{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of buffer entries needed
		// It saves all GP registers if necessary,
		// but clobbers R31 (LR) because it's a call
		// and R23 (REGTMP).
		// Returns a pointer to a write barrier buffer in R25.

		{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of buffer entries needed
		// It saves all GP registers if necessary,
		// but clobbers R1 (LR) because it's a call
		// and R30 (REGTMP).
		// Returns a pointer to a write barrier buffer in R29.

		{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of buffer entries needed
		// It saves all GP registers if necessary,
		// but clobbers R31 (LR) because it's a call
		// and R23 (REGTMP).
		// Returns a pointer to a write barrier buffer in R25.

		c.UseFMA = false

		// Don't use Duff's device and SSE on Plan 9 AMD64.
		if arch == "amd64" {
			c.noDuffDevice = true
			c.useSSE = false
		}
	}

	if ctxt.Flag_shared {
		// LoweredWB is secretly a CALL and CALLs on 386 in
		// shared mode get rewritten by obj6.go to go through
		// the GOT, which clobbers BX.
		opcodeTable[Op386LoweredWB].reg.clobbers |= 1 << 3 // BX
	}

		{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of buffer entries needed
		// It saves all GP registers if necessary,
		// but clobbers RA (LR) because it's a call
		// and T6 (REG_TMP).
		// Returns a pointer to a write barrier buffer in X24.

		{name: "LoweredNilCheck", argLength: 2, reg: regInfo{inputs: []regMask{gp}}, nilCheck: true, faultOnNilArg0: true}, // panic if arg0 is nil. arg1=mem
		{name: "LoweredWB", argLength: 1, reg: regInfo{clobbers: callerSave, outputs: []regMask{gp}}, aux: "Int64"},        // invokes runtime.gcWriteBarrier{auxint}. arg0=mem, auxint=# of buffer entries needed. Returns a pointer to a write barrier buffer.

		{name: "InvertFlags", argLength: 1}, // reverse direction of arg0

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of buffer entries needed
		// It saves all GP registers if necessary,
		// but clobbers R14 (LR) because it's a call, and R12 which is linker trampoline scratch register.
		// Returns a pointer to a write barrier buffer in R8.

(LocalAddr <t> {sym} base mem) && t.Elem().HasPointers() => (LoweredAddr {sym} (SPanchored base mem))
(LocalAddr <t> {sym} base _)  && !t.Elem().HasPointers() => (LoweredAddr {sym} base)

// Write barrier.
(WB ...) => (LoweredWB ...)

// --- Intrinsics ---
(Sqrt ...) => (F64Sqrt ...)
(Trunc ...) => (F64Trunc ...)
(Ceil ...) => (F64Ceil ...)
(Floor ...) => (F64Floor ...)
(RoundToEven ...) => (F64Nearest ...)

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of write barrier slots
		// It saves all GP registers if necessary, but may clobber others.
		// Returns a pointer to a write barrier buffer in DI.

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of buffer entries needed
		// It preserves R0 through R17 (except special registers R1, R2, R11, R12, R13), g, and R20 and R21,
		// but may clobber anything else, including R31 (REGTMP).
		// Returns a pointer to a write barrier buffer in R29.