if err != nil {
			log.Fatal(err)
		}
		defer c.Close()
		cf, err := c.(*net.TCPConn).File()
		if err != nil {
			log.Fatal(err)
		}
		defer cf.Close()
		if err := syscall.SetNonblock(int(cf.Fd()), false); err != nil {
			log.Fatal(err)
		}
		// See comments in testPipe.
		sendSomeSignals()
		if _, err := cf.Write(bytes.Repeat([]byte{0}, 2<<20)); err != nil {
			log.Fatal(err)
		}
	}()

	plugin.SetTokenRotation(false)
	for id, tc := range testCases {
		id, tc := id, tc
		t.Run(id, func(t *testing.T) {
			t.Parallel()
			cf, err := NewCredFetcher(
				tc.fetcherType, tc.trustdomain, tc.jwtPath, tc.identityProvider)
			if cf != nil {
				defer cf.Stop()
			}
			if len(tc.expectedErr) > 0 {
				if err == nil {
					t.Errorf("%s: succeeded. Error expected: %v", id, err)

	var wg sync.WaitGroup
	ccf := make([][]CancelFunc, gomaxprocs)
	for i := range ccf {
		wg.Add(1)
		go func(i int) {
			defer wg.Done()
			cf := make([]CancelFunc, perPContexts)
			for j := range cf {
				_, cf[j] = WithTimeout(root, time.Hour)
			}
			ccf[i] = cf
		}(i)
	}
	wg.Wait()

	b.ResetTimer()
	b.RunParallel(func(pb *testing.PB) {
		wcf := make([]CancelFunc, 10)
		for pb.Next() {

00000210  30 33 cf 04 16 03 03 00  04 0e 00 00 00           |03...........|
>>> Flow 3 (client to server)
00000000  16 03 03 00 25 10 00 00  21 20 2f e5 7d a3 47 cd  |....%...! /.}.G.|
00000010  62 43 15 28 da ac 5f bb  29 07 30 ff f6 84 af c4  |bC.(.._.).0.....|
00000020  cf c2 ed 90 99 5f 58 cb  3b 74 14 03 03 00 01 01  |....._X.;t......|
00000030  16 03 03 00 20 69 ac be  cf f1 3d 8a 4e f3 3a 54  |.... i....=.N.:T|

extern void F(T);

// Use weak as a hack to permit defining a function even though we use export.
void CF(int x) __attribute__ ((weak));
void CF(int x) {
	T *t = malloc(sizeof(T));
	t->b = (char)x;
	t->x = x;
	t->y = x;
	F(*t);
}
*/
import "C"

//export F
func F(t C.T) { println(t.b, t.x, t.y) }

func main() {
	C.CF(C.int(0))

000002c0  ff f6 84 af c4 cf c2 ed  90 99 5f 58 cb 3b 74 08  |.........._X.;t.|
000002d0  04 00 80 41 24 c2 f9 e8  40 21 47 3c ab 8e 99 5e  |...A$...@!G<...^|
000002e0  0e 08 27 86 6c 29 ae 36  ed 21 18 23 67 cc f7 d5  |..'.l).6.!.#g...|
000002f0  3f e2 2c 48 2f 3d 47 e5  af d5 61 86 0f 91 69 30  |?.,H/=G...a...i0|
00000300  cf 84 56 f2 d3 c1 9a a3  a1 a2 c8 ef 4d 33 de 12  |..V.........M3..|

	// Helper to read a single counter data file.
	readcdf := func(cdf string) error {
		cf, err := os.Open(cdf)
		if err != nil {
			return fmt.Errorf("opening counter data file %s: %s", cdf, err)
		}
		defer cf.Close()
		var cdr *decodecounter.CounterDataReader
		cdr, err = decodecounter.NewCounterDataReader(cdf, cf)
		if err != nil {
			return fmt.Errorf("reading counter data file %s: %s", cdf, err)
		}

	// regular loop body unrolled 4x
	ADDQ CX, CX		// restore CF
	MOVQ 0(R8)(SI*8), R11
	MOVQ 8(R8)(SI*8), R12
	MOVQ 16(R8)(SI*8), R13
	MOVQ 24(R8)(SI*8), R14
	ADCQ 0(R9)(SI*8), R11
	ADCQ 8(R9)(SI*8), R12
	ADCQ 16(R9)(SI*8), R13
	ADCQ 24(R9)(SI*8), R14
	MOVQ R11, 0(R10)(SI*8)
	MOVQ R12, 8(R10)(SI*8)
	MOVQ R13, 16(R10)(SI*8)
	MOVQ R14, 24(R10)(SI*8)
	SBBQ CX, CX		// save CF

	ADDQ $4, SI		// i += 4
	SUBQ $4, DI		// n -= 4

	MOVL z+0(FP), DI
	MOVL x+12(FP), SI
	MOVL y+24(FP), CX
	MOVL z_len+4(FP), BP
	MOVL $0, BX		// i = 0
	MOVL $0, DX		// c = 0
	JMP E1

L1:	MOVL (SI)(BX*4), AX
	ADDL DX, DX		// restore CF
	ADCL (CX)(BX*4), AX
	SBBL DX, DX		// save CF
	MOVL AX, (DI)(BX*4)
	ADDL $1, BX		// i++

E1:	CMPL BX, BP		// i < n
	JL L1

	NEGL DX
	MOVL DX, c+36(FP)
	RET


// func subVV(z, x, y []Word) (c Word)

00000120  1f 96 8f 84 96 a6 94 f0  a0 9e 03 04 67 a2 e9 e3  |............g...|
00000130  38 0c cd f3 af 45 77 65  33 06 e7 aa cf a0 e6 01  |8....Ewe3.......|
00000140  a7 5f 62 95 32 18 b9 58  03 db 9c ca c7 50 80 cf  |._b.2..X.....P..|
00000150  15 1c b0 7e 97 30 bb e2  bf d5 67 f4 e1 87 1e 07  |...~.0....g.....|
00000160  71 2f f5 31 7e 7e 05 8a  cb a1 98 83 de de aa 87  |q/.1~~..........|