src/util/compiler.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * \file compiler.h
  29  * Compiler-related stuff.
  30  */
  31
  32
  33 #ifndef COMPILER_H
  34 #define COMPILER_H
  35
  36
  37 #include <assert.h>
  38
  39 #include "util/macros.h"
  40
  41 #include "c99_compat.h" /* inline, __func__, etc. */
  42
  43
  44 /**
  45  * Either define MESA_BIG_ENDIAN or MESA_LITTLE_ENDIAN, and CPU_TO_LE32.
  46  * Do not use these unless absolutely necessary!
  47  * Try to use a runtime test instead.
  48  * For now, only used by some DRI hardware drivers for color/texel packing.
  49  */
  50 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
  51 #if defined(__linux__)
  52 #include <byteswap.h>
  53 #define CPU_TO_LE32( x )        bswap_32( x )
  54 #elif defined(__APPLE__)
  55 #include <CoreFoundation/CFByteOrder.h>
  56 #define CPU_TO_LE32( x )        CFSwapInt32HostToLittle( x )
  57 #elif defined(__OpenBSD__)
  58 #include <sys/types.h>
  59 #define CPU_TO_LE32( x )        htole32( x )
  60 #else /*__linux__ */
  61 #include <sys/endian.h>
  62 #define CPU_TO_LE32( x )        bswap32( x )
  63 #endif /*__linux__*/
  64 #define MESA_BIG_ENDIAN 1
  65 #else
  66 #define CPU_TO_LE32( x )        ( x )
  67 #define MESA_LITTLE_ENDIAN 1
  68 #endif
  69 #define LE32_TO_CPU( x )        CPU_TO_LE32( x )
  70
  71
  72
  73 #define IEEE_ONE 0x3f800000
  74
  75
  76 #endif /* COMPILER_H */