140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
#ifndef NORCSID
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static char rcsid[] = "$Id$";
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#endif
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#include "assert.h"
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#include "param.h"
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#include "tables.h"
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#include "types.h"
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#include <cgg_cg.h>
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#include "data.h"
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#include "result.h"
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#include "extern.h"
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Hans van Staveren
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*/
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move(tp1,tp2,ply,toplevel,maxcost) token_p tp1,tp2; unsigned maxcost; {
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register move_p mp;
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unsigned t;
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register struct reginfo *rp;
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register byte *tdpb;
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int i;
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unsigned codegen();
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if (eqtoken(tp1,tp2))
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return(0);
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if (tp2->t_token == -1) {
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if (tp1->t_token == -1) {
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if (eqtoken(&machregs[tp1->t_att[0].ar].r_contents,
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&machregs[tp2->t_att[0].ar].r_contents) &&
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machregs[tp1->t_att[0].ar].r_contents.t_token!=0)
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return(0);
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} else {
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if (eqtoken(&machregs[tp2->t_att[0].ar].r_contents,tp1))
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return(0);
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}
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erasereg(tp2->t_att[0].ar);
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} else if (tp1->t_token == -1) {
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if (eqtoken(tp2,&machregs[tp1->t_att[0].ar].r_contents))
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return(0);
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}
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/*
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* If we arrive here the move must really be executed
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*/
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for (mp=moves;mp->m_set1>=0;mp++) {
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if (!match(tp1,&machsets[mp->m_set1],mp->m_expr1))
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continue;
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if (match(tp2,&machsets[mp->m_set2],mp->m_expr2))
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break;
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/*
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* Correct move rule is found
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*/
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}
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assert(mp->m_set1>=0);
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/*
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* To get correct interpretation of things like %[1]
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* in move code we stack tp2 and tp1. This little trick
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* saves a lot of testing in other places.
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*/
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fakestack[stackheight] = *tp2;
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fakestack[stackheight+1] = *tp1;
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stackheight += 2;
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tokpatlen += 2;
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t = codegen(&coderules[mp->m_cindex],ply,toplevel,maxcost,0);
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tokpatlen -= 2;
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stackheight -= 2;
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if (tp2->t_token == -1) {
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rp = &machregs[tp2->t_att[0].ar];
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if (tp1->t_token == -1) {
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rp->r_contents =
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machregs[tp1->t_att[0].ar].r_contents ;
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}
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else rp->r_contents = *tp1;
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if (rp->r_contents.t_token > 0) {
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tdpb = &(tokens[rp->r_contents.t_token].t_type[0]);
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for (i=0;i<TOKENSIZE;i++)
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if (*tdpb++ == EV_REG &&
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clash(rp->r_contents.t_att[i].ar,tp2->t_att[0].ar)) {
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rp->r_contents.t_token = 0;
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for (i = 0; i < TOKENSIZE; i++)
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rp->r_contents.t_att[i].aw = 0;
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break;
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}
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}
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}
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else if (tp1->t_token == -1)
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machregs[tp1->t_att[0].ar].r_contents = *tp2;
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return(t);
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}
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#define cocoreg machregs[0].r_contents
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setcc(tp) token_p tp; {
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cocoreg = *tp;
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}
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test(tp,ply,toplevel,maxcost) token_p tp; unsigned maxcost; {
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register test_p mp;
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unsigned t;
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unsigned codegen();
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if (cocoreg.t_token!=0) {
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if (eqtoken(tp,&cocoreg))
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return(0);
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if (tp->t_token == -1) {
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if (eqtoken(&machregs[tp->t_att[0].ar].r_contents,&cocoreg))
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return(0);
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}
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}
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/*
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* If we arrive here the test must really be executed
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*/
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for (mp=tests;mp->t_set>=0;mp++) {
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if (match(tp,&machsets[mp->t_set],mp->t_expr))
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break;
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/*
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* Correct move rule is found
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*/
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}
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assert(mp->t_set>=0);
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/*
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* To get correct interpretation of things like %[1]
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* in test code we stack tp. This little trick
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* saves a lot of testing in other places.
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*/
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fakestack[stackheight] = *tp;
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stackheight++;
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tokpatlen++;
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t = codegen(&coderules[mp->t_cindex],ply,toplevel,maxcost,0);
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tokpatlen--;
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stackheight--;
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return(t);
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}
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