da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/***********************************************************************
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* This software is part of the ast package *
3e14f97f673e8a630f076077de35afdd43dc1587Roger A. Faulkner* Copyright (c) 1985-2010 AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* and is licensed under the *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Common Public License, Version 1.0 *
7c2fbfb345896881c631598ee3852ce9ce33fb07April Chin* by AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* A copy of the License is available at *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* http://www.opensource.org/licenses/cpl1.0.txt *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Information and Software Systems Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* AT&T Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Florham Park NJ *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Glenn Fowler <gsf@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* David Korn <dgk@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Phong Vo <kpv@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin***********************************************************************/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#pragma prototyped
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Glenn Fowler
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * AT&T Research
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * internal representation conversion support
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <ast.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <swap.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * swap n bytes according to op
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * from==to is ok
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinvoid*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinswapmem(int op, const void* from, void* to, register size_t n)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register char* f = (char*)from;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register char* t = (char*)to;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register int c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin switch (op & (n - 1))
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 0:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (t != f)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin memcpy(t, f, n);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 1:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (n >>= 1; n--; f += 2, t += 2)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[0]; t[0] = f[1]; t[1] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 2:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (n >>= 2; n--; f += 4, t += 4)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[0]; t[0] = f[2]; t[2] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[1]; t[1] = f[3]; t[3] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 3:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (n >>= 2; n--; f += 4, t += 4)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[0]; t[0] = f[3]; t[3] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[1]; t[1] = f[2]; t[2] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 4:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (n >>= 3; n--; f += 8, t += 8)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[0]; t[0] = f[4]; t[4] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[1]; t[1] = f[5]; t[5] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[2]; t[2] = f[6]; t[6] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[3]; t[3] = f[7]; t[7] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 5:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (n >>= 3; n--; f += 8, t += 8)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[0]; t[0] = f[5]; t[5] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[1]; t[1] = f[4]; t[4] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[2]; t[2] = f[7]; t[7] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[3]; t[3] = f[6]; t[6] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 6:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (n >>= 3; n--; f += 8, t += 8)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[0]; t[0] = f[6]; t[6] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[1]; t[1] = f[7]; t[7] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[2]; t[2] = f[4]; t[4] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[3]; t[3] = f[5]; t[5] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case 7:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (n >>= 3; n--; f += 8, t += 8)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[0]; t[0] = f[7]; t[7] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[1]; t[1] = f[6]; t[6] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[2]; t[2] = f[5]; t[5] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin c = f[3]; t[3] = f[4]; t[4] = c;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return to;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}