1: /* Gforth support functions
2:
3: Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2006,2007,2008,2009 Free Software Foundation, Inc.
4:
5: This file is part of Gforth.
6:
7: Gforth is free software; you can redistribute it and/or
8: modify it under the terms of the GNU General Public License
9: as published by the Free Software Foundation, either version 3
10: of the License, or (at your option) any later version.
11:
12: This program is distributed in the hope that it will be useful,
13: but WITHOUT ANY WARRANTY; without even the implied warranty of
14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: GNU General Public License for more details.
16:
17: You should have received a copy of the GNU General Public License
18: along with this program; if not, see http://www.gnu.org/licenses/.
19: */
20:
21: #include "config.h"
22: #include "forth.h"
23: #include "io.h"
24: #include <stdlib.h>
25: #include <string.h>
26: #include <sys/time.h>
27: #include <unistd.h>
28: #include <pwd.h>
29: #include <assert.h>
30: #ifndef STANDALONE
31: #include <dirent.h>
32: #include <math.h>
33: #include <ctype.h>
34: #include <errno.h>
35: #include <sys/types.h>
36: #include <sys/stat.h>
37: #include <fcntl.h>
38: #include <time.h>
39: #endif
40: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
41: #include <dlfcn.h>
42: #endif
43:
44: #ifdef HAS_FILE
45: char *cstr(Char *from, UCell size, int clear)
46: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
47: the C-string lives until the next call of cstr with CLEAR being true */
48: {
49: static struct cstr_buffer {
50: char *buffer;
51: size_t size;
52: } *buffers=NULL;
53: static int nbuffers=0;
54: static int used=0;
55: struct cstr_buffer *b;
56:
57: if (buffers==NULL)
58: buffers=malloc(0);
59: if (clear)
60: used=0;
61: if (used>=nbuffers) {
62: buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
63: buffers[used]=(struct cstr_buffer){malloc(0),0};
64: nbuffers=used+1;
65: }
66: b=&buffers[used];
67: if (size+1 > b->size) {
68: b->buffer = realloc(b->buffer,size+1);
69: b->size = size+1;
70: }
71: memcpy(b->buffer,from,size);
72: b->buffer[size]='\0';
73: used++;
74: return b->buffer;
75: }
76:
77: char *tilde_cstr(Char *from, UCell size, int clear)
78: /* like cstr(), but perform tilde expansion on the string */
79: {
80: char *s1,*s2;
81: int s1_len, s2_len;
82: struct passwd *getpwnam (), *user_entry;
83:
84: if (size<1 || from[0]!='~')
85: return cstr(from, size, clear);
86: if (size<2 || from[1]=='/') {
87: s1 = (char *)getenv ("HOME");
88: if(s1 == NULL)
89: #if defined(_WIN32) || defined (MSDOS)
90: s1 = (char *)getenv ("TEMP");
91: if(s1 == NULL)
92: s1 = (char *)getenv ("TMP");
93: if(s1 == NULL)
94: #endif
95: s1 = "";
96: s2 = (char *)from+1;
97: s2_len = size-1;
98: } else {
99: UCell i;
100: for (i=1; i<size && from[i]!='/'; i++)
101: ;
102: if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
