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1.1 root 1: static char sccsid[] = "@(#)c21.c 4.3 10/17/80";
2: /* char C21[] = {"@(#)c21.c 1.83 80/10/16 21:18:22 JFR"}; /* sccs ident */
3:
4: /*
5: * C object code improver-- second part
6: */
7:
8: #include "c2.h"
9: #include <stdio.h>
10: #include <ctype.h>
11:
12: #define NUSE 6
13: int ioflag;
14: int biti[NUSE] = {1,2,4,8,16,32};
15: int bitsize[4] = {0,8,16,32}; /* index by type codes */
16: int pos,siz; long f; /* for bit field communication */
17: struct node *uses[NUSE]; /* for backwards flow analysis */
18: char *lastrand; /* last operand of instruction */
19: struct node *bflow();
20: struct node *bicopt();
21: char *findcon();
22:
23: redun3(p,split) register struct node *p; int split; {
24: /* check for 3 addr instr which should be 2 addr */
25: if (OP3==((p->subop>>4)&0xF)) {
26: if (split) splitrand(p);
27: if (equstr(regs[RT1],regs[RT3])
28: && (p->op==ADD || p->op==MUL || p->op==BIS || p->op==XOR)) {
29: register char *t=regs[RT1]; regs[RT1]=regs[RT2]; regs[RT2]=t;
30: }
31: if (equstr(regs[RT2],regs[RT3])) {
32: p->subop=(p->subop&0xF)|(OP2<<4); p->pop=0;
33: lastrand=regs[RT2]; *regs[RT3]=0; return(1);
34: }
35: } return(0);
36: }
37:
38: bmove() {
39: register struct node *p, *lastp; register char *cp1,*cp2; register int r;
40: refcount();
41: for (p=lastp= &first; 0!=(p=p->forw); lastp=p);
42: clearreg(); clearuse();
43: for (p=lastp; p!= &first; p=p->back) {
44: if (debug) {
45: printf("Uses:\n");
46: for (r=NUSE;--r>=0;) if (uses[r])
47: printf("%d: %s\n",r,uses[r]->code? uses[r]->code:"");
48: printf("-\n");
49: }
50: r=(p->subop>>4)&0xF;
51: if (OP2==r && (cp1=p->code, *cp1++)=='$' && *cp1++=='0' && *cp1++==',' &&
52: !source(cp1)) {/* a no-op unless MUL or DIV */
53: if (p->op==MUL) {p->op=MOV; p->subop&=0xF; p->pop=0;}
54: else if (p->op==DIV) fprintf(stderr,"c2: zero divide\n");
55: else {delnode(p); redunm++; continue;}
56: }
57: if (OP3==r && 0!=redun3(p,1)) {newcode(p); redunm++;}
58: switch (p->op) {
59: case LABEL: case DLABEL:
60: for (r=NUSE; --r>=0;)
61: if (uses[r]) p->ref=(struct node *) (((int)p->ref)|biti[r]);
62: break;
63: case CALLS:
64: clearuse(); goto std;
65: case 0:
66: clearuse(); break;
67: case SUB:
68: if ((p->subop&0xF)!=LONG) goto std; cp1=p->code;
69: if (*cp1++!='$') goto std; splitrand(p);
70: if (equstr(regs[RT2],"fp") && !indexa(regs[RT1])) {/* address comp. */
71: char buf[50]; cp2=buf; *cp2++='-';
72: cp1=regs[RT1]+1; while (*cp2++= *cp1++); --cp2;
73: cp1="(fp),"; while (*cp2++= *cp1++); --cp2;
74: cp1=regs[RT3]; while (*cp2++= *cp1++);
75: p->code=copy(buf); p->combop=T(MOVA,LONG); p->pop=0;
76: } else if (*cp1++=='-' && 0<=(r=getnum(cp1))) {
77: p->op=ADD; p->pop=0; *--cp1='$'; p->code=cp1;
78: } goto std;
79: case ADD:
80: if ((p->subop&0xF)!=LONG) goto std; cp1=p->code;
81: if (*cp1++!='$') goto std; splitrand(p);
82: if (isstatic(cp1) && (r=isreg(regs[RT2]))>=0 && r<NUSE && uses[r]==p->forw)
83: {
84: /* address comp:
85: ** addl2 $_foo,r0 \ movab _foo[r0],bar
86: ** movl r0,bar /
87: */
88: register struct node *pnext = p->forw;
89: char buf[50];
90:
91: if (pnext->op == MOV && pnext->subop == LONG)
92: {
93: cp1 = ®s[RT1][1]; cp2 = &buf[0];
94: while (*cp2++ = *cp1++) ; cp2--;
95: splitrand(pnext);
96: if (r == isreg(regs[RT1]))
97: {
98: delnode(p); p = pnext;
99: p->op = MOVA; p->subop = BYTE;
100: p->pop = 0;
101: cp1 = regs[RT1]; *cp2++ = '[';
102: while (*cp2++ = *cp1++) ; cp2--;
103: *cp2++ = ']'; *cp2++ = ',';
104: cp1 = regs[RT2];
105: while (*cp2++ = *cp1++) ;
106: p->code = copy(buf);
107: }
108: }
109: }
110: else
111: if (equstr(regs[RT2],"fp") && !indexa(regs[RT1])) {/* address comp. */
112: cp2=cp1-1; cp1=regs[RT1]+1; while (*cp2++= *cp1++); --cp2;
113: cp1="(fp)"; while (*cp2++= *cp1++); *--cp2=',';
114: p->combop=T(MOVA,LONG); p->pop=0;
115: } else if (*cp1++=='-' && 0<=(r=getnum(cp1))) {
116: p->op=SUB; p->pop=0; *--cp1='$'; p->code=cp1;
117: }
118: /* fall thru ... */
119: case CASE:
120: default: std:
121: p=bflow(p); break;
122: case MUL:
123: {
124: /*
125: ** Change multiplication by constant powers of 2 to
126: ** shifts.
