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| author | smatz <smatz@openttd.org> | 2008-09-02 21:11:48 +0000 |
|---|---|---|
| committer | smatz <smatz@openttd.org> | 2008-09-02 21:11:48 +0000 |
| commit | c620d5e5f066e62cf23197d16e40a07c41e2d9f8 (patch) | |
| tree | a05da0e1f818ddb1f99e7d038379fa2c9e08b1d5 /src | |
| parent | a482f0053d4920359b7a010fbc47fcb3c5b0f13b (diff) | |
| download | openttd-c620d5e5f066e62cf23197d16e40a07c41e2d9f8.tar.xz | |
(svn r14232) -Codechange: use builtin for byte swapping for gcc >= 4.3
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/bitmath_func.hpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/core/bitmath_func.hpp b/src/core/bitmath_func.hpp index 6abcdcb80..27168e821 100644 --- a/src/core/bitmath_func.hpp +++ b/src/core/bitmath_func.hpp @@ -318,7 +318,12 @@ static FORCEINLINE T ROR(const T x, const uint8 n) */ 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); +#endif /* defined(__GNUC__) */ } /** |