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- #include "gc.h"
- void
- cgen(Node *n, Node *nn)
- {
- Node *l, *r;
- Prog *p1;
- Node nod, nod1, nod2, nod3, nod4;
- int o;
- long v, curs;
- if(debug['g']) {
- prtree(nn, "cgen lhs");
- prtree(n, "cgen");
- }
- if(n == Z || n->type == T)
- return;
- if(typesuv[n->type->etype]) {
- sugen(n, nn, n->type->width);
- return;
- }
- l = n->left;
- r = n->right;
- o = n->op;
- if(n->addable >= INDEXED) {
- if(nn == Z) {
- switch(o) {
- default:
- nullwarn(Z, Z);
- break;
- case OINDEX:
- nullwarn(l, r);
- break;
- }
- return;
- }
- gmove(n, nn);
- return;
- }
- curs = cursafe;
- if(n->complex >= FNX)
- if(l->complex >= FNX)
- if(r != Z && r->complex >= FNX)
- switch(o) {
- default:
- regret(&nod, r);
- cgen(r, &nod);
- regsalloc(&nod1, r);
- gopcode(OAS, &nod, Z, &nod1);
- regfree(&nod);
- nod = *n;
- nod.right = &nod1;
- cgen(&nod, nn);
- return;
- case OFUNC:
- case OCOMMA:
- case OANDAND:
- case OOROR:
- case OCOND:
- case ODOT:
- break;
- }
- switch(o) {
- default:
- diag(n, "unknown op in cgen: %O", o);
- break;
- case OAS:
- if(l->op == OBIT)
- goto bitas;
- if(l->addable >= INDEXED) {
- if(nn != Z || r->addable < INDEXED) {
- if(r->complex >= FNX && nn == Z)
- regret(&nod, r);
- else
- regalloc(&nod, r, nn);
- cgen(r, &nod);
- gmove(&nod, l);
- if(nn != Z)
- gmove(&nod, nn);
- regfree(&nod);
- } else
- gmove(r, l);
- break;
- }
- if(l->complex >= r->complex) {
- reglcgen(&nod1, l, Z);
- if(r->addable >= INDEXED) {
- gmove(r, &nod1);
- if(nn != Z)
- gmove(r, nn);
- regfree(&nod1);
- break;
- }
- regalloc(&nod, r, nn);
- cgen(r, &nod);
- } else {
- regalloc(&nod, r, nn);
- cgen(r, &nod);
- reglcgen(&nod1, l, Z);
- }
- gmove(&nod, &nod1);
- regfree(&nod);
- regfree(&nod1);
- break;
- bitas:
- n = l->left;
- regalloc(&nod, r, nn);
- if(l->complex >= r->complex) {
- reglcgen(&nod1, n, Z);
- cgen(r, &nod);
- } else {
- cgen(r, &nod);
- reglcgen(&nod1, n, Z);
- }
- regalloc(&nod2, n, Z);
- gopcode(OAS, &nod1, Z, &nod2);
- bitstore(l, &nod, &nod1, &nod2, nn);
- break;
- case OBIT:
- if(nn == Z) {
- nullwarn(l, Z);
- break;
- }
- bitload(n, &nod, Z, Z, nn);
- gopcode(OAS, &nod, Z, nn);
- regfree(&nod);
- break;
- case OADD:
- case OSUB:
- case OAND:
- case OOR:
- case OXOR:
- case OLSHR:
- case OASHL:
- case OASHR:
- /*
- * immediate operands
- */
- if(nn != Z)
- if(r->op == OCONST)
- if(!typefd[n->type->etype]) {
- cgen(l, nn);
- if(r->vconst == 0)
- if(o != OAND)
- break;
- if(nn != Z)
- gopcode(o, r, Z, nn);
- break;
- }
- case OMUL:
- case OLMUL:
- case OLDIV:
- case OLMOD:
- case ODIV:
- case OMOD:
- if(nn == Z) {
- nullwarn(l, r);
- break;
- }
- if(o == OMUL || o == OLMUL) {
- if(mulcon(n, nn))
- break;
- if(debug['M'])
- print("%L multiply\n", n->lineno);
- }
- if(l->complex >= r->complex) {
- regalloc(&nod, l, nn);
- cgen(l, &nod);
- regalloc(&nod1, r, Z);
- cgen(r, &nod1);
- gopcode(o, &nod1, Z, &nod);
- } else {
- regalloc(&nod, r, nn);
- cgen(r, &nod);
- regalloc(&nod1, l, Z);
- cgen(l, &nod1);
- gopcode(o, &nod, &nod1, &nod);
- }
- gopcode(OAS, &nod, Z, nn);
- regfree(&nod);
- regfree(&nod1);
- break;
- case OASLSHR:
- case OASASHL:
- case OASASHR:
- case OASAND:
- case OASADD:
- case OASSUB:
- case OASXOR:
- case OASOR:
- if(l->op == OBIT)
- goto asbitop;
- if(r->op == OCONST)
- if(!typefd[n->type->etype]) {
- if(l->addable < INDEXED)
- reglcgen(&nod2, l, Z);
- else
- nod2 = *l;
- regalloc(&nod, r, nn);
- gopcode(OAS, &nod2, Z, &nod);
- gopcode(o, r, Z, &nod);
- gopcode(OAS, &nod, Z, &nod2);
-
- regfree(&nod);
- if(l->addable < INDEXED)
- regfree(&nod2);
- break;
- }
- case OASLMUL:
- case OASLDIV:
- case OASLMOD:
- case OASMUL:
- case OASDIV:
- case OASMOD:
- if(l->op == OBIT)
- goto asbitop;
- if(l->complex >= r->complex) {
- if(l->addable < INDEXED)
- reglcgen(&nod2, l, Z);
- else
- nod2 = *l;
- regalloc(&nod, n, nn);
- cgen(r, &nod);
- } else {
- regalloc(&nod, n, nn);
- cgen(r, &nod);
- if(l->addable < INDEXED)
- reglcgen(&nod2, l, Z);
- else
- nod2 = *l;
- }
- regalloc(&nod1, n, Z);
- gopcode(OAS, &nod2, Z, &nod1);
- gopcode(o, &nod, &nod1, &nod);
- gopcode(OAS, &nod, Z, &nod2);
- regfree(&nod);
- regfree(&nod1);
- if(l->addable < INDEXED)
- regfree(&nod2);
- break;
- asbitop:
- regalloc(&nod4, n, nn);
- regalloc(&nod3, r, Z);
- if(l->complex >= r->complex) {
- bitload(l, &nod, &nod1, &nod2, &nod4);
- cgen(r, &nod3);
- } else {
- cgen(r, &nod3);
- bitload(l, &nod, &nod1, &nod2, &nod4);
- }
- gmove(&nod, &nod4);
- gopcode(n->op, &nod3, Z, &nod4);
- regfree(&nod3);
- gmove(&nod4, &nod);
- regfree(&nod4);
- bitstore(l, &nod, &nod1, &nod2, nn);
- break;
- case OADDR:
- if(nn == Z) {
- nullwarn(l, Z);
- break;
- }
- lcgen(l, nn);
- break;
- case OFUNC:
- if(l->complex >= FNX) {
- if(l->op != OIND)
- diag(n, "bad function call");
- regret(&nod, l->left);
- cgen(l->left, &nod);
- regsalloc(&nod1, l->left);
- gopcode(OAS, &nod, Z, &nod1);
- regfree(&nod);
- nod = *n;
- nod.left = &nod2;
- nod2 = *l;
- nod2.left = &nod1;
- nod2.complex = 1;
- cgen(&nod, nn);
- return;
- }
- o = reg[REGARG];
- gargs(r, &nod, &nod1);
- if(l->addable < INDEXED) {
- reglcgen(&nod, l, Z);
- gopcode(OFUNC, Z, Z, &nod);
- regfree(&nod);
- } else
- gopcode(OFUNC, Z, Z, l);
- if(REGARG)
- if(o != reg[REGARG])
- reg[REGARG]--;
- if(nn != Z) {
- regret(&nod, n);
- gopcode(OAS, &nod, Z, nn);
- regfree(&nod);
- }
- break;
- case OIND:
- if(nn == Z) {
- cgen(l, nn);
- break;
- }
- regialloc(&nod, n, nn);
- r = l;
- while(r->op == OADD)
- r = r->right;
- if(sconst(r)) {
- v = r->vconst;
- r->vconst = 0;
- cgen(l, &nod);
- nod.xoffset += v;
- r->vconst = v;
- } else
- cgen(l, &nod);
- regind(&nod, n);
- gopcode(OAS, &nod, Z, nn);
- regfree(&nod);
- break;
- case OEQ:
- case ONE:
- case OLE:
- case OLT:
- case OGE:
- case OGT:
- case OLO:
- case OLS:
- case OHI:
- case OHS:
- if(nn == Z) {
- nullwarn(l, r);
- break;
- }
- boolgen(n, 1, nn);
- break;
- case OANDAND:
- case OOROR:
- boolgen(n, 1, nn);
- if(nn == Z)
- patch(p, pc);
- break;
- case ONOT:
- if(nn == Z) {
- nullwarn(l, Z);
- break;
- }
- boolgen(n, 1, nn);
- break;
- case OCOMMA:
- cgen(l, Z);
- cgen(r, nn);
- break;
- case OCAST:
- if(nn == Z) {
- nullwarn(l, Z);
- break;
- }
- /*
- * convert from types l->n->nn
- */
- if(nocast(l->type, n->type) && nocast(n->type, nn->type)) {
- /* both null, gen l->nn */
- cgen(l, nn);
- break;
- }
- regalloc(&nod, l, nn);
- cgen(l, &nod);
- regalloc(&nod1, n, &nod);
- gopcode(OAS, &nod, Z, &nod1);
- gopcode(OAS, &nod1, Z, nn);
- regfree(&nod1);
- regfree(&nod);
- break;
- case ODOT:
- sugen(l, nodrat, l->type->width);
- if(nn != Z) {
- warn(n, "non-interruptable temporary");
- nod = *nodrat;
- if(!r || r->op != OCONST) {
- diag(n, "DOT and no offset");
- break;
- }
- nod.xoffset += (long)r->vconst;
- nod.type = n->type;
- cgen(&nod, nn);
- }
- break;
- case OCOND:
- bcgen(l, 1);
- p1 = p;
- cgen(r->left, nn);
- gbranch(OGOTO);
- patch(p1, pc);
- p1 = p;
- cgen(r->right, nn);
- patch(p1, pc);
- break;
- case OPOSTINC:
- case OPOSTDEC:
- v = 1;
- if(l->type->etype == TIND)
- v = l->type->link->width;
- if(o == OPOSTDEC)
- v = -v;
- if(l->op == OBIT)
- goto bitinc;
- if(nn == Z)
- goto pre;
- if(l->addable < INDEXED)
- reglcgen(&nod2, l, Z);
- else
- nod2 = *l;
- regalloc(&nod, l, nn);
- gopcode(OAS, &nod2, Z, &nod);
- regalloc(&nod1, l, Z);
- if(typefd[l->type->etype]) {
- regalloc(&nod3, l, Z);
- if(v < 0) {
- gopcode(OAS, nodfconst(-v), Z, &nod3);
- gopcode(OSUB, &nod3, &nod, &nod1);
- } else {
- gopcode(OAS, nodfconst(v), Z, &nod3);
- gopcode(OADD, &nod3, &nod, &nod1);
- }
- regfree(&nod3);
- } else
- gopcode(OADD, nodconst(v), &nod, &nod1);
- gopcode(OAS, &nod1, Z, &nod2);
- regfree(&nod);
- regfree(&nod1);
- if(l->addable < INDEXED)
- regfree(&nod2);
- break;
- case OPREINC:
- case OPREDEC:
- v = 1;
