| 1 | /* Decimal 32-bit format module for the decNumber C Library. |
| 2 | Copyright (C) 2005-2013 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 3, or (at your option) any later |
| 10 | version. |
| 11 | |
| 12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| 13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 15 | for more details. |
| 16 | |
| 17 | Under Section 7 of GPL version 3, you are granted additional |
| 18 | permissions described in the GCC Runtime Library Exception, version |
| 19 | 3.1, as published by the Free Software Foundation. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License and |
| 22 | a copy of the GCC Runtime Library Exception along with this program; |
| 23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 24 | <http://www.gnu.org/licenses/>. */ |
| 25 | |
| 26 | /* ------------------------------------------------------------------ */ |
| 27 | /* Decimal 32-bit format module */ |
| 28 | /* ------------------------------------------------------------------ */ |
| 29 | /* This module comprises the routines for decimal32 format numbers. */ |
| 30 | /* Conversions are supplied to and from decNumber and String. */ |
| 31 | /* */ |
| 32 | /* This is used when decNumber provides operations, either for all */ |
| 33 | /* operations or as a proxy between decNumber and decSingle. */ |
| 34 | /* */ |
| 35 | /* Error handling is the same as decNumber (qv.). */ |
| 36 | /* ------------------------------------------------------------------ */ |
| 37 | #include <string.h> /* [for memset/memcpy] */ |
| 38 | #include <stdio.h> /* [for printf] */ |
| 39 | |
| 40 | #include "dconfig.h" /* GCC definitions */ |
| 41 | #define DECNUMDIGITS 7 /* make decNumbers with space for 7 */ |
| 42 | #include "decNumber.h" /* base number library */ |
| 43 | #include "decNumberLocal.h" /* decNumber local types, etc. */ |
| 44 | #include "decimal32.h" /* our primary include */ |
| 45 | |
| 46 | /* Utility tables and routines [in decimal64.c] */ |
| 47 | extern const uInt COMBEXP[32], COMBMSD[32]; |
| 48 | extern const uShort DPD2BIN[1024]; |
| 49 | extern const uShort BIN2DPD[1000]; |
| 50 | extern const uByte BIN2CHAR[4001]; |
| 51 | |
| 52 | extern void decDigitsToDPD(const decNumber *, uInt *, Int); |
| 53 | extern void decDigitsFromDPD(decNumber *, const uInt *, Int); |
| 54 | |
| 55 | #if DECTRACE || DECCHECK |
| 56 | void decimal32Show(const decimal32 *); /* for debug */ |
| 57 | extern void decNumberShow(const decNumber *); /* .. */ |
| 58 | #endif |
| 59 | |
| 60 | /* Useful macro */ |
| 61 | /* Clear a structure (e.g., a decNumber) */ |
| 62 | #define DEC_clear(d) memset(d, 0, sizeof(*d)) |
| 63 | |
| 64 | /* ------------------------------------------------------------------ */ |
| 65 | /* decimal32FromNumber -- convert decNumber to decimal32 */ |
| 66 | /* */ |
| 67 | /* ds is the target decimal32 */ |
| 68 | /* dn is the source number (assumed valid) */ |
| 69 | /* set is the context, used only for reporting errors */ |
| 70 | /* */ |
| 71 | /* The set argument is used only for status reporting and for the */ |
| 72 | /* rounding mode (used if the coefficient is more than DECIMAL32_Pmax */ |
| 73 | /* digits or an overflow is detected). If the exponent is out of the */ |
| 74 | /* valid range then Overflow or Underflow will be raised. */ |
| 75 | /* After Underflow a subnormal result is possible. */ |
| 76 | /* */ |
| 77 | /* DEC_Clamped is set if the number has to be 'folded down' to fit, */ |
| 78 | /* by reducing its exponent and multiplying the coefficient by a */ |
