Intel® Integrated Performance Primitives Developer Reference

Developer Reference

  • 2021
  • 01/15/2021
  • Public Content
Contents

Abs

Computes the absolute value of vector elements.

Syntax

IppStatus ippsAbs_32f_A24 (const Ipp32f*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsAbs_64f_A53 (const Ipp64f*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsAbs_32fc_A11 (const Ipp32fc*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsAbs_32fc_A21 (const Ipp32fc*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsAbs_32fc_A24 (const Ipp32fc*
pSrc
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsAbs_64fc_A26 (const Ipp64fc*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsAbs_64fc_A50 (const Ipp64fc*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsAbs_64fc_A53 (const Ipp64fc*
pSrc
, Ipp64f*
pDst
, Ipp32s
len
);
Include Files
ippvm.h
Domain Dependencies
Headers:
ippcore.h
Libraries:
ippcore.lib
Parameters
pSrc
Pointer to the source vector.
pDst
Pointer to the destination vector.
len
Number of elements in the vectors.
Description
This function computes the absolute value of the vector
pSrc
 elements and stores the result in the corresponding element of the vector
pDst
.
For single precision data:
function flavor
ippsAbs_32fc_A11
 guarantees 11 correctly rounded bits of significand, or at least 3 exact decimal digits;
function flavor
ippsAbs_32fc_A21
 guarantees 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;
function flavors
ippsAbs_32f_A24
 and
ippsAbs_32fc_A24
 guarantee 24 correctly rounded bits of significand, including the implied bit, with the maximum guaranteed error within 1 ulp.
For double precision data:
function flavor
ippsAbs_64fc_A26
 guarantees 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;
function flavor
ippsAbs_64fc_A50
 guarantees 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;
function flavors
ippsAbs_64f_A53
 and
ippsAbs_64fc_A53
 guarantee 53 correctly rounded bits of significand, including the implied bit, with the maximum guaranteed error within 1 ulp.
The computation is performed as follows:
pDst
[n] = |
pSrc1
[n]|
,
0 ≤ n <
len
.
Return Values
ippStsNoErr
Indicates no error.
ippStsNullPtrErr
Indicates an error when
pSrc1
,
pSrc2
 or
pDst
 pointer is
NULL
.
ippStsSizeErr
Indicates an error when
len
 is less than or equal to 0.

Example

The example below shows how to use the function
ippsAbs
.
IppStatus ippsAbs_32fc_A24_sample(void)
{
const Ipp32fc x[2] = {{+2.885,-1.809}, {-0.543,-2.809}};
Ipp32fc  y[2];
	IppStatus st = ippsAbs_32fc_A24( x, y, 2 );
	printf(" ippsAbs_32fc_A24:\n"); 
	printf(" x = %+.3f%+.3f*i   %+.3f%+.3f*i \n", x[0].re, x[0].im, x[1].re, x[1].im);
	printf(" y = %+.3f          %+.3f%       \n", y[0],             y[1]);
	return st;
}
Output results:
 ippsAbs_32fc_A24:
  x = +2.885-1.809*i   -0.543-2.809*i
  y = +3.405           +2.861

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.