103: return cstr(from+3, size<3?0:size-3,clear);
104: {
105: char user[i];
106: memcpy(user,from+1,i-1);
107: user[i-1]='\0';
108: user_entry=getpwnam(user);
109: }
110: if (user_entry==NULL)
111: return cstr(from, size, clear);
112: s1 = user_entry->pw_dir;
113: s2 = (char *)from+i;
114: s2_len = size-i;
115: }
116: s1_len = strlen(s1);
117: if (s1_len>1 && s1[s1_len-1]=='/')
118: s1_len--;
119: {
120: char path[s1_len+s2_len];
121: memcpy(path,s1,s1_len);
122: memcpy(path+s1_len,s2,s2_len);
123: return cstr((Char *)path,s1_len+s2_len,clear);
124: }
125: }
126:
127: Cell opencreate_file(char *s, Cell wfam, int flags, Cell *wiorp)
128: {
129: Cell fd;
130: Cell wfileid;
131: fd = open(s, flags|ufileattr[wfam], 0666);
132: if (fd != -1) {
133: wfileid = (Cell)fdopen(fd, fileattr[wfam]);
134: *wiorp = IOR(wfileid == 0);
135: } else {
136: wfileid = 0;
137: *wiorp = IOR(1);
138: }
139: return wfileid;
140: }
141: #endif /* defined(HAS_FILE) */
142:
143: DCell timeval2us(struct timeval *tvp)
144: {
145: #ifndef BUGGY_LONG_LONG
146: return (tvp->tv_sec*(DCell)1000000)+tvp->tv_usec;
147: #else
148: DCell d2;
149: DCell d1=mmul(tvp->tv_sec,1000000);
150: d2.lo = d1.lo+tvp->tv_usec;
151: d2.hi = d1.hi + (d2.lo<d1.lo);
152: return d2;
153: #endif
154: }
155:
156: DCell double2ll(Float r)
157: {
158: #ifndef BUGGY_LONG_LONG
159: return (DCell)(r);
160: #else
161: double ldexp(double x, int exp);
162: DCell d;
163: if (r<0) {
164: d.hi = ldexp(-r,-(int)(CELL_BITS));
165: d.lo = (-r)-ldexp((Float)d.hi,CELL_BITS);
166: return dnegate(d);
167: }
168: d.hi = ldexp(r,-(int)(CELL_BITS));
169: d.lo = r-ldexp((Float)d.hi,CELL_BITS);
170: return d;
171: #endif
172: }
173:
174: void cmove(Char *c_from, Char *c_to, UCell u)
175: {
176: while (u-- > 0)
177: *c_to++ = *c_from++;
178: }
179:
180: void cmove_up(Char *c_from, Char *c_to, UCell u)
181: {
182: while (u-- > 0)
183: c_to[u] = c_from[u];
184: }
185:
186: Cell compare(Char *c_addr1, UCell u1, Char *c_addr2, UCell u2)
187: {
188: Cell n;
189:
190: n = memcmp(c_addr1, c_addr2, u1<u2 ? u1 : u2);
191: if (n==0)
192: n = u1-u2;
193: if (n<0)
194: n = -1;
195: else if (n>0)
196: n = 1;
197: return n;
198: }
199:
200: Cell memcasecmp(const Char *s1, const Char *s2, Cell n)
201: {
202: Cell i;
203:
204: for (i=0; i<n; i++) {
205: Char c1=toupper(s1[i]);
206: Char c2=toupper(s2[i]);
207: if (c1 != c2) {
208: if (c1 < c2)
209: return -1;
210: else
211: return 1;
212: }
213: }
214: return 0;
215: }
216:
217: Cell capscompare(Char *c_addr1, UCell u1, Char *c_addr2, UCell u2)
218: {
219: Cell n;
220:
221: n = memcasecmp(c_addr1, c_addr2, u1<u2 ? u1 : u2);
222: if (n==0)
223: n = u1-u2;
224: if (n<0)
225: n = -1;
226: else if (n>0)
227: n = 1;
228: return n;
229: }
230:
231: struct Longname *listlfind(Char *c_addr, UCell u, struct Longname *longname1)
232: {
233: for (; longname1 != NULL; longname1 = (struct Longname *)(longname1->next))
234: if ((UCell)LONGNAME_COUNT(longname1)==u &&
