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131 lines
4.9 KiB
C
131 lines
4.9 KiB
C
/* $Id: runlength.c,v 1.1 2010/02/07 14:07:25 fredette Exp $ */
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/* libtme/runlength.c - run length: */
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/*
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* Copyright (c) 2010 Matt Fredette
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Matt Fredette.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <tme/common.h>
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_TME_RCSID("$Id: runlength.c,v 1.1 2010/02/07 14:07:25 fredette Exp $");
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/* includes: */
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#include <tme/runlength.h>
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#include <tme/misc.h>
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/* this initializes runlength state: */
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void
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tme_runlength_init(struct tme_runlength *runlength)
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{
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unsigned long runlength_history_count;
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tme_runlength_t runlength_value;
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/* allocate the runlength history: */
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runlength_history_count = runlength->tme_runlength_history_count;
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assert (runlength_history_count > 0);
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runlength->_tme_runlength_history = tme_new(tme_runlength_t, runlength_history_count);
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/* set the initial runlength history sum: */
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runlength_value = runlength->tme_runlength_value;
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runlength->_tme_runlength_history_sum
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= (((double) runlength_value)
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* runlength->tme_runlength_history_count);
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/* initialize the runlength history: */
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do {
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runlength->_tme_runlength_history[runlength_history_count - 1] = runlength_value;
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} while (--runlength_history_count);
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runlength->_tme_runlength_history_next = 0;
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}
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/* this sets the runlength cycles target: */
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void
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tme_runlength_target_cycles(struct tme_runlength *runlength,
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union tme_value64 cycles_elapsed_target_value64)
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{
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double two_to_the_thirtysecond;
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/* make 2^32: */
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two_to_the_thirtysecond = 65536 * (double) 65536;
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/* set the target number of cycles to elapse during a run: */
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runlength->_tme_runlength_cycles_elapsed_target
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= ((cycles_elapsed_target_value64.tme_value64_uint32_hi
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* two_to_the_thirtysecond)
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+ cycles_elapsed_target_value64.tme_value64_uint32_lo);
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}
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/* this updates the runlength: */
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void
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tme_runlength_update(struct tme_runlength *runlength)
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{
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double two_to_the_thirtysecond;
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union tme_value64 cycles_elapsed;
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tme_runlength_t runlength_value;
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unsigned long runlength_history_next;
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double runlength_history_sum;
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/* make 2^32: */
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two_to_the_thirtysecond = 65536 * (double) 65536;
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/* get the number of cycles that elapsed during this run: */
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cycles_elapsed = tme_misc_cycles();
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(void) tme_value64_sub(&cycles_elapsed, &runlength->tme_runlength_cycles_start);
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/* get a better length for this run: */
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runlength_value
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= (runlength->tme_runlength_value
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* (runlength->_tme_runlength_cycles_elapsed_target
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/ ((cycles_elapsed.tme_value64_uint32_hi
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* two_to_the_thirtysecond)
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+ cycles_elapsed.tme_value64_uint32_lo)));
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if (__tme_predict_false(runlength_value == 0)) {
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runlength_value += 1;
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}
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/* update the runlength history and sum: */
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runlength_history_next = runlength->_tme_runlength_history_next;
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runlength_history_sum
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= ((runlength->_tme_runlength_history_sum
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- runlength->_tme_runlength_history[runlength_history_next])
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+ runlength_value);
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runlength->_tme_runlength_history[runlength_history_next] = runlength_value;
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runlength->_tme_runlength_history_sum = runlength_history_sum;
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if (runlength_history_next == 0) {
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runlength_history_next = runlength->tme_runlength_history_count;
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}
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runlength->_tme_runlength_history_next = runlength_history_next - 1;
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/* update the runlength value: */
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runlength->tme_runlength_value
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= (runlength_history_sum
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/ runlength->tme_runlength_history_count);
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}
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