;* ======================================================================== *;
;* 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. *
* ========================================================================= *
.global _DSP_dotprod
* ========================================================================= *
* End of file: dsp_dotprod.h62 *
* ------------------------------------------------------------------------- *
* Copyright (c) 2002 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *