(MUL x (MOVDconst [1])) => x
(MUL x (MOVDconst [c])) && isPowerOfTwo64(c) => (SLLconst [log64(c)] x)
(MUL x (MOVDconst [c])) && isPowerOfTwo64(c-1) && c >= 3 => (ADDshiftLL x x [log64(c-1)])
(MUL x (MOVDconst [c])) && isPowerOfTwo64(c+1) && c >= 7 => (ADDshiftLL (NEG <x.Type> x) x [log64(c+1)])
(MUL x (MOVDconst [c])) && c%3 == 0 && isPowerOfTwo64(c/3) => (SLLconst [log64(c/3)] (ADDshiftLL <x.Type> x x [1]))

		v.AddArg2(a, x)
		return true
	}
	// match: (MADD a x (MOVDconst [c]))
	// cond: isPowerOfTwo64(c)
	// result: (ADDshiftLL a x [log64(c)])
	for {
		a := v_0
		x := v_1
		if v_2.Op != OpARM64MOVDconst {
			break
		}
		c := auxIntToInt64(v_2.AuxInt)
		if !(isPowerOfTwo64(c)) {
			break
		}
		v.reset(OpARM64ADDshiftLL)
		v.AuxInt = int64ToAuxInt(log64(c))

(Mul16 <t> n (Const16 [c])) && isPowerOfTwo16(c) => (Lsh16x64 <t> n (Const64 <typ.UInt64> [log16(c)]))
(Mul32 <t> n (Const32 [c])) && isPowerOfTwo32(c) => (Lsh32x64 <t> n (Const64 <typ.UInt64> [log32(c)]))
(Mul64 <t> n (Const64 [c])) && isPowerOfTwo64(c) => (Lsh64x64 <t> n (Const64 <typ.UInt64> [log64(c)]))
(Mul8  <t> n (Const8  [c])) && t.IsSigned() && isPowerOfTwo8(-c)  => (Neg8  (Lsh8x64  <t> n (Const64 <typ.UInt64> [log8(-c)])))

	return n > 0 && n&(n-1) == 0
}
func isPowerOfTwo16(n int16) bool {
	return n > 0 && n&(n-1) == 0
}
func isPowerOfTwo32(n int32) bool {
	return n > 0 && n&(n-1) == 0
}
func isPowerOfTwo64(n int64) bool {
	return n > 0 && n&(n-1) == 0
}

// isUint64PowerOfTwo reports whether uint64(n) is a power of 2.
func isUint64PowerOfTwo(in int64) bool {
	n := uint64(in)
	return n > 0 && n&(n-1) == 0

		return true
	}
	// match: (Div64 n (Const64 [c]))
	// cond: isNonNegative(n) && isPowerOfTwo64(c)
	// result: (Rsh64Ux64 n (Const64 <typ.UInt64> [log64(c)]))
	for {
		n := v_0
		if v_1.Op != OpConst64 {
			break
		}
		c := auxIntToInt64(v_1.AuxInt)
		if !(isNonNegative(n) && isPowerOfTwo64(c)) {
			break
		}
		v.reset(OpRsh64Ux64)
		v0 := b.NewValue0(v.Pos, OpConst64, typ.UInt64)