- if(l->type->etype == TIND)
- v = l->type->link->width;
- if(o == OPREDEC)
- v = -v;
- if(l->op == OBIT)
- goto bitinc;
- pre:
- if(l->addable < INDEXED)
- reglcgen(&nod2, l, Z);
- else
- nod2 = *l;
- regalloc(&nod, l, nn);
- gopcode(OAS, &nod2, Z, &nod);
- if(typefd[l->type->etype]) {
- regalloc(&nod3, l, Z);
- if(v < 0) {
- gopcode(OAS, nodfconst(-v), Z, &nod3);
- gopcode(OSUB, &nod3, Z, &nod);
- } else {
- gopcode(OAS, nodfconst(v), Z, &nod3);
- gopcode(OADD, &nod3, Z, &nod);
- }
- regfree(&nod3);
- } else
- gopcode(OADD, nodconst(v), Z, &nod);
- gopcode(OAS, &nod, Z, &nod2);
- if(nn && l->op == ONAME) /* in x=++i, emit USED(i) */
- gins(ANOP, l, Z);
- regfree(&nod);
- if(l->addable < INDEXED)
- regfree(&nod2);
- break;
- bitinc:
- if(nn != Z && (o == OPOSTINC || o == OPOSTDEC)) {
- bitload(l, &nod, &nod1, &nod2, Z);
- gopcode(OAS, &nod, Z, nn);
- gopcode(OADD, nodconst(v), Z, &nod);
- bitstore(l, &nod, &nod1, &nod2, Z);
- break;
- }
- bitload(l, &nod, &nod1, &nod2, nn);
- gopcode(OADD, nodconst(v), Z, &nod);
- bitstore(l, &nod, &nod1, &nod2, nn);
- break;
- }
- cursafe = curs;
- }
- void
- reglcgen(Node *t, Node *n, Node *nn)
- {
- Node *r;
- long v;
- regialloc(t, n, nn);
- if(n->op == OIND) {
- r = n->left;
- while(r->op == OADD)
- r = r->right;
- if(sconst(r)) {
- v = r->vconst;
- r->vconst = 0;
- lcgen(n, t);
- t->xoffset += v;
- r->vconst = v;
- regind(t, n);
- return;
- }
- }
- lcgen(n, t);
- regind(t, n);
- }
- void
- lcgen(Node *n, Node *nn)
- {
- Prog *p1;
- Node nod;
- if(debug['g']) {
- prtree(nn, "lcgen lhs");
- prtree(n, "lcgen");
- }
- if(n == Z || n->type == T)
- return;
- if(nn == Z) {
- nn = &nod;
- regalloc(&nod, n, Z);
- }
- switch(n->op) {
- default:
- if(n->addable < INDEXED) {
- diag(n, "unknown op in lcgen: %O", n->op);
- break;
- }
- nod = *n;
- nod.op = OADDR;
- nod.left = n;
- nod.right = Z;
- nod.type = types[TIND];
- gopcode(OAS, &nod, Z, nn);
- break;
- case OCOMMA:
- cgen(n->left, n->left);
- lcgen(n->right, nn);
- break;
- case OIND:
- cgen(n->left, nn);
- break;
- case OCOND:
- bcgen(n->left, 1);
- p1 = p;
- lcgen(n->right->left, nn);
- gbranch(OGOTO);
- patch(p1, pc);
- p1 = p;
- lcgen(n->right->right, nn);
- patch(p1, pc);
- break;
- }
- }
- void
- bcgen(Node *n, int true)
- {
- if(n->type == T)
- gbranch(OGOTO);
- else
- boolgen(n, true, Z);
- }
- void
- boolgen(Node *n, int true, Node *nn)
- {
- int o;
- Prog *p1, *p2;
- Node *l, *r, nod, nod1;
- long curs;
- if(debug['g']) {
- prtree(nn, "boolgen lhs");
- prtree(n, "boolgen");
- }
- curs = cursafe;
- l = n->left;
- r = n->right;
- switch(n->op) {
- default:
- if(n->op == OCONST) {
- o = vconst(n);
- if(!true)
- o = !o;
- gbranch(OGOTO);
- if(o) {
- p1 = p;
- gbranch(OGOTO);
- patch(p1, pc);
- }
- goto com;
- }
- regalloc(&nod, n, nn);
- cgen(n, &nod);
- o = ONE;
- if(true)
- o = comrel[relindex(o)];
- if(typefd[n->type->etype]) {
- nodreg(&nod1, n, NREG+FREGZERO);
- gopcode(o, &nod, Z, &nod1);
- } else
- gopcode(o, &nod, Z, nodconst(0));
- regfree(&nod);
- goto com;
- case OCOMMA:
- cgen(l, Z);
- boolgen(r, true, nn);
- break;
- case ONOT:
- boolgen(l, !true, nn);
- break;
- case OCOND:
- bcgen(l, 1);
- p1 = p;
- bcgen(r->left, true);
- p2 = p;
- gbranch(OGOTO);
- patch(p1, pc);
- p1 = p;
- bcgen(r->right, !true);
- patch(p2, pc);
- p2 = p;
- gbranch(OGOTO);
- patch(p1, pc);
- patch(p2, pc);
- goto com;
- case OANDAND:
- if(!true)
- goto caseor;
- caseand:
- bcgen(l, true);
- p1 = p;
- bcgen(r, !true);
- p2 = p;
- patch(p1, pc);
- gbranch(OGOTO);
- patch(p2, pc);
- goto com;
- case OOROR:
- if(!true)
- goto caseand;
- caseor:
- bcgen(l, !true);
- p1 = p;
- bcgen(r, !true);
- p2 = p;
- gbranch(OGOTO);
- patch(p1, pc);
- patch(p2, pc);
- goto com;
- case OEQ:
- case ONE:
- case OLE:
- case OLT:
- case OGE:
- case OGT:
- case OHI:
- case OHS:
- case OLO:
- case OLS:
- o = n->op;
- if(true)
- o = comrel[relindex(o)];
- if(l->complex >= FNX && r->complex >= FNX) {
- regret(&nod, r);
- cgen(r, &nod);
- regsalloc(&nod1, r);
- gopcode(OAS, &nod, Z, &nod1);
- regfree(&nod);
- nod = *n;
- nod.right = &nod1;
- boolgen(&nod, true, nn);
- break;
- }
- if(sconst(r)) {
- regalloc(&nod, l, nn);
- cgen(l, &nod);
- gopcode(o, &nod, Z, r);
- regfree(&nod);
- goto com;
- }
- if(l->complex >= r->complex) {
- regalloc(&nod1, l, nn);
- cgen(l, &nod1);
- regalloc(&nod, r, Z);
- cgen(r, &nod);
- } else {
- regalloc(&nod, r, nn);
- cgen(r, &nod);
- regalloc(&nod1, l, Z);
- cgen(l, &nod1);
- }
- gopcode(o, &nod1, Z, &nod);
- regfree(&nod);
- regfree(&nod1);
- com:
- if(nn != Z) {
- p1 = p;
- gopcode(OAS, nodconst(1L), Z, nn);
- gbranch(OGOTO);
- p2 = p;
- patch(p1, pc);
- gopcode(OAS, nodconst(0L), Z, nn);
- patch(p2, pc);
- }
- break;
- }
- cursafe = curs;
- }
- void
- sugen(Node *n, Node *nn, long w)
- {
- Prog *p1;
- Node nod0, nod1, nod2, nod3, nod4, *l, *r;
- Type *t;
- long pc1;
- int i, m, c;
- if(n == Z || n->type == T)
- return;
- if(debug['g']) {
- prtree(nn, "sugen lhs");
- prtree(n, "sugen");
- }
- if(nn == nodrat)
- if(w > nrathole)
- nrathole = w;
- switch(n->op) {
- case OIND:
- if(nn == Z) {
- nullwarn(n->left, Z);
- break;
- }
- default:
- goto copy;
- case OCONST:
- if(n->type && typev[n->type->etype]) {
- if(nn == Z) {
- nullwarn(n->left, Z);
- break;
- }
- t = nn->type;
- nn->type = types[TLONG];
- reglcgen(&nod1, nn, Z);
- nn->type = t;
- if(align(0, types[TCHAR], Aarg1)) /* isbigendian */
- gopcode(OAS, nod32const(n->vconst>>32), Z, &nod1);
- else
- gopcode(OAS, nod32const(n->vconst), Z, &nod1);
- nod1.xoffset += SZ_LONG;
- if(align(0, types[TCHAR], Aarg1)) /* isbigendian */
- gopcode(OAS, nod32const(n->vconst), Z, &nod1);
- else
- gopcode(OAS, nod32const(n->vconst>>32), Z, &nod1);
- regfree(&nod1);
- break;
- }
- goto copy;
- case ODOT:
- l = n->left;
- sugen(l, nodrat, l->type->width);
- if(nn != Z) {
- warn(n, "non-interruptable temporary");
- nod1 = *nodrat;
- r = n->right;
- if(!r || r->op != OCONST) {
- diag(n, "DOT and no offset");
- break;
- }
- nod1.xoffset += (long)r->vconst;
- nod1.type = n->type;
- sugen(&nod1, nn, w);
- }
- break;
- case OSTRUCT:
- /*
- * rewrite so lhs has no fn call
- */
- if(nn != Z && nn->complex >= FNX) {
- nod1 = *n;
- nod1.type = typ(TIND, n->type);
- regret(&nod2, &nod1);
- lcgen(nn, &nod2);
- regsalloc(&nod0, &nod1);
- gopcode(OAS, &nod2, Z, &nod0);
- regfree(&nod2);
- nod1 = *n;
- nod1.op = OIND;
- nod1.left = &nod0;
- nod1.right = Z;
- nod1.complex = 1;
- sugen(n, &nod1, w);
- return;
- }
- r = n->left;
- for(t = n->type->link; t != T; t = t->down) {
- l = r;
- if(r->op == OLIST) {
- l = r->left;
- r = r->right;
- }
- if(nn == Z) {
- cgen(l, nn);
- continue;
- }
- /*
- * hand craft *(&nn + o) = l
- */
- nod0 = znode;
- nod0.op = OAS;
- nod0.type = t;
- nod0.left = &nod1;
- nod0.right = l;
- nod1 = znode;
- nod1.op = OIND;
- nod1.type = t;
- nod1.left = &nod2;
- nod2 = znode;
- nod2.op = OADD;
- nod2.type = typ(TIND, t);
- nod2.left = &nod3;
- nod2.right = &nod4;
- nod3 = znode;
- nod3.op = OADDR;
- nod3.type = nod2.type;
- nod3.left = nn;
- nod4 = znode;
- nod4.op = OCONST;
- nod4.type = nod2.type;
- nod4.vconst = t->offset;
- ccom(&nod0);
- acom(&nod0);
- xcom(&nod0);
- nod0.addable = 0;
- cgen(&nod0, Z);
- }
- break;
- case OAS:
- if(nn == Z) {
- if(n->addable < INDEXED)
- sugen(n->right, n->left, w);
- break;
- }
- /* BOTCH -- functions can clobber rathole */
- sugen(n->right, nodrat, w);
- warn(n, "non-interruptable temporary");
- sugen(nodrat, n->left, w);
- sugen(nodrat, nn, w);
- break;
- case OFUNC:
- if(nn == Z) {
- sugen(n, nodrat, w);
- break;
- }
- if(nn->op != OIND) {
- nn = new1(OADDR, nn, Z);
- nn->type = types[TIND];
- nn->addable = 0;
- } else
- nn = nn->left;
- n = new(OFUNC, n->left, new(OLIST, nn, n->right));
- n->type = types[TVOID];
- n->left->type = types[TVOID];
- cgen(n, Z);
- break;
- case OCOND:
- bcgen(n->left, 1);
- p1 = p;
- sugen(n->right->left, nn, w);
- gbranch(OGOTO);
- patch(p1, pc);
- p1 = p;
- sugen(n->right->right, nn, w);
- patch(p1, pc);
- break;
- case OCOMMA:
- cgen(n->left, Z);
- sugen(n->right, nn, w);
- break;
- }
- return;
- copy:
- if(nn == Z)
- return;
- if(n->complex >= FNX && nn->complex >= FNX) {
- t = nn->type;
- nn->type = types[TLONG];
- regialloc(&nod1, nn, Z);
- lcgen(nn, &nod1);
- regsalloc(&nod2, nn);
- nn->type = t;
- gopcode(OAS, &nod1, Z, &nod2);
- regfree(&nod1);
- nod2.type = typ(TIND, t);
- nod1 = nod2;
- nod1.op = OIND;
- nod1.left = &nod2;
- nod1.right = Z;
- nod1.complex = 1;
- nod1.type = t;
- sugen(n, &nod1, w);
- return;
- }
- if(n->complex > nn->complex) {
- t = n->type;
- n->type = types[TLONG];
- reglcgen(&nod1, n, Z);
- n->type = t;
- t = nn->type;
- nn->type = types[TLONG];
- reglcgen(&nod2, nn, Z);
- nn->type = t;
- } else {
- t = nn->type;
- nn->type = types[TLONG];
- reglcgen(&nod2, nn, Z);
- nn->type = t;
- t = n->type;
- n->type = types[TLONG];
- reglcgen(&nod1, n, Z);
- n->type = t;
- }
- w /= SZ_LONG;
- if(w <= 5) {
- layout(&nod1, &nod2, w, 0, Z);
- goto out;
- }
- /*
- * minimize space for unrolling loop
- * 3,4,5 times. (6 or more is never minimum)
- * if small structure, try 2 also.
- */
- c = 0; /* set */
- m = 100;
- i = 3;
- if(w <= 15)
- i = 2;
- for(; i<=5; i++)
- if(i + w%i <= m) {
- c = i;
- m = c + w%c;
- }
- regalloc(&nod3, ®node, Z);
- layout(&nod1, &nod2, w%c, w/c, &nod3);
-
- pc1 = pc;
- layout(&nod1, &nod2, c, 0, Z);
- gopcode(OSUB, nodconst(1L), Z, &nod3);
- nod1.op = OREGISTER;
- gopcode(OADD, nodconst(c*SZ_LONG), Z, &nod1);
- nod2.op = OREGISTER;
- gopcode(OADD, nodconst(c*SZ_LONG), Z, &nod2);
-
- gopcode(OGT, &nod3, Z, nodconst(0));
- patch(p, pc1);
- regfree(&nod3);
- out:
- regfree(&nod1);
- regfree(&nod2);
- }
- void
- layout(Node *f, Node *t, int c, int cv, Node *cn)
- {
- Node t1, t2;
- while(c > 3) {
- layout(f, t, 2, 0, Z);
- c -= 2;
- }
- regalloc(&t1, ®node, Z);
- regalloc(&t2, ®node, Z);
- if(c > 0) {
- gopcode(OAS, f, Z, &t1);
- f->xoffset += SZ_LONG;
- }
- if(cn != Z)
- gopcode(OAS, nodconst(cv), Z, cn);
- if(c > 1) {
- gopcode(OAS, f, Z, &t2);
- f->xoffset += SZ_LONG;
- }
- if(c > 0) {
- gopcode(OAS, &t1, Z, t);
- t->xoffset += SZ_LONG;
- }
- if(c > 2) {
- gopcode(OAS, f, Z, &t1);
- f->xoffset += SZ_LONG;
- }
- if(c > 1) {
- gopcode(OAS, &t2, Z, t);
- t->xoffset += SZ_LONG;
- }
- if(c > 2) {
- gopcode(OAS, &t1, Z, t);
- t->xoffset += SZ_LONG;
- }
- regfree(&t1);
- regfree(&t2);
- }
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