235: memcasecmp(c_addr, (Char *)(longname1->name), u)== 0 /* or inline? */)
236: break;
237: return longname1;
238: }
239:
240: struct Longname *hashlfind(Char *c_addr, UCell u, Cell *a_addr)
241: {
242: struct Longname *longname1;
243:
244: while(a_addr != NULL) {
245: longname1=(struct Longname *)(a_addr[1]);
246: a_addr=(Cell *)(a_addr[0]);
247: if ((UCell)LONGNAME_COUNT(longname1)==u &&
248: memcasecmp(c_addr, (Char *)(longname1->name), u)== 0 /* or inline? */) {
249: return longname1;
250: }
251: }
252: return NULL;
253: }
254:
255: struct Longname *tablelfind(Char *c_addr, UCell u, Cell *a_addr)
256: {
257: struct Longname *longname1;
258: while(a_addr != NULL) {
259: longname1=(struct Longname *)(a_addr[1]);
260: a_addr=(Cell *)(a_addr[0]);
261: if ((UCell)LONGNAME_COUNT(longname1)==u &&
262: memcmp(c_addr, longname1->name, u)== 0 /* or inline? */) {
263: return longname1;
264: }
265: }
266: return NULL;
267: }
268:
269: UCell hashkey1(Char *c_addr, UCell u, UCell ubits)
270: /* this hash function rotates the key at every step by rot bits within
271: ubits bits and xors it with the character. This function does ok in
272: the chi-sqare-test. Rot should be <=7 (preferably <=5) for
273: ASCII strings (larger if ubits is large), and should share no
274: divisors with ubits.
275: */
276: {
277: static char rot_values[] = {5,0,1,2,3,4,5,5,5,5,3,5,5,5,5,7,5,5,5,5,7,5,5,5,5,6,5,5,5,5,7,5,5};
278: unsigned rot = rot_values[ubits];
279: Char *cp = c_addr;
280: UCell ukey;
281:
282: for (ukey=0; cp<c_addr+u; cp++)
283: ukey = ((((ukey<<rot) | (ukey>>(ubits-rot)))
284: ^ toupper(*cp))
285: & ((1<<ubits)-1));
286: return ukey;
287: }
288:
289: struct Cellpair parse_white(Char *c_addr1, UCell u1)
290: {
291: /* use !isgraph instead of isspace? */
292: struct Cellpair result;
293: Char *c_addr2;
294: Char *endp = c_addr1+u1;
295: while (c_addr1<endp && isspace(*c_addr1))
296: c_addr1++;
297: if (c_addr1<endp) {
298: for (c_addr2 = c_addr1; c_addr1<endp && !isspace(*c_addr1); c_addr1++)
299: ;
300: result.n1 = (Cell)c_addr2;
301: result.n2 = c_addr1-c_addr2;
302: } else {
303: result.n1 = (Cell)c_addr1;
304: result.n2 = 0;
305: }
306: return result;
307: }
308:
309: #ifdef HAS_FILE
310: Cell rename_file(Char *c_addr1, UCell u1, Char *c_addr2, UCell u2)
311: {
312: char *s1=tilde_cstr(c_addr2, u2, 1);
313: return IOR(rename(tilde_cstr(c_addr1, u1, 0), s1)==-1);
314: }
315:
316: struct Cellquad read_line(Char *c_addr, UCell u1, FILE *wfileid)
317: {
318: UCell u2, u3;
319: Cell flag, wior;
320: Cell c;
321: struct Cellquad r;
322:
323: flag=-1;
324: u3=0;
325: if (u1>0)
326: gf_regetc(wfileid);
327: for(u2=0; u2<u1; u2++) {
328: c = getc(wfileid);
329: u3++;
330: if (c=='\n') break;
331: if (c=='\r') {
332: if ((c = getc(wfileid))!='\n')
333: gf_ungetc(c,wfileid);
334: else
335: u3++;
336: break;
337: }
338: if (c==EOF) {
339: flag=FLAG(u2!=0);
340: break;
341: }
342: c_addr[u2] = (Char)c;
343: }
344: wior=FILEIO(ferror(wfileid));
345: r.n1 = u2;
346: r.n2 = flag;
347: r.n3 = u3;
348: r.n4 = wior;
349: return r;
350: }
351:
352: struct Cellpair file_status(Char *c_addr, UCell u)
353: {
354: struct Cellpair r;
355: Cell wfam;
356: Cell wior;
357: char *filename=tilde_cstr(c_addr, u, 1);
358:
359: if (access (filename, F_OK) != 0) {
360: wfam=0;
361: wior=IOR(1);
362: }
363: else if (access (filename, R_OK | W_OK) == 0) {
364: wfam=2; /* r/w */
365: wior=0;
366: }
367: else if (access (filename, R_OK) == 0) {
368: wfam=0; /* r/o */
369: wior=0;
370: }
371: else if (access (filename, W_OK) == 0) {
372: wfam=4; /* w/o */
373: wior=0;
374: }
375: else {
376: wfam=1; /* well, we cannot access the file, but better deliver a
377: legal access mode (r/o bin), so we get a decent error
378: later upon open. */
379: wior=0;
380: }
381: r.n1 = wfam;
382: r.n2 = wior;
383: return r;
384: }
385:
386: Cell to_float(Char *c_addr, UCell u, Float *rp)
387: {
388: /* convertible string := <significand>[<exponent>]
389: <significand> := [<sign>]{<digits>[.<digits0>] | .<digits> }
390: <exponent> := <marker><digits0>
391: <marker> := {<e-form> | <sign-form>}
392: <e-form> := <e-char>[<sign-form>]
393: <sign-form> := { + | - }
394: <e-char> := { D | d | E | e }
395: */
396: Char *s = c_addr;
397: Char c;
398: Char *send = c_addr+u;
399: UCell ndigits = 0;
400: UCell ndots = 0;
401: UCell edigits = 0;
402: char cnum[u+3]; /* append at most "e0\0" */
403: char *t=cnum;
404: char *endconv;
405: Float r;
406:
407: if (s >= send) /* treat empty string as 0e */
408: goto return0;
409: switch ((c=*s)) {
410: case ' ':
411: /* "A string of blanks should be treated as a special case
412: representing zero."*/
413: for (s++; s<send; )
414: if (*s++ != ' ')
415: goto error;
416: goto return0;
417: case '-':
418: case '+': *t++ = c; s++; goto aftersign;
419: }
420: aftersign:
421: if (s >= send)
422: goto exponent;
423: switch (c=*s) {
424: case '0' ... '9': *t++ = c; ndigits++; s++; goto aftersign;
425: case '.': *t++ = c; ndots++; s++; goto aftersign;
426: default: goto exponent;
427: }
428: exponent:
429: if (ndigits < 1 || ndots > 1)
430: goto error;
431: *t++ = 'E';
432: if (s >= send)
433: goto done;
434: switch (c=*s) {
435: case 'D':
436: case 'd':
437: case 'E':
438: case 'e': s++; break;
439: }
440: if (s >= send)
441: goto done;
442: switch (c=*s) {
443: case '+':
444: case '-': *t++ = c; s++; break;
445: }
446: edigits0:
447: if (s >= send)
448: goto done;
449: switch (c=*s) {
450: case '0' ... '9': *t++ = c; s++; edigits++; goto edigits0;
451: default: goto error;
452: }
453: done:
454: if (edigits == 0)
455: *t++ = '0';
456: *t++ = '\0';
457: assert(t-cnum <= u+3);
458: r = strtod(cnum, &endconv);
459: assert(*endconv == '\0');
460: *rp = r;
461: return -1;
462: return0:
463: *rp = 0.0;
464: return -1;
465: error:
466: *rp = 0.0;
467: return 0;
468: }
469: #endif
470:
