Developer Reference

  • 2021
  • 03/26/2021
  • Public Content
Contents

Sub

Performs element by element subtraction of one vector from another.

Syntax

IppStatus ippsSub_32f_A24 (const Ipp32f*
pSrc1
, const Ipp32f*
pSrc2
, Ipp32f*
pDst
, Ipp32s
len
);
IppStatus ippsSub_64f_A53 (const Ipp64f*
pSrc1
, const Ipp64f*
pSrc2
, Ipp64f*
pDst
, Ipp32s
len
);
IppStatus ippsSub_32fc_A24 (const Ipp32fc*
pSrc1
, const Ipp32fc*
pSrc2
, Ipp32fc*
pDst
, Ipp32s
len
);
IppStatus ippsSub_64fc_A53 (const Ipp64fc*
pSrc1
, const Ipp64fc*
pSrc2
, Ipp64fc*
pDst
, Ipp32s
len
);
Include Files
ippvm.h
Domain Dependencies
Headers:
ippcore.h
Libraries:
ippcore.lib
Parameters
pSrc1
Pointer to the first source vector.
pSrc2
Pointer to the second source vector.
pDst
Pointer to the destination vector.
len
Number of elements in the vectors.
Description
This function performs element by element subtraction of the vector
pSrc2
from the vector
pSrc1
, and stores the result in the corresponding element of the vector
pDst
.
For single precision data:
function flavors
ippsSub_32f_A24
and
ippsSub_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 flavors
ippsSub_64f_A53
and
ippsSub_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]) - (
pSrc2
[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
ippsSub
.
IppStatus ippsSub_32f_A24_sample(void)
{
const Ipp32f x1[4] = {+4.885, -0.543, -3.809, -4.953};
const Ipp32f x2[4] = {-0.543, -3.809, -4.953, +4.885};
Ipp32f y[4];
IppStatus st = ippsSub_32f_A24( x1, x2, y, 4 );
printf(" ippsSub_32f_A24:\n");
printf(" x1 = %+.3f %+.3f %+.3f %+.3f \n", x1[0], x1[1], x1[2], x1[3]);
printf(" x2 = %+.3f %+.3f %+.3f %+.3f \n", x2[0], x2[1], x2[2], x2[3]);
printf(" y = %+.3f %+.3f %+.3f %+.3f \n", y[0], y[1], y[2], y[3]);
return st;
}
Output results:
ippsSub_32f_A24:
x1 = +4.885 -0.543 -3.809 -4.953
x2 = -0.543 -3.809 -4.953 +4.885
y = +5.428 +3.266 +1.144 -9.838

Product and Performance Information

1

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