Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

Exp

Computes
e
to the power of each element of a vector.

Syntax

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
);
Include Files
ipps.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
Libraries:
ippcore.lib
,
ippvm.lib
Parameters
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.
Description
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] = e
pSrc
[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] = e
pSrcDst
[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.
Application Notes
For the functions
ippsExp
and
ippsLn
the result is rounded to the nearest integer after scaling.
Return Values
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.

Example

Exp
:
/******************************************************************************* * Copyright 2015-2020 Intel Corporation. * * This software and the related documents are Intel copyrighted materials, and * your use of them is governed by the express license under which they were * provided to you (License). Unless the License provides otherwise, you may not * use, modify, copy, publish, distribute, disclose or transmit this software or * the related documents without Intel's prior written permission. * * This software and the related documents are provided as is, with no express * or implied warranties, other than those that are expressly stated in the * License. *******************************************************************************/ #include <stdio.h> #include "ipp.h" /* Next two defines are created to simplify code reading and understanding */ #define EXIT_MAIN exitLine: /* Label for Exit */ #define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */ /* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */ int main() { int len = 32; int i; Ipp16s *pSrc = ippsMalloc_16s(len * sizeof(Ipp16s)); Ipp16s *pDst = ippsMalloc_16s(len * sizeof(Ipp16s)); IppStatus status; int scale = 0; //without scaling printf("\n\nSource vector\n"); for (i = 0; i < len; i++) { pSrc[i] = 2 + i; printf("%d; ", pSrc[i]); } check_sts(status = ippsExp_16s_Sfs(pSrc, pDst, len, scale)); printf("\n\nResult\n"); for (i = 0; i < len; i++) printf("%d; ", pDst[i]); printf("\n\n"); EXIT_MAIN ippsFree(pSrc); ippsFree(pDst); printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status)); return (int)status; }
Exp_I
:
/******************************************************************************* * Copyright 2015-2020 Intel Corporation. * * This software and the related documents are Intel copyrighted materials, and * your use of them is governed by the express license under which they were * provided to you (License). Unless the License provides otherwise, you may not * use, modify, copy, publish, distribute, disclose or transmit this software or * the related documents without Intel's prior written permission. * * This software and the related documents are provided as is, with no express * or implied warranties, other than those that are expressly stated in the * License. *******************************************************************************/ #include <stdio.h> #include "ipp.h" /* Next two defines are created to simplify code reading and understanding */ #define EXIT_MAIN exitLine: /* Label for Exit */ #define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */ /* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */ int main() { int len = 32; int i; Ipp16s *pSrcDst = ippsMalloc_16s(len * sizeof(Ipp16s)); IppStatus status; int scale = 0; //without scaling printf("\n\nSource vector\n"); for (i = 0; i < len; i++) { pSrcDst[i] = 2 + i; printf("%d; ", pSrcDst[i]); } check_sts(status = ippsExp_16s_ISfs(pSrcDst, len, scale)); printf("\n\nResult\n"); for (i = 0; i < len; i++) printf("%d; ", pSrcDst[i]); printf("\n\n"); EXIT_MAIN ippsFree(pSrcDst); printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status)); return (int)status; }

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804