?? dspf_sp_autocor.h
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/* ======================================================================== */
/* TEXAS INSTRUMENTS, INC. */
/* */
/* NAME */
/* DSPF_sp_autocor -- Single Precision autocorrelation */
/* */
/* USAGE */
/* This routine has the following C prototype: */
/* */
/* void DSPF_sp_autocor */
/* ( */
/* float * restrict r, */
/* const short * restrict x, */
/* int nx, */
/* int nr */
/* ) */
/* r = pointer to output array of autocorrelation of length nr */
/* x = pointer to input array of length nx+nr. Input data must */
/* be padded with nr consecutive zeros at the beginning. */
/* nx = Length of Autocorrelation vector. */
/* nr = Length of lags. */
/* */
/* */
/* DESCRIPTION */
/* This routine performs the autocorrelation of the input array inp. */
/* It is assumed that the length of the input array, x, is a multiple */
/* of 2 and the length of the output array, r, is a multiple of 4. */
/* The assembly routine computes 4 output samples at a time. */
/* */
/* It is assumed that input vector x is padded with nr no of zeros in */
/* the beginning. */
/* */
/* x is to be aligned on a double word boundary. */
/* */
/* */
/* TECHNIQUES */
/* */
/* The inner loop is unrolled twice and the outer loop is unrolled */
/* four times. */
/* */
/* ASSUMPTIONS */
/* */
/* 1. nx is a multiple of 2 and greater than or equal to 4. */
/* 2. nr is a multiple of 4 and greater than or equal to 4. */
/* 3. nx is greater than or equal to nr */
/* 4. x is double word aligned. */
/* */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
#ifndef DSPF_SP_AUTOCOR_ASM_H_
#define DSPF_SP_AUTOCOR_ASM_H_ 1
void DSPF_sp_autocor(float *restrict r, float *restrict x, int nx, int nr);
#endif
/* ======================================================================== */
/* End of file: DSPF_sp_autocor_h.asm */
/* ------------------------------------------------------------------------ */
/* Copyright (C) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
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