var ecdsaCipherSuite bool
	if priv, ok := c.PrivateKey.(crypto.Signer); ok {
		switch pub := priv.Public().(type) {
		case *ecdsa.PublicKey:
			var curve CurveID
			switch pub.Curve {
			case elliptic.P256():
				curve = CurveP256
			case elliptic.P384():
				curve = CurveP384
			case elliptic.P521():
				curve = CurveP521
			default:
				return supportsRSAFallback(unsupportedCertificateError(c))
			}

			in:   func() string { return "" },
			want: "",
		},
		{
			name: "valid certificate authority",
			in: func() string {
				caPrivateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
				if err != nil {
					t.Fatal(err)
				}
				caCert, err := certutil.NewSelfSignedCACert(certutil.Config{CommonName: "test-ca"}, caPrivateKey)
				if err != nil {
					t.Fatal(err)
				}

	}
	return nil
}

// TestYCbCrRoundtrip tests that a subset of RGB space can be converted to YCbCr
// and back to within 2/256 tolerance.
func TestYCbCrRoundtrip(t *testing.T) {
	for r := 0; r < 256; r += 7 {
		for g := 0; g < 256; g += 5 {
			for b := 0; b < 256; b += 3 {
				r0, g0, b0 := uint8(r), uint8(g), uint8(b)
				y, cb, cr := RGBToYCbCr(r0, g0, b0)
				r1, g1, b1 := YCbCrToRGB(y, cb, cr)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"

// s390x can copy/zero 1-256 bytes with a single instruction,
// so there's no need for these, except to satisfy the prototypes
// in stubs.go.

TEXT runtime·duffzero(SB),NOSPLIT|NOFRAME,$0-0
	MOVD	$0, 2(R0)
	RET

		p = pp.Append(p, s390x.AMOVD, obj.TYPE_CONST, 0, cnt/256, obj.TYPE_REG, ireg, 0)
		p = pp.Append(p, s390x.ACLEAR, obj.TYPE_CONST, 0, 256, obj.TYPE_MEM, reg, off)
		pl := p
		p = pp.Append(p, s390x.AADD, obj.TYPE_CONST, 0, 256, obj.TYPE_REG, reg, 0)
		p = pp.Append(p, s390x.ABRCTG, obj.TYPE_REG, ireg, 0, obj.TYPE_BRANCH, 0, 0)
		p.To.SetTarget(pl)
		cnt = cnt % 256
	}

	// Generate remaining clear instructions without a loop.

	g GIF
	// globalCT is the size in bytes of the global color table.
	globalCT int
	// buf is a scratch buffer. It must be at least 256 for the blockWriter.
	buf              [256]byte
	globalColorTable [3 * 256]byte
	localColorTable  [3 * 256]byte
}

// blockWriter writes the block structure of GIF image data, which
// comprises (n, (n bytes)) blocks, with 1 <= n <= 255. It is the

		_32bit uintptr     // size on 32bit platforms
		_64bit uintptr     // size on 64bit platforms
	}{
		{Sym{}, 32, 64},
		{Type{}, 64, 104},
		{Map{}, 12, 24},
		{Forward{}, 20, 32},
		{Func{}, 32, 56},
		{Struct{}, 12, 24},
		{Interface{}, 0, 0},
		{Chan{}, 8, 16},
		{Array{}, 12, 16},
		{FuncArgs{}, 4, 8},
		{ChanArgs{}, 4, 8},
		{Ptr{}, 4, 8},
		{Slice{}, 4, 8},
	}

	for _, tt := range tests {

DATA ·IEEEConst+1232(SB)/8,$0x00000001cd2a0ae8
DATA ·IEEEConst+1240(SB)/8,$0x0000000111b0024c

	/* x^181312 mod p(x), x^181248 mod p(x) */
DATA ·IEEEConst+1248(SB)/8,$0x00000001fe4aa8b4
DATA ·IEEEConst+1256(SB)/8,$0x000000010b3079da

	/* x^180288 mod p(x), x^180224 mod p(x) */
DATA ·IEEEConst+1264(SB)/8,$0x00000001d1559a42
DATA ·IEEEConst+1272(SB)/8,$0x000000010192bcc2

	/* x^179264 mod p(x), x^179200 mod p(x) */

// license that can be found in the LICENSE file.

// Test heap sampling logic.

package main

import (
	"fmt"
	"math"
	"runtime"
)

var a16 *[16]byte
var a512 *[512]byte
var a256 *[256]byte
var a1k *[1024]byte
var a16k *[16 * 1024]byte
var a17k *[17 * 1024]byte
var a18k *[18 * 1024]byte

// This test checks that heap sampling produces reasonable results.

		{"4.0", "2.0"},

		{"1p512", "1p256"},
		{"4p1024", "2p512"},
		{"9p2048", "3p1024"},

		{"1p-1024", "1p-512"},
		{"4p-2048", "2p-1024"},
		{"9p-4096", "3p-2048"},
	} {