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Add MOVBE support 

MOVBE is a modest gain over BSWAP. Though its guarded by CRYPTOPP_MOVBE_AVAILABLE, we cannot detect availability with a preprocessor macro. That is, GCC does not provide __MOVBE__ or similar. It has to be enabled manually
pull/378/head
Jeffrey Walton 2017-01-24 04:26:00 -05:00
parent 3dbf6e785c
commit d4c247a1fd
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GPG Key ID: B36AB348921B1838
1 changed files with 12 additions and 3 deletions
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15
misc.h
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@ -1724,7 +1724,10 @@ inline byte ByteReverse(byte value)
//! \details ByteReverse calls bswap if available. Otherwise the function performs a 8-bit rotate on the word16 //! \details ByteReverse calls bswap if available. Otherwise the function performs a 8-bit rotate on the word16
inline word16 ByteReverse(word16 value) inline word16 ByteReverse(word16 value)
{ {
#ifdef CRYPTOPP_BYTESWAP_AVAILABLE #if defined(CRYPTOPP_X86_ASM_AVAILABLE) && defined(CRYPTOPP_MOVBE_AVAILABLE)
__asm__ ("movbe %1, %0" : "=m" (value) : "q" (value));
return value;
#elif defined(CRYPTOPP_BYTESWAP_AVAILABLE)
return bswap_16(value); return bswap_16(value);
#elif (_MSC_VER >= 1400) || (defined(_MSC_VER) && !defined(_DLL)) #elif (_MSC_VER >= 1400) || (defined(_MSC_VER) && !defined(_DLL))
return _byteswap_ushort(value); return _byteswap_ushort(value);
@ -1739,7 +1742,10 @@ inline word16 ByteReverse(word16 value)
//! \details ByteReverse calls bswap if available. Otherwise the function uses a combination of rotates on the word32 //! \details ByteReverse calls bswap if available. Otherwise the function uses a combination of rotates on the word32
inline word32 ByteReverse(word32 value) inline word32 ByteReverse(word32 value)
{ {
#if defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE) #if defined(CRYPTOPP_X86_ASM_AVAILABLE) && defined(CRYPTOPP_MOVBE_AVAILABLE)
__asm__ ("movbe %1, %0" : "=m" (value) : "q" (value));
return value;
#elif defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE)
__asm__ ("bswap %0" : "=r" (value) : "0" (value)); __asm__ ("bswap %0" : "=r" (value) : "0" (value));
return value; return value;
#elif defined(CRYPTOPP_BYTESWAP_AVAILABLE) #elif defined(CRYPTOPP_BYTESWAP_AVAILABLE)
@ -1764,7 +1770,10 @@ inline word32 ByteReverse(word32 value)
//! \details ByteReverse calls bswap if available. Otherwise the function uses a combination of rotates on the word64 //! \details ByteReverse calls bswap if available. Otherwise the function uses a combination of rotates on the word64
inline word64 ByteReverse(word64 value) inline word64 ByteReverse(word64 value)
{ {
#if defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE) && defined(__x86_64__) #if defined(CRYPTOPP_X86_ASM_AVAILABLE) && defined(CRYPTOPP_MOVBE_AVAILABLE) && defined(__x86_64__)
__asm__ ("movbe %1, %0" : "=m" (value) : "q" (value));
return value;
#elif defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE) && defined(__x86_64__)
__asm__ ("bswap %0" : "=r" (value) : "0" (value)); __asm__ ("bswap %0" : "=r" (value) : "0" (value));
return value; return value;
#elif defined(CRYPTOPP_BYTESWAP_AVAILABLE) #elif defined(CRYPTOPP_BYTESWAP_AVAILABLE)