switch name {
	case "CR":
		if 0 <= n && n <= 7 {
			return ppc64.REG_CR0 + n, true
		}
	case "A":
		if 0 <= n && n <= 8 {
			return ppc64.REG_A0 + n, true
		}
	case "VS":
		if 0 <= n && n <= 63 {
			return ppc64.REG_VS0 + n, true
		}
	case "V":
		if 0 <= n && n <= 31 {
			return ppc64.REG_V0 + n, true
		}
	case "F":
		if 0 <= n && n <= 31 {

}

func s390xRegisterNumber(name string, n int16) (int16, bool) {
	switch name {
	case "AR":
		if 0 <= n && n <= 15 {
			return s390x.REG_AR0 + n, true
		}
	case "F":
		if 0 <= n && n <= 15 {
			return s390x.REG_F0 + n, true
		}
	case "R":
		if 0 <= n && n <= 15 {
			return s390x.REG_R0 + n, true
		}
	case "V":
		if 0 <= n && n <= 31 {
			return s390x.REG_V0 + n, true
		}
	}
	return 0, false

	// probably because it is not in POSIX.1, so we define it here.
	// It is not defined on Solaris.
	var nproc int
	setNproc := true
	switch runtime.GOOS {
	default:
		setNproc = false
	case "aix":
		nproc = 9
	case "linux":
		nproc = 6
	case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd":
		nproc = 7
	}
	if setNproc {
		var rlim syscall.Rlimit
		if syscall.Getrlimit(nproc, &rlim) == nil {

import (
	"fmt"
	"os"
)

func main() {
	if len(os.Args) != 2 {
		fatal("usage: callback testname")
	}
	switch os.Args[1] {
	default:
		fatal("unknown test %q", os.Args[1])
	case "Call":
		testCall()
	case "Callback":
		testCallback()
	}
	println("OK")
}

func fatal(f string, args ...any) {
	fmt.Fprintln(os.Stderr, fmt.Sprintf(f, args...))
	os.Exit(1)
}

type GoCallback struct{}

	if n < utf8.UTFMax || n > 1e9 {
		panic("bad max token size")
	}
	if n < len(s.buf) {
		s.buf = make([]byte, n)
	}
	s.maxTokenSize = n
}

// ErrOrEOF is like Err, but returns EOF. Used to test a corner case.
func (s *Scanner) ErrOrEOF() error {
	return s.err

	switch n := x.(type) {
	default:
		error_(token.NoPos, "unexpected type %T in walk", x)
		panic("unexpected type")

	case *ast.IndexListExpr:
		f.walk(&n.X, ctxExpr, visit)
		f.walk(n.Indices, ctxExpr, visit)
	}
}

func funcTypeTypeParams(n *ast.FuncType) *ast.FieldList {
	return n.TypeParams
}

}

func (t *Tokenizer) File() string {
	return t.base.Filename()
}

func (t *Tokenizer) Base() *src.PosBase {
	return t.base
}

func (t *Tokenizer) SetBase(base *src.PosBase) {
	t.base = base
}

func (t *Tokenizer) Line() int {
	return t.line
}

func (t *Tokenizer) Col() int {
	return t.s.Pos().Column
}

func (t *Tokenizer) Next() ScanToken {
	s := t.s
	for {

	switch op {
	case loong64.ARDTIMELW, loong64.ARDTIMEHW, loong64.ARDTIMED:
		return true
	}
	return false
}

func loong64RegisterNumber(name string, n int16) (int16, bool) {
	switch name {
	case "F":
		if 0 <= n && n <= 31 {
			return loong64.REG_F0 + n, true
		}
	case "FCSR":
		if 0 <= n && n <= 31 {
			return loong64.REG_FCSR0 + n, true
		}
	case "FCC":
		if 0 <= n && n <= 31 {

func IsARMCMP(op obj.As) bool {
	switch op {
	case arm.ACMN, arm.ACMP, arm.ATEQ, arm.ATST:
		return true
	}
	return false
}

// IsARMSTREX reports whether the op (as defined by an arm.A* constant) is
// one of the STREX-like instructions that require special handling.
func IsARMSTREX(op obj.As) bool {
	switch op {
	case arm.ASTREX, arm.ASTREXD, arm.ASWPW, arm.ASWPBU:
		return true
	}

	switch *flags.Spectre {
	default:
		log.Printf("unknown setting -spectre=%s", *flags.Spectre)
		os.Exit(2)
	case "":
		// nothing
	case "index":
		// known to compiler; ignore here so people can use
		// the same list with -gcflags=-spectre=LIST and -asmflags=-spectrre=LIST
	case "all", "ret":
		ctxt.Retpoline = true
	}

	ctxt.Bso = bufio.NewWriter(os.Stdout)
	defer ctxt.Bso.Flush()