(OffPtr [off] ptr) => (ADD (MOVDconst <typ.Int64> [off]) ptr)
(MOVDaddr {sym} [n] p:(ADD x y)) && sym == nil && n == 0 => p
(MOVDaddr {sym} [n] ptr) && sym == nil && n == 0 && (ptr.Op == OpArgIntReg || ptr.Op == OpPhi) => ptr

// TODO: optimize these cases?
(Ctz32NonZero ...) => (Ctz32 ...)
(Ctz64NonZero ...) => (Ctz64 ...)

(Ctz64 x) && buildcfg.GOPPC64<=8 => (POPCNTD (ANDN <typ.Int64> (ADDconst <typ.Int64> [-1] x) x))

// phi functions, and instructions with a no-pos position
// are examples of instructions that can cause churn.
func (s *State) DebugFriendlySetPosFrom(v *ssa.Value) {
	switch v.Op {
	case ssa.OpPhi, ssa.OpCopy, ssa.OpLoadReg, ssa.OpStoreReg:
		// These are not statements
		s.SetPos(v.Pos.WithNotStmt())
	default:
		p := v.Pos
		if p != src.NoXPos {
			// If the position is defined, update the position.

		return true
	}
	// match: (MOVDaddr {sym} [n] ptr)
	// cond: sym == nil && n == 0 && (ptr.Op == OpArgIntReg || ptr.Op == OpPhi)
	// result: ptr
	for {
		n := auxIntToInt32(v.AuxInt)
		sym := auxToSym(v.Aux)
		ptr := v_0
		if !(sym == nil && n == 0 && (ptr.Op == OpArgIntReg || ptr.Op == OpPhi)) {
			break
		}
		v.copyOf(ptr)
		return true
	}
	return false
}

		return rewriteValuegeneric_OpOr32(v)
	case OpOr64:
		return rewriteValuegeneric_OpOr64(v)
	case OpOr8:
		return rewriteValuegeneric_OpOr8(v)
	case OpOrB:
		return rewriteValuegeneric_OpOrB(v)
	case OpPhi:
		return rewriteValuegeneric_OpPhi(v)
	case OpPtrIndex:
		return rewriteValuegeneric_OpPtrIndex(v)
	case OpRotateLeft16:
		return rewriteValuegeneric_OpRotateLeft16(v)
	case OpRotateLeft32:

	OpRotateLeft8
	OpSqrt
	OpSqrt32
	OpFloor
	OpCeil
	OpTrunc
	OpRound
	OpRoundToEven
	OpAbs
	OpCopysign
	OpMin64F
	OpMin32F
	OpMax64F
	OpMax32F
	OpFMA
	OpPhi
	OpCopy
	OpConvert
	OpConstBool
	OpConstString
	OpConstNil
	OpConst8
	OpConst16
	OpConst32
	OpConst64
	OpConst32F
	OpConst64F
	OpConstInterface
	OpConstSlice