OFOR:              "for",
	OGE:               ">=",
	OGOTO:             "goto",
	OGT:               ">",
	OIF:               "if",
	OIMAG:             "imag",
	OINLMARK:          "inlmark",
	ODEREF:            "*",
	OLEN:              "len",
	OLE:               "<=",
	OLSH:              "<<",
	OLT:               "<",
	OMAKE:             "make",
	ONEG:              "-",
	OMAX:              "max",

}

// linkname records a //go:linkname directive.
type linkname struct {
	pos    syntax.Pos
	local  string
	remote string
}

var unOps = [...]ir.Op{
	syntax.Recv: ir.ORECV,
	syntax.Mul:  ir.ODEREF,
	syntax.And:  ir.OADDR,

	syntax.Not: ir.ONOT,
	syntax.Xor: ir.OBITNOT,
	syntax.Add: ir.OPLUS,
	syntax.Sub: ir.ONEG,
}

var binOps = [...]ir.Op{
	syntax.OrOr:   ir.OOROR,

}

func gd2() int { // ERROR "can inline gd2"
	return 1
}

func gd3() func() { // ERROR "can inline gd3"
	return ii
}

// Issue #42788 - ensure ODEREF OCONVNOP* OADDR is low cost.
func EncodeQuad(d []uint32, x [6]float32) { // ERROR "can inline EncodeQuad" "d does not escape"
	_ = d[:6]
	d[0] = float32bits(x[0]) // ERROR "inlining call to float32bits"

		case ir.OCALLFUNC, ir.OCALLINTER,
			ir.OUNSAFEADD, ir.OUNSAFESLICE:
			return true

		case ir.OINDEX, ir.OSLICE, ir.OSLICEARR, ir.OSLICE3, ir.OSLICE3ARR, ir.OSLICESTR,
			ir.ODEREF, ir.ODOTPTR, ir.ODOTTYPE, ir.ODYNAMICDOTTYPE, ir.ODIV, ir.OMOD,
			ir.OSLICE2ARR, ir.OSLICE2ARRPTR:
			// These ops might panic, make sure they are done
			// before we start marshaling args for a call. See issue 16760.

}

func gd2() int { // ERROR "can inline gd2"
	return 1
}

func gd3() func() { // ERROR "can inline gd3"
	return ii
}

// Issue #42788 - ensure ODEREF OCONVNOP* OADDR is low cost.
func EncodeQuad(d []uint32, x [6]float32) { // ERROR "can inline EncodeQuad" "d does not escape"
	_ = d[:6]
	d[0] = float32bits(x[0]) // ERROR "inlining call to float32bits"

	case ir.ODOTMETH, ir.ODOTINTER:
		n := n.(*ir.SelectorExpr)
		n.X = walkExpr(n.X, init)
		return n

	case ir.OADDR:
		n := n.(*ir.AddrExpr)
		n.X = walkExpr(n.X, init)
		return n

	case ir.ODEREF:
		n := n.(*ir.StarExpr)
		n.X = walkExpr(n.X, init)
		return n

	case ir.OMAKEFACE, ir.OAND, ir.OANDNOT, ir.OSUB, ir.OMUL, ir.OADD, ir.OOR, ir.OXOR, ir.OLSH, ir.ORSH,
		ir.OUNSAFEADD:
		n := n.(*ir.BinaryExpr)

			if ir.IsBlank(n) {
				base.Errorf("cannot use _ as value")
				n.SetType(nil)
				return n
			}
			n.SetUsed(true)
		}
		return n

	// type or expr
	case ir.ODEREF:
		n := n.(*ir.StarExpr)
		return tcStar(n, top)

	// x op= y
	case ir.OASOP:
		n := n.(*ir.AssignOpStmt)
		n.X, n.Y = Expr(n.X), Expr(n.Y)
		checkassign(n.X)

	if stmt.X.Op() != ir.OINDEX {
		return nil
	}
	lhs := stmt.X.(*ir.IndexExpr)
	x := lhs.X
	if a.Type().IsPtr() && a.Type().Elem().IsArray() {
		if s, ok := x.(*ir.StarExpr); ok && s.Op() == ir.ODEREF {
			x = s.X
		}
	}

	if !ir.SameSafeExpr(x, a) || !ir.SameSafeExpr(lhs.Index, v1) {
		return nil
	}

	if !ir.IsZero(stmt.Y) {
		return nil
	}

		default:
			base.Fatalf("unexpected lvalue %v", l.Op())
		case ir.ONAME:
			name = l.(*ir.Name)
		case ir.OINDEX, ir.OINDEXMAP:
			l := l.(*ir.IndexExpr)
			save(&l.X)
			save(&l.Index)
		case ir.ODEREF:
			l := l.(*ir.StarExpr)
			save(&l.X)
		case ir.ODOTPTR:
			l := l.(*ir.SelectorExpr)
			save(&l.X)
		}

		// Save expression on right side.
		save(&r)

	if ir.IsConst(n.Len, constant.Int) && ir.Int64Val(n.Len) < 0 {
		base.Fatalf("len for OSTRINGHEADER must be non-negative")
	}

	return n
}

// tcStar typechecks an ODEREF node, which may be an expression or a type.
func tcStar(n *ir.StarExpr, top int) ir.Node {
	n.X = typecheck(n.X, ctxExpr|ctxType)
	l := n.X
	t := l.Type()
	if t == nil {
		n.SetType(nil)
		return n
	}