summaryrefslogtreecommitdiffstats
path: root/qemu/libdecnumber/dpd/decimal32.c
diff options
context:
space:
mode:
Diffstat (limited to 'qemu/libdecnumber/dpd/decimal32.c')
-rw-r--r--qemu/libdecnumber/dpd/decimal32.c488
1 files changed, 0 insertions, 488 deletions
diff --git a/qemu/libdecnumber/dpd/decimal32.c b/qemu/libdecnumber/dpd/decimal32.c
deleted file mode 100644
index 53f29789d..000000000
--- a/qemu/libdecnumber/dpd/decimal32.c
+++ /dev/null
@@ -1,488 +0,0 @@
-/* Decimal 32-bit format module for the decNumber C Library.
- Copyright (C) 2005, 2007 Free Software Foundation, Inc.
- Contributed by IBM Corporation. Author Mike Cowlishaw.
-
- This file is part of GCC.
-
- GCC is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
- version.
-
- In addition to the permissions in the GNU General Public License,
- the Free Software Foundation gives you unlimited permission to link
- the compiled version of this file into combinations with other
- programs, and to distribute those combinations without any
- restriction coming from the use of this file. (The General Public
- License restrictions do apply in other respects; for example, they
- cover modification of the file, and distribution when not linked
- into a combine executable.)
-
- GCC is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License
- along with GCC; see the file COPYING. If not, write to the Free
- Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
-
-/* ------------------------------------------------------------------ */
-/* Decimal 32-bit format module */
-/* ------------------------------------------------------------------ */
-/* This module comprises the routines for decimal32 format numbers. */
-/* Conversions are supplied to and from decNumber and String. */
-/* */
-/* This is used when decNumber provides operations, either for all */
-/* operations or as a proxy between decNumber and decSingle. */
-/* */
-/* Error handling is the same as decNumber (qv.). */
-/* ------------------------------------------------------------------ */
-#include "qemu/osdep.h"
-
-#include "libdecnumber/dconfig.h"
-#define DECNUMDIGITS 7 /* make decNumbers with space for 7 */
-#include "libdecnumber/decNumber.h"
-#include "libdecnumber/decNumberLocal.h"
-#include "libdecnumber/dpd/decimal32.h"
-
-/* Utility tables and routines [in decimal64.c] */
-extern const uInt COMBEXP[32], COMBMSD[32];
-extern const uByte BIN2CHAR[4001];
-
-extern void decDigitsToDPD(const decNumber *, uInt *, Int);
-extern void decDigitsFromDPD(decNumber *, const uInt *, Int);
-
-#if DECTRACE || DECCHECK
-void decimal32Show(const decimal32 *); /* for debug */
-extern void decNumberShow(const decNumber *); /* .. */
-#endif
-
-/* Useful macro */
-/* Clear a structure (e.g., a decNumber) */
-#define DEC_clear(d) memset(d, 0, sizeof(*d))
-
-/* ------------------------------------------------------------------ */
-/* decimal32FromNumber -- convert decNumber to decimal32 */
-/* */
-/* ds is the target decimal32 */
-/* dn is the source number (assumed valid) */
-/* set is the context, used only for reporting errors */
-/* */
-/* The set argument is used only for status reporting and for the */
-/* rounding mode (used if the coefficient is more than DECIMAL32_Pmax */
-/* digits or an overflow is detected). If the exponent is out of the */
-/* valid range then Overflow or Underflow will be raised. */
-/* After Underflow a subnormal result is possible. */
-/* */
-/* DEC_Clamped is set if the number has to be 'folded down' to fit, */
-/* by reducing its exponent and multiplying the coefficient by a */
-/* power of ten, or if the exponent on a zero had to be clamped. */
-/* ------------------------------------------------------------------ */
-decimal32 * decimal32FromNumber(decimal32 *d32, const decNumber *dn,
- decContext *set) {
- uInt status=0; /* status accumulator */
- Int ae; /* adjusted exponent */
- decNumber dw; /* work */
- decContext dc; /* .. */
- uInt *pu; /* .. */
- uInt comb, exp; /* .. */
- uInt targ=0; /* target 32-bit */
-
- /* If the number has too many digits, or the exponent could be */
- /* out of range then reduce the number under the appropriate */
- /* constraints. This could push the number to Infinity or zero, */
- /* so this check and rounding must be done before generating the */
- /* decimal32] */
- ae=dn->exponent+dn->digits-1; /* [0 if special] */
- if (dn->digits>DECIMAL32_Pmax /* too many digits */
- || ae>DECIMAL32_Emax /* likely overflow */
- || ae<DECIMAL32_Emin) { /* likely underflow */
- decContextDefault(&dc, DEC_INIT_DECIMAL32); /* [no traps] */
- dc.round=set->round; /* use supplied rounding */
- decNumberPlus(&dw, dn, &dc); /* (round and check) */
- /* [this changes -0 to 0, so enforce the sign...] */
- dw.bits|=dn->bits&DECNEG;
- status=dc.status; /* save status */
- dn=&dw; /* use the work number */
- } /* maybe out of range */
-
- if (dn->bits&DECSPECIAL) { /* a special value */
- if (dn->bits&DECINF) targ=DECIMAL_Inf<<24;
- else { /* sNaN or qNaN */
- if ((*dn->lsu!=0 || dn->digits>1) /* non-zero coefficient */
- && (dn->digits<DECIMAL32_Pmax)) { /* coefficient fits */
- decDigitsToDPD(dn, &targ, 0);
- }
- if (dn->bits&DECNAN) targ|=DECIMAL_NaN<<24;
- else targ|=DECIMAL_sNaN<<24;
- } /* a NaN */
- } /* special */
-
- else { /* is finite */
- if (decNumberIsZero(dn)) { /* is a zero */
- /* set and clamp exponent */
- if (dn->exponent<-DECIMAL32_Bias) {
- exp=0; /* low clamp */
- status|=DEC_Clamped;
- }
- else {
- exp=dn->exponent+DECIMAL32_Bias; /* bias exponent */
- if (exp>DECIMAL32_Ehigh) { /* top clamp */
- exp=DECIMAL32_Ehigh;
- status|=DEC_Clamped;
- }
- }
- comb=(exp>>3) & 0x18; /* msd=0, exp top 2 bits .. */
- }
- else { /* non-zero finite number */
- uInt msd; /* work */
- Int pad=0; /* coefficient pad digits */
-
- /* the dn is known to fit, but it may need to be padded */
- exp=(uInt)(dn->exponent+DECIMAL32_Bias); /* bias exponent */
- if (exp>DECIMAL32_Ehigh) { /* fold-down case */
- pad=exp-DECIMAL32_Ehigh;
- exp=DECIMAL32_Ehigh; /* [to maximum] */
- status|=DEC_Clamped;
- }
-
- /* fastpath common case */
- if (DECDPUN==3 && pad==0) {
- targ=BIN2DPD[dn->lsu[0]];
- if (dn->digits>3) targ|=(uInt)(BIN2DPD[dn->lsu[1]])<<10;
- msd=(dn->digits==7 ? dn->lsu[2] : 0);
- }
- else { /* general case */
- decDigitsToDPD(dn, &targ, pad);
- /* save and clear the top digit */
- msd=targ>>20;
- targ&=0x000fffff;
- }
-
- /* create the combination field */
- if (msd>=8) comb=0x18 | ((exp>>5) & 0x06) | (msd & 0x01);
- else comb=((exp>>3) & 0x18) | msd;
- }
- targ|=comb<<26; /* add combination field .. */
- targ|=(exp&0x3f)<<20; /* .. and exponent continuation */
- } /* finite */
-
- if (dn->bits&DECNEG) targ|=0x80000000; /* add sign bit */
-
- /* now write to storage; this is endian */
- pu=(uInt *)d32->bytes; /* overlay */
- *pu=targ; /* directly store the int */
-
- if (status!=0) decContextSetStatus(set, status); /* pass on status */
- /* decimal32Show(d32); */
- return d32;
- } /* decimal32FromNumber */
-
-/* ------------------------------------------------------------------ */
-/* decimal32ToNumber -- convert decimal32 to decNumber */
-/* d32 is the source decimal32 */
-/* dn is the target number, with appropriate space */
-/* No error is possible. */
