Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 3/22/2024
Public

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Document Table of Contents

MulByConj

Performs element by element multiplication of a vector a element and a conjugated vector b element.

Syntax

IppStatus ippsMulByConj_32fc_A11 (const Ipp32fc* pSrc1, const Ipp32fc* pSrc2, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsMulByConj_32fc_A21 (const Ipp32fc* pSrc1, const Ipp32fc* pSrc2, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsMulByConj_32fc_A24 (const Ipp32fc* pSrc1, const Ipp32fc* pSrc2, Ipp32fc* pDst, Ipp32s len);

IppStatus ippsMulByConj_64fc_A26 (const Ipp64fc* pSrc1, const Ipp64fc* pSrc2, Ipp64fc* pDst, Ipp32s len);

IppStatus ippsMulByConj_64fc_A50 (const Ipp64fc* pSrc1, const Ipp64fc* pSrc2, Ipp64fc* pDst, Ipp32s len);

IppStatus ippsMulByConj_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 multiplication of the vector pSrc1 and the conjugated vector pSrc2, and stores the result in the corresponding element of the vector pDst.

For single precision data:

function flavor ippsMulByConj_32fc_A11 guarantees 11 correctly rounded bits of significand, or at least 3 exact decimal digits;

function flavor ippsMulByConj_32fc_A21 guarantees 21 correctly rounded bits of significand, or 4 ulps, or about 6 exact decimal digits;

function flavor ippsMulByConj_32fc_A24 guarantees 24 correctly rounded bits of significand, including the implied bit, with the maximum guaranteed error within 1 ulp.

For double precision data:

function flavor ippsMulByConj_64fc_A26 guarantees 26 correctly rounded bits of significand, or 6.7E+7 ulps, or approximately 8 exact decimal digits;

function flavor ippsMulByConj_64fc_A50 guarantees 50 correctly rounded bits of significand, or 4 ulps, or approximately 15 exact decimal digits;

function flavor ippsMulByConj_64fc_A53 guarantees 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] x CONJ(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 ippsMulByConj.

IppStatus ippsMulByConj_32fc_A24_sample(void) {
	const Ipp32fc x1[4] = {{+2.885,-1.809}, {-0.543,-2.809}};
	const Ipp32fc x2[4] = {{-0.543,-2.809}, {-1.809,-2.809}};
	Ipp32fc  y[2];
	IppStatus st = ippsMulByConj_32fc_A24( x1, x2, y, 2 );
	
	printf(" ippsMulByConj_32fc_A24:\n");
	printf(" x1 = %+.3f%+.3f*i   %+.3f%+.3f*i \n", x1[0].re, x1[0].im, x1[1].re, x1[1].im);
	printf(" x2 = %+.3f%+.3f*i   %+.3f%+.3f*i \n", x2[0].re, x2[0].im, x2[1].re, x2[1].im);
	printf(" y  = %+.3f%+.3f*i   %+.3f%+.3f*i \n",  y[0].re,  y[0].im,  y[1].re,  y[1].im);
	return st;
}

Output:

 
ippsMulByConj_32fc_A24:
x1 = +2.885-1.809*i   -0.543-2.809*i
x2 = -0.543-2.809*i   -1.809-2.809*i
y = +3.515+9.086*i   +8.873+3.556*i