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Added inline byte swapping code for other architectures

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40850
This commit is contained in:
Sam Lantinga 2004-02-23 06:09:21 +00:00
parent 35fe23a353
commit 17216decbc
1 changed files with 71 additions and 23 deletions
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94
include/SDL_endian.h
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@ -59,53 +59,101 @@ extern "C" {
static for compilers that do not support inline functions, this
header should only be included in files that actually use them.
*/
#if defined(__GNUC__) && defined(i386)
static __inline__ Uint16 SDL_Swap16(Uint16 D)
#if defined(__GNUC__) && defined(__i386__)
static __inline__ Uint16 SDL_Swap16(Uint16 x)
{
__asm__("xchgb %b0,%h0" : "=q" (D) : "0" (D));
return D;
__asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
return x;
}
#elif defined(__GNUC__) && defined(__x86_64__)
static __inline__ Uint16 SDL_Swap16(Uint16 x)
{
__asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
return x;
}
#elif defined(__GNUC__) && defined(__powerpc__)
static __inline__ Uint16 SDL_Swap16(Uint16 x)
{
Uint16 result;
__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
return result;
}
#else
static __inline__ Uint16 SDL_Swap16(Uint16 D) {
return((D<<8)|(D>>8));
static __inline__ Uint16 SDL_Swap16(Uint16 x) {
return((x<<8)|(x>>8));
}
#endif
#if defined(__GNUC__) && defined(i386)
static __inline__ Uint32 SDL_Swap32(Uint32 D)
#if defined(__GNUC__) && defined(__i386__)
static __inline__ Uint32 SDL_Swap32(Uint32 x)
{
__asm__("bswap %0" : "=r" (D) : "0" (D));
return D;
__asm__("bswap %0" : "=r" (x) : "0" (x));
return x;
}
#elif defined(__GNUC__) && defined(__x86_64__)
static __inline__ Uint32 SDL_Swap32(Uint32 x)
{
__asm__("bswapl %0" : "=r" (x) : "0" (x));
return x;
}
#elif defined(__GNUC__) && defined(__powerpc__)
static __inline__ Uint32 SDL_Swap32(Uint32 x)
{
Uint32 result;
__asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
__asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
__asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
return result;
}
#else
static __inline__ Uint32 SDL_Swap32(Uint32 D) {
return((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
static __inline__ Uint32 SDL_Swap32(Uint32 x) {
return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
}
#endif
#ifdef SDL_HAS_64BIT_TYPE
#ifndef SDL_Swap64
static __inline__ Uint64 SDL_Swap64(Uint64 val) {
#if defined(__GNUC__) && defined(__i386__)
static __inline__ Uint64 SDL_Swap64(Uint64 x)
{
union {
struct { Uint32 a,b; } s;
Uint64 u;
} v;
v.u = x;
__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
: "=r" (v.s.a), "=r" (v.s.b)
: "0" (v.s.a), "1" (v.s.b));
return v.u;
}
#elif defined(__GNUC__) && defined(__x86_64__)
static __inline__ Uint64 SDL_Swap64(Uint64 x)
{
__asm__("bswapq %0" : "=r" (x) : "0" (x));
return x;
}
#else
static __inline__ Uint64 SDL_Swap64(Uint64 x)
{
Uint32 hi, lo;
/* Separate into high and low 32-bit values and swap them */
lo = (Uint32)(val&0xFFFFFFFF);
val >>= 32;
hi = (Uint32)(val&0xFFFFFFFF);
val = SDL_Swap32(lo);
val <<= 32;
val |= SDL_Swap32(hi);
return(val);
lo = (Uint32)(x&0xFFFFFFFF);
x >>= 32;
hi = (Uint32)(x&0xFFFFFFFF);
x = SDL_Swap32(lo);
x <<= 32;
x |= SDL_Swap32(hi);
return(x);
}
#endif
#else
#ifndef SDL_Swap64
/* This is mainly to keep compilers from complaining in SDL code.
If there is no real 64-bit datatype, then compilers will complain about
the fake 64-bit datatype that SDL provides when it compiles user code.
*/
#define SDL_Swap64(X) (X)
#endif
#endif /* SDL_HAS_64BIT_TYPE */