO_CYCLES          = 0x8000
	PERF_SAMPLE_BRANCH_TYPE_SAVE          = 0x10000
	PERF_SAMPLE_BRANCH_HW_INDEX           = 0x20000
	PERF_SAMPLE_BRANCH_PRIV_SAVE          = 0x40000
	PERF_SAMPLE_BRANCH_MAX                = 0x100000
	PERF_BR_UNKNOWN                       = 0x0

	for {
		t := v.Type
		x := v_0
		if !(buildcfg.GOARM.Version == 5) {
			break
		}
		v.reset(OpARMXOR)
		v.Type = t
		v0 := b.NewValue0(v.Pos, OpARMSRLconst, t)
		v0.AuxInt = int32ToAuxInt(8)
		v1 := b.NewValue0(v.Pos, OpARMBICconst, t)
		v1.AuxInt = int32ToAuxInt(0xff0000)
		v2 := b.NewValue0(v.Pos, OpARMXOR, t)

	v_0 := v.Args[0]
	b := v.Block
	typ := &b.Func.Config.Types
	// match: (Ctz16 x)
	// result: (BSFL (ORLconst <typ.UInt32> [0x10000] x))
	for {
		x := v_0
		v.reset(Op386BSFL)
		v0 := b.NewValue0(v.Pos, Op386ORLconst, typ.UInt32)
		v0.AuxInt = int32ToAuxInt(0x10000)
		v0.AddArg(x)
		v.AddArg(v0)
		return true
	}
}
func rewriteValue386_OpCtz8(v *Value) bool {
	v_0 := v.Args[0]