b.Fatal("bad equal")
			}
		}
		buf1[n-1] = '\x00'
		buf2[n-1] = '\x00'
	}
}

func BenchmarkEqualBothUnaligned(b *testing.B) {
	sizes := []int{64, 4 << 10}
	if !isRaceBuilder {
		sizes = append(sizes, []int{4 << 20, 64 << 20}...)
	}
	maxSize := 2 * (sizes[len(sizes)-1] + 8)
	if len(bmbuf) < maxSize {
		bmbuf = make([]byte, maxSize)
	}

	for _, n := range sizes {

	{"7", func(b *Reader) string { return reads(b, 7) }},
	{"bytes", readBytes},
	{"lines", readLines},
}

const minReadBufferSize = 16

var bufsizes = []int{
	0, minReadBufferSize, 23, 32, 46, 64, 93, 128, 1024, 4096,
}

func TestReader(t *testing.T) {
	var texts [31]string
	str := ""
	all := ""
	for i := 0; i < len(texts)-1; i++ {
		texts[i] = str + "\n"
		all += texts[i]

00001b0 a3 ac e4 dd 3b 1a 8e c6 fe 96 38 6b bf 67 5a 23
00001c0 f4 16 f4 e6 8a b4 fc c2 cd bf 95 66 1d bb 35 aa
00001d0 92 7d 66 d8 08 8d a5 1f 54 2a af 09 cf 61 ff d2
00001e0 85 9d 8f b6 d7 88 07 4a 86 03 db 64 f3 d9 92 73
00001f0 df ec a7 fc 23 4c 8d 83 79 63 2a d9 fd 8d b3 c8
0000200 8f 7e d4 19 85 e6 8d 1c 76 f0 8b 58 32 fd 9a d6
0000210 85 e2 48 ad c3 d5 60 6f 7e 22 dd ef 09 49 7c 7f

		return []string{"-m31"}
	case "s390x":
		return []string{"-m64"}
	case "mips64", "mips64le":
		if gomips64 == "hardfloat" {
			return []string{"-mabi=64", "-mhard-float"}
		} else if gomips64 == "softfloat" {
			return []string{"-mabi=64", "-msoft-float"}
		}
	case "mips", "mipsle":
		if gomips == "hardfloat" {
			return []string{"-mabi=32", "-mfp32", "-mhard-float", "-mno-odd-spreg"}

	VSLI	$63, V7.D2, V8.D2               // e8547f6f
	VUSRA	$8, V2.B16, V3.B16              // 4314086f
	VUSRA	$16, V3.H4, V4.H4               // 6414102f
	VUSRA	$32, V5.S4, V6.S4               // a614206f
	VUSRA	$64, V7.D2, V8.D2               // e814406f
	VTBL	V22.B16, [V28.B16, V29.B16], V11.B16                                    // 8b23164e
	VTBL	V18.B8, [V17.B16, V18.B16, V19.B16], V22.B8                             // 3642120e

	VPSHRDQ $64, Z3, Z26, K1, Z13                      // 6273ad4173eb40
	VPSHRDQ $64, Z0, Z26, K1, Z13                      // 6273ad4173e840
	VPSHRDQ $64, -7(CX)(DX*1), Z26, K1, Z13            // 6273ad4173ac11f9ffffff40
	VPSHRDQ $64, -15(R14)(R15*4), Z26, K1, Z13         // 6213ad4173acbef1ffffff40
	VPSHRDQ $64, Z3, Z3, K1, Z13                       // 6273e54973eb40