Developer Reference for Intel® Integrated Performance Primitives 2018
Computes e to the power of each element of a vector.
IppStatus ippsExp_32f(const Ipp32f* pSrc, Ipp32f* pDst, int len);
IppStatus ippsExp_64f(const Ipp64f* pSrc, Ipp64f* pDst, int len);
IppStatus ippsExp_32f_I(Ipp32f* pSrcDst, int len);
IppStatus ippsExp_64f_I(Ipp64f* pSrcDst, int len);
IppStatus ippsExp_16s_Sfs(const Ipp16s* pSrc, Ipp16s* pDst, int len, int scaleFactor);
IppStatus ippsExp_32s_Sfs(const Ipp32s* pSrc, Ipp32s* pDst, int len, int scaleFactor);
IppStatus ippsExp_16s_ISfs(Ipp16s* pSrcDst, int len, int scaleFactor);
IppStatus ippsExp_32s_ISfs(Ipp32s* pSrcDst, int len, int scaleFactor);
ipps.h
Headers: ippcore.h, ippvm.h
Libraries: ippcore.lib, ippvm.lib
pSrc |
Pointer to the source vector. |
pDst |
Pointer to the destination vector. |
pSrcDst |
Pointer to the source and destination vector pSrcDst for the in-place operation. |
len |
Number of elements in the vector |
scaleFactor |
Scale factor, refer to Integer Scaling. |
This function computes the exponential function of each element of the vector pSrc, and stores the result in pDst.
The computation is performed as follows:
pDst[n] = epSrc[n]
The in-place flavors of ippsExp compute the exponential function of each element of the vector pSrcDst and store the result in pSrcDst.
The computation is performed as follows:
pSrcDst[n] = epSrcDst[n]
When an overflow occurs, the function continues operation with the corresponding result value (see appendix A "Handling of Special Cases" for more information).
When computing the exponent of an integer number, the output result can exceed the data range and become saturated. The scaling retains the output data range but results in precision loss in low-order bits. The function ippsExp_32f64f computes the output result in a higher precision data range.
For the functions ippsExp and ippsLn the result is rounded to the nearest integer after scaling.
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error when the pSrc, pDst, or pSrcDst pointer is NULL. |
ippStsSizeErr |
Indicates an error when len is less than or equal to zero. |