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dimitri |
1.2 |
C $Header: /u/gcmpack/MITgcm/eesupp/src/mds_byteswapr4.F,v 1.1 2005/08/23 13:21:08 jmc Exp $ |
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jmc |
1.1 |
C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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subroutine MDS_BYTESWAPR4( n, arr ) |
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C IN: |
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C n integer - Number of 4-byte words in arr |
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C IN/OUT: |
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C arr real*4 - Array declared as real*4(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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dimitri |
1.2 |
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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=4) arr(n), i32 |
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C Local |
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integer i |
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i32(i) = ishft(i.and. z'ff000000', -24) .or. |
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& ishft(i.and. z'00ff0000', -8) .or. |
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& ishft(i.and. z'0000ff00', 8) .or. |
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& ishft(i.and. z'000000ff', 24) |
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do i = 1,n |
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arr(i) = i32(arr(i)) |
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enddo |
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#else /* FAST_BYTESWAP */ |
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jmc |
1.1 |
C Arguments |
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integer n |
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character*(*) arr |
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dimitri |
1.2 |
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jmc |
1.1 |
C Local |
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integer i |
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character*(1) cc |
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dimitri |
1.2 |
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jmc |
1.1 |
do i=1,4*n,4 |
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cc=arr(i:i) |
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arr(i:i)=arr(i+3:i+3) |
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arr(i+3:i+3)=cc |
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cc=arr(i+1:i+1) |
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arr(i+1:i+1)=arr(i+2:i+2) |
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arr(i+2:i+2)=cc |
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enddo |
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dimitri |
1.2 |
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#endif /* FAST_BYTESWAP */ |
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jmc |
1.1 |
return |
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end |
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