mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
633a5b1aac
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3785 91177308-0d34-0410-b5e6-96231b3b80d8
413 lines
8.2 KiB
C
413 lines
8.2 KiB
C
char rcsid_trim[] = "$Id$";
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#include <stdio.h>
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#include "b.h"
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#include "fe.h"
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Relation *allpairs;
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int trimflag = 0;
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int debugTrim = 0;
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static void siblings ARGS((int, int));
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static void findAllNexts ARGS((void));
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static Relation *newAllPairs ARGS((void));
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static void
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siblings(i, j) int i; int j;
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{
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int k;
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List pl;
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DeltaCost Max;
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int foundmax;
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allpairs[i][j].sibComputed = 1;
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if (i == 1) {
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return; /* never trim start symbol */
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}
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if (i==j) {
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return;
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}
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ZEROCOST(Max);
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foundmax = 0;
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for (k = 1; k < max_nonterminal; k++) {
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DeltaCost tmp;
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if (k==i || k==j) {
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continue;
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}
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if (!allpairs[k][i].rule) {
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continue;
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}
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if (!allpairs[k][j].rule) {
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return;
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}
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ASSIGNCOST(tmp, allpairs[k][j].chain);
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MINUSCOST(tmp, allpairs[k][i].chain);
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if (foundmax) {
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if (LESSCOST(Max, tmp)) {
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ASSIGNCOST(Max, tmp);
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}
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} else {
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foundmax = 1;
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ASSIGNCOST(Max, tmp);
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}
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}
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for (pl = rules; pl; pl = pl->next) {
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Rule p = (Rule) pl->x;
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Operator op = p->pat->op;
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List oprule;
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DeltaCost Min;
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int foundmin;
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if (!op) {
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continue;
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}
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switch (op->arity) {
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case 0:
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continue;
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case 1:
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if (!allpairs[p->pat->children[0]->num ][ i].rule) {
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continue;
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}
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foundmin = 0;
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for (oprule = op->table->rules; oprule; oprule = oprule->next) {
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Rule s = (Rule) oprule->x;
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DeltaPtr Cx;
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DeltaPtr Csj;
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DeltaPtr Cpi;
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DeltaCost tmp;
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if (!allpairs[p->lhs->num ][ s->lhs->num].rule
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|| !allpairs[s->pat->children[0]->num ][ j].rule) {
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continue;
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}
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Cx = allpairs[p->lhs->num ][ s->lhs->num].chain;
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Csj= allpairs[s->pat->children[0]->num ][ j].chain;
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Cpi= allpairs[p->pat->children[0]->num ][ i].chain;
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ASSIGNCOST(tmp, Cx);
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ADDCOST(tmp, s->delta);
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ADDCOST(tmp, Csj);
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MINUSCOST(tmp, Cpi);
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MINUSCOST(tmp, p->delta);
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if (foundmin) {
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if (LESSCOST(tmp, Min)) {
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ASSIGNCOST(Min, tmp);
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}
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} else {
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foundmin = 1;
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ASSIGNCOST(Min, tmp);
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}
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}
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if (!foundmin) {
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return;
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}
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if (foundmax) {
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if (LESSCOST(Max, Min)) {
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ASSIGNCOST(Max, Min);
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}
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} else {
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foundmax = 1;
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ASSIGNCOST(Max, Min);
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}
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break;
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case 2:
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/* do first dimension */
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if (allpairs[p->pat->children[0]->num ][ i].rule) {
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foundmin = 0;
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for (oprule = op->table->rules; oprule; oprule = oprule->next) {
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Rule s = (Rule) oprule->x;
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DeltaPtr Cx;
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DeltaPtr Cb;
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DeltaPtr Csj;
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DeltaPtr Cpi;
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DeltaCost tmp;
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if (allpairs[p->lhs->num ][ s->lhs->num].rule
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&& allpairs[s->pat->children[0]->num ][ j].rule
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&& allpairs[s->pat->children[1]->num ][ p->pat->children[1]->num].rule) {
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Cx = allpairs[p->lhs->num ][ s->lhs->num].chain;
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Csj= allpairs[s->pat->children[0]->num ][ j].chain;
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Cpi= allpairs[p->pat->children[0]->num ][ i].chain;
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Cb = allpairs[s->pat->children[1]->num ][ p->pat->children[1]->num].chain;
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ASSIGNCOST(tmp, Cx);
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ADDCOST(tmp, s->delta);
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ADDCOST(tmp, Csj);
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ADDCOST(tmp, Cb);
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MINUSCOST(tmp, Cpi);
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MINUSCOST(tmp, p->delta);
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if (foundmin) {
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if (LESSCOST(tmp, Min)) {
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ASSIGNCOST(Min, tmp);
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}
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} else {
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foundmin = 1;
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ASSIGNCOST(Min, tmp);
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}
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}
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}
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if (!foundmin) {
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return;
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}
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if (foundmax) {
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if (LESSCOST(Max, Min)) {
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ASSIGNCOST(Max, Min);
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}
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} else {
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foundmax = 1;
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ASSIGNCOST(Max, Min);
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}
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}
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/* do second dimension */
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if (allpairs[p->pat->children[1]->num ][ i].rule) {
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foundmin = 0;
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for (oprule = op->table->rules; oprule; oprule = oprule->next) {
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Rule s = (Rule) oprule->x;
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DeltaPtr Cx;
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DeltaPtr Cb;
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DeltaPtr Csj;
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DeltaPtr Cpi;
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DeltaCost tmp;
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if (allpairs[p->lhs->num ][ s->lhs->num].rule
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&& allpairs[s->pat->children[1]->num ][ j].rule
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&& allpairs[s->pat->children[0]->num ][ p->pat->children[0]->num].rule) {
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Cx = allpairs[p->lhs->num ][ s->lhs->num].chain;
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Csj= allpairs[s->pat->children[1]->num ][ j].chain;
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Cpi= allpairs[p->pat->children[1]->num ][ i].chain;
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Cb = allpairs[s->pat->children[0]->num ][ p->pat->children[0]->num].chain;
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ASSIGNCOST(tmp, Cx);
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ADDCOST(tmp, s->delta);
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ADDCOST(tmp, Csj);
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ADDCOST(tmp, Cb);
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MINUSCOST(tmp, Cpi);
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MINUSCOST(tmp, p->delta);
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if (foundmin) {
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if (LESSCOST(tmp, Min)) {
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ASSIGNCOST(Min, tmp);
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}
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} else {
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foundmin = 1;
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ASSIGNCOST(Min, tmp);
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}
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}
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}
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if (!foundmin) {
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return;
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}
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if (foundmax) {
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if (LESSCOST(Max, Min)) {
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ASSIGNCOST(Max, Min);
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}
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} else {
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foundmax = 1;
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ASSIGNCOST(Max, Min);
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}
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}
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break;
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default:
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assert(0);
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}
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}
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allpairs[i ][ j].sibFlag = foundmax;
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ASSIGNCOST(allpairs[i ][ j].sibling, Max);
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}
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static void
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findAllNexts()
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{
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int i,j;
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int last;
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for (i = 1; i < max_nonterminal; i++) {
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last = 0;
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for (j = 1; j < max_nonterminal; j++) {
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if (allpairs[i ][j].rule) {
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allpairs[i ][ last].nextchain = j;
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last = j;
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}
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}
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}
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/*
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for (i = 1; i < max_nonterminal; i++) {
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last = 0;
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for (j = 1; j < max_nonterminal; j++) {
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if (allpairs[i ][j].sibFlag) {
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allpairs[i ][ last].nextsibling = j;
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last = j;
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}
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}
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}
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*/
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}
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static Relation *
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newAllPairs()
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{
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int i;
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Relation *rv;
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rv = (Relation*) zalloc(max_nonterminal * sizeof(Relation));
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for (i = 0; i < max_nonterminal; i++) {
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rv[i] = (Relation) zalloc(max_nonterminal * sizeof(struct relation));
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}
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return rv;
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}
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void
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findAllPairs()
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{
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List pl;
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int changes;
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int j;
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allpairs = newAllPairs();
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for (pl = chainrules; pl; pl = pl->next) {
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Rule p = (Rule) pl->x;
