ack/mach/proto/cg/reg.c

#ifndef NORCSID
static char rcsid[] = "$Header$";
#endif

#include "assert.h"
#include "param.h"
#include "tables.h"
#include "types.h"
#include <cg_pattern.h>
#include "data.h"
#include "result.h"
#include "extern.h"

/*
 * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
 *
 *          This product is part of the Amsterdam Compiler Kit.
 *
 * Permission to use, sell, duplicate or disclose this software must be
 * obtained in writing. Requests for such permissions may be sent to
 *
 *      Dr. Andrew S. Tanenbaum
 *      Wiskundig Seminarium
 *      Vrije Universiteit
 *      Postbox 7161
 *      1007 MC Amsterdam
 *      The Netherlands
 *
 * Author: Hans van Staveren
 */

chrefcount(regno,amount,tflag) {
	register struct reginfo *rp;
	register i;

	rp= &machregs[regno];
#if MAXMEMBERS!=0
	if (rp->r_members[0]==0) {
#endif
		rp->r_refcount += amount;
		if (tflag)
			rp->r_tcount += amount;
		assert(rp->r_refcount >= 0);
#if MAXMEMBERS!=0
	} else
		for (i=0;i<MAXMEMBERS;i++)
			if (rp->r_members[i]!=0)
				chrefcount(rp->r_members[i],amount,tflag);
#endif
}

getrefcount(regno) {
	register struct reginfo *rp;
	register i,maxcount;

	rp= &machregs[regno];
#if MAXMEMBERS!=0
	if (rp->r_members[0]==0)
#endif
		return(rp->r_refcount);
#if MAXMEMBERS!=0
	else {
		maxcount=0;
		for (i=0;i<MAXMEMBERS;i++)
			if (rp->r_members[i]!=0)
				maxcount=max(maxcount,getrefcount(rp->r_members[i]));
		return(maxcount);
	}
#endif
}

erasereg(regno) {
	register struct reginfo *rp;

#if MAXMEMBERS==0
	awayreg(regno);
#else
	for (rp=machregs;rp<machregs+NREGS;rp++)
		if (rp->r_clash[regno>>4]&(1<<(regno&017)))
			awayreg(rp-machregs);
#endif
}

awayreg(regno) {
	register struct reginfo *rp;
	register tkdef_p tdp;
	register i;

	rp = &machregs[regno];
	rp->r_contents.t_token = 0;
	for (i=0;i<TOKENSIZE;i++)
		rp->r_contents.t_att[i].aw = 0;

	/* Now erase recursively all registers containing
	 * something using this one
	 */
	for (rp=machregs;rp<machregs+NREGS;rp++) {
		if (rp->r_contents.t_token == -1) {
			if (rp->r_contents.t_att[0].ar == regno)
				erasereg(rp-machregs);
		} else {
			tdp= & tokens[rp->r_contents.t_token];
			for (i=0;i<TOKENSIZE;i++)
				if (tdp->t_type[i] == EV_REG && 
				    rp->r_contents.t_att[i].ar == regno) {
					erasereg(rp-machregs);
					break;
				}
		}
	}
}

cleanregs() {
	register struct reginfo *rp;
	register i;

	for (rp=machregs;rp<machregs+NREGS;rp++) {
		rp->r_contents.t_token = 0;
		for (i=0;i<TOKENSIZE;i++)
			rp->r_contents.t_att[i].aw = 0;
	}
}

#ifndef NDEBUG
inctcount(regno) {
	register struct reginfo *rp;
	register i;

	rp = &machregs[regno];
#if MAXMEMBERS!=0
	if (rp->r_members[0] == 0) {
#endif
		rp->r_tcount++;
#if MAXMEMBERS!=0
	} else  {
		for (i=0;i<MAXMEMBERS;i++)
			if (rp->r_members[i] != 0)
				inctcount(rp->r_members[i]);
	}
#endif
}

chkregs() {
	register struct reginfo *rp;
	register token_p tp;
	register tkdef_p tdp;
	int i;

	for (rp=machregs;rp<machregs+NREGS;rp++) {
		assert(rp->r_tcount==0);
	}
	for (tp=fakestack;tp<fakestack+stackheight;tp++) {
		if (tp->t_token == -1)
			inctcount(tp->t_att[0].ar);
		else {
			tdp = &tokens[tp->t_token];
			for (i=0;i<TOKENSIZE;i++)
				if (tdp->t_type[i]==EV_REG)
					inctcount(tp->t_att[i].ar);
		}
	}
#ifdef REGVARS
#include <em_reg.h>
	for(i=reg_any;i<=reg_float;i++) {
		int j;
		for(j=0;j<nregvar[i];j++)
			inctcount(rvnumbers[i][j]);
	}
#endif REGVARS
	for (rp=machregs;rp<machregs+NREGS;rp++) {
		assert(rp->r_refcount==rp->r_tcount);
		rp->r_tcount=0;
	}
}
#endif