471: #ifdef HAS_FLOATING
472: Float v_star(Float *f_addr1, Cell nstride1, Float *f_addr2, Cell nstride2, UCell ucount)
473: {
474: Float r;
475:
476: for (r=0.; ucount>0; ucount--) {
477: r += *f_addr1 * *f_addr2;
478: f_addr1 = (Float *)(((Address)f_addr1)+nstride1);
479: f_addr2 = (Float *)(((Address)f_addr2)+nstride2);
480: }
481: return r;
482: }
483:
484: void faxpy(Float ra, Float *f_x, Cell nstridex, Float *f_y, Cell nstridey, UCell ucount)
485: {
486: for (; ucount>0; ucount--) {
487: *f_y += ra * *f_x;
488: f_x = (Float *)(((Address)f_x)+nstridex);
489: f_y = (Float *)(((Address)f_y)+nstridey);
490: }
491: }
492: #endif
493:
494: UCell lshift(UCell u1, UCell n)
495: {
496: return u1 << n;
497: }
498:
499: UCell rshift(UCell u1, UCell n)
500: {
501: return u1 >> n;
502: }
503:
504: #ifndef STANDALONE
505: int gforth_system(Char *c_addr, UCell u)
506: {
507: int retval;
508: char *prefix = getenv("GFORTHSYSTEMPREFIX") ? : DEFAULTSYSTEMPREFIX;
509: size_t prefixlen = strlen(prefix);
510: char buffer[prefixlen+u+1];
511: fflush(stdout);
512: #ifndef MSDOS
513: int old_tp=terminal_prepped;
514: deprep_terminal();
515: #endif
516: memcpy(buffer,prefix,prefixlen);
517: memcpy(buffer+prefixlen,c_addr,u);
518: buffer[prefixlen+u]='\0';
519: retval=system(buffer); /* ~ expansion on first part of string? */
520: #ifndef MSDOS
521: if (old_tp)
522: prep_terminal();
523: #endif
524: return retval;
525: }
526:
527: void gforth_ms(UCell u)
528: {
529: #ifdef HAVE_NANOSLEEP
530: struct timespec time_req;
531: time_req.tv_sec=u/1000;
532: time_req.tv_nsec=1000000*(u%1000);
533: while(nanosleep(&time_req, &time_req));
534: #else /* !defined(HAVE_NANOSLEEP) */
535: struct timeval timeout;
536: timeout.tv_sec=u/1000;
537: timeout.tv_usec=1000*(u%1000);
538: (void)select(0,0,0,0,&timeout);
539: #endif /* !defined(HAVE_NANOSLEEP) */
540: }
541:
542: UCell gforth_dlopen(Char *c_addr, UCell u)
543: {
544: char * file=tilde_cstr(c_addr, u, 1);
545: UCell lib;
546: #if defined(HAVE_LIBLTDL)
547: lib = (UCell)lt_dlopen(file);
548: if(lib) return lib;
549: #elif defined(HAVE_LIBDL) || defined(HAVE_DLOPEN)
550: #ifndef RTLD_GLOBAL
551: #define RTLD_GLOBAL 0
552: #endif
553: lib = (UCell)dlopen(file, RTLD_GLOBAL | RTLD_LAZY);
554: if(lib) return lib;
555: #elif defined(_WIN32)
556: lib = (UCell) GetModuleHandle(file);
557: if(lib) return lib;
558: #endif
559: return 0;
560: }
561:
562: #endif /* !defined(STANDALONE) */
563:
564:
565: /* mixed division support; should usually be faster than gcc's
566: double-by-double division (and gcc typically does not generate
567: double-by-single division because of exception handling issues. If
568: the architecture has double-by-single division, you should define
569: ASM_SM_SLASH_REM and ASM_UM_SLASH_MOD appropriately. */
570:
571: /* Type definitions for longlong.h (according to the comments at the start):
572: declarations taken from libgcc2.h */
573:
574: typedef unsigned int UQItype __attribute__ ((mode (QI)));
575: typedef int SItype __attribute__ ((mode (SI)));
576: typedef unsigned int USItype __attribute__ ((mode (SI)));
577: typedef int DItype __attribute__ ((mode (DI)));
578: typedef unsigned int UDItype __attribute__ ((mode (DI)));
579: typedef UCell UWtype;
580: #if (SIZEOF_CHAR_P == 4)
581: typedef unsigned int UHWtype __attribute__ ((mode (HI)));
582: #endif
583: #if (SIZEOF_CHAR_P == 8)
584: typedef USItype UHWtype;
585: #endif
586: #ifndef BUGGY_LONG_LONG
587: typedef UDCell UDWtype;
588: #endif
589: #define W_TYPE_SIZE (SIZEOF_CHAR_P * 8)
590:
591: #include "longlong.h"
592:
593:
594: #if defined(udiv_qrnnd) && !defined(__alpha) && UDIV_NEEDS_NORMALIZATION
595:
596: #if defined(count_leading_zeros)
597: const UQItype __clz_tab[256] =
598: {
599: 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
600: 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
601: 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
602: 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
603: 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
604: 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
605: 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
606: 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
607: };
608: #endif
609:
610: static Cell MAYBE_UNUSED nlz(UCell x)
611: /* number of leading zeros, adapted from "Hacker's Delight" */
612: {
613: Cell n;
614:
615: #if !defined(COUNT_LEADING_ZEROS_0)
616: if (x == 0) return(CELL_BITS);
617: #endif
618: #if defined(count_leading_zeros)
619: count_leading_zeros(n,x);
620: #else
621: n = 0;
622: #if (SIZEOF_CHAR_P > 4)
623: if (x <= 0xffffffff)
624: n+=32;
625: else
626: x >>= 32;
627: #endif
628: if (x <= 0x0000FFFF) {n = n +16; x = x <<16;}
629: if (x <= 0x00FFFFFF) {n = n + 8; x = x << 8;}
630: if (x <= 0x0FFFFFFF) {n = n + 4; x = x << 4;}
631: if (x <= 0x3FFFFFFF) {n = n + 2; x = x << 2;}
632: if (x <= 0x7FFFFFFF) {n = n + 1;}
633: #endif
634: return n;
635: }
636: #endif /*defined(udiv_qrnnd) && !defined(__alpha) && UDIV_NEEDS_NORMALIZATION*/
637:
638: #if !defined(ASM_UM_SLASH_MOD)
639: UDCell umdiv (UDCell u, UCell v)
640: /* Divide unsigned double by single precision using shifts and subtracts.
641: Return quotient in lo, remainder in hi. */
642: {
643: UDCell res;
644: #if defined(udiv_qrnnd) && !defined(__alpha)
645: #if 0
646: This code is slower on an Alpha (timings with gcc-3.3.5):
647: other this
648: */ 5205 ms 5741 ms
649: */mod 5167 ms 5717 ms
650: fm/mod 5467 ms 5312 ms
651: sm/rem 4734 ms 5278 ms
652: um/mod 4490 ms 5020 ms
653: m*/ 15557 ms 17151 ms
654: #endif /* 0 */
655: UCell q,r,u0,u1;
656: UCell MAYBE_UNUSED lz;
657:
658: vm_ud2twoCell(u,u0,u1);
659: if (v==0)
660: throw(BALL_DIVZERO);
661: if (u1>=v)
662: throw(BALL_RESULTRANGE);
663: #if UDIV_NEEDS_NORMALIZATION
664: lz = nlz(v);
665: v <<= lz;
666: u = UDLSHIFT(u,lz);
667: vm_ud2twoCell(u,u0,u1);