| 79 | /* power of ten, or if the exponent on a zero had to be clamped. */ |
| 80 | /* ------------------------------------------------------------------ */ |
| 81 | decimal32 * decimal32FromNumber(decimal32 *d32, const decNumber *dn, |
| 82 | decContext *set) { |
| 83 | uInt status=0; /* status accumulator */ |
| 84 | Int ae; /* adjusted exponent */ |
| 85 | decNumber dw; /* work */ |
| 86 | decContext dc; /* .. */ |
| 87 | uInt comb, exp; /* .. */ |
| 88 | uInt uiwork; /* for macros */ |
| 89 | uInt targ=0; /* target 32-bit */ |
| 90 | |
| 91 | /* If the number has too many digits, or the exponent could be */ |
| 92 | /* out of range then reduce the number under the appropriate */ |
| 93 | /* constraints. This could push the number to Infinity or zero, */ |
| 94 | /* so this check and rounding must be done before generating the */ |
| 95 | /* decimal32] */ |
| 96 | ae=dn->exponent+dn->digits-1; /* [0 if special] */ |
| 97 | if (dn->digits>DECIMAL32_Pmax /* too many digits */ |
| 98 | || ae>DECIMAL32_Emax /* likely overflow */ |
| 99 | || ae<DECIMAL32_Emin) { /* likely underflow */ |
| 100 | decContextDefault(&dc, DEC_INIT_DECIMAL32); /* [no traps] */ |
| 101 | dc.round=set->round; /* use supplied rounding */ |
| 102 | decNumberPlus(&dw, dn, &dc); /* (round and check) */ |
| 103 | /* [this changes -0 to 0, so enforce the sign...] */ |
| 104 | dw.bits|=dn->bits&DECNEG; |
| 105 | status=dc.status; /* save status */ |
| 106 | dn=&dw; /* use the work number */ |
| 107 | } /* maybe out of range */ |
| 108 | |
| 109 | if (dn->bits&DECSPECIAL) { /* a special value */ |
| 110 | if (dn->bits&DECINF) targ=DECIMAL_Inf<<24; |
| 111 | else { /* sNaN or qNaN */ |
| 112 | if ((*dn->lsu!=0 || dn->digits>1) /* non-zero coefficient */ |
| 113 | && (dn->digits<DECIMAL32_Pmax)) { /* coefficient fits */ |
| 114 | decDigitsToDPD(dn, &targ, 0); |
| 115 | } |
| 116 | if (dn->bits&DECNAN) targ|=DECIMAL_NaN<<24; |
| 117 | else targ|=DECIMAL_sNaN<<24; |
| 118 | } /* a NaN */ |
| 119 | } /* special */ |
| 120 | |
| 121 | else { /* is finite */ |
| 122 | if (decNumberIsZero(dn)) { /* is a zero */ |
| 123 | /* set and clamp exponent */ |
| 124 | if (dn->exponent<-DECIMAL32_Bias) { |
| 125 | exp=0; /* low clamp */ |
| 126 | status|=DEC_Clamped; |
| 127 | } |
| 128 | else { |
| 129 | exp=dn->exponent+DECIMAL32_Bias; /* bias exponent */ |
| 130 | if (exp>DECIMAL32_Ehigh) { /* top clamp */ |
| 131 | exp=DECIMAL32_Ehigh; |
| 132 | status|=DEC_Clamped; |
| 133 | } |
| 134 | } |
| 135 | comb=(exp>>3) & 0x18; /* msd=0, exp top 2 bits .. */ |
| 136 | } |
| 137 | else { /* non-zero finite number */ |
| 138 | uInt msd; /* work */ |
| 139 | Int pad=0; /* coefficient pad digits */ |
| 140 | |
| 141 | /* the dn is known to fit, but it may need to be padded */ |
| 142 | exp=(uInt)(dn->exponent+DECIMAL32_Bias); /* bias exponent */ |
| 143 | if (exp>DECIMAL32_Ehigh) { /* fold-down case */ |
| 144 | pad=exp-DECIMAL32_Ehigh; |
| 145 | exp=DECIMAL32_Ehigh; /* [to maximum] */ |
| 146 | status|=DEC_Clamped; |
| 147 | } |
| 148 | |
| 149 | /* fastpath common case */ |
| 150 | if (DECDPUN==3 && pad==0) { |
| 151 | targ=BIN2DPD[dn->lsu[0]]; |
| 152 | if (dn->digits>3) targ|=(uInt)(BIN2DPD[dn->lsu[1]])<<10; |
| 153 | msd=(dn->digits==7 ? dn->lsu[2] : 0); |
| 154 | } |
| 155 | else { /* general case */ |
| 156 | decDigitsToDPD(dn, &targ, pad); |
| 157 | /* save and clear the top digit */ |
| 158 | msd=targ>>20; |
| 159 | targ&=0x000fffff; |
| 160 | } |
| 161 | |
| 162 | /* create the combination field */ |
| 163 | if (msd>=8) comb=0x18 | ((exp>>5) & 0x06) | (msd & 0x01); |
| 164 | else comb=((exp>>3) & 0x18) | msd; |
| 165 | } |
| 166 | targ|=comb<<26; /* add combination field .. */ |
| 167 | targ|=(exp&0x3f)<<20; /* .. and exponent continuation */ |
| 168 | } /* finite */ |
| 169 | |
| 170 | if (dn->bits&DECNEG) targ|=0x80000000; /* add sign bit */ |
| 171 | |
| 172 | /* now write to storage; this is endian */ |
| 173 | UBFROMUI(d32->bytes, targ); /* directly store the int */ |
| 174 | |
| 175 | if (status!=0) decContextSetStatus(set, status); /* pass on status */ |
| 176 | /* decimal32Show(d32); */ |
| 177 | return d32; |
| 178 | } /* decimal32FromNumber */ |
| 179 | |
| 180 | /* ------------------------------------------------------------------ */ |
| 181 | /* decimal32ToNumber -- convert decimal32 to decNumber */ |
| 182 | /* d32 is the source decimal32 */ |
| 183 | /* dn is the target number, with appropriate space */ |
| 184 | /* No error is possible. */ |
| 185 | /* ------------------------------------------------------------------ */ |
| 186 | decNumber * decimal32ToNumber(const decimal32 *d32, decNumber *dn) { |
| 187 | uInt msd; /* coefficient MSD */ |
| 188 | uInt exp; /* exponent top two bits */ |
| 189 | uInt comb; /* combination field */ |
| 190 | uInt sour; /* source 32-bit */ |
| 191 | uInt uiwork; /* for macros */ |
| 192 | |
| 193 | /* load source from storage; this is endian */ |
| 194 | sour=UBTOUI(d32->bytes); /* directly load the int */ |
| 195 | |
| 196 | comb=(sour>>26)&0x1f; /* combination field */ |
| 197 | |
| 198 | decNumberZero(dn); /* clean number */ |
| 199 | if (sour&0x80000000) dn->bits=DECNEG; /* set sign if negative */ |
| 200 | |
| 201 | msd=COMBMSD[comb]; /* decode the combination field */ |
| 202 | exp=COMBEXP[comb]; /* .. */ |
| 203 | |
| 204 | if (exp==3) { /* is a special */ |
| 205 | if (msd==0) { |
| 206 | dn->bits|=DECINF; |
| 207 | return dn; /* no coefficient needed */ |
| 208 | } |
| 209 | else if (sour&0x02000000) dn->bits|=DECSNAN; |
| 210 | else dn->bits|=DECNAN; |
| 211 | msd=0; /* no top digit */ |
| 212 | } |
| 213 | else { /* is a finite number */ |
| 214 | dn->exponent=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */ |
| 215 | } |
| 216 | |
| 217 | /* get the coefficient */ |
| 218 | sour&=0x000fffff; /* clean coefficient continuation */ |
| 219 | if (msd) { /* non-zero msd */ |
| 220 | sour|=msd<<20; /* prefix to coefficient */ |
| 221 | decDigitsFromDPD(dn, &sour, 3); /* process 3 declets */ |
| 222 | return dn; |
| 223 | } |
| 224 | /* msd=0 */ |
| 225 | if (!sour) return dn; /* easy: coefficient is 0 */ |
| 226 | if (sour&0x000ffc00) /* need 2 declets? */ |
| 227 | decDigitsFromDPD(dn, &sour, 2); /* process 2 declets */ |
| 228 | else |
| 229 | decDigitsFromDPD(dn, &sour, 1); /* process 1 declet */ |
| 230 | return dn; |
| 231 | } /* decimal32ToNumber */ |
| 232 | |
| 233 | /* ------------------------------------------------------------------ */ |
| 234 | /* to-scientific-string -- conversion to numeric string */ |
| 235 | /* to-engineering-string -- conversion to numeric string */ |
| 236 | /* */ |
| 237 | /* decimal32ToString(d32, string); */ |
| 238 | /* decimal32ToEngString(d32, string); */ |
| 239 | /* */ |
| 240 | /* d32 is the decimal32 format number to convert */ |
| 241 | /* string is the string where the result will be laid out */ |
| 242 | /* */ |
| 243 | /* string must be at least 24 characters */ |
| 244 | /* */ |
| 245 | /* No error is possible, and no status can be set. */ |
| 246 | /* ------------------------------------------------------------------ */ |
