// The general form of a test input line is:
		//	// comment
		//	INST args [// printed form] [// hex encoding]
		parts := strings.Split(line, "//")
		printed := strings.TrimSpace(parts[0])
		if printed == "" || strings.HasSuffix(printed, ":") { // empty or label
			continue
		}
		seq++

		var hexes string
		switch len(parts) {
		default:
			t.Errorf("%s:%d: unable to understand comments: %s", input, lineno, line)
		case 1:

				path = tf
			}

			f, err := os.Open(path)
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			defer f.Close()

			var fr io.Reader = f
			if strings.HasSuffix(v.file, ".bz2") || strings.HasSuffix(v.file, ".bz2.base64") {
				fr = bzip2.NewReader(fr)
			}

			// Capture all headers and checksums.
			var (
				tr      = NewReader(fr)
				hdrs    []*Header
				chksums []string

			if len(bmbuf) < n {
				bmbuf = make([]byte, n)
			}
			b.SetBytes(int64(n))
			f(b, n)
		})
	}
}

var indexSizes = []int{10, 32, 4 << 10, 4 << 20, 64 << 20}

var isRaceBuilder = strings.HasSuffix(testenv.Builder(), "-race")

func BenchmarkIndexByte(b *testing.B) {
	benchBytes(b, indexSizes, bmIndexByte(IndexByte))
}

func BenchmarkIndexBytePortable(b *testing.B) {