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C $Header: /u/gcmpack/MITgcm/eesupp/src/mds_byteswapr8.F,v 1.2 2006/11/22 09:43:27 dimitri Exp $ |
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C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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subroutine MDS_BYTESWAPR8( n, arr ) |
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C IN: |
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C n integer :: Number of 8-byte words in arr |
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C IN/OUT: |
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C arr real*8 :: Array declared as real*8(n) |
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C |
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C Created: 05/05/99 adcroft@mit.edu (This is an unfortunate hack!!) |
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implicit none |
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#ifdef FAST_BYTESWAP |
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C Arguments |
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integer n |
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integer(kind=8) arr(n),i64,i1 |
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C Local |
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integer i |
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|
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i64(i1) = ishft(i1 .and. z'ff00000000000000',-56).or. |
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& ishft(i1 .and. z'00ff000000000000',-40).or. |
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& ishft(i1 .and. z'0000ff0000000000',-24).or. |
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& ishft(i1 .and. z'000000ff00000000', -8).or. |
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& ishft(i1 .and. z'00000000ff000000', 8).or. |
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& ishft(i1 .and. z'0000000000ff0000', 24).or. |
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& ishft(i1 .and. z'000000000000ff00', 40).or. |
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& ishft(i1 .and. z'00000000000000ff', 56) |
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do i=1,n |
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arr(i) = i64(arr(i)) |
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enddo |
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#else /* FAST_BYTESWAP */ |
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|
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C Arguments |
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integer n |
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character*(*) arr |
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|
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C Local |
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integer i |
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character*(1) cc |
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|
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do i=1,8*n,8 |
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cc=arr(i:i) |
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arr(i:i)=arr(i+7:i+7) |
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arr(i+7:i+7)=cc |
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cc=arr(i+1:i+1) |
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arr(i+1:i+1)=arr(i+6:i+6) |
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arr(i+6:i+6)=cc |
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cc=arr(i+2:i+2) |
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arr(i+2:i+2)=arr(i+5:i+5) |
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arr(i+5:i+5)=cc |
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cc=arr(i+3:i+3) |
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arr(i+3:i+3)=arr(i+4:i+4) |
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arr(i+4:i+4)=cc |
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enddo |
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|
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#endif /* FAST_BYTESWAP */ |
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|
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return |
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end |
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