}
		}
	}
}

// The optab size should remain constant when reinitializing the PPC64 assembler backend.
func TestOptabReinit(t *testing.T) {
	buildcfg.GOOS = "linux"
	buildcfg.GOARCH = "ppc64le"
	buildcfg.GOPPC64 = 8
	buildop(nil)
	optabLen := len(optab)
	buildcfg.GOPPC64 = 9
	buildop(nil)
	reinitOptabLen := len(optab)
	if reinitOptabLen != optabLen {

const (
	BIG = 2048 - 8
)

const (
	/* mark flags */
	LABEL = 1 << iota
	LEAF
	FLOAT
	BRANCH
	LOAD
	FCMP
	SYNC
	LIST
	FOLL
	NOSCHED
)

const (
	// optab is sorted based on the order of these constants
	// and the first match is chosen.
	// The more specific class needs to come earlier.
	C_NONE   = iota + 1 // starting from 1, leave unclassified Addr's class as 0

	As       As        // assembler opcode
	Reg      int16     // 2nd source operand
	RegTo2   int16     // 2nd destination operand
	Mark     uint16    // bitmask of arch-specific items
	Optab    uint16    // arch-specific opcode index
	Scond    uint8     // bits that describe instruction suffixes (e.g. ARM conditions, RISCV Rounding Mode)
	Back     uint8     // for x86 back end: backwards branch state

				// same check.
				shift = 7
			}
			p.From.Type = obj.TYPE_REG
			p.From.Reg = int16(REG_LSL + r + (shift&7)<<5)
			p.From.Offset = 0
		}
	}
}

func nocache(p *obj.Prog) {
	p.Optab = 0
	p.From.Class = 0
	p.To.Class = 0
}

var unaryDst = map[obj.As]bool{
	AWORD:  true,
	ADWORD: true,
	ABL:    true,
	AB:     true,
	ACLREX: true,
}

			p.As = AANDISCC
			p.From.Offset >>= 16
		}

	// To maintain backwards compatibility, we accept some 4 argument usage of
	// several opcodes which was likely not intended, but did work. These are not
	// added to optab to avoid the chance this behavior might be used with newer
	// instructions.
	//
	// Rewrite argument ordering like "ADDEX R3, $3, R4, R5" into
	//                                "ADDEX R3, R4, $3, R5"

	slice(itablinkSym, nitablinks)

	// The ptab slice
	if ptab := ldr.Lookup("go:plugin.tabs", 0); ptab != 0 && ldr.AttrReachable(ptab) {
		ldr.SetAttrLocal(ptab, true)
		if ldr.SymType(ptab) != sym.SRODATA {
			panic(fmt.Sprintf("go:plugin.tabs is %v, not SRODATA", ldr.SymType(ptab)))
		}
		nentries := uint64(len(ldr.Data(ptab)) / 8) // sizeof(nameOff) + sizeof(typeOff)
		slice(ptab, nentries)
	} else {
		nilSlice()
	}

// from an interface's descriptor word (whether a *runtime._type or
// *runtime.itab pointer).
func typeHashFieldOf(pos src.XPos, itab *ir.UnaryExpr) *ir.SelectorExpr {
	if itab.Op() != ir.OITAB {
		base.Fatalf("expected OITAB, got %v", itab.Op())
	}
	var hashField *types.Field
	if itab.X.Type().IsEmptyInterface() {
		// runtime._type's hash field
		if rtypeHashField == nil {

			n.SetType(nil)
			return n
		}
	}
	return n
}

// tcITab typechecks an OITAB node.
func tcITab(n *ir.UnaryExpr) ir.Node {
	n.X = Expr(n.X)
	t := n.X.Type()
	if t == nil {
		n.SetType(nil)
		return n
	}
	if !t.IsInterface() {
		base.Fatalf("OITAB of %v", t)
	}
	n.SetType(types.NewPtr(types.Types[types.TUINTPTR]))
	return n
}

			ir.OAND, ir.OANDNOT, ir.OLSH, ir.OOR, ir.ORSH, ir.OXOR, ir.OCOMPLEX, ir.OMAKEFACE,
			ir.OADDR, ir.OBITNOT, ir.ONOT, ir.OPLUS,
			ir.OCAP, ir.OIMAG, ir.OLEN, ir.OREAL,
			ir.OCONVNOP, ir.ODOT,
			ir.OCFUNC, ir.OIDATA, ir.OITAB, ir.OSPTR,
			ir.OBYTES2STRTMP, ir.OGETG, ir.OGETCALLERPC, ir.OGETCALLERSP, ir.OSLICEHEADER, ir.OSTRINGHEADER:
			// ok: operations that don't require function calls.
			// Expand as needed.
		}

		return false

	case ir.OUNSAFESTRINGDATA:
		n := n.(*ir.UnaryExpr)
		return tcUnsafeData(n)

	case ir.OITAB:
		n := n.(*ir.UnaryExpr)
		return tcITab(n)

	case ir.OIDATA:
		// Whoever creates the OIDATA node must know a priori the concrete type at that moment,
		// usually by just having checked the OITAB.
		n := n.(*ir.UnaryExpr)
		base.Fatalf("cannot typecheck interface data %v", n)
		panic("unreachable")