/* ======================================================================== */
/* TEXAS INSTRUMENTS, INC. */
/* */
/* DSPLIB DSP Signal Processing Library */
/* */
/* Release: Version 1.02 */
/* CVS Revision: 1.4 Wed Apr 17 15:49:07 2002 (UTC) */
/* Snapshot date: 18-Apr-2002 */
/* */
/* This library contains proprietary intellectual property of Texas */
/* Instruments, Inc. The library and its source code are protected by */
/* various copyrights, and portions may also be protected by patents or */
/* other legal protections. */
/* */
/* This software is licensed for use with Texas Instruments TMS320 */
/* family DSPs. This license was provided to you prior to installing */
/* the software. You may review this license by consulting the file */
/* TI_license.PDF which accompanies the files in this library. */
/* ------------------------------------------------------------------------ */
/* Copyright (C) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
/* ======================================================================== */
/* */
/* TEXAS INSTRUMENTS, INC. */
/* */
/* NAME */
/* DSP_dotprod */
/* */
/* REVISION DATE */
/* 29-Mar-2002 */
/* */
/* USAGE */
/* This routine is C-callable and can be called as: */
/* */
/* int DSP_dotprod */
/* ( */
/* const short *x, // first input vector // */
/* const short *y, // second input vector // */
/* int nx // number of elements // */
/* ); */
/* */
/* */
/* DESCRIPTION */
/* This routine takes two vectors and calculates their vector */
/* product. The inputs are 16-bit number, and the result is */
/* a 32-bit number. */
/* */
/* This is the C equivalent of the assembly code without restrictions: */
/* Note that the assembly code is hand optimized and restrictions may */
/* apply. */
/* */
/* int DSP_dotprod */
/* ( */
/* const short *x, */
/* const short *y, */
/* int nx */
/* ) */
/* { */
/* int sum = 0, i; */
/* */
/* for (i = 0; i < nx; i++) */
/* sum += x[i] * y[i]; */
/* */
/* return sum; */
/* } */
/* */
/* TECHNIQUES */
/* Load words are used to load two 16-bit values at a time. */
/* The loop is unrolled once. */
/* */
/* ASSUMPTIONS */
/* nx must be a multiple of 2 and greater than 2. */
/* Vectors x and y must be aligned on word boundaries. */
/* */
/* MEMORY NOTE */
/* Vectors x and y should be aligned on opposite memory banks */
/* to avoid memory hits. Example: */
/* #pragma DATA_MEM_BANK(x, 0) */
/* #pragma DATA_MEM_BANK(y, 2) */
/* */
/* NOTES */
/* This code is ENDIAN NEUTRAL. */
/* This code is interrupt-tolerant but not interruptible. */
/* */
/* CYCLES */
/* nx/2 + 12 */
/* For nx = 40: 32 cycles */
/* */
/* CODESIZE */
/* 160 bytes */
/* */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
#ifndef DSP_DOTPROD_H_
#define DSP_DOTPROD_H_ 1
int DSP_dotprod
(
const short *x, /* first input vector */
const short *y, /* second input vector */
int nx /* number of elements */
);
#endif
/* ======================================================================== */
/* End of file: dsp_dotprod.h */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */