/* ======================================================================== */
/* 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. */
/* ======================================================================== */
#ifndef DSP_MUL32_H_
#define DSP_MUL32_H_ 1
void DSP_mul32
(
const int *x,
const int *y,
int *restrict r,
int nx
);
#endif
/* ======================================================================== */
/* End of file: dsp_mul32.h */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */