{name: "MOVHUload", argLength: 2, reg: gpload, aux: "SymOff", asm: "MOVHU", typ: "UInt16", faultOnNilArg0: true, symEffect: "Read"},   // load from arg0 + auxInt + aux.  arg1=mem.

	}

	if bytes.Equal(buf[4:8], []byte("1   ")) {
		// Set as 1,0.
		major, minor = 1, 0
	} else {
		major, minor = binary.LittleEndian.Uint16(buf[4:6]), binary.LittleEndian.Uint16(buf[6:8])
	}
	if major > xlVersionMajor {
		return buf[8:], major, minor, fmt.Errorf("xlMeta: unknown major version %d found", major)
	}

	return buf[8:], major, minor, nil
}

func isXL2V1Format(buf []byte) bool {

// and negates them so that ctz (count trailing zeros) instructions
// can be used. It then places these 8 bytes into the cached 64 bit
// s.allocCache.
func (s *mspan) refillAllocCache(whichByte uint16) {
	bytes := (*[8]uint8)(unsafe.Pointer(s.allocBits.bytep(uintptr(whichByte))))
	aCache := uint64(0)
	aCache |= uint64(bytes[0])
	aCache |= uint64(bytes[1]) << (1 * 8)
	aCache |= uint64(bytes[2]) << (2 * 8)

var debug = flag.Bool("debug", false, "show the errors produced by the tests")

// T has lots of interesting pieces to use to test execution.
type T struct {
	// Basics
	True        bool
	I           int
	U16         uint16
	X, S        string
	FloatZero   float64
	ComplexZero complex128
	// Nested structs.
	U *U
	// Struct with String method.
	V0     V
	V1, V2 *V
	// Struct with Error method.
	W0     W
	W1, W2 *W

(MOVBZreg (MOVDconst [c]))  => (MOVDconst [int64(uint8(c))])
(MOVBreg (MOVDconst [c]))  => (MOVDconst [int64(int8(c))])
(MOVHZreg (MOVDconst [c]))  => (MOVDconst [int64(uint16(c))])
(MOVHreg (MOVDconst [c]))  => (MOVDconst [int64(int16(c))])
(MOVWreg (MOVDconst [c])) => (MOVDconst [int64(int32(c))])
(MOVWZreg (MOVDconst [c])) => (MOVDconst [int64(uint32(c))])

			t.Error(".reloc section is not present")
		}
		if (f.FileHeader.Characteristics & pe.IMAGE_FILE_RELOCS_STRIPPED) != 0 {
			t.Error("IMAGE_FILE_RELOCS_STRIPPED flag is set")
		}
		var dc uint16
		switch oh := f.OptionalHeader.(type) {
		case *pe.OptionalHeader32:
			dc = oh.DllCharacteristics
		case *pe.OptionalHeader64:
			dc = oh.DllCharacteristics

	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
		w.Write([]byte("Hello"))
	})).ts

	c := ts.Client()
	tr := c.Transport.(*Transport)
	tr.TLSClientConfig.CipherSuites = []uint16{tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256}
	tr.TLSClientConfig.MaxVersion = tls.VersionTLS12 // to get to pick the cipher suite
	tr.Dial = func(netw, addr string) (net.Conn, error) {

	c1 := &xcmp[a1]
	c3 := &xcmp[a3]
	for i := range ops {
		op := &ops[i]
		if int(op.a2) == a2 && c1[op.a1] && c3[op.a3] && (op.family == 0 || c.ctxt.Arch.Family == op.family) {
			p.Optab = uint16(cap(optab) - cap(ops) + i + 1)
			return op
		}
	}

	c.ctxt.Diag("illegal combination %v %v %v %v", p.As, DRconv(a1), DRconv(a2), DRconv(a3))
	prasm(p)

// Otherwise it returns 0.
func nextFreeFast(s *mspan) gclinkptr {
	theBit := sys.TrailingZeros64(s.allocCache) // Is there a free object in the allocCache?
	if theBit < 64 {
		result := s.freeindex + uint16(theBit)
		if result < s.nelems {
			freeidx := result + 1
			if freeidx%64 == 0 && freeidx != s.nelems {
				return 0
			}
			s.allocCache >>= uint(theBit + 1)
			s.freeindex = freeidx
			s.allocCount++

	c1 := &xcmp[a1]
	c4 := &xcmp[a4]
	for i := range ops {
		op := &ops[i]
		if (int(op.reg) == a2) && int(op.from3) == a3 && c1[op.from1] && c4[op.to1] && (int(op.to2) == a5) {
			p.Optab = uint16(cap(optab) - cap(ops) + i + 1)
			return op
		}
	}

	c.ctxt.Diag("illegal combination %v %v %v %v %v %v", p.As, DRconv(a1), DRconv(a2), DRconv(a3), DRconv(a4), DRconv(a5))
	prasm(p)