127: */
128: splitrand(p);
129: if (regs[RT1][0] != '$' || regs[RT1][1] == '-') goto std;
130: if ((r = ispow2(getnum(®s[RT1][1]))) < 0) goto std;
131: switch (r)
132: {
133: case 0: /* mull3 $1,x,y */
134: if (p->subop == U(LONG,OP3))
135: {
136: if (equstr(regs[RT2], regs[RT3]))
137: {
138: delnode(p); p = p->forw;
139: }
140: else
141: {
142: p->op = MOV; p->subop = LONG;
143: p->pop = 0; newcode(p); nchange++;
144: }
145: }
146: else
147: if (p->subop == U(LONG,OP2))
148: {
149: delnode(p); p = p->forw;
150: }
151: goto std;
152:
153: case 1: /* mull2 $2,x */
154: if (p->subop == U(LONG, OP2) && !source(regs[RT2]))
155: {
156: strcpy(regs[RT1], regs[RT2]);
157: p->op = ADD; p->pop = 0; newcode(p); nchange++;
158: }
159: goto std;
160: }
161: if(p->subop==U(LONG,OP3)||(p->subop==U(LONG,OP2)&&!source(regs[RT2])))
162: {
163: if (p->subop == U(LONG,OP2))
164: strcpy(regs[RT3], regs[RT2]);
165: sprintf(regs[RT1], "$%d", r);
166: p->op = ASH; p->subop = LONG;
167: p->pop = 0; newcode(p); nchange++;
168: }
169: goto std;
170: }
171: case ASH:
172: {
173: /* address comp:
174: ** ashl $1,bar,r0 \ movl bar,r0
175: ** movab _foo[r0] / movaw _foo[r0]
176: **
177: ** ashl $2,r0,r0 \ moval _foo[r0]
178: ** movab _foo[r0] /
179: */
180: register struct node *pf;
181: register int shfrom, shto;
182: long shcnt;
183: char *regfrom;
184:
185: splitrand(p);
186: if (regs[RT1][0] != '$') goto std;
187: if ((shcnt = getnum(®s[RT1][1])) < 1 || shcnt > 3) goto std;
188: if ((shfrom = isreg(regs[RT2])) >= 0)
189: regfrom = copy(regs[RT2],"]");
190: if ((shto = isreg(regs[RT3])) >= 0 && shto<NUSE)
191: {
192: int regnum;
193:
194: if (uses[shto] != (pf = p->forw)) goto ashadd;
195: if (pf->op != MOVA && pf->op != PUSHA) goto ashadd;
196: if (pf->subop != BYTE) goto ashadd;
197: splitrand(pf);
198: if (!indexa(regs[RT1])) goto std;
199: cp2 = regs[RT1];
200: if(!isstatic(cp2)) goto std;
201: while (*cp2++ != '[') ;
202: if (*cp2++ != 'r' || !isdigit(*cp2)) goto std;
203: regnum = *cp2++ - '0';
204: if (isdigit(*cp2))
205: {
206: if (cp2[1] != ']') goto std;
207: regnum *= 10; regnum += *cp2 - '0';
208: }
209: if (regnum != shto) goto std;
210: if (shfrom >= 0) /* ashl $N,r*,r0 */
211: {
212: delnode(p);
213: if (shfrom != shto)
214: {
215: uses[shto] = NULL; splitrand(pf);
216: cp2=regs[RT1]; while (*cp2++!='[');
217: cp1=regfrom; while (*cp2++= *cp1++);
218: newcode(pf);
219: }
220: }
221: else
222: {
223: p->op = MOV; splitrand(p);
224: strcpy(regs[RT1], regs[RT2]);
225: strcpy(regs[RT2], regs[RT3]);
226: regs[RT3][0] = '\0';
227: p->pop = 0; newcode(p);
228: }
229: switch (shcnt)
230: {
231: case 1: pf->subop = WORD; break;
232: case 2: pf->subop = LONG; break;
233: case 3: pf->subop = QUAD; break;
234: }
235: redunm++; nsaddr++; nchange++;
236: }
237: goto std;
238: ashadd:
239: /* at this point, RT2 and RT3 are guaranteed to be simple regs*/
240: if (shcnt == 1 && equstr(regs[RT2], regs[RT3]))
241: {
242: /*
243: ** quickie:
244: ** ashl $1,A,A > addl2 A,A
245: */
246: p->op = ADD; p->subop = U(LONG,OP2); p->pop = 0;
247: strcpy(regs[RT1], regs[RT2]); regs[RT3][0] = '\0';
248: newcode(p); nchange++;
249: }
250: goto std;
251: }
252:
253: case EXTV:
254: case EXTZV:
255: {
256: /* bit tests:
257: ** extv A,$1,B,rC \
258: ** tstl rC > jbc A,B,D
259: ** jeql D /
260: **
261: ** also byte- and word-size fields:
262: ** extv $n*8,$8,A,B > cvtbl n+A,B
263: ** extv $n*16,$16,A,B > cvtwl n+A,B
264: ** extzv $n*8,$8,A,B > movzbl n+A,B
265: ** extzv $n*16,$16,A,B > movzwl n+A,B
266: */
267: register struct node *pf; /* forward node */
268: register struct node *pn; /* next node (after pf) */
269: int flen; /* field length */
270:
271: splitrand(p);
272: if (regs[RT2][0] != '$') goto std;
273: if ((flen = getnum(®s[RT2][1])) < 0) goto std;
274: if (flen == 1)
275: {
276: register int extreg; /* reg extracted to */
277:
278: extreg = isreg(regs[RT4]);
279: if (extreg < 0 || extreg >= NUSE) goto std;
280: if ((pf = p->forw)->op != TST) goto std;
281: if (uses[extreg] && uses[extreg] != pf) goto std;
282: splitrand(pf);
283: if (extreg != isreg(regs[RT1])) goto std;
284: if ((pn = pf->forw)->op != CBR) goto std;
285: if (pn->subop != JEQ && pn->subop != JNE) goto std;
286: delnode(p); delnode(pf);
287: pn->subop = (pn->subop == JEQ) ? JBC : JBS;
288: for(cp2=p->code; *cp2++!=',';);
289: for(cp1=cp2; *cp1++!=',';);
290: while (*cp1!=',') *cp2++= *cp1++; *cp2='\0';
291: pn->code = p->code; pn->pop = NULL;
292: uses[extreg] = NULL;
293: }
294: else
295: if (flen == 8 || flen == 16)
296: {
297: register int boff; /* bit offset */
298: register int coff; /* chunk (byte or word) offset*/
299:
300: if (regs[RT1][0] != '$') goto std;
301: if ((boff = getnum(®s[RT1][1])) < 0) goto std;
302: coff = boff / flen;
303: if (coff && (isreg(regs[RT3]) >= 0)) goto std;
304: if (boff < 0 || (boff % flen) != 0) goto std;
305: p->op = (p->op == EXTV) ? CVT : MOVZ;
306: p->subop = U((flen == 8 ? BYTE : WORD), LONG);
307: if (coff == 0)
308: strcpy(regs[RT1], regs[RT3]);
309: else
310: sprintf(regs[RT1], "%d%s%s", coff, regs[RT3][0]=='(' ? "":"+",
311: regs[RT3]);
312: strcpy(regs[RT2], regs[RT4]);
313: regs[RT3][0] = '\0'; regs[RT4][0] = '\0';
314: p->pop = 0; newcode(p);
315: }
316: nchange++;
317: goto std;
318: }
319:
320: case CMP:
321: {
322: /* comparison to -63 to -1:
323: ** cmpl r0,$-1 > incl r0
324: ** jeql ...
325: **
326: ** cmpl r0,$-63 > addl2 $63,r0
327: ** jeql ...
328: */
329: register int num;
330: register int reg;
331: register struct node *regp = p->back;
332:
333: if (p->forw->op != CBR) goto std;
334: if (p->forw->subop != JEQ && p->forw->subop != JNE) goto std;
335: splitrand(p);
336: if (strncmp(regs[RT2], "$-", 2) != 0) goto std;
337: reg = r = isreg(regs[RT1]);
338: if (r < 0) goto std;
339: if (r < NUSE && uses[r] != 0) goto std;
340: if (r >= NUSE && regp->op == MOV && p->subop == regp->subop)
341: {
342: if (*regp->code != 'r') goto std;
343: reg = regp->code[1] - '0';
344: if (isdigit(regp->code[2]) || reg >= NUSE || uses[reg])
345: goto std;
346: }
347: if (r >= NUSE) goto std;
348: if (reg != r)
349: sprintf(regs[RT1], "r%d", reg);
350: if ((num = getnum(®s[RT2][2])) <= 0 || num > 63) goto std;
351: if (num == 1)
352: {
353: p->op = INC; regs[RT2][0] = '\0';
354: }
355: else
356: {
357: register char *t;
358:
359: t=regs[RT1];regs[RT1]=regs[RT2];regs[RT2]=t;
360: p->op = ADD; p->subop = U(p->subop, OP2);
361: for (t = ®s[RT1][2]; t[-1] = *t; t++) ;
362: }
363: p->pop = 0; newcode(p);
364: nchange++;
365: goto std;
366: }
367:
368: case JSB:
369: if (equstr(p->code,"mcount")) {uses[0]=p; regs[0][0]= -1;}
370: goto std;
371: case JBR: case JMP:
372: clearuse();
373: if (p->subop==RET || p->subop==RSB) {uses[0]=p; regs[0][0]= -1; break;}
374: if (p->ref==0) goto std; /* jmp (r0) */
375: /* fall through */
376: case CBR:
377: if (p->ref->ref!=0) for (r=NUSE;--r>=0;)
378: if (biti[r] & (int)p->ref->ref) {uses[r]=p; regs[r][0]= -1;}
379: case EROU: case JSW:
380: case TEXT: case DATA: case BSS: case ALIGN: case WGEN: case END: ;
381: }
382: }
383: for (p= &first; p!=0; p=p->forw)
384: if (p->op==LABEL || p->op==DLABEL) p->ref=0; /* erase our tracks */
385: }
386:
387: rmove()
388: {
389: register struct node *p, *lastp;
390: register int r;
391: int r1;
392:
393: clearreg();
394: for (p=first.forw; p!=0; p = p->forw) {
395: lastp=p;
396: if (debug) {
397: printf("Regs:\n");
398: for (r=0; r<NREG; r++)
399: if (regs[r][0]) {
400: r1=regs[r][0];
401: printf("%d: %d%d %s\n", r, r1&0xF, r1>>4, regs[r]+1);
402: }
403: printf("-\n");
404: }
405: switch (p->op) {
406:
407: case CVT:
408: splitrand(p); goto mov;
409:
410: case MOV:
411: splitrand(p);
412: if ((r = findrand(regs[RT1],p->subop)) >= 0) {
413: if (r == isreg(regs[RT2]) && p->forw->op!=CBR) {
414: delnode(p); redunm++; break;
415: }
416: }
417: mov:
418: repladdr(p);
419: r = isreg(regs[RT1]);
420: r1 = isreg(regs[RT2]);
421: dest(regs[RT2],p->subop);
422: if (r>=0) {
423: if (r1>=0) savereg(r1, regs[r]+1, p->subop);
424: else if (p->op!=CVT) savereg(r, regs[RT2], p->subop);
425: } else if (r1>=0) savereg(r1, regs[RT1], p->subop);
426: else if (p->op!=CVT) setcon(regs[RT1], regs[RT2], p->subop);
427: break;
428:
429: /* .rx,.wx */
430: case MFPR:
431: case COM:
432: case NEG:
433: /* .rx,.wx or .rx,.rx,.wx */
434: case ADD:
435: case SUB:
436: case BIC:
437: case BIS:
438: case XOR:
439: case MUL:
440: case DIV:
441: case ASH:
442: case MOVZ:
443: /* .rx,.rx,.rx,.wx */
444: case EXTV:
445: case EXTZV:
446: case INSV:
447: splitrand(p);
448: repladdr(p);
449: dest(lastrand,p->subop);
450: if (p->op==INSV) ccloc[0]=0;
451: break;
452:
453: /* .mx or .wx */
454: case CLR:
455: case INC:
456: case DEC:
457: splitrand(p);
458: dest(lastrand,p->subop);
459: if (p->op==CLR)
460: if ((r = isreg(regs[RT1])) >= 0)
461: savereg(r, "$0", p->subop);
462: else
463: setcon("$0", regs[RT1], p->subop);
464: break;
465:
466: /* .rx */
467: case TST:
468: case PUSH:
469: splitrand(p);
470: lastrand=regs[RT1+1]; /* fool repladdr into doing 1 operand */
471: repladdr(p);
472: if (p->op==TST && equstr(lastrand=regs[RT1], ccloc+1)
473: && ((0xf&(ccloc[0]>>4))==p->subop || equtype(ccloc[0],p->subop))
474: &&!source(lastrand)) {
475: delnode(p); p = p->back; nrtst++; nchange++;
476: }
477: setcc(lastrand,p->subop);
478: break;
479:
480: /* .rx,.rx,.rx */
481: case PROBER:
482: case PROBEW:
483: case CASE:
484: case MOVC3:
485: /* .rx,.rx */
486: case MTPR:
487: case CALLS:
488: case CMP:
489: case BIT:
490: splitrand(p);
491: /* fool repladdr into doing right number of operands */
492: if (p->op==CASE || p->op==MOVC3 || p->op==PROBER || p->op==PROBEW)
493: lastrand=regs[RT4];
494: else lastrand=regs[RT3];
495: repladdr(p);
496: if (p->op==CALLS || p->op==MOVC3) clearreg();
497: if (p->op==BIT) bitopt(p);
498: ccloc[0]=0; break;
499:
500: case CBR:
501: if (p->subop>=JBC) {
502: splitrand(p);
503: if (p->subop<JBCC) lastrand=regs[RT3]; /* 2 operands can be optimized */
504: else lastrand=regs[RT2]; /* .mb destinations lose */
505: repladdr(p);
506: }
507: ccloc[0] = 0;
508: break;
509:
510: case JBR:
511: redunbr(p);
512:
513: /* .wx,.bb */
