// It saves all GP registers if necessary,
		// but clobbers R14 (LR) because it's a call,
		// and also clobbers R1 as the PLT stub does.
		// Returns a pointer to a write barrier buffer in R9.
		{name: "LoweredWB", argLength: 1, reg: regInfo{clobbers: (callerSave &^ gpg) | buildReg("R14") | r1, outputs: []regMask{r9}}, clobberFlags: true, aux: "Int64"},

		// It saves all GP registers if necessary,
		// but clobbers R30 (LR) because it's a call.
		// R16 and R17 may be clobbered by linker trampoline.
		// Returns a pointer to a write barrier buffer in R25.
		{name: "LoweredWB", argLength: 1, reg: regInfo{clobbers: (callerSave &^ gpg) | buildReg("R16 R17 R30"), outputs: []regMask{buildReg("R25")}}, clobberFlags: true, aux: "Int64"},

			}

			// Dump any registers which will be clobbered
			if s.doClobber && v.Op.IsCall() {
				// clobber registers that are marked as clobber in regmask, but
				// don't clobber inputs.
				s.clobberRegs(regspec.clobbers &^ s.tmpused &^ s.nospill)
			}
			s.freeRegs(regspec.clobbers)
			s.tmpused |= regspec.clobbers

			// Pick registers for outputs.
			{

	}

	// Handle any register clobbering. Call operations, for example,
	// clobber all registers even though they don't explicitly write to
	// them.
	clobbers := uint64(opcodeTable[v.Op].reg.clobbers)
	for {
		if clobbers == 0 {
			break
		}
		reg := uint8(bits.TrailingZeros64(clobbers))
		clobbers &^= 1 << reg

		for _, slot := range locs.registers[reg] {
			if state.loggingLevel > 1 {

}

// isUnsafePoint returns whether p is an unsafe point.
func (c *ctxt0) isUnsafePoint(p *obj.Prog) bool {
	// If p explicitly uses REGTMP, it's unsafe to preempt, because the
	// preemption sequence clobbers REGTMP.
	return p.From.Reg == REGTMP || p.To.Reg == REGTMP || p.Reg == REGTMP
}

// isRestartable returns whether p is a multi-instruction sequence that,
// if preempted, can be restarted.

	VOR    T1, T1, U1H           // SAVE: U1H

	// SUB(H<H-T)            // H  = H-U1
	p256SubInternal(HH,HL,HH,HL,T1,T0)

	// if H == 0 or H^P == 0 then ret=1 else ret=0
	// clobbers T1H and T1L
	MOVD       $1, TRUE
	VSPLTISB   $0, ZER
	VOR        HL, HH, T1H
	VCMPEQUDCC ZER, T1H, T1H

	// 26 = CR6 NE
	ISEL       $26, R0, TRUE, RES1
	VXOR       HL, PL, T1L         // SAVE: T1L

	CALL p256MulInternal<>(SB)
	VLR  T0, U1L
	VLR  T1, U1H

	// SUB(H<H-T)            // H  = H-U1
	p256SubInternal(HH,HL,HH,HL,T1,T0)

	// if H == 0 or H^P == 0 then ret=1 else ret=0
	// clobbers T1H and T1L
	MOVD   $0, ISZERO
	MOVD   $1, TRUE
	VZERO  ZER
	VO     HL, HH, T1H
	VCEQGS ZER, T1H, T1H
	MOVDEQ TRUE, ISZERO
	VX     HL, PL, T1L
	VX     HH, PH, T1H
	VO     T1L, T1H, T1H

// 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

}

// isUnsafePoint returns whether p is an unsafe point.
func (c *ctxt0) isUnsafePoint(p *obj.Prog) bool {
	// If p explicitly uses REGTMP, it's unsafe to preempt, because the
	// preemption sequence clobbers REGTMP.
	return p.From.Reg == REGTMP || p.To.Reg == REGTMP || p.Reg == REGTMP
}

// isRestartable returns whether p is a multi-instruction sequence that,
// if preempted, can be restarted.

(MOVBQZX x:(MOVBload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVBload <v.Type> [off] {sym} ptr mem)
(MOVBQZX x:(MOVWload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVBload <v.Type> [off] {sym} ptr mem)
(MOVBQZX x:(MOVLload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVBload <v.Type> [off] {sym} ptr mem)