| 247 | char * decimal32ToEngString(const decimal32 *d32, char *string){ |
| 248 | decNumber dn; /* work */ |
| 249 | decimal32ToNumber(d32, &dn); |
| 250 | decNumberToEngString(&dn, string); |
| 251 | return string; |
| 252 | } /* decimal32ToEngString */ |
| 253 | |
| 254 | char * decimal32ToString(const decimal32 *d32, char *string){ |
| 255 | uInt msd; /* coefficient MSD */ |
| 256 | Int exp; /* exponent top two bits or full */ |
| 257 | uInt comb; /* combination field */ |
| 258 | char *cstart; /* coefficient start */ |
| 259 | char *c; /* output pointer in string */ |
| 260 | const uByte *u; /* work */ |
| 261 | char *s, *t; /* .. (source, target) */ |
| 262 | Int dpd; /* .. */ |
| 263 | Int pre, e; /* .. */ |
| 264 | uInt uiwork; /* for macros */ |
| 265 | uInt sour; /* source 32-bit */ |
| 266 | |
| 267 | /* load source from storage; this is endian */ |
| 268 | sour=UBTOUI(d32->bytes); /* directly load the int */ |
| 269 | |
| 270 | c=string; /* where result will go */ |
| 271 | if (((Int)sour)<0) *c++='-'; /* handle sign */ |
| 272 | |
| 273 | comb=(sour>>26)&0x1f; /* combination field */ |
| 274 | msd=COMBMSD[comb]; /* decode the combination field */ |
| 275 | exp=COMBEXP[comb]; /* .. */ |
| 276 | |
| 277 | if (exp==3) { |
| 278 | if (msd==0) { /* infinity */ |
| 279 | strcpy(c, "Inf"); |
| 280 | strcpy(c+3, "inity"); |
| 281 | return string; /* easy */ |
| 282 | } |
| 283 | if (sour&0x02000000) *c++='s'; /* sNaN */ |
| 284 | strcpy(c, "NaN"); /* complete word */ |
| 285 | c+=3; /* step past */ |
| 286 | if ((sour&0x000fffff)==0) return string; /* zero payload */ |
| 287 | /* otherwise drop through to add integer; set correct exp */ |
| 288 | exp=0; msd=0; /* setup for following code */ |
| 289 | } |
| 290 | else exp=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */ |
| 291 | |
| 292 | /* convert 7 digits of significand to characters */ |
| 293 | cstart=c; /* save start of coefficient */ |
| 294 | if (msd) *c++='0'+(char)msd; /* non-zero most significant digit */ |
| 295 | |
| 296 | /* Now decode the declets. After extracting each one, it is */ |
| 297 | /* decoded to binary and then to a 4-char sequence by table lookup; */ |
| 298 | /* the 4-chars are a 1-char length (significant digits, except 000 */ |
| 299 | /* has length 0). This allows us to left-align the first declet */ |
| 300 | /* with non-zero content, then remaining ones are full 3-char */ |
| 301 | /* length. We use fixed-length memcpys because variable-length */ |
| 302 | /* causes a subroutine call in GCC. (These are length 4 for speed */ |
| 303 | /* and are safe because the array has an extra terminator byte.) */ |
| 304 | #define dpd2char u=&BIN2CHAR[DPD2BIN[dpd]*4]; \ |
| 305 | if (c!=cstart) {memcpy(c, u+1, 4); c+=3;} \ |
| 306 | else if (*u) {memcpy(c, u+4-*u, 4); c+=*u;} |
| 307 | |
| 308 | dpd=(sour>>10)&0x3ff; /* declet 1 */ |
| 309 | dpd2char; |
| 310 | dpd=(sour)&0x3ff; /* declet 2 */ |
| 311 | dpd2char; |
| 312 | |
| 313 | if (c==cstart) *c++='0'; /* all zeros -- make 0 */ |
| 314 | |
| 315 | if (exp==0) { /* integer or NaN case -- easy */ |
| 316 | *c='\0'; /* terminate */ |
| 317 | return string; |
| 318 | } |
| 319 | |
| 320 | /* non-0 exponent */ |
| 321 | e=0; /* assume no E */ |
| 322 | pre=c-cstart+exp; |
| 323 | /* [here, pre-exp is the digits count (==1 for zero)] */ |
| 324 | if (exp>0 || pre<-5) { /* need exponential form */ |
| 325 | e=pre-1; /* calculate E value */ |
| 326 | pre=1; /* assume one digit before '.' */ |
| 327 | } /* exponential form */ |
| 328 | |
