diff options
Diffstat (limited to 'libdecnumber/dpd/decimal64.h')
| -rw-r--r-- | libdecnumber/dpd/decimal64.h | 163 |
1 files changed, 70 insertions, 93 deletions
diff --git a/libdecnumber/dpd/decimal64.h b/libdecnumber/dpd/decimal64.h index fb7339512dc..549b626536c 100644 --- a/libdecnumber/dpd/decimal64.h +++ b/libdecnumber/dpd/decimal64.h @@ -1,5 +1,5 @@ -/* Decimal 64-bit format module header for the decNumber C Library - Copyright (C) 2005 Free Software Foundation, Inc. +/* Decimal 64-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. @@ -28,97 +28,74 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ -#if !defined(DECIMAL64) -#define DECIMAL64 -#define DEC64NAME "decimal64" /* Short name */ -#define DEC64FULLNAME "Decimal 64-bit Number" /* Verbose name */ -#define DEC64AUTHOR "Mike Cowlishaw" /* Who to blame */ - -#if defined(DECIMAL32) -#error decimal64.h must precede decimal32.h for correct DECNUMDIGITS -#endif +/* ------------------------------------------------------------------ */ +/* Decimal 64-bit format module header */ +/* ------------------------------------------------------------------ */ - /* parameters for decimal64s */ -#define DECIMAL64_Bytes 8 /* length */ -#define DECIMAL64_Pmax 16 /* maximum precision (digits) */ -#define DECIMAL64_Emax 384 /* maximum adjusted exponent */ -#define DECIMAL64_Emin -383 /* minimum adjusted exponent */ -#define DECIMAL64_Bias 398 /* bias for the exponent */ -#define DECIMAL64_String 24 /* maximum string length, +1 */ - /* highest biased exponent (Elimit-1) */ -#define DECIMAL64_Ehigh (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_Pmax+1) - -#ifndef DECNUMDIGITS -#define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined */ -#endif -#ifndef DECNUMBER -#include "decNumber.h" /* context and number library */ -#endif - - /* Decimal 64-bit type, accessible by bytes */ -typedef struct -{ - uint8_t bytes[DECIMAL64_Bytes]; /* decimal64: 1, 5, 8, 50 bits */ -} decimal64; - - /* 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 decimal64 fields. These assume the argument - is a reference (pointer) to the decimal64 structure */ - /* Get sign */ -#define decimal64Sign(d) ((unsigned)(d)->bytes[0]>>7) - - /* Get combination field */ -#define decimal64Comb(d) (((d)->bytes[0] & 0x7c)>>2) - - /* Get exponent continuation [does not remove bias] */ -#define decimal64ExpCon(d) ((((d)->bytes[0] & 0x03)<<6) \ - | ((unsigned)(d)->bytes[1]>>2)) - - /* Set sign [this assumes sign previously 0] */ -#define decimal64SetSign(d, b) { \ - (d)->bytes[0]|=((unsigned)(b)<<7);} - - /* Clear sign */ -#define decimal64ClearSign(d) {(d)->bytes[0]&=~0x80;} - - /* Flip sign */ -#define decimal64FlipSign(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 decimal64SetExpCon(d, e) { \ - (d)->bytes[0]|=(uint8_t)((e)>>6); \ - (d)->bytes[1]|=(uint8_t)(((e)&0x3F)<<2);} - - /* ------------------------------------------------------------------ */ - /* Routines */ - /* ------------------------------------------------------------------ */ - -#ifdef IN_LIBGCC2 -#ifndef decimal64FromString -#define decimal64FromString __decimal64FromString -#define decimal64ToString __decimal64ToString -#define decimal64ToEngString __decimal64ToEngString -#define decimal64FromNumber __decimal64FromNumber -#define decimal64ToNumber __decimal64ToNumber -#endif -#endif - - /* String conversions */ -decimal64 *decimal64FromString (decimal64 *, const char *, decContext *); -char *decimal64ToString (const decimal64 *, char *); -char *decimal64ToEngString (const decimal64 *, char *); - - /* decNumber conversions */ -decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *); -decNumber *decimal64ToNumber (const decimal64 *, decNumber *); +#if !defined(DECIMAL64) + #define DECIMAL64 + #define DEC64NAME "decimal64" /* Short name */ + #define DEC64FULLNAME "Decimal 64-bit Number" /* Verbose name */ + #define DEC64AUTHOR "Mike Cowlishaw" /* Who to blame */ + + + /* parameters for decimal64s */ + #define DECIMAL64_Bytes 8 /* length */ + #define DECIMAL64_Pmax 16 /* maximum precision (digits) */ + #define DECIMAL64_Emax 384 /* maximum adjusted exponent */ + #define DECIMAL64_Emin -383 /* minimum adjusted exponent */ + #define DECIMAL64_Bias 398 /* bias for the exponent */ + #define DECIMAL64_String 24 /* maximum string length, +1 */ + #define DECIMAL64_EconL 8 /* exp. continuation length */ + /* highest biased exponent (Elimit-1) */ + #define DECIMAL64_Ehigh (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_Pmax+1) + + /* check enough digits, if pre-defined */ + #if defined(DECNUMDIGITS) + #if (DECNUMDIGITS<DECIMAL64_Pmax) + #error decimal64.h needs pre-defined DECNUMDIGITS>=16 for safe use + #endif + #endif + + + #ifndef DECNUMDIGITS + #define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined*/ + #endif + #ifndef DECNUMBER + #include "decNumber.h" /* context and number library */ + #endif + + /* Decimal 64-bit type, accessible by bytes */ + typedef struct { + uint8_t bytes[DECIMAL64_Bytes]; /* decimal64: 1, 5, 8, 50 bits*/ + } decimal64; + + /* 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 "decimal64Symbols.h" + + /* String conversions */ + decimal64 * decimal64FromString(decimal64 *, const char *, decContext *); + char * decimal64ToString(const decimal64 *, char *); + char * decimal64ToEngString(const decimal64 *, char *); + + /* decNumber conversions */ + decimal64 * decimal64FromNumber(decimal64 *, const decNumber *, + decContext *); + decNumber * decimal64ToNumber(const decimal64 *, decNumber *); + + /* Format-dependent utilities */ + uint32_t decimal64IsCanonical(const decimal64 *); + decimal64 * decimal64Canonical(decimal64 *, const decimal64 *); #endif |