514: case SOB:
515:
516: default:
517: clearreg();
518: }
519: }
520: }
521:
522: char *
523: byondrd(p) register struct node *p; {
524: /* return pointer to register which is "beyond last read/modify operand" */
525: if (OP2==(p->subop>>4)) return(regs[RT3]);
526: switch (p->op) {
527: case MFPR:
528: case JSB:
529: case PUSHA:
530: case TST: case INC: case DEC: case PUSH: return(regs[RT2]);
531: case MTPR:
532: case BIT: case CMP: case CALLS: return(regs[RT3]);
533: case PROBER: case PROBEW:
534: case CASE: case MOVC3: return(regs[RT4]);
535: }
536: return(lastrand);
537: }
538:
539: struct node *
540: bflow(p)
541: register struct node *p;
542: {
543: register char *cp1,*cp2,**preg; register int r;
544: int flow= -1;
545: struct node *olduse=0;
546: splitrand(p);
547: if (p->op!=PUSH && p->subop && 0<=(r=isreg(lastrand)) && r<NUSE && uses[r]==p->forw) {
548: if (equtype(p->subop,regs[r][0])
549: || ((p->op==CVT || p->op==MOVZ)
550: && 0xf®s[r][0] && compat(0xf&(p->subop>>4),regs[r][0]))) {
551: register int r2;
552: if (regs[r][1]!=0) {/* send directly to destination */
553: if (p->op==INC || p->op==DEC) {
554: if (p->op==DEC) p->op=SUB; else p->op=ADD;
555: p->subop=(OP2<<4)+(p->subop&0xF); /* use 2 now, convert to 3 later */
556: p->pop=0;
557: cp1=lastrand; cp2=regs[RT2]; while (*cp2++= *cp1++); /* copy reg */
558: cp1=lastrand; *cp1++='$'; *cp1++='1'; *cp1=0;
559: }
560: cp1=regs[r]+1; cp2=lastrand;
561: if (OP2==(p->subop>>4)) {/* use 3 operand form of instruction */
562: p->pop=0;
563: p->subop += (OP3-OP2)<<4; lastrand=cp2=regs[RT3];
564: }
565: while (*cp2++= *cp1++);
566: if (p->op==MOVA && p->forw->op==PUSH) {
567: p->op=PUSHA; *regs[RT2]=0; p->pop=0;
568: } else if (p->op==MOV && p->forw->op==PUSH) {
569: p->op=PUSH ; *regs[RT2]=0; p->pop=0;
570: }
571: delnode(p->forw);
572: if (0<=(r2=isreg(lastrand)) && r2<NUSE) {
573: uses[r2]=uses[r]; uses[r]=0;
574: }
575: redun3(p,0);
576: newcode(p); redunm++; flow=r;
577: } else if (p->op==MOV && p->forw->op!=EXTV && p->forw->op!=EXTZV) {
578: /* superfluous fetch */
579: int nmatch;
580: char src[20];
581: movit:
582: cp2=src; cp1=regs[RT1]; while (*cp2++= *cp1++);
583: splitrand(p->forw);
584: if (p->forw->op != INC && p->forw->op != DEC)
585: lastrand=byondrd(p->forw);
586: nmatch=0;
587: for (preg=regs+RT1;*preg!=lastrand;preg++)
588: if (r==isreg(*preg)) {
589: cp2= *preg; cp1=src; while (*cp2++= *cp1++); ++nmatch;
590: }
591: if (nmatch==1) {
592: if (OP2==(p->forw->subop>>4) && equstr(src,regs[RT2])) {
593: p->forw->pop=0;
594: p->forw->subop += (OP3-OP2)<<4; cp1=regs[RT3];
595: *cp1++='r'; *cp1++=r+'0'; *cp1=0;
596: }
597: delnode(p); p=p->forw;
598: if (0<=(r2=isreg(src)) && r2<NUSE) {
599: uses[r2]=uses[r]; uses[r]=0;
600: }
601: redun3(p,0);
602: newcode(p); redunm++; flow=r;
603: } else splitrand(p);
604: }
605: } else if (p->op==MOV && (p->forw->op==CVT || p->forw->op==MOVZ)
606: && p->forw->subop&0xf /* if base or index, then forget it */
607: && compat(p->subop,p->forw->subop) && !source(cp1=regs[RT1])
608: && !indexa(cp1)) goto movit;
609: }
610: /* adjust 'lastrand' past any 'read' or 'modify' operands. */
611: lastrand=byondrd(p);
612: /* a 'write' clobbers the register. */
613: if (0<=(r=isreg(lastrand)) && r<NUSE
614: || OP2==(p->subop>>4) && 0<=(r=isreg(regs[RT2])) && r<NUSE && uses[r]==0) {
615: /* writing a dead register is useless, but watch side effects */
616: switch (p->op) {
617: case ACB:
618: case AOBLEQ: case AOBLSS: case SOBGTR: case SOBGEQ: break;
619: default:
620: if (uses[r]==0) {/* no direct uses, check for use of condition codes */
621: register struct node *q=p;
622: while ((q=nonlab(q->forw))->combop==JBR) q=q->ref; /* cc unused, unchanged */
623: if (q->op!=CBR) {/* ... and destroyed */
624: preg=regs+RT1;
625: while (cp1= *preg++) {
626: if (cp1==lastrand) {redunm++; delnode(p); return(p->forw);}
627: if (source(cp1) || equstr(cp1,lastrand)) break;
628: }
629: }
630: }
631: flow=r;
632: }
633: }
634: if (0<=(r=flow)) {olduse=uses[r]; uses[r]=0; *(short *)(regs[r])=0;}
635: /* these two are here, rather than in bmove(),
636: /* because I decided that it was better to go for 3-address code
637: /* (save time) rather than fancy jbxx (save 1 byte)
638: /* on sequences like bisl2 $64,r0; movl r0,foo
639: */
640: if (p->op==BIC) {p=bicopt(p); splitrand(p); lastrand=byondrd(p);}
641: if (p->op==BIS) {bixprep(p,JBSS); lastrand=byondrd(p);}
642: /* now look for 'read' or 'modify' (read & write) uses */
643: preg=regs+RT1;
644: while (*(cp1= *preg++)) {
645: /* check for r */
646: if (lastrand!=cp1 && 0<=(r=isreg(cp1)) && r<NUSE && uses[r]==0) {
647: uses[r]=p; cp2=regs[r]; *cp2++=p->subop;
648: if (p->op==ASH && preg==(regs+RT1+1)) cp2[-1]=BYTE; /* stupid DEC */
649: if (p->op==MOV || p->op==PUSH || p->op==CVT || p->op==MOVZ || p->op==COM || p->op==NEG) {
650: if (p->op==PUSH) cp1="-(sp)";
651: else {
652: cp1=regs[RT2];
653: if (0<=(r=isreg(cp1)) && r<NUSE && uses[r]==0)
654: uses[r]=olduse; /* reincarnation!! */
655: /* as in addl2 r0,r1; movl r1,r0; ret */
656: if (p->op!=MOV) cp1=0;
657: }
658: if (cp1) while (*cp2++= *cp1++);
659: else *cp2=0;
660: } else *cp2=0;
661: continue;
662: }
663: /* check for (r),(r)+,-(r),[r] */
664: do if (*cp1=='(' || *cp1=='[') {/* get register number */
665: char t;
666: cp2= ++cp1; while (*++cp1!=')' && *cp1!=']'); t= *cp1; *cp1=0;
667: if (0<=(r=isreg(cp2)) && r<NUSE && (uses[r]==0 || uses[r]==p)) {
668: uses[r]=p; regs[r][0]=(*--cp2=='[' ? OPX<<4 : OPB<<4);
669: }
670: *cp1=t;
671: } while (*++cp1);
672: }
673: /* pushax or movax possibility? */
674: cp1=regs[RT1];
675: if (*cp1++=='$' && isstatic(cp1) && natural(regs[RT1])) {
676: if (p->combop==T(MOV,LONG)) {
677: if (regs[RT1][1]=='L' && 0!=(p->labno=getnum(regs[RT1]+2))) {
678: cp1=p->code; while (*cp1++!=','); p->code= --cp1;
679: }
680: p->combop=T(MOVA,LONG); ++p->code; p->pop=0;
681: } else if (p->combop==T(PUSH,LONG)) {
682: p->combop=T(PUSHA,LONG); ++p->code; p->pop=0;
683: } else if ((p->combop&0xFFFF)==T(ADD,U(LONG,OP3))
684: && 0<=(r=isreg(regs[RT2]))) {
685: cp1=cp2=p->code; ++cp1;
686: do *cp2++= *cp1; while (*cp1++!=','); cp2[-1]='[';
687: do *cp2++= *cp1; while (*cp1++!=','); cp2[-1]=']';
688: if (!equstr(regs[RT3],"-(sp)")) p->combop=T(MOVA,BYTE);
689: else {p->combop=T(PUSHA,BYTE); *cp2=0;}
690: if (uses[r]==0) {uses[r]=p; regs[r][0]=OPX<<4;}
691: p->pop=0;
692: }
693: }
694: return(p);
695: }
696:
697: ispow2(n) register long n; {/* -1 -> no; else -> log to base 2 */
698: register int log;
699: if (n==0 || n&(n-1)) return(-1); log=0;
700: for (;;) {n >>= 1; if (n==0) return(log); ++log; if (n== -1) return(log);}
701: }
702:
703: bitopt(p) register struct node *p; {
704: /* change "bitx $<power_of_2>,a" followed by JEQ or JNE
705: /* into JBC or JBS. watch out for I/O registers. (?)
706: /* assumes that 'splitrand' has already been called.
707: */
708: register char *cp1,*cp2; int b;
709: cp1=regs[RT1]; cp2=regs[RT2];
710: if (*cp1++!='$' || !okio(cp2) || p->forw->op!=CBR || p->forw->subop&-2 ||
711: 0>(b=ispow2(getnum(cp1))) ||
712: p->subop!=BYTE && (source(cp2) || indexa(cp2))) return;
713: if (b>=bitsize[p->subop]) {/* you dummy! */
714: if (source(cp2)) {/* side effect: auto increment or decrement */
715: p->pop=0;
716: p->op=TST; --cp1; while (*cp1++= *cp2++);
717: regs[RT2][0]=0; newcode(p);
718: } else delnode(p);
719: p = p->forw;
720: if (p->subop==JEQ) {p->combop=JBR; p->pop=0;}
721: else delnode(p);
722: nchange++; nbj++; return;
723: }
724: if (cp1=p->forw->code) {/* destination is not an internal label */
725: cp2=regs[RT3]; while (*cp2++= *cp1++);
726: }
727: if (b==0 && (p->subop==LONG || !indexa(regs[RT2]))) {/* JLB optimization, ala BLISS */
728: cp2=regs[RT1]; cp1=regs[RT2]; while (*cp2++= *cp1++);
729: cp2=regs[RT2]; cp1=regs[RT3]; while (*cp2++= *cp1++);
730: *(regs[RT3])=0; p->forw->subop += JLBC-JBC;
731: p->forw->pop=0;
732: } else {
733: cp1=regs[RT1]+1;
734: if (b>9) *cp1++= b/10 +'0'; *cp1++= b%10 +'0'; *cp1=0; /* $<bit_number> */
735: }
736: nbj++; newcode(p); p->combop = p->forw->combop+((JBC-JEQ)<<8);
737: p->labno = p->forw->labno; delnode(p->forw);
738: p->pop=0;
739: }
740:
741: isfield(n) register long n; {/* -1 -> no; else -> position of low bit */
742: register int pos; register long t;
743: t= ((n-1)|n) +1;
744: if (n!=0 && (0==t || 0==n || 0<=ispow2(t))) {
745: pos=0; while(!(n&1)) {n >>= 1; ++pos;} return(pos);
746: } else return(-1);
747: }
748:
749: bixprep(p,bix) register struct node *p; {
750: /* initial setup, single-bit checking for bisopt, bicopt.
751: /* return: 0->don't bother any more; 1->worthwhile trying
752: */
753: register char *cp1,*cp2;
754: splitrand(p); cp1=regs[RT1]; cp2=regs[RT2];
755: if (*cp1++!='$' || 0>(pos=isfield(f=getnum(cp1)))
756: || !okio(cp2) || indexa(cp2) || source(cp2) || !okio(lastrand)) return(0);
757: f |= f-1; if (++f==0) siz=32-pos; else siz=ispow2(f)-pos;
758: if (siz==1 && pos>5 && (p->subop>>4)==OP2 && (p->subop&0xF)!=BYTE
759: && pos<bitsize[p->subop&0xF]) {
760: p->ref = insertl(p->forw); p->combop = CBR | (bix<<8);
761: p->pop=0;
762: p->labno = p->ref->labno;
763: if (pos>9) {*cp1++= pos/10 +'0'; pos %= 10;}
764: *cp1++=pos+'0'; *cp1=0; newcode(p); nbj++; return(0);
765: }
766: return(1);
767: }
768:
769:
770: struct node *
771: bicopt(p) register struct node *p; {
772: /* use field operations or MOVZ if possible. done as part of 'bflow'.
773: */
774: register char *cp1,*cp2; int r;
775: char src[50];
776: if (!bixprep(p,JBCC)) return(p);
777: if (f==0) {/* the BIC isolates low order bits */
778: siz=pos; pos=0;
779: if ((p->subop&0xF)==LONG && *(regs[RT2])!='$') {/* result of EXTZV is long */
780: /* save source of BICL in 'src' */
781: cp1=regs[RT2]; cp2=src; while (*cp2++= *cp1++);
782: if (p->back->op==ASH) {/* try for more */
783: splitrand(p->back); cp1=regs[RT1]; cp2=regs[RT3];
784: if (*cp1++=='$' && *(regs[RT2])!='$' && !indexa(regs[RT2])
785: && 0>(f=getnum(cp1)) && equstr(src,cp2)
786: && 0<=(r=isreg(cp2)) && r<NUSE) {/* a good ASH */
787: pos -= f; cp1=regs[RT2]; cp2=src; while (*cp2++= *cp1++);
788: delnode(p->back);
789: }
790: }
791: if (p->back->op==CVT || p->back->op==MOVZ) {/* greedy, aren't we? */
792: splitrand(p->back); cp1=regs[RT1]; cp2=regs[RT2];
793: if (equstr(src,cp2) && okio(cp1) && !indexa(cp1)
794: && 0<=(r=isreg(cp2)) && r<NUSE
795: && bitsize[p->back->subop&0xF]>=(pos+siz)
796: && bitsize[p->back->subop>>4]>=(pos+siz)) {/* good CVT */
797: cp1=regs[RT1]; cp2=src; while (*cp2++= *cp1++);
798: delnode(p->back);
799: }
800: }
801: /* 'pos', 'siz' known; source of field is in 'src' */
802: splitrand(p); /* retrieve destination of BICL */
803: if (siz==8 && pos==0) {
804: p->combop = T(MOVZ,U(BYTE,LONG));
805: sprintf(line,"%s,%s",src,lastrand);
806: } else {
807: p->combop = T(EXTZV,LONG);
808: sprintf(line,"$%d,$%d,%s,%s",pos,siz,src,lastrand);
809: }
810: p->pop=0;
811: p->code = copy(line); nfield++; return(p);
812: }/* end EXTZV possibility */
813: }/* end low order bits */
814: /* unfortunately, INSV clears the condition codes, thus cannot be used */
815: /* else {/* see if BICL2 of positive field should be INSV $0 */
816: /* if (p->subop==(LONG | (OP2<<4)) && 6<=(pos+siz)) {
817: /* p->combop = INSV;
818: /* sprintf(line,"$0,$%d,$%d,%s",pos,siz,lastrand);
819: /* p->code = copy(line); nfield++; return(p);
820: /* }
821: /* }
822: */
823: return(p);
824: }
825:
826: jumpsw()
827: {
828: register struct node *p, *p1;
829: register t;
830: int nj;
831:
832: t = 0;
833: nj = 0;
834: for (p=first.forw; p!=0; p = p->forw)
835: p->seq = ++t;
836: for (p=first.forw; p!=0; p = p1) {
837: p1 = p->forw;
838: if (p->op == CBR && p1->op==JBR && p->ref && p1->ref
839: && abs(p->seq - p->ref->seq) > abs(p1->seq - p1->ref->seq)) {
840: if (p->ref==p1->ref)
841: continue;
842: p->subop = revbr[p->subop];
843: p->pop=0;
844: t = p1->ref;
845: p1->ref = p->ref;
846: p->ref = t;
847: t = p1->labno;
848: p1->labno = p->labno;
849: p->labno = t;
850: #ifdef COPYCODE
851: if (p->labno == 0) {
852: t = p1->code; p1->code = p->code; p->code = t;
853: }
854: #endif
855: nrevbr++;
856: nj++;
857: }
858: }
859: return(nj);
860: }
861:
862: addsob()
863: {
864: register struct node *p, *p1, *p2, *p3;
865:
866: for (p = &first; (p1 = p->forw)!=0; p = p1) {
867: if (p->combop==T(DEC,LONG) && p1->op==CBR) {
868: if (abs(p->seq - p1->ref->seq) > 12) continue;
869: if (p1->subop==JGE || p1->subop==JGT) {
870: if (p1->subop==JGE) p->combop=SOBGEQ; else p->combop=SOBGTR;
871: p->pop=0;
872: p->labno = p1->labno; delnode(p1); nsob++;
873: }
874: } else if (p->combop==T(INC,LONG)) {
875: if (p1->op==LABEL && p1->refc==1 && p1->forw->combop==T(CMP,LONG)
876: && (p2=p1->forw->forw)->combop==T(CBR,JLE)
877: && (p3=p2->ref->back)->combop==JBR && p3->ref==p1
878: && p3->forw->op==LABEL && p3->forw==p2->ref) {
879: /* change INC LAB: CMP to LAB: INC CMP */
880: p->back->forw=p1; p1->back=p->back;
881: p->forw=p1->forw; p1->forw->back=p;
882: p->back=p1; p1->forw=p;
883: p1=p->forw;
884: /* adjust beginning value by 1 */
885: p2=alloc(sizeof first); p2->combop=T(DEC,LONG);
886: p2->pop=0;
887: p2->forw=p3; p2->back=p3->back; p3->back->forw=p2;
888: p3->back=p2; p2->code=p->code; p2->labno=0;
889: }
890: if (p1->combop==T(CMP,LONG) && (p2=p1->forw)->op==CBR) {
891: register char *cp1,*cp2;
892: splitrand(p1); if (!equstr(p->code,regs[RT1])) continue;
893: if (abs(p->seq - p2->ref->seq)>12) {/* outside byte displ range */
894: if (p2->subop!=JLE) continue;
895: p->combop=T(ACB,LONG);
896: cp2=regs[RT1]; cp1=regs[RT2]; while (*cp2++= *cp1++); /* limit */
897: cp2=regs[RT2]; cp1="$1"; while (*cp2++= *cp1++); /* increment */
898: cp2=regs[RT3]; cp1=p->code; while (*cp2++= *cp1++); /* index */
899: p->pop=0; newcode(p);
900: p->labno = p2->labno; delnode(p2); delnode(p1); nsob++;
901: } else if (p2->subop==JLE || p2->subop==JLT) {
902: if (p2->subop==JLE) p->combop=AOBLEQ; else p->combop=AOBLSS;
903: cp2=regs[RT1]; cp1=regs[RT2]; while (*cp2++= *cp1++); /* limit */
904: cp2=regs[RT2]; cp1=p->code; while (*cp2++= *cp1++); /* index */
905: p->pop=0; newcode(p);
906: p->labno = p2->labno; delnode(p2); delnode(p1); nsob++;
907: }
908: }
909: }
910: }
911: }
912:
913: abs(x)
914: {
915: return(x<0? -x: x);
916: }
917:
918: equop(p1, p2)
919: register struct node *p1;
920: struct node *p2;
921: {
922: register char *cp1, *cp2;
923:
924: if (p1->combop != p2->combop)
925: return(0);
926: if (p1->op>0 && p1->op<MOV)
927: return(0);
928: if (p1->op==MOVA && p1->labno!=p2->labno) return(0);
929: cp1 = p1->code;
930: cp2 = p2->code;
931: if (cp1==0 && cp2==0)
932: return(1);
933: if (cp1==0 || cp2==0)
934: return(0);
935: while (*cp1 == *cp2++)
936: if (*cp1++ == 0)
937: return(1);
938: return(0);
939: }
940:
941: delnode(p) register struct node *p; {
942: p->back->forw = p->forw;
943: p->forw->back = p->back;
944: }
945:
946: decref(p)
947: register struct node *p;
948: {
949: if (p && --p->refc <= 0) {
950: nrlab++;
951: delnode(p);
952: }
953: }
954:
955: struct node *
956: nonlab(ap)
957: struct node *ap;
958: {
959: register struct node *p;
960:
961: p = ap;
962: while (p && p->op==LABEL)
963: p = p->forw;
964: return(p);
965: }
966:
967: clearuse() {
968: register struct node **i;
969: for (i=uses+NUSE; i>uses;) *--i=0;
970: }
971:
972: clearreg() {
973: register short **i;
974: for (i=regs+NREG; i>regs;) **--i=0;
975: conloc[0] = 0; ccloc[0] = 0;
976: }
977:
978: savereg(ai, s, type)
979: register char *s;
980: {
981: register char *p, *sp;
982:
983: sp = p = regs[ai];
984: if (source(s)) /* side effects in addressing */
985: return;
986: /* if any indexing, must be parameter or local */
987: /* indirection (as in "*-4(fp)") is ok, however */
988: *p++ = type;
989: while (*p++ = *s)
990: if (*s=='[' || *s++=='(' && *s!='a' && *s!='f') {*sp = 0; return;}
991: }
992:
993: dest(s,type)
994: register char *s;
995: {
996: register int i;
997:
998: source(s); /* handle addressing side effects */
999: if ((i = isreg(s)) >= 0) {
1000: *(short *)(regs[i]) = 0; /* if register destination, that reg is a goner */
1001: if (DOUBLE==(type&0xF) || DOUBLE==((type>>4)&0xF))
1002: *(short *)(regs[i+1]) = 0; /* clobber two at once */
1003: }
1004: for (i=NREG; --i>=0;)
1005: if (regs[i][1]=='*' && equstr(s, regs[i]+2))
1006: *(short *)(regs[i]) = 0; /* previous indirection through destination is invalid */
1007: while ((i = findrand(s,0)) >= 0) /* previous values of destination are invalid */
1008: *(short *)(regs[i]) = 0;
1009: if (!natural(s)) {/* wild store, everything except constants vanishes */
1010: for (i=NREG; --i>=0;) if (regs[i][1] != '$') *(short *)(regs[i]) = 0;
1011: conloc[0] = 0; ccloc[0] = 0;
1012: } else setcc(s,type); /* natural destinations set condition codes */
1013: }
1014:
1015: splitrand(p) struct node *p; {
1016: /* separate operands at commas, set up 'regs' and 'lastrand' */
1017: register char *p1, *p2; register char **preg;
1018: preg=regs+RT1;
1019: if (p1=p->code) while (*p1) {
1020: lastrand=p2= *preg++;
1021: while (*p1) if (','==(*p2++= *p1++)) {--p2; break;}
1022: *p2=0;
1023: }
1024: while (preg<(regs+RT1+5)) *(*preg++)=0;
1025: }
1026:
1027: compat(have, want) {
1028: register int hsrc, hdst;
1029: if (0==(want &= 0xF)) return(1); /* anything satisfies a wildcard want */
1030: hsrc=have&0xF; if (0==(hdst=((have>>4)&0xF)) || hdst>=OP2) hdst=hsrc;
1031: if (want>=FLOAT) return(hdst==want && hsrc==want);
1032: /* FLOAT, DOUBLE not compat: rounding */
1033: return(hsrc>=want && hdst>=want && hdst<FLOAT);
1034: }
1035:
1036: equtype(t1,t2) {return(compat(t1,t2) && compat(t2,t1));}
1037:
1038: findrand(as, type)
1039: char *as;
1040: {
1041: register char **i;
1042: for (i = regs+NREG; --i>=regs;) {
1043: if (**i && equstr(*i+1, as) && compat(**i,type))
1044: return(i-regs);
1045: }
1046: return(-1);
1047: }
1048:
1049: isreg(s)
1050: register char *s;
1051: {
1052: if (*s++!='r' || !isdigit(*s++)) return(-1);
1053: if (*s==0) return(*--s-'0');
1054: if (*(s-1)=='1' && isdigit(*s++) && *s==0) return(10+*--s-'0');
1055: return(-1);
1056: }
1057:
1058: check()
1059: {
1060: register struct node *p, *lp;
1061:
1062: lp = &first;
1063: for (p=first.forw; p!=0; p = p->forw) {
1064: if (p->back != lp)
1065: abort(-1);
1066: lp = p;
1067: }
1068: }
1069:
1070: source(ap)
1071: char *ap;
1072: {
1073: register char *p1, *p2;
1074:
1075: p1 = ap;
1076: p2 = p1;
1077: if (*p1==0)
1078: return(0);
1079: while (*p2++ && *(p2-1)!='[');
1080: if (*p1=='-' && *(p1+1)=='('
1081: || *p1=='*' && *(p1+1)=='-' && *(p1+2)=='('
1082: || *(p2-2)=='+') {
1083: while (*p1 && *p1++!='r');
1084: if (isdigit(*p1++))
1085: if (isdigit(*p1)) *(short *)(regs[10+*p1-'0'])=0;
1086: else *(short *)(regs[*--p1-'0'])=0;
1087: return(1);
1088: }
1089: return(0);
1090: }
1091:
1092: newcode(p) struct node *p; {
1093: register char *p1,*p2,**preg;
1094: preg=regs+RT1; p2=line;
1095: while (*(p1= *preg++)) {while (*p2++= *p1++); *(p2-1)=',';}
1096: *--p2=0;
1097: p->code=copy(line);
1098: }
1099:
1100: repladdr(p)
1101: struct node *p;
1102: {
1103: register r;
1104: register char *p1, *p2;
1105: char **preg; int nrepl;
1106:
1107: preg=regs+RT1; nrepl=0;
1108: while (lastrand!=(p1= *preg++))
1109: if (!source(p1) && 0<=(r=findrand(p1,p->subop))) {
1110: *p1++='r'; if (r>9) {*p1++='1'; r -= 10;} *p1++=r+'0'; *p1=0;
1111: nrepl++; nsaddr++;
1112: }
1113: if (nrepl) newcode(p);
1114: }
1115:
1116: /* movedat()
1117: /* {
1118: /* register struct node *p1, *p2;
1119: /* struct node *p3;
1120: /* register seg;
1121: /* struct node data;
1122: /* struct node *datp;
1123: /*
1124: /* if (first.forw == 0)
1125: /* return;
1126: /* datp = &data;
1127: /* for (p1 = first.forw; p1!=0; p1 = p1->forw) {
