check_endian Subroutine

  1. penf.F90
  2. penf
  3. check_endian

public subroutine check_endian()

Check the type of bit ordering (big or little endian) of the running architecture.

Arguments

None

Called By

proc~~check_endian~~CalledByGraph proc~check_endian check_endian proc~penf_init penf_init proc~penf_init->proc~check_endian program~test_all test_all program~test_all->proc~penf_init program~compact_real compact_real program~compact_real->proc~penf_init
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Source Code

check_endian

Source Code

  subroutine check_endian()
  !---------------------------------------------------------------------------------------------------------------------------------
  !< Check the type of bit ordering (big or little endian) of the running architecture.
  !<
  !> @note The result is stored into the *endian* global variable.
  !---------------------------------------------------------------------------------------------------------------------------------

  !---------------------------------------------------------------------------------------------------------------------------------
  if (is_little_endian()) then
    endian = endianL
  else
    endian = endianB
  endif
  return
  !---------------------------------------------------------------------------------------------------------------------------------
  contains
    pure function is_little_endian() result(is_little)
    !-------------------------------------------------------------------------------------------------------------------------------
    !< Check if the type of the bit ordering of the running architecture is little endian.
    !-------------------------------------------------------------------------------------------------------------------------------
    logical      :: is_little !< Logical output: true is the running architecture uses little endian ordering, false otherwise.
    integer(I1P) :: int1(1:4) !< One byte integer array for casting 4 bytes integer.
    !-------------------------------------------------------------------------------------------------------------------------------

    !-------------------------------------------------------------------------------------------------------------------------------
    int1 = transfer(1_I4P, int1)
    is_little = (int1(1)==1_I1P)
    return
    !-------------------------------------------------------------------------------------------------------------------------------
    endfunction is_little_endian
  endsubroutine check_endian

All Procedures

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