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NonTerminalNum rhs = p->pat->children[0]->num;
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NonTerminalNum lhs = p->lhs->num;
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Relation r = &allpairs[lhs ][ rhs];
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if (LESSCOST(p->delta, r->chain)) {
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ASSIGNCOST(r->chain, p->delta);
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r->rule = p;
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}
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}
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for (j = 1; j < max_nonterminal; j++) {
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Relation r = &allpairs[j ][ j];
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ZEROCOST(r->chain);
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r->rule = &stub_rule;
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}
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changes = 1;
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while (changes) {
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changes = 0;
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for (pl = chainrules; pl; pl = pl->next) {
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Rule p = (Rule) pl->x;
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NonTerminalNum rhs = p->pat->children[0]->num;
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NonTerminalNum lhs = p->lhs->num;
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int i;
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for (i = 1; i < max_nonterminal; i++) {
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Relation r = &allpairs[rhs ][ i];
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Relation s = &allpairs[lhs ][ i];
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DeltaCost dc;
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if (!r->rule) {
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continue;
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}
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ASSIGNCOST(dc, p->delta);
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ADDCOST(dc, r->chain);
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if (!s->rule || LESSCOST(dc, s->chain)) {
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s->rule = p;
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ASSIGNCOST(s->chain, dc);
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changes = 1;
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}
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}
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}
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}
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findAllNexts();
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}
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void
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trim(t) Item_Set t;
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{
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int m,n;
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static short *vec = 0;
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int last;
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assert(!t->closed);
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debug(debugTrim, printf("Begin Trim\n"));
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debug(debugTrim, dumpItem_Set(t));
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last = 0;
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if (!vec) {
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vec = (short*) zalloc(max_nonterminal * sizeof(*vec));
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}
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for (m = 1; m < max_nonterminal; m++) {
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if (t->virgin[m].rule) {
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vec[last++] = m;
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}
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}
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for (m = 0; m < last; m++) {
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DeltaCost tmp;
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int j;
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int i;
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i = vec[m];
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for (j = allpairs[i ][ 0].nextchain; j; j = allpairs[i ][ j].nextchain) {
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if (i == j) {
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continue;
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}
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if (!t->virgin[j].rule) {
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continue;
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}
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ASSIGNCOST(tmp, t->virgin[j].delta);
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ADDCOST(tmp, allpairs[i ][ j].chain);
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if (!LESSCOST(t->virgin[i].delta, tmp)) {
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t->virgin[i].rule = 0;
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ZEROCOST(t->virgin[i].delta);
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debug(debugTrim, printf("Trimmed Chain (%d,%d)\n", i,j));
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goto outer;
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}
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}
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if (!trimflag) {
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continue;
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}
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for (n = 0; n < last; n++) {
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j = vec[n];
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if (i == j) {
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continue;
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}
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if (!t->virgin[j].rule) {
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continue;
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}
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if (!allpairs[i][j].sibComputed) {
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siblings(i,j);
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}
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if (!allpairs[i][j].sibFlag) {
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continue;
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}
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ASSIGNCOST(tmp, t->virgin[j].delta);
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ADDCOST(tmp, allpairs[i ][ j].sibling);
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if (!LESSCOST(t->virgin[i].delta, tmp)) {
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t->virgin[i].rule = 0;
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ZEROCOST(t->virgin[i].delta);
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goto outer;
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}
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}
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outer: ;
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}
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debug(debugTrim, dumpItem_Set(t));
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debug(debugTrim, printf("End Trim\n"));
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}
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void
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dumpRelation(r) Relation r;
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{
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printf("{ %d %ld %d %ld }", r->rule->erulenum, (long) r->chain, r->sibFlag, (long) r->sibling);
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}
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void
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dumpAllPairs()
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{
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int i,j;
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printf("Dumping AllPairs\n");
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for (i = 1; i < max_nonterminal; i++) {
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for (j = 1; j < max_nonterminal; j++) {
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dumpRelation(&allpairs[i ][j]);
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}
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printf("\n");
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}
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}
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