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(retro_endianess.h) Small update

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Higor Eurípedes 2015-06-09 19:56:59 -03:00
parent 05e6b9965e
commit 47af2e6d1c
1 changed files with 22 additions and 28 deletions
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46
libretro-common/include/retro_endianness.h
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@ -26,17 +26,24 @@
#include <retro_inline.h>
#include <stdint.h>
#if defined(__llvm__) || (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 403)
#define SWAP16 __builtin_bswap16
#define SWAP32 __builtin_bswap32
#elif if defined(_MSC_VER)
#define SWAP16 _byteswap_ushort
#define SWAP32 _byteswap_ulong
#else
#define SWAP16(x) ((uint16_t)( \
(((uint16_t)(x) & 0x00ff) << 8) | \
(((uint16_t)(x) & 0xff00) >> 8) \
))
#define SWAP32(x) ((uint32_t)( \
(((uint32_t)(x) & 0x000000ff) << 24) | \
(((uint32_t)(x) & 0x0000ff00) << 8) | \
(((uint32_t)(x) & 0x00ff0000) >> 8) | \
(((uint32_t)(x) & 0xff000000) >> 24) \
))
#endif
/**
* is_little_endian:
@ -48,6 +55,11 @@
**/
static INLINE uint8_t is_little_endian(void)
{
#if defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
return 1;
#elif defined(MSB_FIRST)
return 0;
#else
union
{
uint16_t x;
@ -56,25 +68,7 @@ static INLINE uint8_t is_little_endian(void)
u.x = 1;
return u.y[0];
}
static INLINE uint32_t swap_little32(uint32_t val)
{
return
(val >> 24)
| ((val >> 8) & 0xFF00)
| ((val << 8) & 0xFF0000)
| (val << 24);
}
static INLINE uint16_t swap_big16(uint16_t val)
{
return (val >> 8) | (val << 8);
}
static INLINE uint16_t swap_little16(uint16_t val)
{
return (val >> 8) | (val << 8);
#endif
}
/**
@ -90,7 +84,7 @@ static INLINE uint32_t swap_if_big32(uint32_t val)
{
if (is_little_endian())
return val;
return swap_little32(val);
return SWAP32(val);
}
/**
@ -105,7 +99,7 @@ static INLINE uint32_t swap_if_big32(uint32_t val)
static INLINE uint32_t swap_if_little32(uint32_t val)
{
if (is_little_endian())
return swap_little32(val);
return SWAP32(val);
return val;
}
@ -122,7 +116,7 @@ static INLINE uint16_t swap_if_big16(uint16_t val)
{
if (is_little_endian())
return val;
return swap_big16(val);
return SWAP16(val);
}
@ -138,7 +132,7 @@ static INLINE uint16_t swap_if_big16(uint16_t val)
static INLINE uint16_t swap_if_little16(uint16_t val)
{
if (is_little_endian())
return swap_little16(val);
return SWAP16(val);
return val;
}
@ -152,7 +146,7 @@ static INLINE uint16_t swap_if_little16(uint16_t val)
**/
static INLINE void store32be(uint32_t *addr, uint32_t data)
{
*addr = is_little_endian() ? SWAP32(data) : data;
*addr = swap_if_little32(data);
}
/**
@ -165,7 +159,7 @@ static INLINE void store32be(uint32_t *addr, uint32_t data)
**/
static INLINE uint32_t load32be(const uint32_t *addr)
{
return is_little_endian() ? SWAP32(*addr) : *addr;
return swap_if_little32(*addr);
}
#endif