{name: "PubBarrier", argLength: 1, hasSideEffects: true}, // Do data barrier. arg0=memory.

	// Clobber experiment op
	{name: "Clobber", argLength: 0, typ: "Void", aux: "SymOff", symEffect: "None"}, // write an invalid pointer value to the given pointer slot of a stack variable
	{name: "ClobberReg", argLength: 0, typ: "Void"},                                // clobber a register

	// Prefetch instruction

// to the buffer space in R29.
// It clobbers R30 (the linker temp register).
// The act of CALLing gcWriteBarrier will clobber R1 (LR).
// It does not clobber any other general-purpose registers,
// but may clobber others (e.g., floating point registers).
TEXT gcWriteBarrier<>(SB),NOSPLIT,$216
	// Save the registers clobbered by the fast path.
	MOVV	R19, 208(R3)
	MOVV	R13, 216(R3)
retry:

// to the buffer space in R25.
// It clobbers R23 (the linker temp register).
// The act of CALLing gcWriteBarrier will clobber R31 (LR).
// It does not clobber any other general-purpose registers,
// but may clobber others (e.g., floating point registers).
TEXT gcWriteBarrier<>(SB),NOSPLIT,$104
	// Save the registers clobbered by the fast path.
	MOVW	R1, 100(R29)
	MOVW	R2, 104(R29)
retry:

// to the buffer space in R25.
// It clobbers condition codes.
// It does not clobber any general-purpose registers except R27,
// but may clobber others (e.g., floating point registers)
// The act of CALLing gcWriteBarrier will clobber R30 (LR).
TEXT gcWriteBarrier<>(SB),NOSPLIT,$200
	// Save the registers clobbered by the fast path.
	STP	(R0, R1), 184(RSP)
retry:
	MOVD	g_m(g), R0

// madd/msub
(ADD a l:(MUL  x y)) && l.Uses==1 && clobber(l) => (MADD a x y)
(SUB a l:(MUL  x y)) && l.Uses==1 && clobber(l) => (MSUB a x y)
(ADD a l:(MNEG x y)) && l.Uses==1 && clobber(l) => (MSUB a x y)
(SUB a l:(MNEG x y)) && l.Uses==1 && clobber(l) => (MADD a x y)

(ADD a l:(MULW  x y)) && v.Type.Size() <= 4 && l.Uses==1 && clobber(l) => (MADDW a x y)

// gcWriteBarrier does NOT follow the Go ABI. It accepts the
// number of bytes of buffer needed in R11, and returns a pointer
// to the buffer space in R11.
// It clobbers FLAGS. It does not clobber any general-purpose registers,
// but may clobber others (e.g., SSE registers).
// Typical use would be, when doing *(CX+88) = AX
//     CMPL    $0, runtime.writeBarrier(SB)
//     JEQ     dowrite

(MFVSRD (FMOVDconst [c])) => (MOVDconst [int64(math.Float64bits(c))])

(MTVSRD x:(MOVDload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (FMOVDload [off] {sym} ptr mem)
(MFVSRD x:(FMOVDload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVDload [off] {sym} ptr mem)

// Rules for MOV* or FMOV* ops determine when indexed (MOV*loadidx or MOV*storeidx)

// number of bytes of buffer needed in R29, and returns a pointer
// to the buffer space in R29.
// It clobbers condition codes.
// It does not clobber R0 through R17 (except special registers),
// but may clobber any other register, *including* R31.
TEXT gcWriteBarrier<>(SB),NOSPLIT,$120
	// The standard prologue clobbers R31.
	// We use R18, R19, and R31 as scratch registers.
retry:
	MOVD	g_m(g), R18
	MOVD	m_p(R18), R18

	}

	// x's type V is a type parameter and T is not a named type,
	// and values x' of each specific type in V's type set are
	// assignable to T.
	if Vp != nil && !hasName(T) {
		x := *x // don't clobber outer x
		ok := false
		code := IncompatibleAssign
		Vp.is(func(V *term) bool {
			if V == nil {
				return false // no specific types
			}
			x.typ = V.typ
			ok, code = x.assignableTo(check, T, cause)

	}

	// x's type V is a type parameter and T is not a named type,
	// and values x' of each specific type in V's type set are
	// assignable to T.
	if Vp != nil && !hasName(T) {
		x := *x // don't clobber outer x
		ok := false
		code := IncompatibleAssign
		Vp.is(func(V *term) bool {
			if V == nil {
				return false // no specific types
			}
			x.typ = V.typ
			ok, code = x.assignableTo(check, T, cause)