// Push the LR to stack, as we'll clobber it in order to
	// push the call. The function being pushed is responsible
	// for restoring the LR and setting the SP back.
	// This extra space is known to gentraceback.
	sp := c.sp() - sys.MinFrameSize
	c.set_sp(sp)
	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
	// In PIC mode, we'll set up (i.e. clobber) R2 on function
	// entry. Save it ahead of time.

			}

			// 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.
			{

	dst.Chmod(0500) // make executable

	// Clobber all the non-v1 opcodes.
	opcodes := map[string]bool{}
	var features []string
	for feature, opcodeList := range featureToOpcodes {
		if runtimeFeatures[feature] {
			features = append(features, fmt.Sprintf("cpu.%s=off", feature))
		}
		for _, op := range opcodeList {
			opcodes[op] = true
		}
	}
	clobber(t, os.Args[0], dst, opcodes)
	if err = dst.Close(); err != nil {

	// we can leave in the flags register at the end of the block. (There
	// is no place to put a flag regeneration instruction.)
	for _, b := range f.Blocks {
		if b.Kind == BlockDefer {
			// Defer blocks internally use/clobber the flags value.
			end[b.ID] = nil
			continue
		}
		for _, v := range b.ControlValues() {
			if v.Type.IsFlags() && end[b.ID] != v {
				end[b.ID] = nil
			}
		}
	}

		v = leftShift(loadBlock, pos, v, shift0-(n-1)*size*8)
	}

	// Install with (Copy v).
	root.reset(OpCopy)
	root.AddArg(v)

	// Clobber the loads, just to prevent additional work being done on
	// subtrees (which are now unreachable).
	for i := int64(0); i < n; i++ {
		clobber(r[i].load)
	}
	return true
}

func memcombineStores(f *Func) {
	mark := f.newSparseSet(f.NumValues())
	defer f.retSparseSet(mark)

	pc := uintptr(c.eip())
	sp := uintptr(c.esp())

	if shouldPushSigpanic(gp, pc, *(*uintptr)(unsafe.Pointer(sp))) {
		c.pushCall(abi.FuncPCABIInternal(sigpanic), pc)
	} else {
		// Not safe to push the call. Just clobber the frame.
		c.set_eip(uint32(abi.FuncPCABIInternal(sigpanic)))
	}
}

func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
	// Make it look like we called target at resumePC.
	sp := uintptr(c.esp())

		ctxt.mainInittasks = ctxt.inittaskSym([]string{fmt.Sprintf("%s..inittask", objabi.PathToPrefix(*flagPluginPath))}, "go:plugin.inittasks")
		// Make symbol local so multiple plugins don't clobber each other's inittask list.
		ctxt.loader.SetAttrLocal(ctxt.mainInittasks, true)
	case BuildModeShared:
		// For a shared library, all packages are roots.
		var roots []string
		for _, lib := range ctxt.Library {

	// cond: canMergeLoad(v, l) && clobber(l)
	// result: (CMPBload {sym} [off] ptr x mem)
	for {
		l := v_0
		if l.Op != OpAMD64MOVBload {
			break
		}
		off := auxIntToInt32(l.AuxInt)
		sym := auxToSym(l.Aux)
		mem := l.Args[1]
		ptr := l.Args[0]
		x := v_1
		if !(canMergeLoad(v, l) && clobber(l)) {
			break
		}
		v.reset(OpAMD64CMPBload)

	RLDCR	$0, R1, $~15, R1	// align SP to 16 bytes
	MOVD	FARG, CTR		// address of function to be called
	MOVD	R0, 0(R1)		// clear back chain pointer
	BL	(CTR)
	MOVD	$0, R0			// C code can clobber R0 set it back to 0
	MOVD	R16, R1			// restore R1;
	MOVD	runtime·tls_g(SB), R10	// find correct g
	MOVD	0(R10), g
	RET

// tls_g, g value for each thread in TLS

	// which takes care of that.
	if shouldPushSigpanic(gp, pc, *(*uintptr)(unsafe.Pointer(sp))) {
		c.pushCall(abi.FuncPCABI0(sigpanic0), pc)
	} else {
		// Not safe to push the call. Just clobber the frame.
		c.set_rip(uint64(abi.FuncPCABI0(sigpanic0)))
	}
}

func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
	// Make it look like we called target at resumePC.
	sp := uintptr(c.rsp())