;* ======================================================================== *;
;* TEXAS INSTRUMENTS, INC. *;
;* *;
;* DSPLIB DSP Signal Processing Library *;
;* *;
;* Release: Version 1.02 *;
;* CVS Revision: 1.4 Fri Mar 29 19:40:03 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. *;
;* ======================================================================== *;
* ========================================================================= *
* *
* NAME *
* DSP_mul32 *
* *
* REVISION DATE *
* 29-Mar-2002 *
* *
* USAGE *
* This routine is C-callable and can be called as: *
* *
* void DSP_mul32 *
* ( *
* const int *x, *
* const int *y, *
* int *restrict r, *
* int nx *
* ); *
* *
* x[nx] = pointer to input vector 1 of size nx *
* y[nx] = pointer to input vector 2 of size nx *
* r[nx] = pointer to output vector of size nx *
* nx = number of elements in input and output vectors *
* *
* *
* DESCRIPTION *
* This routine performs a 32-bit by 32-bit multiply, returning the *
* upper 32 bits of the 64-bit result. This is equivalent to a *
* Q31 x Q31 multiply, yielding a Q30 result. *
* *
* NOTES *
* The 32 x 32 multiply is constructed from 16 x 16 multiplies. *
* For efficiency reasons, the 'lo * lo' term of the 32 x 32 *
* multiply is omitted, as it has minimal impact on the final *
* result. This is due to the fact that the 'lo * lo' term *
* primarily affects the lower 32 bits of the result, and these *
* are not returned. Due to this omission, the results of this *
* function differ from the exact results of a 32 x 32 multiply by *
* at most 1. *
* *
* ASSUMPTIONS *
* "nx" is at least 8 and is a multiple of 2. *
* Arrays x[], y[] and r[] must be word aligned. *
* Input and output arrays are independent of each other. *
* *
* NOTES *
* This code is ENDIAN NEUTRAL. *
* This function is interrupt tolerant, but not interruptible. *
* *
* CYCLES *
* cycles = 1.5*nx + 24. *
* *
* CODESIZE *
* 224 bytes *
* ------------------------------------------------------------------------- *
* Copyright (c) 2002 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *
.global _DSP_mul32
* ========================================================================= *
* End of file: dsp_mul32.h62 *
* ------------------------------------------------------------------------- *
* Copyright (c) 2002 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *