diff options
Diffstat (limited to 'libdecnumber/dpd/decimal32.h')
| -rw-r--r-- | libdecnumber/dpd/decimal32.h | 149 |
1 files changed, 64 insertions, 85 deletions
diff --git a/libdecnumber/dpd/decimal32.h b/libdecnumber/dpd/decimal32.h index cbe8ab4a65c..0d530464172 100644 --- a/libdecnumber/dpd/decimal32.h +++ b/libdecnumber/dpd/decimal32.h @@ -1,5 +1,5 @@ -/* Decimal 32-bit format module header for the decNumber C Library - Copyright (C) 2005 Free Software Foundation, Inc. +/* Decimal 32-bit format module header 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. @@ -28,93 +28,72 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ +/* ------------------------------------------------------------------ */ +/* Decimal 32-bit format module header */ +/* ------------------------------------------------------------------ */ + #if !defined(DECIMAL32) -#define DECIMAL32 -#define DEC32NAME "decimal32" /* Short name */ -#define DEC32FULLNAME "Decimal 32-bit Number" /* Verbose name */ -#define DEC32AUTHOR "Mike Cowlishaw" /* Who to blame */ + #define DECIMAL32 + #define DEC32NAME "decimal32" /* Short name */ + #define DEC32FULLNAME "Decimal 32-bit Number" /* Verbose name */ + #define DEC32AUTHOR "Mike Cowlishaw" /* Who to blame */ /* parameters for decimal32s */ -#define DECIMAL32_Bytes 4 /* length */ -#define DECIMAL32_Pmax 7 /* maximum precision (digits) */ -#define DECIMAL32_Emax 96 /* maximum adjusted exponent */ -#define DECIMAL32_Emin -95 /* minimum adjusted exponent */ -#define DECIMAL32_Bias 101 /* bias for the exponent */ -#define DECIMAL32_String 15 /* maximum string length, +1 */ - /* highest biased exponent (Elimit-1) */ -#define DECIMAL32_Ehigh (DECIMAL32_Emax+DECIMAL32_Bias-DECIMAL32_Pmax+1) - -#ifndef DECNUMDIGITS -#define DECNUMDIGITS DECIMAL32_Pmax /* size if not already defined */ -#endif -#ifndef DECNUMBER -#include "decNumber.h" /* context and number library */ -#endif + #define DECIMAL32_Bytes 4 /* length */ + #define DECIMAL32_Pmax 7 /* maximum precision (digits) */ + #define DECIMAL32_Emax 96 /* maximum adjusted exponent */ + #define DECIMAL32_Emin -95 /* minimum adjusted exponent */ + #define DECIMAL32_Bias 101 /* bias for the exponent */ + #define DECIMAL32_String 15 /* maximum string length, +1 */ + #define DECIMAL32_EconL 6 /* exp. continuation length */ + /* highest biased exponent (Elimit-1) */ + #define DECIMAL32_Ehigh (DECIMAL32_Emax+DECIMAL32_Bias-DECIMAL32_Pmax+1) + + /* check enough digits, if pre-defined */ + #if defined(DECNUMDIGITS) + #if (DECNUMDIGITS<DECIMAL32_Pmax) + #error decimal32.h needs pre-defined DECNUMDIGITS>=7 for safe use + #endif + #endif + + #ifndef DECNUMDIGITS + #define DECNUMDIGITS DECIMAL32_Pmax /* size if not already defined*/ + #endif + #ifndef DECNUMBER + #include "decNumber.h" /* context and number library */ + #endif /* Decimal 32-bit type, accessible by bytes */ -typedef struct -{ - uint8_t bytes[DECIMAL32_Bytes]; /* decimal32: 1, 5, 6, 20 bits */ -} decimal32; - - /* special values [top byte excluding sign bit; last two bits are - don't-care for Infinity on input, last bit don't-care for NaN] */ -#if !defined(DECIMAL_NaN) -#define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ -#define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ -#define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ -#endif - - /* Macros for accessing decimal32 fields. These assume the argument - is a reference (pointer) to the decimal32 structure */ - /* 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);} - - /* Clear sign */ -#define decimal32ClearSign(d) {(d)->bytes[0]&=~0x80;} - - /* Flip sign */ -#define decimal32FlipSign(d) {(d)->bytes[0]^=0x80;} - - /* 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);} - - /* ------------------------------------------------------------------ */ - /* Routines */ - /* ------------------------------------------------------------------ */ - -#ifdef IN_LIBGCC2 -#ifndef decimal32FromString -#define decimal32FromString __decimal32FromString -#define decimal32ToString __decimal32ToString -#define decimal32ToEngString __decimal32ToEngString -#define decimal32FromNumber __decimal32FromNumber -#define decimal32ToNumber __decimal32ToNumber -#endif -#endif - -/* String conversions. */ -decimal32 *decimal32FromString (decimal32 *, const char *, decContext *); -char *decimal32ToString (const decimal32 *, char *); -char *decimal32ToEngString (const decimal32 *, char *); - -/* decNumber conversions. */ -decimal32 *decimal32FromNumber (decimal32 *, const decNumber *, decContext *); -decNumber *decimal32ToNumber (const decimal32 *, decNumber *); + typedef struct { + uint8_t bytes[DECIMAL32_Bytes]; /* decimal32: 1, 5, 6, 20 bits*/ + } decimal32; + + /* special values [top byte excluding sign bit; last two bits are */ + /* don't-care for Infinity on input, last bit don't-care for NaN] */ + #if !defined(DECIMAL_NaN) + #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ + #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ + #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ + #endif + + /* ---------------------------------------------------------------- */ + /* Routines */ + /* ---------------------------------------------------------------- */ + + #include "decimal32Symbols.h" + + /* String conversions */ + decimal32 * decimal32FromString(decimal32 *, const char *, decContext *); + char * decimal32ToString(const decimal32 *, char *); + char * decimal32ToEngString(const decimal32 *, char *); + + /* decNumber conversions */ + decimal32 * decimal32FromNumber(decimal32 *, const decNumber *, + decContext *); + decNumber * decimal32ToNumber(const decimal32 *, decNumber *); + + /* Format-dependent utilities */ + uint32_t decimal32IsCanonical(const decimal32 *); + decimal32 * decimal32Canonical(decimal32 *, const decimal32 *); #endif |