merge from gcc
[deliverable/binutils-gdb.git] / libdecnumber / dpd / decimal128.c
CommitLineData
f5bc1778
DJ
1/* Decimal 128-bit format module for the decNumber C Library.
2 Copyright (C) 2005, 2007 Free Software Foundation, Inc.
3 Contributed by IBM Corporation. Author Mike Cowlishaw.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
11
12 In addition to the permissions in the GNU General Public License,
13 the Free Software Foundation gives you unlimited permission to link
14 the compiled version of this file into combinations with other
15 programs, and to distribute those combinations without any
16 restriction coming from the use of this file. (The General Public
17 License restrictions do apply in other respects; for example, they
18 cover modification of the file, and distribution when not linked
19 into a combine executable.)
20
21 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
22 WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
24 for more details.
25
26 You should have received a copy of the GNU General Public License
27 along with GCC; see the file COPYING. If not, write to the Free
28 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
29 02110-1301, USA. */
30
31/* ------------------------------------------------------------------ */
32/* Decimal 128-bit format module */
33/* ------------------------------------------------------------------ */
34/* This module comprises the routines for decimal128 format numbers. */
35/* Conversions are supplied to and from decNumber and String. */
36/* */
37/* This is used when decNumber provides operations, either for all */
38/* operations or as a proxy between decNumber and decSingle. */
39/* */
40/* Error handling is the same as decNumber (qv.). */
41/* ------------------------------------------------------------------ */
42#include <string.h> /* [for memset/memcpy] */
43#include <stdio.h> /* [for printf] */
44
87d32bb7
DD
45#include "dconfig.h" /* GCC definitions */
46#define DECNUMDIGITS 34 /* make decNumbers with space for 34 */
f5bc1778
DJ
47#include "decNumber.h" /* base number library */
48#include "decNumberLocal.h" /* decNumber local types, etc. */
87d32bb7 49#include "decimal128.h" /* our primary include */
f5bc1778
DJ
50
51/* Utility routines and tables [in decimal64.c] */
f5bc1778
DJ
52extern const uInt COMBEXP[32], COMBMSD[32];
53extern const uShort DPD2BIN[1024];
54extern const uShort BIN2DPD[1000]; /* [not used] */
55extern const uByte BIN2CHAR[4001];
56
57extern void decDigitsFromDPD(decNumber *, const uInt *, Int);
58extern void decDigitsToDPD(const decNumber *, uInt *, Int);
59
60#if DECTRACE || DECCHECK
61void decimal128Show(const decimal128 *); /* for debug */
62extern void decNumberShow(const decNumber *); /* .. */
63#endif
64
65/* Useful macro */
66/* Clear a structure (e.g., a decNumber) */
67#define DEC_clear(d) memset(d, 0, sizeof(*d))
68
69/* ------------------------------------------------------------------ */
70/* decimal128FromNumber -- convert decNumber to decimal128 */
71/* */
72/* ds is the target decimal128 */
73/* dn is the source number (assumed valid) */
87d32bb7 74/* set is the context, used only for reporting errors */
f5bc1778
DJ
75/* */
76/* The set argument is used only for status reporting and for the */
77/* rounding mode (used if the coefficient is more than DECIMAL128_Pmax*/
78/* digits or an overflow is detected). If the exponent is out of the */
79/* valid range then Overflow or Underflow will be raised. */
80/* After Underflow a subnormal result is possible. */
81/* */
82/* DEC_Clamped is set if the number has to be 'folded down' to fit, */
83/* by reducing its exponent and multiplying the coefficient by a */
84/* power of ten, or if the exponent on a zero had to be clamped. */
85/* ------------------------------------------------------------------ */
86decimal128 * decimal128FromNumber(decimal128 *d128, const decNumber *dn,
87 decContext *set) {
88 uInt status=0; /* status accumulator */
89 Int ae; /* adjusted exponent */
90 decNumber dw; /* work */
91 decContext dc; /* .. */
f5bc1778 92 uInt comb, exp; /* .. */
87d32bb7 93 uInt uiwork; /* for macros */
f5bc1778
DJ
94 uInt targar[4]={0,0,0,0}; /* target 128-bit */
95 #define targhi targar[3] /* name the word with the sign */
96 #define targmh targar[2] /* name the words */
97 #define targml targar[1] /* .. */
98 #define targlo targar[0] /* .. */
99
100 /* If the number has too many digits, or the exponent could be */
101 /* out of range then reduce the number under the appropriate */
102 /* constraints. This could push the number to Infinity or zero, */
103 /* so this check and rounding must be done before generating the */
104 /* decimal128] */
87d32bb7 105 ae=dn->exponent+dn->digits-1; /* [0 if special] */
f5bc1778
DJ
106 if (dn->digits>DECIMAL128_Pmax /* too many digits */
107 || ae>DECIMAL128_Emax /* likely overflow */
108 || ae<DECIMAL128_Emin) { /* likely underflow */
109 decContextDefault(&dc, DEC_INIT_DECIMAL128); /* [no traps] */
110 dc.round=set->round; /* use supplied rounding */
111 decNumberPlus(&dw, dn, &dc); /* (round and check) */
112 /* [this changes -0 to 0, so enforce the sign...] */
113 dw.bits|=dn->bits&DECNEG;
114 status=dc.status; /* save status */
115 dn=&dw; /* use the work number */
116 } /* maybe out of range */
117
118 if (dn->bits&DECSPECIAL) { /* a special value */
119 if (dn->bits&DECINF) targhi=DECIMAL_Inf<<24;
120 else { /* sNaN or qNaN */
87d32bb7 121 if ((*dn->lsu!=0 || dn->digits>1) /* non-zero coefficient */
f5bc1778
DJ
122 && (dn->digits<DECIMAL128_Pmax)) { /* coefficient fits */
123 decDigitsToDPD(dn, targar, 0);
124 }
125 if (dn->bits&DECNAN) targhi|=DECIMAL_NaN<<24;
126 else targhi|=DECIMAL_sNaN<<24;
127 } /* a NaN */
128 } /* special */
129
130 else { /* is finite */
131 if (decNumberIsZero(dn)) { /* is a zero */
132 /* set and clamp exponent */
133 if (dn->exponent<-DECIMAL128_Bias) {
134 exp=0; /* low clamp */
135 status|=DEC_Clamped;
136 }
137 else {
138 exp=dn->exponent+DECIMAL128_Bias; /* bias exponent */
139 if (exp>DECIMAL128_Ehigh) { /* top clamp */
140 exp=DECIMAL128_Ehigh;
141 status|=DEC_Clamped;
142 }
143 }
144 comb=(exp>>9) & 0x18; /* msd=0, exp top 2 bits .. */
145 }
146 else { /* non-zero finite number */
87d32bb7 147 uInt msd; /* work */
f5bc1778
DJ
148 Int pad=0; /* coefficient pad digits */
149
150 /* the dn is known to fit, but it may need to be padded */
87d32bb7 151 exp=(uInt)(dn->exponent+DECIMAL128_Bias); /* bias exponent */
f5bc1778
DJ
152 if (exp>DECIMAL128_Ehigh) { /* fold-down case */
153 pad=exp-DECIMAL128_Ehigh;
154 exp=DECIMAL128_Ehigh; /* [to maximum] */
155 status|=DEC_Clamped;
156 }
157
158 /* [fastpath for common case is not a win, here] */
159 decDigitsToDPD(dn, targar, pad);
160 /* save and clear the top digit */
161 msd=targhi>>14;
162 targhi&=0x00003fff;
163
164 /* create the combination field */
165 if (msd>=8) comb=0x18 | ((exp>>11) & 0x06) | (msd & 0x01);
166 else comb=((exp>>9) & 0x18) | msd;
167 }
168 targhi|=comb<<26; /* add combination field .. */
169 targhi|=(exp&0xfff)<<14; /* .. and exponent continuation */
170 } /* finite */
171
172 if (dn->bits&DECNEG) targhi|=0x80000000; /* add sign bit */
173
174 /* now write to storage; this is endian */
f5bc1778 175 if (DECLITEND) {
87d32bb7
DD
176 /* lo -> hi */
177 UBFROMUI(d128->bytes, targlo);
178 UBFROMUI(d128->bytes+4, targml);
179 UBFROMUI(d128->bytes+8, targmh);
180 UBFROMUI(d128->bytes+12, targhi);
f5bc1778
DJ
181 }
182 else {
87d32bb7
DD
183 /* hi -> lo */
184 UBFROMUI(d128->bytes, targhi);
185 UBFROMUI(d128->bytes+4, targmh);
186 UBFROMUI(d128->bytes+8, targml);
187 UBFROMUI(d128->bytes+12, targlo);
f5bc1778
DJ
188 }
189
190 if (status!=0) decContextSetStatus(set, status); /* pass on status */
191 /* decimal128Show(d128); */
192 return d128;
193 } /* decimal128FromNumber */
194
195/* ------------------------------------------------------------------ */
196/* decimal128ToNumber -- convert decimal128 to decNumber */
197/* d128 is the source decimal128 */
198/* dn is the target number, with appropriate space */
199/* No error is possible. */
200/* ------------------------------------------------------------------ */
201decNumber * decimal128ToNumber(const decimal128 *d128, decNumber *dn) {
202 uInt msd; /* coefficient MSD */
203 uInt exp; /* exponent top two bits */
204 uInt comb; /* combination field */
87d32bb7
DD
205 Int need; /* work */
206 uInt uiwork; /* for macros */
f5bc1778
DJ
207 uInt sourar[4]; /* source 128-bit */
208 #define sourhi sourar[3] /* name the word with the sign */
209 #define sourmh sourar[2] /* and the mid-high word */
210 #define sourml sourar[1] /* and the mod-low word */
211 #define sourlo sourar[0] /* and the lowest word */
212
213 /* load source from storage; this is endian */
f5bc1778 214 if (DECLITEND) {
87d32bb7
DD
215 sourlo=UBTOUI(d128->bytes ); /* directly load the low int */
216 sourml=UBTOUI(d128->bytes+4 ); /* then the mid-low */
217 sourmh=UBTOUI(d128->bytes+8 ); /* then the mid-high */
218 sourhi=UBTOUI(d128->bytes+12); /* then the high int */
f5bc1778
DJ
219 }
220 else {
87d32bb7
DD
221 sourhi=UBTOUI(d128->bytes ); /* directly load the high int */
222 sourmh=UBTOUI(d128->bytes+4 ); /* then the mid-high */
223 sourml=UBTOUI(d128->bytes+8 ); /* then the mid-low */
224 sourlo=UBTOUI(d128->bytes+12); /* then the low int */
f5bc1778
DJ
225 }
226
227 comb=(sourhi>>26)&0x1f; /* combination field */
228
229 decNumberZero(dn); /* clean number */
230 if (sourhi&0x80000000) dn->bits=DECNEG; /* set sign if negative */
231
232 msd=COMBMSD[comb]; /* decode the combination field */
233 exp=COMBEXP[comb]; /* .. */
234
87d32bb7 235 if (exp==3) { /* is a special */
f5bc1778
DJ
236 if (msd==0) {
237 dn->bits|=DECINF;
238 return dn; /* no coefficient needed */
239 }
240 else if (sourhi&0x02000000) dn->bits|=DECSNAN;
241 else dn->bits|=DECNAN;
242 msd=0; /* no top digit */
243 }
244 else { /* is a finite number */
245 dn->exponent=(exp<<12)+((sourhi>>14)&0xfff)-DECIMAL128_Bias; /* unbiased */
246 }
247
248 /* get the coefficient */
249 sourhi&=0x00003fff; /* clean coefficient continuation */
250 if (msd) { /* non-zero msd */
251 sourhi|=msd<<14; /* prefix to coefficient */
252 need=12; /* process 12 declets */
253 }
254 else { /* msd=0 */
255 if (sourhi) need=11; /* declets to process */
256 else if (sourmh) need=10;
257 else if (sourml) need=7;
258 else if (sourlo) need=4;
259 else return dn; /* easy: coefficient is 0 */
260 } /*msd=0 */
261
262 decDigitsFromDPD(dn, sourar, need); /* process declets */
263 /* decNumberShow(dn); */
264 return dn;
265 } /* decimal128ToNumber */
266
267/* ------------------------------------------------------------------ */
87d32bb7 268/* to-scientific-string -- conversion to numeric string */
f5bc1778
DJ
269/* to-engineering-string -- conversion to numeric string */
270/* */
271/* decimal128ToString(d128, string); */
272/* decimal128ToEngString(d128, string); */
273/* */
274/* d128 is the decimal128 format number to convert */
275/* string is the string where the result will be laid out */
276/* */
277/* string must be at least 24 characters */
278/* */
279/* No error is possible, and no status can be set. */
280/* ------------------------------------------------------------------ */
281char * decimal128ToEngString(const decimal128 *d128, char *string){
87d32bb7 282 decNumber dn; /* work */
f5bc1778
DJ
283 decimal128ToNumber(d128, &dn);
284 decNumberToEngString(&dn, string);
285 return string;
286 } /* decimal128ToEngString */
287
288char * decimal128ToString(const decimal128 *d128, char *string){
289 uInt msd; /* coefficient MSD */
290 Int exp; /* exponent top two bits or full */
291 uInt comb; /* combination field */
87d32bb7 292 char *cstart; /* coefficient start */
f5bc1778 293 char *c; /* output pointer in string */
87d32bb7 294 const uByte *u; /* work */
f5bc1778
DJ
295 char *s, *t; /* .. (source, target) */
296 Int dpd; /* .. */
297 Int pre, e; /* .. */
87d32bb7 298 uInt uiwork; /* for macros */
f5bc1778
DJ
299
300 uInt sourar[4]; /* source 128-bit */
301 #define sourhi sourar[3] /* name the word with the sign */
302 #define sourmh sourar[2] /* and the mid-high word */
303 #define sourml sourar[1] /* and the mod-low word */
304 #define sourlo sourar[0] /* and the lowest word */
305
306 /* load source from storage; this is endian */
f5bc1778 307 if (DECLITEND) {
87d32bb7
DD
308 sourlo=UBTOUI(d128->bytes ); /* directly load the low int */
309 sourml=UBTOUI(d128->bytes+4 ); /* then the mid-low */
310 sourmh=UBTOUI(d128->bytes+8 ); /* then the mid-high */
311 sourhi=UBTOUI(d128->bytes+12); /* then the high int */
f5bc1778
DJ
312 }
313 else {
87d32bb7
DD
314 sourhi=UBTOUI(d128->bytes ); /* directly load the high int */
315 sourmh=UBTOUI(d128->bytes+4 ); /* then the mid-high */
316 sourml=UBTOUI(d128->bytes+8 ); /* then the mid-low */
317 sourlo=UBTOUI(d128->bytes+12); /* then the low int */
f5bc1778
DJ
318 }
319
320 c=string; /* where result will go */
321 if (((Int)sourhi)<0) *c++='-'; /* handle sign */
322
323 comb=(sourhi>>26)&0x1f; /* combination field */
324 msd=COMBMSD[comb]; /* decode the combination field */
325 exp=COMBEXP[comb]; /* .. */
326
327 if (exp==3) {
328 if (msd==0) { /* infinity */
87d32bb7 329 strcpy(c, "Inf");
f5bc1778
DJ
330 strcpy(c+3, "inity");
331 return string; /* easy */
332 }
333 if (sourhi&0x02000000) *c++='s'; /* sNaN */
334 strcpy(c, "NaN"); /* complete word */
335 c+=3; /* step past */
336 if (sourlo==0 && sourml==0 && sourmh==0
337 && (sourhi&0x0003ffff)==0) return string; /* zero payload */
338 /* otherwise drop through to add integer; set correct exp */
339 exp=0; msd=0; /* setup for following code */
340 }
341 else exp=(exp<<12)+((sourhi>>14)&0xfff)-DECIMAL128_Bias; /* unbiased */
342
343 /* convert 34 digits of significand to characters */
344 cstart=c; /* save start of coefficient */
345 if (msd) *c++='0'+(char)msd; /* non-zero most significant digit */
346
347 /* Now decode the declets. After extracting each one, it is */
348 /* decoded to binary and then to a 4-char sequence by table lookup; */
349 /* the 4-chars are a 1-char length (significant digits, except 000 */
350 /* has length 0). This allows us to left-align the first declet */
351 /* with non-zero content, then remaining ones are full 3-char */
352 /* length. We use fixed-length memcpys because variable-length */
353 /* causes a subroutine call in GCC. (These are length 4 for speed */
354 /* and are safe because the array has an extra terminator byte.) */
87d32bb7 355 #define dpd2char u=&BIN2CHAR[DPD2BIN[dpd]*4]; \
f5bc1778
DJ
356 if (c!=cstart) {memcpy(c, u+1, 4); c+=3;} \
357 else if (*u) {memcpy(c, u+4-*u, 4); c+=*u;}
358 dpd=(sourhi>>4)&0x3ff; /* declet 1 */
359 dpd2char;
87d32bb7 360 dpd=((sourhi&0xf)<<6) | (sourmh>>26); /* declet 2 */
f5bc1778
DJ
361 dpd2char;
362 dpd=(sourmh>>16)&0x3ff; /* declet 3 */
363 dpd2char;
364 dpd=(sourmh>>6)&0x3ff; /* declet 4 */
365 dpd2char;
366 dpd=((sourmh&0x3f)<<4) | (sourml>>28); /* declet 5 */
367 dpd2char;
368 dpd=(sourml>>18)&0x3ff; /* declet 6 */
369 dpd2char;
370 dpd=(sourml>>8)&0x3ff; /* declet 7 */
371 dpd2char;
372 dpd=((sourml&0xff)<<2) | (sourlo>>30); /* declet 8 */
373 dpd2char;
374 dpd=(sourlo>>20)&0x3ff; /* declet 9 */
375 dpd2char;
376 dpd=(sourlo>>10)&0x3ff; /* declet 10 */
377 dpd2char;
378 dpd=(sourlo)&0x3ff; /* declet 11 */
379 dpd2char;
380
381 if (c==cstart) *c++='0'; /* all zeros -- make 0 */
382
87d32bb7 383 if (exp==0) { /* integer or NaN case -- easy */
f5bc1778
DJ
384 *c='\0'; /* terminate */
385 return string;
386 }
387
388 /* non-0 exponent */
389 e=0; /* assume no E */
390 pre=c-cstart+exp;
391 /* [here, pre-exp is the digits count (==1 for zero)] */
392 if (exp>0 || pre<-5) { /* need exponential form */
393 e=pre-1; /* calculate E value */
394 pre=1; /* assume one digit before '.' */
395 } /* exponential form */
396
397 /* modify the coefficient, adding 0s, '.', and E+nn as needed */
398 s=c-1; /* source (LSD) */
399 if (pre>0) { /* ddd.ddd (plain), perhaps with E */
400 char *dotat=cstart+pre;
401 if (dotat<c) { /* if embedded dot needed... */
402 t=c; /* target */
403 for (; s>=dotat; s--, t--) *t=*s; /* open the gap; leave t at gap */
404 *t='.'; /* insert the dot */
405 c++; /* length increased by one */
406 }
407
408 /* finally add the E-part, if needed; it will never be 0, and has */
409 /* a maximum length of 4 digits */
410 if (e!=0) {
87d32bb7
DD
411 *c++='E'; /* starts with E */
412 *c++='+'; /* assume positive */
f5bc1778
DJ
413 if (e<0) {
414 *(c-1)='-'; /* oops, need '-' */
415 e=-e; /* uInt, please */
416 }
417 if (e<1000) { /* 3 (or fewer) digits case */
418 u=&BIN2CHAR[e*4]; /* -> length byte */
419 memcpy(c, u+4-*u, 4); /* copy fixed 4 characters [is safe] */
420 c+=*u; /* bump pointer appropriately */
421 }
422 else { /* 4-digits */
423 Int thou=((e>>3)*1049)>>17; /* e/1000 */
424 Int rem=e-(1000*thou); /* e%1000 */
425 *c++='0'+(char)thou;
426 u=&BIN2CHAR[rem*4]; /* -> length byte */
427 memcpy(c, u+1, 4); /* copy fixed 3+1 characters [is safe] */
428 c+=3; /* bump pointer, always 3 digits */
429 }
430 }
431 *c='\0'; /* add terminator */
432 /*printf("res %s\n", string); */
433 return string;
434 } /* pre>0 */
435
436 /* -5<=pre<=0: here for plain 0.ddd or 0.000ddd forms (can never have E) */
437 t=c+1-pre;
438 *(t+1)='\0'; /* can add terminator now */
439 for (; s>=cstart; s--, t--) *t=*s; /* shift whole coefficient right */
440 c=cstart;
441 *c++='0'; /* always starts with 0. */
442 *c++='.';
443 for (; pre<0; pre++) *c++='0'; /* add any 0's after '.' */
444 /*printf("res %s\n", string); */
445 return string;
446 } /* decimal128ToString */
447
448/* ------------------------------------------------------------------ */
449/* to-number -- conversion from numeric string */
450/* */
87d32bb7 451/* decimal128FromString(result, string, set); */
f5bc1778
DJ
452/* */
453/* result is the decimal128 format number which gets the result of */
454/* the conversion */
455/* *string is the character string which should contain a valid */
456/* number (which may be a special value) */
87d32bb7 457/* set is the context */
f5bc1778
DJ
458/* */
459/* The context is supplied to this routine is used for error handling */
460/* (setting of status and traps) and for the rounding mode, only. */
461/* If an error occurs, the result will be a valid decimal128 NaN. */
462/* ------------------------------------------------------------------ */
463decimal128 * decimal128FromString(decimal128 *result, const char *string,
464 decContext *set) {
465 decContext dc; /* work */
87d32bb7 466 decNumber dn; /* .. */
f5bc1778
DJ
467
468 decContextDefault(&dc, DEC_INIT_DECIMAL128); /* no traps, please */
469 dc.round=set->round; /* use supplied rounding */
470
471 decNumberFromString(&dn, string, &dc); /* will round if needed */
472 decimal128FromNumber(result, &dn, &dc);
473 if (dc.status!=0) { /* something happened */
474 decContextSetStatus(set, dc.status); /* .. pass it on */
475 }
476 return result;
477 } /* decimal128FromString */
478
479/* ------------------------------------------------------------------ */
480/* decimal128IsCanonical -- test whether encoding is canonical */
481/* d128 is the source decimal128 */
482/* returns 1 if the encoding of d128 is canonical, 0 otherwise */
483/* No error is possible. */
484/* ------------------------------------------------------------------ */
87d32bb7
DD
485uInt decimal128IsCanonical(const decimal128 *d128) {
486 decNumber dn; /* work */
f5bc1778
DJ
487 decimal128 canon; /* .. */
488 decContext dc; /* .. */
489 decContextDefault(&dc, DEC_INIT_DECIMAL128);
490 decimal128ToNumber(d128, &dn);
491 decimal128FromNumber(&canon, &dn, &dc);/* canon will now be canonical */
492 return memcmp(d128, &canon, DECIMAL128_Bytes)==0;
493 } /* decimal128IsCanonical */
494
495/* ------------------------------------------------------------------ */
496/* decimal128Canonical -- copy an encoding, ensuring it is canonical */
497/* d128 is the source decimal128 */
498/* result is the target (may be the same decimal128) */
499/* returns result */
500/* No error is possible. */
501/* ------------------------------------------------------------------ */
502decimal128 * decimal128Canonical(decimal128 *result, const decimal128 *d128) {
87d32bb7 503 decNumber dn; /* work */
f5bc1778
DJ
504 decContext dc; /* .. */
505 decContextDefault(&dc, DEC_INIT_DECIMAL128);
506 decimal128ToNumber(d128, &dn);
507 decimal128FromNumber(result, &dn, &dc);/* result will now be canonical */
508 return result;
509 } /* decimal128Canonical */
510
511#if DECTRACE || DECCHECK
512/* Macros for accessing decimal128 fields. These assume the argument
513 is a reference (pointer) to the decimal128 structure, and the
514 decimal128 is in network byte order (big-endian) */
515/* Get sign */
516#define decimal128Sign(d) ((unsigned)(d)->bytes[0]>>7)
517
518/* Get combination field */
519#define decimal128Comb(d) (((d)->bytes[0] & 0x7c)>>2)
520
521/* Get exponent continuation [does not remove bias] */
522#define decimal128ExpCon(d) ((((d)->bytes[0] & 0x03)<<10) \
523 | ((unsigned)(d)->bytes[1]<<2) \
524 | ((unsigned)(d)->bytes[2]>>6))
525
526/* Set sign [this assumes sign previously 0] */
527#define decimal128SetSign(d, b) { \
528 (d)->bytes[0]|=((unsigned)(b)<<7);}
529
530/* Set exponent continuation [does not apply bias] */
531/* This assumes range has been checked and exponent previously 0; */
532/* type of exponent must be unsigned */
533#define decimal128SetExpCon(d, e) { \
87d32bb7
DD
534 (d)->bytes[0]|=(uByte)((e)>>10); \
535 (d)->bytes[1] =(uByte)(((e)&0x3fc)>>2); \
536 (d)->bytes[2]|=(uByte)(((e)&0x03)<<6);}
f5bc1778
DJ
537
538/* ------------------------------------------------------------------ */
539/* decimal128Show -- display a decimal128 in hexadecimal [debug aid] */
87d32bb7 540/* d128 -- the number to show */
f5bc1778
DJ
541/* ------------------------------------------------------------------ */
542/* Also shows sign/cob/expconfields extracted */
543void decimal128Show(const decimal128 *d128) {
544 char buf[DECIMAL128_Bytes*2+1];
545 Int i, j=0;
546
547 if (DECLITEND) {
548 for (i=0; i<DECIMAL128_Bytes; i++, j+=2) {
549 sprintf(&buf[j], "%02x", d128->bytes[15-i]);
550 }
551 printf(" D128> %s [S:%d Cb:%02x Ec:%02x] LittleEndian\n", buf,
552 d128->bytes[15]>>7, (d128->bytes[15]>>2)&0x1f,
553 ((d128->bytes[15]&0x3)<<10)|(d128->bytes[14]<<2)|
554 (d128->bytes[13]>>6));
555 }
556 else {
557 for (i=0; i<DECIMAL128_Bytes; i++, j+=2) {
558 sprintf(&buf[j], "%02x", d128->bytes[i]);
559 }
560 printf(" D128> %s [S:%d Cb:%02x Ec:%02x] BigEndian\n", buf,
561 decimal128Sign(d128), decimal128Comb(d128),
562 decimal128ExpCon(d128));
563 }
564 } /* decimal128Show */
565#endif
This page took 0.093468 seconds and 4 git commands to generate.