-/* ------------------------------------------------------------------ */
-decNumber * decimal32ToNumber(const decimal32 *d32, decNumber *dn) {
- uInt msd; /* coefficient MSD */
- uInt exp; /* exponent top two bits */
- uInt comb; /* combination field */
- uInt sour; /* source 32-bit */
- const uInt *pu; /* work */
-
- /* load source from storage; this is endian */
- pu=(const uInt *)d32->bytes; /* overlay */
- sour=*pu; /* directly load the int */
-
- comb=(sour>>26)&0x1f; /* combination field */
-
- decNumberZero(dn); /* clean number */
- if (sour&0x80000000) dn->bits=DECNEG; /* set sign if negative */
-
- msd=COMBMSD[comb]; /* decode the combination field */
- exp=COMBEXP[comb]; /* .. */
-
- if (exp==3) { /* is a special */
- if (msd==0) {
- dn->bits|=DECINF;
- return dn; /* no coefficient needed */
- }
- else if (sour&0x02000000) dn->bits|=DECSNAN;
- else dn->bits|=DECNAN;
- msd=0; /* no top digit */
- }
- else { /* is a finite number */
- dn->exponent=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */
- }
-
- /* get the coefficient */
- sour&=0x000fffff; /* clean coefficient continuation */
- if (msd) { /* non-zero msd */
- sour|=msd<<20; /* prefix to coefficient */
- decDigitsFromDPD(dn, &sour, 3); /* process 3 declets */
- return dn;
- }
- /* msd=0 */
- if (!sour) return dn; /* easy: coefficient is 0 */
- if (sour&0x000ffc00) /* need 2 declets? */
- decDigitsFromDPD(dn, &sour, 2); /* process 2 declets */
- else
- decDigitsFromDPD(dn, &sour, 1); /* process 1 declet */
- return dn;
- } /* decimal32ToNumber */
-
-/* ------------------------------------------------------------------ */
-/* to-scientific-string -- conversion to numeric string */
-/* to-engineering-string -- conversion to numeric string */
-/* */
-/* decimal32ToString(d32, string); */
-/* decimal32ToEngString(d32, string); */
-/* */
-/* d32 is the decimal32 format number to convert */
-/* string is the string where the result will be laid out */
-/* */
-/* string must be at least 24 characters */
-/* */
-/* No error is possible, and no status can be set. */
-/* ------------------------------------------------------------------ */
-char * decimal32ToEngString(const decimal32 *d32, char *string){
- decNumber dn; /* work */
- decimal32ToNumber(d32, &dn);
- decNumberToEngString(&dn, string);
- return string;
- } /* decimal32ToEngString */
-
-char * decimal32ToString(const decimal32 *d32, char *string){
- uInt msd; /* coefficient MSD */
- Int exp; /* exponent top two bits or full */
- uInt comb; /* combination field */
- char *cstart; /* coefficient start */
- char *c; /* output pointer in string */
- const uInt *pu; /* work */
- const uByte *u; /* .. */
- char *s, *t; /* .. (source, target) */
- Int dpd; /* .. */
- Int pre, e; /* .. */
- uInt sour; /* source 32-bit */
-
- /* load source from storage; this is endian */
- pu=(const uInt *)d32->bytes; /* overlay */
- sour=*pu; /* directly load the int */
-
- c=string; /* where result will go */
- if (((Int)sour)<0) *c++='-'; /* handle sign */
-
- comb=(sour>>26)&0x1f; /* combination field */
- msd=COMBMSD[comb]; /* decode the combination field */
- exp=COMBEXP[comb]; /* .. */
-
- if (exp==3) {
- if (msd==0) { /* infinity */
- strcpy(c, "Inf");
- strcpy(c+3, "inity");
- return string; /* easy */
- }
- if (sour&0x02000000) *c++='s'; /* sNaN */
- strcpy(c, "NaN"); /* complete word */
- c+=3; /* step past */
- if ((sour&0x000fffff)==0) return string; /* zero payload */
- /* otherwise drop through to add integer; set correct exp */
- exp=0; msd=0; /* setup for following code */
- }
- else exp=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */
-
- /* convert 7 digits of significand to characters */
- cstart=c; /* save start of coefficient */
- if (msd) *c++='0'+(char)msd; /* non-zero most significant digit */
-
- /* Now decode the declets. After extracting each one, it is */
- /* decoded to binary and then to a 4-char sequence by table lookup; */
- /* the 4-chars are a 1-char length (significant digits, except 000 */
- /* has length 0). This allows us to left-align the first declet */
- /* with non-zero content, then remaining ones are full 3-char */
- /* length. We use fixed-length memcpys because variable-length */
- /* causes a subroutine call in GCC. (These are length 4 for speed */
- /* and are safe because the array has an extra terminator byte.) */
- #define dpd2char u=&BIN2CHAR[DPD2BIN[dpd]*4]; \
- if (c!=cstart) {memcpy(c, u+1, 4); c+=3;} \
- else if (*u) {memcpy(c, u+4-*u, 4); c+=*u;}
-
- dpd=(sour>>10)&0x3ff; /* declet 1 */
- dpd2char;
- dpd=(sour)&0x3ff; /* declet 2 */
- dpd2char;
-
- if (c==cstart) *c++='0'; /* all zeros -- make 0 */
-
- if (exp==0) { /* integer or NaN case -- easy */
- *c='\0'; /* terminate */
- return string;
- }
-
- /* non-0 exponent */
- e=0; /* assume no E */
- pre=c-cstart+exp;
- /* [here, pre-exp is the digits count (==1 for zero)] */
- if (exp>0 || pre<-5) { /* need exponential form */
- e=pre-1; /* calculate E value */
- pre=1; /* assume one digit before '.' */
- } /* exponential form */
-
- /* modify the coefficient, adding 0s, '.', and E+nn as needed */
- s=c-1; /* source (LSD) */
- if (pre>0) { /* ddd.ddd (plain), perhaps with E */
- char *dotat=cstart+pre;
- if (dotat<c) { /* if embedded dot needed... */
- t=c; /* target */
- for (; s>=dotat; s--, t--) *t=*s; /* open the gap; leave t at gap */
- *t='.'; /* insert the dot */
- c++; /* length increased by one */
- }
-
- /* finally add the E-part, if needed; it will never be 0, and has */
- /* a maximum length of 3 digits (E-101 case) */
- if (e!=0) {
- *c++='E'; /* starts with E */
- *c++='+'; /* assume positive */
- if (e<0) {
- *(c-1)='-'; /* oops, need '-' */
- e=-e; /* uInt, please */
- }
- u=&BIN2CHAR[e*4]; /* -> length byte */
- memcpy(c, u+4-*u, 4); /* copy fixed 4 characters [is safe] */
- c+=*u; /* bump pointer appropriately */
- }
- *c='\0'; /* add terminator */
- /*printf("res %s\n", string); */
- return string;
- } /* pre>0 */
-
- /* -5<=pre<=0: here for plain 0.ddd or 0.000ddd forms (can never have E) */
- t=c+1-pre;
- *(t+1)='\0'; /* can add terminator now */
- for (; s>=cstart; s--, t--) *t=*s; /* shift whole coefficient right */
- c=cstart;
- *c++='0'; /* always starts with 0. */
- *c++='.';
- for (; pre<0; pre++) *c++='0'; /* add any 0's after '.' */
- /*printf("res %s\n", string); */
- return string;
- } /* decimal32ToString */
-
-/* ------------------------------------------------------------------ */
-/* to-number -- conversion from numeric string */
-/* */
-/* decimal32FromString(result, string, set); */
-/* */
-/* result is the decimal32 format number which gets the result of */
-/* the conversion */
-/* *string is the character string which should contain a valid */
-/* number (which may be a special value) */
-/* set is the context */
-/* */
-/* The context is supplied to this routine is used for error handling */
-/* (setting of status and traps) and for the rounding mode, only. */
-/* If an error occurs, the result will be a valid decimal32 NaN. */
-/* ------------------------------------------------------------------ */
-decimal32 * decimal32FromString(decimal32 *result, const char *string,
- decContext *set) {
- decContext dc; /* work */
- decNumber dn; /* .. */
-
- decContextDefault(&dc, DEC_INIT_DECIMAL32); /* no traps, please */
