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119 lines
8.9 KiB
119 lines
8.9 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: 1.18 Tue Oct 14 19:58:57 2003 (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_dotprod *
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* *
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* REVISION DATE *
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* 10-Oct-2003 *
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* *
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* USAGE *
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* This routine is C callable, and has the following C prototype: *
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* *
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* int DSP_dotprod *
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* ( *
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* const short *m, /* Pointer to first vector */ *
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* const short *n, /* Pointer to second vector */ *
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* int count /* Length of vectors. */ *
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* ); *
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* *
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* This routine returns the dot product as its return value. *
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* *
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* DESCRIPTION *
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* The "DSP_dotprod" function implements a dot product of two input *
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* vectors, returning the scalar result. Each element of the *
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* first array is multiplied with the corresponding element of the *
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* second array, and the products are summed. The sum is returned. *
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* *
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* int DSP_dotprod *
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* ( *
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* const short *m, /* Pointer to first vector */ *
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* const short *n, /* Pointer to second vector */ *
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* int count /* Length of vectors. */ *
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* ) *
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* { *
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* int i, sum = 0; *
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* *
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* for (i = 0; i < count; i++) *
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* sum += m[i] * n[i]; *
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* *
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* return sum; *
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* } *
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* *
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* The above C code is a general implementation without *
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* restrictions. The assembly code has some restrictions, as *
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* noted below. *
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* *
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* TECHNIQUES *
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* The code is unrolled 4 times to enable full memory and multiplier *
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* bandwidth to be utilized. *
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* *
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* Interrupts are masked by branch delay slots only. *
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* *
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* Prolog collapsing has been performed to reduce codesize. *
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* *
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* ASSUMPTIONS *
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* The input length is a multiple of 4 and greater than 0. *
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* *
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* The input data and coeeficients are stored on double word *
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* aligned boundaries. *
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* *
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* This code is not interruptible. Interrupts are masked by *
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* branch delay slots during the entire duration of this *
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* function. *
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* *
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* MEMORY NOTE *
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* To avoid bank conflicts, The input arrays 'm' and 'n' must *
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* be offset by 4 half-words (8 bytes). *
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* *
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* The code is ENDIAN NEUTRAL. *
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* *
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* CODESIZE *
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* 160 bytes *
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* *
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* CYCLES *
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* cycles = count/4 + 16 *
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* For count = 720, cycles = 196. *
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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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.global _DSP_dotprod
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* ========================================================================= *
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* End of file: dsp_dotprod.h64 *
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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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