diff options
| author | lloyd <[email protected]> | 2008-10-12 05:45:46 +0000 |
|---|---|---|
| committer | lloyd <[email protected]> | 2008-10-12 05:45:46 +0000 |
| commit | b90900b6dc19d709b71e87b9afc02b5877896d5c (patch) | |
| tree | fc6fb442422ae60d7178919dd7fe73f19cb5e7d5 /src/utils | |
| parent | cce13a5ffcfa5d248eb9ff69ff2ecd60794517ff (diff) | |
Add an implementation of bswap for Visual C++ in x86 inline asm,
written by Yves Jerschow (sent to me in a personal email 2007-10-23).
Diffstat (limited to 'src/utils')
| -rw-r--r-- | src/utils/bswap.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/utils/bswap.h b/src/utils/bswap.h index b322b9d9b..c1f03c9fd 100644 --- a/src/utils/bswap.h +++ b/src/utils/bswap.h @@ -1,6 +1,7 @@ /************************************************* * Byte Swapping Operations Header File * * (C) 1999-2008 Jack Lloyd * +* (C) 2007 Yves Jerschow * *************************************************/ #ifndef BOTAN_BYTE_SWAP_H__ @@ -24,9 +25,17 @@ inline u32bit reverse_bytes(u32bit input) #if BOTAN_COMPILER_HAS_GCC_INLINE_ASM && \ (defined(BOTAN_TARGET_ARCH_IS_IA32) || defined(BOTAN_TARGET_ARCH_IS_AMD64)) + /* GCC-style inline assembly for x86 or x86-64 */ asm("bswapl %0" : "=r" (input) : "0" (input)); return input; + +#elif defined(_MSC_VER) && defined(BOTAN_TARGER_ARCH_IS_IA32) + /* Visual C++ inline asm for 32-bit x86, by Yves Jerschow */ + __asm mov eax, x; + __asm bswap eax; + #else + /* Generic implementation */ input = ((input & 0xFF00FF00) >> 8) | ((input & 0x00FF00FF) << 8); return rotate_left(input, 16); #endif |