rst/rstf/byteswap.s

/*
* ========== Copyright Header Begin ==========================================
*
* OpenSPARC T2 Processor File: byteswap.s
* Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
*
* The above named program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* The above named program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ========== Copyright Header End ============================================
*/
#if defined(ARCH_AMD64)

        .text

/*============================================================================*\
 * uint16_t byteswap16( uint16_t v )
\*============================================================================*/
        .align  16
        .globl  byteswap16
        .type   byteswap16, @function
byteswap16:
        movw    %di,%ax
        xchgb   %ah,%al
        ret
        .size   byteswap16, [.-byteswap16]

/*============================================================================*\
 * uint32_t byteswap32( uint32_t v )
\*============================================================================*/
        .align  16
        .globl  byteswap32

        .type   byteswap32, @function
byteswap32:
        movl    %edi,%eax
        bswapl  %eax
        ret
        .size   byteswap32, [.-byteswap32]

/*============================================================================*\
 * uint64_t byteswap64( uint64_t v )
\*============================================================================*/
        .align  16
        .globl  byteswap64
        .type   byteswap64, @function
byteswap64:
        movq    %rdi,%rax
        bswapq  %rax
        ret
        .size   byteswap64, [.-byteswap64]

#endif