1128: /* if (p1->op == DATA) {
1129: /* p2 = p1->forw;
1130: /* while (p2 && p2->op!=TEXT)
1131: /* p2 = p2->forw;
1132: /* if (p2==0)
1133: /* break;
1134: /* p3 = p1->back;
1135: /* p1->back->forw = p2->forw;
1136: /* p2->forw->back = p3;
1137: /* p2->forw = 0;
1138: /* datp->forw = p1;
1139: /* p1->back = datp;
1140: /* p1 = p3;
1141: /* datp = p2;
1142: /* }
1143: /* }
1144: /* if (data.forw) {
1145: /* datp->forw = first.forw;
1146: /* first.forw->back = datp;
1147: /* data.forw->back = &first;
1148: /* first.forw = data.forw;
1149: /* }
1150: /* seg = -1;
1151: /* for (p1 = first.forw; p1!=0; p1 = p1->forw) {
1152: /* if (p1->op==TEXT||p1->op==DATA||p1->op==BSS) {
1153: /* if (p1->op == seg || p1->forw&&p1->forw->op==seg) {
1154: /* p1->back->forw = p1->forw;
1155: /* p1->forw->back = p1->back;
1156: /* p1 = p1->back;
1157: /* continue;
1158: /* }
1159: /* seg = p1->op;
1160: /* }
1161: /* }
1162: /* }
1163: */
1164:
1165: redunbr(p)
1166: register struct node *p;
1167: {
1168: register struct node *p1;
1169: register char *ap1;
1170: char *ap2;
1171:
1172: if ((p1 = p->ref) == 0)
1173: return;
1174: p1 = nonlab(p1);
1175: if (p1->op==TST) {
1176: splitrand(p1);
1177: savereg(RT2, "$0", p1->subop);
1178: } else if (p1->op==CMP)
1179: splitrand(p1);
1180: else
1181: return;
1182: if (p1->forw->op==CBR) {
1183: ap1 = findcon(RT1, p1->subop);
1184: ap2 = findcon(RT2, p1->subop);
1185: p1 = p1->forw;
1186: if (compare(p1->subop, ap1, ap2)) {
1187: nredunj++;
1188: nchange++;
1189: decref(p->ref);
1190: p->ref = p1->ref;
1191: p->labno = p1->labno;
1192: #ifdef COPYCODE
1193: if (p->labno == 0)
1194: p->code = p1->code;
1195: if (p->ref)
1196: #endif
1197: p->ref->refc++;
1198: }
1199: } else if (p1->op==TST && equstr(regs[RT1],ccloc+1) &&
1200: equtype(ccloc[0],p1->subop)) {
1201: p1=insertl(p1->forw); decref(p->ref); p->ref=p1;
1202: nrtst++; nchange++;
1203: }
1204: }
1205:
1206: char *
1207: findcon(i, type)
1208: {
1209: register char *p;
1210: register r;
1211:
1212: p = regs[i];
1213: if (*p=='$')
1214: return(p);
1215: if ((r = isreg(p)) >= 0 && compat(regs[r][0],type))
1216: return(regs[r]+1);
1217: if (equstr(p, conloc))
1218: return(conval+1);
1219: return(p);
1220: }
1221:
1222: compare(op, acp1, acp2)
1223: char *acp1, *acp2;
1224: {
1225: register char *cp1, *cp2;
1226: register n1;
1227: int n2; int sign;
1228:
1229: cp1 = acp1;
1230: cp2 = acp2;
1231: if (*cp1++ != '$' || *cp2++ != '$')
1232: return(0);
1233: n1 = 0; sign=1; if (*cp2=='-') {++cp2; sign= -1;}
1234: while (isdigit(*cp2)) {n1 *= 10; n1 += (*cp2++ - '0')*sign;}
1235: n2 = n1;
1236: n1 = 0; sign=1; if (*cp1=='-') {++cp1; sign= -1;}
1237: while (isdigit(*cp1)) {n1 *= 10; n1 += (*cp1++ - '0')*sign;}
1238: if (*cp1=='+')
1239: cp1++;
1240: if (*cp2=='+')
1241: cp2++;
1242: do {
1243: if (*cp1++ != *cp2)
1244: return(0);
1245: } while (*cp2++);
1246: cp1 = n1;
1247: cp2 = n2;
1248: switch(op) {
1249:
1250: case JEQ:
1251: return(cp1 == cp2);
1252: case JNE:
1253: return(cp1 != cp2);
1254: case JLE:
1255: return(((int)cp1) <= ((int)cp2));
1256: case JGE:
1257: return(((int)cp1) >= ((int)cp2));
1258: case JLT:
1259: return(((int)cp1) < ((int)cp2));
1260: case JGT:
1261: return(((int)cp1) > ((int)cp2));
1262: case JLO:
1263: return(cp1 < cp2);
1264: case JHI:
1265: return(cp1 > cp2);
1266: case JLOS:
1267: return(cp1 <= cp2);
1268: case JHIS:
1269: return(cp1 >= cp2);
1270: }
1271: return(0);
1272: }
1273:
1274: setcon(cv, cl, type)
1275: register char *cv, *cl;
1276: {
1277: register char *p;
1278:
1279: if (*cv != '$')
1280: return;
1281: if (!natural(cl))
1282: return;
1283: p = conloc;
1284: while (*p++ = *cl++);
1285: p = conval;
1286: *p++ = type;
1287: while (*p++ = *cv++);
1288: }
1289:
1290: equstr(p1, p2)
1291: register char *p1, *p2;
1292: {
1293: do {
1294: if (*p1++ != *p2)
1295: return(0);
1296: } while (*p2++);
1297: return(1);
1298: }
1299:
1300: setcc(ap,type)
1301: char *ap;
1302: {
1303: register char *p, *p1;
1304:
1305: p = ap;
1306: if (!natural(p)) {
1307: ccloc[0] = 0;
1308: return;
1309: }
1310: p1 = ccloc;
1311: *p1++ = type;
1312: while (*p1++ = *p++);
1313: }
1314:
1315: okio(p) register char *p; {/* 0->probable I/O space address; 1->not */
1316: if (ioflag && (!natural(p) || 0>getnum(p))) return(0);
1317: return(1);
1318: }
1319:
1320: indexa(p) register char *p; {/* 1-> uses [r] addressing mode; 0->doesn't */
1321: while (*p) if (*p++=='[') return(1);
1322: return(0);
1323: }
1324:
1325: natural(p)
1326: register char *p;
1327: {/* 1->simple local, parameter, global, or register; 0->otherwise */
1328: if (*p=='*' || *p=='(' || *p=='-'&&*(p+1)=='(' || *p=='$'&&getnum(p+1))
1329: return(0);
1330: while (*p++);
1331: p--;
1332: if (*--p=='+' || *p==']' || *p==')' && *(p-2)!='a' && *(p-2)!='f')
1333: return(0);
1334: return(1);
1335: }
1336:
1337: /*
1338: ** Tell if an argument is most likely static.
1339: */
1340:
1341: isstatic(cp)
1342: register char *cp;
1343: {
1344: if (*cp == '_' || *cp == 'L' || (*cp++ == 'v' && *cp == '.'))
1345: return (1);
1346: return (0);
1347: }
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