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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [rdi-share/] [angel_bytesex.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 106 markom
/*
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 * Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
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 *
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 * This software may be freely used, copied, modified, and distributed
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 * provided that the above copyright notice is preserved in all copies of the
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 * software.
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 */
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/*
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 * angel_bytesex.c - Code to support byte-sex independence
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 * Copyright: (C) 1991, Advanced RISC Machines Ltd., Cambridge, England.
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 */
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/*
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 * RCS $Revision: 1.1.1.1 $
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 * Checkin $Date: 2001-05-18 11:16:30 $
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 */
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#include "angel_bytesex.h"
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static int reversing_bytes = 0;
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void bytesex_reverse(yes_or_no)
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int yes_or_no;
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{ reversing_bytes = yes_or_no;
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}
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int bytesex_reversing()
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{
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  return reversing_bytes;
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}
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int32 bytesex_hostval(v)
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int32 v;
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{ /* Return v with the same endian-ness as the host */
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  /* This mess generates better ARM code than the more obvious mess */
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  /* and may eventually peephole to optimal code...                 */
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  if (reversing_bytes)
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  { unsigned32 t;
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    /* t = v ^ (v ror 16) */
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    t = v ^ ((v << 16) | (((unsigned32)v) >> 16));
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    t &= ~0xff0000;
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    /* v = v ror 8 */
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    v = (v << 24) | (((unsigned32)v) >> 8);
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    v = v ^ (t >> 8);
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  }
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  return v;
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}
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int32 bytesex_hostval_16(v)
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int32 v;
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{
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  if (reversing_bytes) {
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    v = ((v >> 8) & 0xff) | ((v << 8) & 0xff00);
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  }
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  return v;
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}

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