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133 lines
9.6 KiB
133 lines
9.6 KiB
/* ======================================================================== */
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/* TEXAS INSTRUMENTS, INC. */
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/* */
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/* DSPLIB DSP Signal Processing Library */
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/* */
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/* Release: Revision 1.04b */
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/* CVS Revision: 1.10 Sun Sep 29 03:32:20 2002 (UTC) */
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/* Snapshot date: 23-Oct-2003 */
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/* */
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/* This library contains proprietary intellectual property of Texas */
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/* Instruments, Inc. The library and its source code are protected by */
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/* various copyrights, and portions may also be protected by patents or */
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/* other legal protections. */
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/* */
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/* This software is licensed for use with Texas Instruments TMS320 */
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/* family DSPs. This license was provided to you prior to installing */
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/* the software. You may review this license by consulting the file */
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/* TI_license.PDF which accompanies the files in this library. */
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/* ------------------------------------------------------------------------ */
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/* Copyright (C) 2003 Texas Instruments, Incorporated. */
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/* All Rights Reserved. */
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/* ======================================================================== */
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/* ======================================================================== */
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/* Assembler compatibility shim for assembling 4.30 and later code on */
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/* tools prior to 4.30. */
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/* ======================================================================== */
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/* ======================================================================== */
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/* End of assembler compatibility shim. */
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/* ======================================================================== */
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/* ======================================================================== */
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/* */
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/* TEXAS INSTRUMENTS, INC. */
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/* */
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/* NAME */
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/* DSP_dotp_sqr */
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/* */
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/* REVISION DATE */
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/* 29-Mar-2002 */
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/* */
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/* USAGE */
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/* This routine is C callable, and can be called as: */
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/* */
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/* int DSP_dotp_sqr */
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/* ( */
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/* int G, // Sum-of-y-squared initial value // */
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/* const short *x, // First input array. // */
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/* const short *y, // Second input array. // */
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/* int *restrict r, // Accumulation of x[] * y[]. // */
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/* int nx // Length of the input vector. // */
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/* ); */
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/* */
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/* DESCRIPTION */
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/* This routine computes the dot product of x[] and y[] arrays, */
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/* adding it to the value in the location pointed to by 'd'. */
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/* */
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/* Additionally, it computes the sum of the squares of the terms */
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/* in the y[] array, adding it to the argument G. The final value */
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/* of G is given as the return value of the function. This value */
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/* is used by the VSELP vocoder. */
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/* */
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/* The following C code is an implementation of the algorithm */
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/* without restrictions. Optimized implementations may add */
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/* restrictions as noted under the heading "ASSUMPTIONS." */
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/* */
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/* int DSP_dotp_sqr */
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/* ( */
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/* int G, // Sum-of-y-squared initial value // */
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/* const short *x, // First input array. // */
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/* const short *y, // Second input array. // */
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/* int *restrict r, // Accumulation of x[] * y[]. // */
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/* int nx // Length of the input vector. // */
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/* ) */
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/* { */
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/* int i; */
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/* */
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/* for (i = 0; i < nx; i++) */
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/* { */
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/* *r += x[i] * y[i]; */
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/* G += y[i] * y[i]; */
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/* } */
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/* */
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/* return G; */
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/* } */
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/* */
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/* ASSUMPTIONS */
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/* nx >= 12, nx % 4 == 0. */
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/* */
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/* TECHNIQUES */
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/* Unrolled 4 times to maximize multiplier utilization. */
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/* */
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/* NOTES */
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/* This function is interrupt tolerant, but not interruptible. */
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/* It locks out interrupts for its entire duration. */
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/* */
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/* MEMORY NOTE */
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/* Non-aligned accesses are used, so there are no alignment */
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/* constraints. Also, as a result, no bank conflicts should occur. */
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/* This code is ENDIAN NEUTRAL. */
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/* */
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/* CYCLES */
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/* cycles = nx/2 + 21. */
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/* For nx == 16, cycles == 29. */
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/* For nx == 100, cycles == 71. */
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/* */
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/* CODESIZE */
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/* 152 bytes. */
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/* */
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/* SOURCE */
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/* DSPLIB. */
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/* */
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/* ------------------------------------------------------------------------ */
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/* Copyright (c) 2003 Texas Instruments, Incorporated. */
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/* All Rights Reserved. */
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/* ======================================================================== */
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#ifndef DSP_DOTP_SQR_H_
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#define DSP_DOTP_SQR_H_ 1
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int DSP_dotp_sqr
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(
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int G, /* Sum-of-y-squared initial value */
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const short *x, /* First input array. */
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const short *y, /* Second input array. */
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int *restrict r, /* Accumulation of x[] * y[]. */
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int nx /* Length of the input vector. */
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);
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#endif
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/* ======================================================================== */
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/* End of file: dsp_dotp_sqr.h */
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/* ------------------------------------------------------------------------ */
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/* Copyright (c) 2003 Texas Instruments, Incorporated. */
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/* All Rights Reserved. */
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/* ======================================================================== */
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