mirror
/
OpenTTD
mirror of https://github.com/OpenTTD/OpenTTD
1
0
Fork 0
Code Issues

(svn r14232) -Codechange: use builtin for byte swapping for gcc >= 4.3

release/0.7
smatz 2008-09-02 21:11:48 +00:00
parent a482f0053d
commit c620d5e5f0
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/core/bitmath_func.hpp
View File

@ -318,7 +318,12 @@ static FORCEINLINE T ROR(const T x, const uint8 n)
*/ */
static FORCEINLINE uint32 BSWAP32(uint32 x) static FORCEINLINE uint32 BSWAP32(uint32 x)
{ {
#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && __GNUC_MINOR__ >= 3))
/* GCC >= 4.3 provides a builtin, resulting in faster code */
return (uint32)__builtin_bswap32((int32)x);
#else
return ((x >> 24) & 0xFF) | ((x >> 8) & 0xFF00) | ((x << 8) & 0xFF0000) | ((x << 24) & 0xFF000000); return ((x >> 24) & 0xFF) | ((x >> 8) & 0xFF00) | ((x << 8) & 0xFF0000) | ((x << 24) & 0xFF000000);
#endif /* defined(__GNUC__) */
} }
/** /**