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Provide body for VectorStore 

Calling VectorStoreBE inside VectorStore slowed us down by up to 0.5 cpb on LE systems.
Update documentation for VectorShiftLeft
pull/484/merge
Jeffrey Walton 2017-09-22 19:37:54 -04:00
parent d5c12191b3
commit bb5be2979e
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GPG Key ID: B36AB348921B1838
1 changed files with 29 additions and 7 deletions
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36
ppc-crypto.h
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@ -238,7 +238,16 @@ inline void VectorStoreBE(const T& src, int off, uint8_t dest[16])
template<class T>
inline void VectorStore(const T& src, byte dest[16])
{
VectorStoreBE((uint8x16_p8)src, (uint8_t*)dest);
// Do not call VectorStoreBE. It slows us down by about 0.5 cpb on LE.
#if defined(CRYPTOPP_XLC_VERSION)
vec_xst_be((uint8x16_p8)src, 0, (uint8_t*)dest);
#else
# if defined(IS_LITTLE_ENDIAN)
vec_vsx_st(Reverse((uint8x16_p8)src), 0, (uint8_t*)dest);
# else
vec_vsx_st((uint8x16_p8)src, 0, (uint8_t*)dest);
# endif
#endif
}
//! \brief Stores a vector to a byte array
@ -253,7 +262,16 @@ inline void VectorStore(const T& src, byte dest[16])
template<class T>
inline void VectorStore(const T& src, int off, byte dest[16])
{
VectorStoreBE((uint8x16_p8)src, off, (uint8_t*)dest);
// Do not call VectorStoreBE. It slows us down by about 0.5 cpb on LE.
#if defined(CRYPTOPP_XLC_VERSION)
vec_xst_be((uint8x16_p8)src, off, (uint8_t*)dest);
#else
# if defined(IS_LITTLE_ENDIAN)
vec_vsx_st(Reverse((uint8x16_p8)src), off, (uint8_t*)dest);
# else
vec_vsx_st((uint8x16_p8)src, off, (uint8_t*)dest);
# endif
#endif
}
//! \brief Permutes two vectors
@ -302,18 +320,22 @@ inline T1 VectorAdd(const T1& vec1, const T2& vec2)
}
//! \brief Shift two vectors left
//! \tparam C shift byte count
//! \tparam T1 a vector type
//! \tparam T2 a vector type
//! \param vec1 the first vector
//! \param vec2 the second vector
//! \details VectorShiftLeft returns a new vector from vec1 and vec2.
//! Both vec1 and vec2 are cast to uint8x16_p8. The return vector
//! is the same type as vec1.
//! \note VectorShiftLeft handles the difference between big endian
//! \details VectorShiftLeft() concatenates vec1 and vec2 and returns a
//! new vector after shifting the concatenation by the specified number
//! of bytes. Both vec1 and vec2 are cast to uint8x16_p8. The return
//! vector is the same type as vec1.
//! \note VectorShiftLeft() handles the difference between big endian
//! and little endian internally. Call the function as if on a big
//! endian machine.
//! \sa <A HREF="https://stackoverflow.com/q/46341923/608639">Is vec_sld
//! endian sensitive?</A> on Stack Overflow
//! \since Crypto++ 6.0
template <int C, class T1, class T2>
template <unsigned int C, class T1, class T2>
inline T1 VectorShiftLeft(const T1& vec1, const T2& vec2)
{
#if defined(IS_LITTLE_ENDIAN)