Mercurial > hg > CbC > CbC_gcc
annotate libdecnumber/dpd/decimal32.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Decimal 32-bit format module for the decNumber C Library. |
| 145 | 2 Copyright (C) 2005-2020 Free Software Foundation, Inc. |
| 0 | 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 /* ------------------------------------------------------------------ */ | |
|
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27 /* Decimal 32-bit format module */ |
| 0 | 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 | |
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40 #include "dconfig.h" /* GCC definitions */ |
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41 #define DECNUMDIGITS 7 /* make decNumbers with space for 7 */ |
| 0 | 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 /* */ | |
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67 /* ds is the target decimal32 */ |
| 0 | 68 /* dn is the source number (assumed valid) */ |
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69 /* set is the context, used only for reporting errors */ |
| 0 | 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; /* .. */ | |
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88 uInt uiwork; /* for macros */ |
| 0 | 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] */ | |
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96 ae=dn->exponent+dn->digits-1; /* [0 if special] */ |
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97 if (dn->digits>DECIMAL32_Pmax /* too many digits */ |
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98 || ae>DECIMAL32_Emax /* likely overflow */ |
| 0 | 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 */ | |
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112 if ((*dn->lsu!=0 || dn->digits>1) /* non-zero coefficient */ |
| 0 | 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 */ | |
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138 uInt msd; /* work */ |
| 0 | 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 */ | |
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173 UBFROMUI(d32->bytes, targ); /* directly store the int */ |
| 0 | 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 */ | |
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191 uInt uiwork; /* for macros */ |
| 0 | 192 |
| 193 /* load source from storage; this is endian */ | |
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194 sour=UBTOUI(d32->bytes); /* directly load the int */ |
| 0 | 195 |
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196 comb=(sour>>26)&0x1f; /* combination field */ |
| 0 | 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 | |
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204 if (exp==3) { /* is a special */ |
| 0 | 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 */ | |
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225 if (!sour) return dn; /* easy: coefficient is 0 */ |
| 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 /* ------------------------------------------------------------------ */ | |
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234 /* to-scientific-string -- conversion to numeric string */ |
| 0 | 235 /* to-engineering-string -- conversion to numeric string */ |
| 236 /* */ | |
| 237 /* decimal32ToString(d32, string); */ | |
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238 /* decimal32ToEngString(d32, string); */ |
| 0 | 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){ | |
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248 decNumber dn; /* work */ |
| 0 | 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 */ | |
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258 char *cstart; /* coefficient start */ |
| 0 | 259 char *c; /* output pointer in string */ |
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260 const uByte *u; /* work */ |
| 0 | 261 char *s, *t; /* .. (source, target) */ |
| 262 Int dpd; /* .. */ | |
| 263 Int pre, e; /* .. */ | |
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264 uInt uiwork; /* for macros */ |
| 0 | 265 uInt sour; /* source 32-bit */ |
| 266 | |
| 267 /* load source from storage; this is endian */ | |
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268 sour=UBTOUI(d32->bytes); /* directly load the int */ |
| 0 | 269 |
| 270 c=string; /* where result will go */ | |
| 271 if (((Int)sour)<0) *c++='-'; /* handle sign */ | |
| 272 | |
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273 comb=(sour>>26)&0x1f; /* combination field */ |
| 0 | 274 msd=COMBMSD[comb]; /* decode the combination field */ |
| 275 exp=COMBEXP[comb]; /* .. */ | |
| 276 | |
| 277 if (exp==3) { | |
| 278 if (msd==0) { /* infinity */ | |
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279 strcpy(c, "Inf"); |
| 0 | 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.) */ | |
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304 #define dpd2char u=&BIN2CHAR[DPD2BIN[dpd]*4]; \ |
| 0 | 305 if (c!=cstart) {memcpy(c, u+1, 4); c+=3;} \ |
| 306 else if (*u) {memcpy(c, u+4-*u, 4); c+=*u;} | |
| 307 | |
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308 dpd=(sour>>10)&0x3ff; /* declet 1 */ |
| 0 | 309 dpd2char; |
| 310 dpd=(sour)&0x3ff; /* declet 2 */ | |
| 311 dpd2char; | |
| 312 | |
| 313 if (c==cstart) *c++='0'; /* all zeros -- make 0 */ | |
| 314 | |
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315 if (exp==0) { /* integer or NaN case -- easy */ |
| 0 | 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) { | |
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343 *c++='E'; /* starts with E */ |
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344 *c++='+'; /* assume positive */ |
| 0 | 345 if (e<0) { |
| 346 *(c-1)='-'; /* oops, need '-' */ | |
| 347 e=-e; /* uInt, please */ | |
| 348 } | |
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349 u=&BIN2CHAR[e*4]; /* -> length byte */ |
| 0 | 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) */ | |
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379 /* set is the context */ |
| 0 | 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 */ | |
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388 decNumber dn; /* .. */ |
| 0 | 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 */ | |
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404 /* returns 1 if the encoding of d32 is canonical, 0 otherwise */ |
| 0 | 405 /* No error is possible. */ |
| 406 /* ------------------------------------------------------------------ */ | |
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407 uInt decimal32IsCanonical(const decimal32 *d32) { |
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408 decNumber dn; /* work */ |
| 0 | 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) { | |
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425 decNumber dn; /* work */ |
| 0 | 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) { \ | |
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455 (d)->bytes[0]|=(uByte)((e)>>4); \ |
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456 (d)->bytes[1]|=(uByte)(((e)&0x0F)<<4);} |
| 0 | 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 |