;* ======================================================================== *;
;* TEXAS INSTRUMENTS, INC. *;
;* *;
;* DSPLIB DSP Signal Processing Library *;
;* *;
;* Release: Version 1.02 *;
;* CVS Revision: 1.4 Fri Mar 29 20:07:39 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_dotp_sqr *
* *
* REVISION DATE *
* 29-Mar-2002 *
* *
* USAGE *
* This routine is C callable, and can be called as: *
* *
* int DSP_dotp_sqr *
* ( *
* int G, /* Sum-of-y-squared initial value */ *
* const short *x, /* First input array. */ *
* const short *y, /* Second input array. */ *
* int *restrict r, /* Accumulation of x[] * y[]. */ *
* int nx /* Length of the input vector. */ *
* ); *
* *
* DESCRIPTION *
* This routine computes the dot product of x[] and y[] arrays, *
* adding it to the value in the location pointed to by 'r'. *
* *
* Additionally, it computes the sum of the squares of the terms *
* in the y[] array, adding it to the argument G. The final value *
* of G is given as the return value of the function. This value *
* is used by the VSELP vocoder. *
* *
* The following C code is an implementation of the algorithm *
* without restrictions. Optimized implementations may add *
* restrictions as noted under the heading "ASSUMPTIONS." *
* *
* int DSP_dotp_sqr *
* ( *
* int G, /* Sum-of-y-squared initial value */ *
* const short *x, /* First input array. */ *
* const short *y, /* Second input array. */ *
* int *restrict r, /* Accumulation of x[] * y[]. */ *
* int nx /* Length of the input vector. */ *
* ) *
* { *
* int i; *
* *
* for (i = 0; i < nx; i++) *
* { *
* *r += x[i] * y[i]; *
* G += y[i] * y[i]; *
* } *
* *
* return G; *
* } *
* *
* ASSUMPTIONS *
* nx >= 12, nx % 4 == 0. *
* *
* TECHNIQUES *
* Unrolled 4 times to maximize multiplier utilization. *
* *
* MEMORY NOTE *
* No bank conflicts occur under any conditions. *
* This code is ENDIAN NEUTRAL. *
* *
* CYCLES *
* nx + 20 *
* *
* CODESIZE *
* 192 bytes. *
* *
* SOURCE *
* DSPLIB. *
* ------------------------------------------------------------------------- *
* Copyright (c) 2002 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *
.global _DSP_dotp_sqr
* ========================================================================= *
* End of file: dsp_dotp_sqr.h62 *
* ------------------------------------------------------------------------- *
* Copyright (c) 2002 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *