symbian-qemu-0.9.1-12/libsdl-trunk/include/SDL_endian.h
author Mike Kinghan <mikek@symbian.org>
Thu, 25 Nov 2010 14:28:39 +0000
branchGCC_SURGE
changeset 135 10852f1a0ae9
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Merge a pointless head that got away.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* Functions for reading and writing endian-specific values */
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#ifndef _SDL_endian_h
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#define _SDL_endian_h
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#include "SDL_stdinc.h"
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/* The two types of endianness */
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#define SDL_LIL_ENDIAN	1234
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#define SDL_BIG_ENDIAN	4321
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#ifndef SDL_BYTEORDER	/* Not defined in SDL_config.h? */
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#if defined(__hppa__) || \
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    defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
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    (defined(__MIPS__) && defined(__MISPEB__)) || \
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    defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
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    defined(__sparc__)
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#define SDL_BYTEORDER	SDL_BIG_ENDIAN
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#else
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#define SDL_BYTEORDER	SDL_LIL_ENDIAN
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#endif
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#endif /* !SDL_BYTEORDER */
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Use inline functions for compilers that support them, and static
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   functions for those that do not.  Because these functions become
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   static for compilers that do not support inline functions, this
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   header should only be included in files that actually use them.
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*/
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#if defined(__GNUC__) && defined(__i386__) && \
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   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
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static __inline__ Uint16 SDL_Swap16(Uint16 x)
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{
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	__asm__("xchgb %b0,%h0" : "=q" (x) :  "0" (x));
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	return x;
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}
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#elif defined(__GNUC__) && defined(__x86_64__)
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static __inline__ Uint16 SDL_Swap16(Uint16 x)
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{
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	__asm__("xchgb %b0,%h0" : "=Q" (x) :  "0" (x));
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	return x;
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}
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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static __inline__ Uint16 SDL_Swap16(Uint16 x)
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{
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	Uint16 result;
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	__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
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	return result;
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}
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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static __inline__ Uint16 SDL_Swap16(Uint16 x)
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{
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	__asm__("rorw #8,%0" : "=d" (x) :  "0" (x) : "cc");
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	return x;
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}
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#else
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static __inline__ Uint16 SDL_Swap16(Uint16 x) {
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	return((x<<8)|(x>>8));
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}
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#endif
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#if defined(__GNUC__) && defined(__i386__) && \
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   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
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static __inline__ Uint32 SDL_Swap32(Uint32 x)
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{
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	__asm__("bswap %0" : "=r" (x) : "0" (x));
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	return x;
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}
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#elif defined(__GNUC__) && defined(__x86_64__)
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static __inline__ Uint32 SDL_Swap32(Uint32 x)
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{
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	__asm__("bswapl %0" : "=r" (x) : "0" (x));
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	return x;
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}
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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static __inline__ Uint32 SDL_Swap32(Uint32 x)
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{
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	Uint32 result;
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	__asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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	__asm__("rlwimi %0,%2,8,8,15"   : "=&r" (result) : "0" (result),    "r" (x));
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	__asm__("rlwimi %0,%2,24,0,7"   : "=&r" (result) : "0" (result),    "r" (x));
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	return result;
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}
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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static __inline__ Uint32 SDL_Swap32(Uint32 x)
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{
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   117
	__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) :  "0" (x) : "cc");
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   118
	return x;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   119
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   120
#else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   121
static __inline__ Uint32 SDL_Swap32(Uint32 x) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   122
	return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   123
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
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   124
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   125
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
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   126
#ifdef SDL_HAS_64BIT_TYPE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   127
#if defined(__GNUC__) && defined(__i386__) && \
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   128
   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   129
static __inline__ Uint64 SDL_Swap64(Uint64 x)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   130
{
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   131
	union { 
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   132
		struct { Uint32 a,b; } s;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   133
		Uint64 u;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   134
	} v;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   135
	v.u = x;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   136
	__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   137
	        : "=r" (v.s.a), "=r" (v.s.b) 
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   138
	        : "0" (v.s.a), "1" (v.s.b)); 
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   139
	return v.u;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   140
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   141
#elif defined(__GNUC__) && defined(__x86_64__)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   142
static __inline__ Uint64 SDL_Swap64(Uint64 x)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   143
{
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   144
	__asm__("bswapq %0" : "=r" (x) : "0" (x));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   145
	return x;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   146
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   147
#else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   148
static __inline__ Uint64 SDL_Swap64(Uint64 x)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   149
{
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   150
	Uint32 hi, lo;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   151
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   152
	/* Separate into high and low 32-bit values and swap them */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   153
	lo = (Uint32)(x&0xFFFFFFFF);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   154
	x >>= 32;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   155
	hi = (Uint32)(x&0xFFFFFFFF);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   156
	x = SDL_Swap32(lo);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   157
	x <<= 32;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   158
	x |= SDL_Swap32(hi);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   159
	return(x);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   160
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   161
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   162
#else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   163
/* This is mainly to keep compilers from complaining in SDL code.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   164
   If there is no real 64-bit datatype, then compilers will complain about
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   165
   the fake 64-bit datatype that SDL provides when it compiles user code.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   166
*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   167
#define SDL_Swap64(X)	(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   168
#endif /* SDL_HAS_64BIT_TYPE */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   169
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   170
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   171
/* Byteswap item from the specified endianness to the native endianness */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   172
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   173
#define SDL_SwapLE16(X)	(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   174
#define SDL_SwapLE32(X)	(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   175
#define SDL_SwapLE64(X)	(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   176
#define SDL_SwapBE16(X)	SDL_Swap16(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   177
#define SDL_SwapBE32(X)	SDL_Swap32(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   178
#define SDL_SwapBE64(X)	SDL_Swap64(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   179
#else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   180
#define SDL_SwapLE16(X)	SDL_Swap16(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   181
#define SDL_SwapLE32(X)	SDL_Swap32(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   182
#define SDL_SwapLE64(X)	SDL_Swap64(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   183
#define SDL_SwapBE16(X)	(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   184
#define SDL_SwapBE32(X)	(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   185
#define SDL_SwapBE64(X)	(X)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   186
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   187
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   188
/* Ends C function definitions when using C++ */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   189
#ifdef __cplusplus
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   190
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   191
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   192
#include "close_code.h"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   193
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   194
#endif /* _SDL_endian_h */