ELOOP           = syscall.Errno(0x3e)
	EMEDIUMTYPE     = syscall.Errno(0x7e)
	EMSGSIZE        = syscall.Errno(0x28)
	EMULTIHOP       = syscall.Errno(0x57)
	ENAMETOOLONG    = syscall.Errno(0x3f)
	ENAVAIL         = syscall.Errno(0x77)
	ENETDOWN        = syscall.Errno(0x32)
	ENETRESET       = syscall.Errno(0x34)
	ENETUNREACH     = syscall.Errno(0x33)
	ENOANO          = syscall.Errno(0x69)

// trailing CCC shifted left 2 bits. The two least-significant bits of tccc
// are the number of trailing non-starters.

const (
	qcInfoMask      = 0x3F // to clear all but the relevant bits in a qcInfo
	headerLenMask   = 0x3F // extract the length value from the header byte
	headerFlagsMask = 0xC0 // extract the qcInfo bits from the header byte
)

//	2 = double precision a.k.a. float64
//
// Bits 10-11 are the rounding mode:
//
//	0 = round to nearest (even on a tie)
//	3 = round toward zero
var (
	controlWord64      uint16 = 0x3f + 2<<8 + 0<<10
	controlWord64trunc uint16 = 0x3f + 2<<8 + 3<<10

	})
	return _p521B
}

	0x42, 0x33, 0x3b, 0xfb, 0xa7, 0x89, 0x2d, 0x42, 0xc3, 0x29, 0xfb, 0xfe, 0xfc, 0x7e, 0xef, 0xe5,
	0xf7, 0xf6, 0xbd, 0x35, 0xf8, 0x70, 0xbc, 0x2b, 0x3c, 0xca, 0x7d, 0x1c, 0x52, 0x1f, 0x0f, 0xa6,
	0x54, 0x08, 0xca, 0x99, 0x3f, 0xdb, 0xf6, 0x87, 0x84, 0x91, 0x08, 0x4b, 0x32, 0xf0, 0xc2, 0x88,
	0x4b, 0x0e, 0xef, 0x25, 0x89, 0x1e, 0x0e, 0xa9, 0x97, 0x25, 0x7a, 0xb3, 0xed, 0xf6, 0xc3, 0x21,

	AF_VENDOR04                       = 0x2f
	AF_VENDOR05                       = 0x31
	AF_VENDOR06                       = 0x33
	AF_VENDOR07                       = 0x35
	AF_VENDOR08                       = 0x37
	AF_VENDOR09                       = 0x39
	AF_VENDOR10                       = 0x3b
	AF_VENDOR11                       = 0x3d
	AF_VENDOR12                       = 0x3f
	AF_VENDOR13                       = 0x41

	AF_VENDOR04                       = 0x2f
	AF_VENDOR05                       = 0x31
	AF_VENDOR06                       = 0x33
	AF_VENDOR07                       = 0x35
	AF_VENDOR08                       = 0x37
	AF_VENDOR09                       = 0x39
	AF_VENDOR10                       = 0x3b
	AF_VENDOR11                       = 0x3d
	AF_VENDOR12                       = 0x3f
	AF_VENDOR13                       = 0x41

	AF_VENDOR04                       = 0x2f
	AF_VENDOR05                       = 0x31
	AF_VENDOR06                       = 0x33
	AF_VENDOR07                       = 0x35
	AF_VENDOR08                       = 0x37
	AF_VENDOR09                       = 0x39
	AF_VENDOR10                       = 0x3b
	AF_VENDOR11                       = 0x3d
	AF_VENDOR12                       = 0x3f
	AF_VENDOR13                       = 0x41

	// to how other linkers handle this (for example this code in lld:
	// https://github.com/llvm/llvm-project/blob/2a3a79ce4c2149d7787d56f9841b66cacc9061d0/lld/MachO/Writer.cpp#L524).
	rv[6] &= 0xcf
	rv[6] |= 0x30
	rv[8] &= 0x3f
	rv[8] |= 0xc0

	return rv
}

// machoRewriteUuid copies over the contents of the Macho executable
// exef into the output file outexe, and in the process updates the

   * also demonstrates how sparse the lookup table is.
   */
  @Test
  fun allFormattedFlagsWithValidBits() {
    val formattedFlags = mutableListOf<String>() // Highest valid flag is 0x20.
    for (i in 0..0x3f) formattedFlags.add(formatFlags(TYPE_HEADERS, i))
    assertThat(formattedFlags).containsExactly(
      "",
      "END_STREAM",
      "00000010",
      "00000011",
      "END_HEADERS",