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edhill |
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C $Header: /u/gcmpack/MITgcm/pkg/ex3/ex3_util.F,v 1.2 2005/10/16 06:55:48 edhill Exp $ |
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C $Name: $ |
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#include "EX3_OPTIONS.h" |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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CBOP 0 |
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C !ROUTINE: EX3_GET_BUFFTAG |
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C !INTERFACE: |
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SUBROUTINE EX3_GET_BUFFTAG( |
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I i_sendtile, i_recvtile, i_neigh, |
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O bufftag, |
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I myThid ) |
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C !DESCRIPTION: |
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C Vector exchange routine which copies values from two input arrays, |
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C performs a rotation/permutation of the values, writes the values |
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C to two buffers in the specified order and then, if necessary, |
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C calls the appropriate MPI send functions. |
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C !USES: |
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IMPLICIT NONE |
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#include "EX3_SIZE.h" |
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C !INPUT PARAMETERS: |
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INTEGER i_sendtile, i_recvtile, i_neigh |
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INTEGER bifftag |
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INTEGER myThid |
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CEOP |
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C !LOCAL VARIABLES |
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INTEGER bufftag |
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C Probably a 32-bit (signed or unsigned?) int so things are fine as |
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C when: (EX3_MAX_E_NBS * EX3_MAX_TILES) < 21,000 |
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C . 2^32 = 4294967296 |
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C . 2^31 = 2147483648 |
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C . 2^30 = 1073741824 |
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C |
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C . 2100021000 |
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C . rrrrrsssss |
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C . 0987654321 |
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bufftag = |
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& (i_sendtile - 1)*EX3_MAX_E_NBS + i_neigh |
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& + 100000*( (i_recvtile - 1)*EX3_MAX_E_NBS + i_neigh ) |
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RETURN |
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END |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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