forked from Archive/PX4-Autopilot
450 lines
8.5 KiB
C
450 lines
8.5 KiB
C
/**********************************************************************
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* pjopt.c
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* Branch Optimizations
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* 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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**********************************************************************/
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/**********************************************************************
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* Included Files
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**********************************************************************/
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#include <stdio.h>
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#include "keywords.h"
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#include "pdefs.h"
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#include "pinsn32.h"
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#include "popt.h"
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#include "polocal.h"
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#include "pjopt.h"
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/**********************************************************************/
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int BranchOptimize (void)
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{
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int nchanges = 0;
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register int i;
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TRACE(stderr, "[BranchOptimize]");
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/* At least two pcodes are need to perform branch optimizations */
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i = 0;
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while (i < nops-1)
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{
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switch (pptr[i]->op)
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{
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case oNOT :
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switch (pptr[i+1]->op)
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{
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case oJEQUZ :
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pptr[i+1]->op = oJNEQZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJEQUZ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oNEG :
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switch (pptr[i+1]->op)
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{
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case oJLTZ :
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pptr[i+1]->op = oJGTZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJGTEZ :
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pptr[i+1]->op = oJLTEZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJGTZ :
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pptr[i+1]->op = oJLTZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJLTEZ :
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pptr[i+1]->op = oJGTEZ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oEQU :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oNEQ;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJNEQ;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJEQU;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oNEQ :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oEQU;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJEQU;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJNEQ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oLT :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oGTE;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJGTE;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJLT;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oGTE :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oLT;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJLT;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJGTE;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oGT :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oLTE;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJLTE;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJGT;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oLTE :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oGT;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJGT;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJLTE;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oEQUZ :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oNEQZ;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJNEQZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJEQUZ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oNEQZ :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oEQUZ;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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case oJNEQZ :
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oLTZ :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oGTEZ;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJGTEZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJLTZ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oGTEZ :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oLTZ;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJLTZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJGTEZ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oGTZ :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oLTEZ;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJLTEZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJGTZ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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case oLTEZ :
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switch (pptr[i+1]->op)
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{
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case oNOT :
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pptr[i]->op = oGTZ;
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deletePcode(i+1);
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nchanges++;
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break;
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case oJEQUZ :
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pptr[i+1]->op = oJGTZ;
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deletePcode(i);
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nchanges++;
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break;
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case oJNEQZ :
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pptr[i+1]->op = oJLTEZ;
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deletePcode(i);
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nchanges++;
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break;
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default :
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i++;
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break;
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} /* end switch */
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break;
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default :
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i++;
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break;
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} /* end switch */
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} /* end while */
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return (nchanges);
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} /* end BranchOptimize */
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/**********************************************************************/
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