- dc.round=set->round; /* use supplied rounding */
-
- decNumberFromString(&dn, string, &dc); /* will round if needed */
- decimal32FromNumber(result, &dn, &dc);
- if (dc.status!=0) { /* something happened */
- decContextSetStatus(set, dc.status); /* .. pass it on */
- }
- return result;
- } /* decimal32FromString */
-
-/* ------------------------------------------------------------------ */
-/* decimal32IsCanonical -- test whether encoding is canonical */
-/* d32 is the source decimal32 */
-/* returns 1 if the encoding of d32 is canonical, 0 otherwise */
-/* No error is possible. */
-/* ------------------------------------------------------------------ */
-uint32_t decimal32IsCanonical(const decimal32 *d32) {
- decNumber dn; /* work */
- decimal32 canon; /* .. */
- decContext dc; /* .. */
- decContextDefault(&dc, DEC_INIT_DECIMAL32);
- decimal32ToNumber(d32, &dn);
- decimal32FromNumber(&canon, &dn, &dc);/* canon will now be canonical */
- return memcmp(d32, &canon, DECIMAL32_Bytes)==0;
- } /* decimal32IsCanonical */
-
-/* ------------------------------------------------------------------ */
-/* decimal32Canonical -- copy an encoding, ensuring it is canonical */
-/* d32 is the source decimal32 */
-/* result is the target (may be the same decimal32) */
-/* returns result */
-/* No error is possible. */
-/* ------------------------------------------------------------------ */
-decimal32 * decimal32Canonical(decimal32 *result, const decimal32 *d32) {
- decNumber dn; /* work */
- decContext dc; /* .. */
- decContextDefault(&dc, DEC_INIT_DECIMAL32);
- decimal32ToNumber(d32, &dn);
- decimal32FromNumber(result, &dn, &dc);/* result will now be canonical */
- return result;
- } /* decimal32Canonical */
-
-#if DECTRACE || DECCHECK
-/* Macros for accessing decimal32 fields. These assume the argument
- is a reference (pointer) to the decimal32 structure, and the
- decimal32 is in network byte order (big-endian) */
-/* Get sign */
-#define decimal32Sign(d) ((unsigned)(d)->bytes[0]>>7)
-
-/* Get combination field */
-#define decimal32Comb(d) (((d)->bytes[0] & 0x7c)>>2)
-
-/* Get exponent continuation [does not remove bias] */
-#define decimal32ExpCon(d) ((((d)->bytes[0] & 0x03)<<4) \
- | ((unsigned)(d)->bytes[1]>>4))
-
-/* Set sign [this assumes sign previously 0] */
-#define decimal32SetSign(d, b) { \
- (d)->bytes[0]|=((unsigned)(b)<<7);}
-
-/* Set exponent continuation [does not apply bias] */
-/* This assumes range has been checked and exponent previously 0; */
-/* type of exponent must be unsigned */
-#define decimal32SetExpCon(d, e) { \
- (d)->bytes[0]|=(uint8_t)((e)>>4); \
- (d)->bytes[1]|=(uint8_t)(((e)&0x0F)<<4);}
-
-/* ------------------------------------------------------------------ */
-/* decimal32Show -- display a decimal32 in hexadecimal [debug aid] */
-/* d32 -- the number to show */
-/* ------------------------------------------------------------------ */
-/* Also shows sign/cob/expconfields extracted - valid bigendian only */
-void decimal32Show(const decimal32 *d32) {
- char buf[DECIMAL32_Bytes*2+1];
- Int i, j=0;
-
- if (DECLITEND) {
- for (i=0; i<DECIMAL32_Bytes; i++, j+=2) {
- sprintf(&buf[j], "%02x", d32->bytes[3-i]);
- }
- printf(" D32> %s [S:%d Cb:%02x Ec:%02x] LittleEndian\n", buf,
- d32->bytes[3]>>7, (d32->bytes[3]>>2)&0x1f,
- ((d32->bytes[3]&0x3)<<4)| (d32->bytes[2]>>4));
- }
- else {
- for (i=0; i<DECIMAL32_Bytes; i++, j+=2) {
- sprintf(&buf[j], "%02x", d32->bytes[i]);
- }
- printf(" D32> %s [S:%d Cb:%02x Ec:%02x] BigEndian\n", buf,
- decimal32Sign(d32), decimal32Comb(d32), decimal32ExpCon(d32));
- }
- } /* decimal32Show */
-#endif