94 lines
1.8 KiB
C
94 lines
1.8 KiB
C
#ifndef NORCSID
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static char rcsid[] = "$Header$";
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#endif
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#include "assert.h"
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#include "equiv.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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extern string myalloc();
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int rar[MAXCREG];
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rl_p *lar;
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int maxindex;
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int regclass[NREGS];
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struct perm *perms;
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struct perm *
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tuples(regls,nregneeded) rl_p *regls; {
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int class=0;
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register i,j;
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/*
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* First compute equivalence classes of registers.
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*/
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for (i=0;i<NREGS;i++) {
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regclass[i] = class++;
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if (getrefcount(i, FALSE) == 0) {
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for (j=0;j<i;j++) {
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if (eqregclass(i,j) &&
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eqtoken(&machregs[i].r_contents,
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&machregs[j].r_contents)) {
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regclass[i] = regclass[j];
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break;
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}
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}
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}
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}
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/*
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* Now create tuples through a recursive function
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*/
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maxindex = nregneeded;
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lar = regls;
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perms = 0;
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permute(0);
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return(perms);
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}
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permute(index) {
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register struct perm *pp;
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register rl_p rlp;
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register i,j;
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if (index == maxindex) {
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for (pp=perms; pp != 0; pp=pp->p_next) {
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for (i=0; i<maxindex; i++)
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if (regclass[rar[i]] != regclass[pp->p_rar[i]])
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goto diff;
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for (i=0; i<maxindex; i++)
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for (j=0; j<i; j++)
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if (clash(rar[i],rar[j]) !=
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clash(pp->p_rar[i],pp->p_rar[j]))
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goto diff;
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return;
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diff: ;
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}
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pp = (struct perm *) myalloc(sizeof ( *pp ));
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pp->p_next = perms;
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for (i=0; i<maxindex; i++)
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pp->p_rar[i] = rar[i];
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perms = pp;
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} else {
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rlp=lar[index];
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for (i=rlp->rl_n-1; i>=0; i--) {
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rar[index] = rlp->rl_list[i];
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permute(index+1);
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}
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}
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}
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