| 329 | /* modify the coefficient, adding 0s, '.', and E+nn as needed */ |
| 330 | s=c-1; /* source (LSD) */ |
| 331 | if (pre>0) { /* ddd.ddd (plain), perhaps with E */ |
| 332 | char *dotat=cstart+pre; |
| 333 | if (dotat<c) { /* if embedded dot needed... */ |
| 334 | t=c; /* target */ |
| 335 | for (; s>=dotat; s--, t--) *t=*s; /* open the gap; leave t at gap */ |
| 336 | *t='.'; /* insert the dot */ |
| 337 | c++; /* length increased by one */ |
| 338 | } |
| 339 | |
| 340 | /* finally add the E-part, if needed; it will never be 0, and has */ |
| 341 | /* a maximum length of 3 digits (E-101 case) */ |
| 342 | if (e!=0) { |
| 343 | *c++='E'; /* starts with E */ |
| 344 | *c++='+'; /* assume positive */ |
| 345 | if (e<0) { |
| 346 | *(c-1)='-'; /* oops, need '-' */ |
| 347 | e=-e; /* uInt, please */ |
| 348 | } |
| 349 | u=&BIN2CHAR[e*4]; /* -> length byte */ |
| 350 | memcpy(c, u+4-*u, 4); /* copy fixed 4 characters [is safe] */ |
| 351 | c+=*u; /* bump pointer appropriately */ |
| 352 | } |
| 353 | *c='\0'; /* add terminator */ |
| 354 | /*printf("res %s\n", string); */ |
| 355 | return string; |
| 356 | } /* pre>0 */ |
| 357 | |
| 358 | /* -5<=pre<=0: here for plain 0.ddd or 0.000ddd forms (can never have E) */ |
| 359 | t=c+1-pre; |
| 360 | *(t+1)='\0'; /* can add terminator now */ |
| 361 | for (; s>=cstart; s--, t--) *t=*s; /* shift whole coefficient right */ |
| 362 | c=cstart; |
| 363 | *c++='0'; /* always starts with 0. */ |
| 364 | *c++='.'; |
| 365 | for (; pre<0; pre++) *c++='0'; /* add any 0's after '.' */ |
| 366 | /*printf("res %s\n", string); */ |
| 367 | return string; |
| 368 | } /* decimal32ToString */ |
| 369 | |
| 370 | /* ------------------------------------------------------------------ */ |
| 371 | /* to-number -- conversion from numeric string */ |
| 372 | /* */ |
| 373 | /* decimal32FromString(result, string, set); */ |
| 374 | /* */ |
| 375 | /* result is the decimal32 format number which gets the result of */ |
| 376 | /* the conversion */ |
| 377 | /* *string is the character string which should contain a valid */ |
| 378 | /* number (which may be a special value) */ |
| 379 | /* set is the context */ |
| 380 | /* */ |
| 381 | /* The context is supplied to this routine is used for error handling */ |
| 382 | /* (setting of status and traps) and for the rounding mode, only. */ |
| 383 | /* If an error occurs, the result will be a valid decimal32 NaN. */ |
| 384 | /* ------------------------------------------------------------------ */ |
| 385 | decimal32 * decimal32FromString(decimal32 *result, const char *string, |
| 386 | decContext *set) { |
| 387 | decContext dc; /* work */ |
| 388 | decNumber dn; /* .. */ |
| 389 | |
| 390 | decContextDefault(&dc, DEC_INIT_DECIMAL32); /* no traps, please */ |
| 391 | dc.round=set->round; /* use supplied rounding */ |
| 392 | |
| 393 | decNumberFromString(&dn, string, &dc); /* will round if needed */ |
| 394 | decimal32FromNumber(result, &dn, &dc); |
| 395 | if (dc.status!=0) { /* something happened */ |
| 396 | decContextSetStatus(set, dc.status); /* .. pass it on */ |
| 397 | } |
| 398 | return result; |
| 399 | } /* decimal32FromString */ |
| 400 | |
| 401 | /* ------------------------------------------------------------------ */ |
| 402 | /* decimal32IsCanonical -- test whether encoding is canonical */ |
| 403 | /* d32 is the source decimal32 */ |
| 404 | /* returns 1 if the encoding of d32 is canonical, 0 otherwise */ |
| 405 | /* No error is possible. */ |
| 406 | /* ------------------------------------------------------------------ */ |
| 407 | uInt decimal32IsCanonical(const decimal32 *d32) { |
| 408 | decNumber dn; /* work */ |
| 409 | decimal32 canon; /* .. */ |
| 410 | decContext dc; /* .. */ |
| 411 | decContextDefault(&dc, DEC_INIT_DECIMAL32); |
| 412 | decimal32ToNumber(d32, &dn); |
| 413 | decimal32FromNumber(&canon, &dn, &dc);/* canon will now be canonical */ |
| 414 | return memcmp(d32, &canon, DECIMAL32_Bytes)==0; |
| 415 | } /* decimal32IsCanonical */ |
| 416 | |
| 417 | /* ------------------------------------------------------------------ */ |
| 418 | /* decimal32Canonical -- copy an encoding, ensuring it is canonical */ |
| 419 | /* d32 is the source decimal32 */ |
| 420 | /* result is the target (may be the same decimal32) */ |
| 421 | /* returns result */ |
| 422 | /* No error is possible. */ |
| 423 | /* ------------------------------------------------------------------ */ |
| 424 | decimal32 * decimal32Canonical(decimal32 *result, const decimal32 *d32) { |
| 425 | decNumber dn; /* work */ |
| 426 | decContext dc; /* .. */ |
| 427 | decContextDefault(&dc, DEC_INIT_DECIMAL32); |
| 428 | decimal32ToNumber(d32, &dn); |
| 429 | decimal32FromNumber(result, &dn, &dc);/* result will now be canonical */ |
| 430 | return result; |
| 431 | } /* decimal32Canonical */ |
| 432 | |
| 433 | #if DECTRACE || DECCHECK |
| 434 | /* Macros for accessing decimal32 fields. These assume the argument |
| 435 | is a reference (pointer) to the decimal32 structure, and the |
| 436 | decimal32 is in network byte order (big-endian) */ |
| 437 | /* Get sign */ |
| 438 | #define decimal32Sign(d) ((unsigned)(d)->bytes[0]>>7) |
| 439 | |
| 440 | /* Get combination field */ |
| 441 | #define decimal32Comb(d) (((d)->bytes[0] & 0x7c)>>2) |
| 442 | |
| 443 | /* Get exponent continuation [does not remove bias] */ |
| 444 | #define decimal32ExpCon(d) ((((d)->bytes[0] & 0x03)<<4) \ |
| 445 | | ((unsigned)(d)->bytes[1]>>4)) |
| 446 | |
| 447 | /* Set sign [this assumes sign previously 0] */ |
| 448 | #define decimal32SetSign(d, b) { \ |
| 449 | (d)->bytes[0]|=((unsigned)(b)<<7);} |
| 450 | |
| 451 | /* Set exponent continuation [does not apply bias] */ |
| 452 | /* This assumes range has been checked and exponent previously 0; */ |
| 453 | /* type of exponent must be unsigned */ |
| 454 | #define decimal32SetExpCon(d, e) { \ |
| 455 | (d)->bytes[0]|=(uByte)((e)>>4); \ |
| 456 | (d)->bytes[1]|=(uByte)(((e)&0x0F)<<4);} |
| 457 | |
| 458 | /* ------------------------------------------------------------------ */ |
| 459 | /* decimal32Show -- display a decimal32 in hexadecimal [debug aid] */ |
| 460 | /* d32 -- the number to show */ |
| 461 | /* ------------------------------------------------------------------ */ |
| 462 | /* Also shows sign/cob/expconfields extracted - valid bigendian only */ |
| 463 | void decimal32Show(const decimal32 *d32) { |
| 464 | char buf[DECIMAL32_Bytes*2+1]; |
| 465 | Int i, j=0; |
| 466 | |
| 467 | if (DECLITEND) { |
| 468 | for (i=0; i<DECIMAL32_Bytes; i++, j+=2) { |
| 469 | sprintf(&buf[j], "%02x", d32->bytes[3-i]); |
| 470 | } |
| 471 | printf(" D32> %s [S:%d Cb:%02x Ec:%02x] LittleEndian\n", buf, |
| 472 | d32->bytes[3]>>7, (d32->bytes[3]>>2)&0x1f, |
| 473 | ((d32->bytes[3]&0x3)<<4)| (d32->bytes[2]>>4)); |
| 474 | } |
| 475 | else { |
| 476 | for (i=0; i<DECIMAL32_Bytes; i++, j+=2) { |
| 477 | sprintf(&buf[j], "%02x", d32->bytes[i]); |
| 478 | } |
| 479 | printf(" D32> %s [S:%d Cb:%02x Ec:%02x] BigEndian\n", buf, |
| 480 | decimal32Sign(d32), decimal32Comb(d32), decimal32ExpCon(d32)); |
| 481 | } |
| 482 | } /* decimal32Show */ |
| 483 | #endif |