668: #endif
669: udiv_qrnnd(q,r,u1,u0,v);
670: #if UDIV_NEEDS_NORMALIZATION
671: r >>= lz;
672: #endif
673: vm_twoCell2ud(q,r,res);
674: #else /* !(defined(udiv_qrnnd) && !defined(__alpha)) */
675: /* simple restoring subtract-and-shift algorithm, might be faster on Alpha */
676: int i = CELL_BITS, c = 0;
677: UCell q = 0;
678: UCell h, l;
679:
680: vm_ud2twoCell(u,l,h);
681: if (v==0)
682: throw(BALL_DIVZERO);
683: if (h>=v)
684: throw(BALL_RESULTRANGE);
685: for (;;)
686: {
687: if (c || h >= v)
688: {
689: q++;
690: h -= v;
691: }
692: if (--i < 0)
693: break;
694: c = HIGHBIT (h);
695: h <<= 1;
696: h += HIGHBIT (l);
697: l <<= 1;
698: q <<= 1;
699: }
700: vm_twoCell2ud(q,h,res);
701: #endif /* !(defined(udiv_qrnnd) && !defined(__alpha)) */
702: return res;
703: }
704: #endif
705:
706: #if !defined(ASM_SM_SLASH_REM)
707: #if defined(ASM_UM_SLASH_MOD)
708: /* define it if it is not defined above */
709: static UDCell MAYBE_UNUSED umdiv (UDCell u, UCell v)
710: {
711: UDCell res;
712: UCell u0,u1;
713: vm_ud2twoCell(u,u0,u1);
714: ASM_UM_SLASH_MOD(u0,u1,v,r,q);
715: vm_twoCell2ud(q,r,res);
716: return res;
717: }
718: #endif /* defined(ASM_UM_SLASH_MOD) */
719:
720: #ifndef BUGGY_LONG_LONG
721: #define dnegate(x) (-(x))
722: #endif
723:
724: DCell smdiv (DCell num, Cell denom)
725: /* symmetric divide procedure, mixed prec */
726: {
727: DCell res;
728: #if defined(sdiv_qrnnd)
729: /* #warning "using sdiv_qrnnd" */
730: Cell u1,q,r
731: UCell u0;
732: UCell MAYBE_UNUSED lz;
733:
734: vm_d2twoCell(u,u0,u1);
735: if (v==0)
736: throw(BALL_DIVZERO);
737: if (u1>=v)
738: throw(BALL_RESULTRANGE);
739: sdiv_qrnnd(q,r,u1,u0,v);
740: vm_twoCell2d(q,r,res);
741: #else
742: UDCell ures;
743: UCell l, q, r;
744: Cell h;
745: Cell denomsign=denom;
746:
747: vm_d2twoCell(num,l,h);
748: if (h < 0)
749: num = dnegate (num);
750: if (denomsign < 0)
751: denom = -denom;
752: ures = umdiv(D2UD(num), denom);
753: vm_ud2twoCell(ures,q,r);
754: if ((h^denomsign)<0) {
755: q = -q;
756: if (((Cell)q) > 0) /* note: == 0 is possible */
757: throw(BALL_RESULTRANGE);
758: } else {
759: if (((Cell)q) < 0)
760: throw(BALL_RESULTRANGE);
761: }
762: if (h<0)
763: r = -r;
764: vm_twoCell2d(q,r,res);
765: #endif
766: return res;
767: }
768:
769: DCell fmdiv (DCell num, Cell denom)
770: /* floored divide procedure, mixed prec */
771: {
772: /* I have this technique from Andrew Haley */
773: DCell res;
774: UDCell ures;
775: Cell denomsign=denom;
776: Cell numsign;
777: UCell q,r;
778:
779: if (denom < 0) {
780: denom = -denom;
781: num = dnegate(num);
782: }
783: numsign = DHI(num);
784: if (numsign < 0)
785: DHI_IS(num,DHI(num)+denom);
786: ures = umdiv(D2UD(num),denom);
787: vm_ud2twoCell(ures,q,r);
788: if ((numsign^((Cell)q)) < 0)
789: throw(BALL_RESULTRANGE);
790: if (denomsign<0)
791: r = -r;
792: vm_twoCell2d(q,r,res);
793: return res;
794: }
795: #endif
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