diff options
Diffstat (limited to 'libdecnumber/dpd/decimal128.h')
| -rw-r--r-- | libdecnumber/dpd/decimal128.h | 165 |
1 files changed, 68 insertions, 97 deletions
diff --git a/libdecnumber/dpd/decimal128.h b/libdecnumber/dpd/decimal128.h index a6bc87bb4a3..f8f5b5a8ff2 100644 --- a/libdecnumber/dpd/decimal128.h +++ b/libdecnumber/dpd/decimal128.h @@ -1,5 +1,5 @@ -/* Decimal 128-bit format module header for the decNumber C Library - Copyright (C) 2005 Free Software Foundation, Inc. +/* Decimal 128-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. @@ -28,103 +28,74 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ +/* ------------------------------------------------------------------ */ +/* Decimal 128-bit format module header */ +/* ------------------------------------------------------------------ */ + #if !defined(DECIMAL128) -#define DECIMAL128 -#define DEC128NAME "decimal128" /* Short name */ -#define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */ -#define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */ - -#if defined(DECIMAL32) -#error decimal128.h must precede decimal32.h for correct DECNUMDIGITS -#else -#if defined(DECIMAL64) -#error decimal128.h must precede decimal64.h for correct DECNUMDIGITS -#endif -#endif + #define DECIMAL128 + #define DEC128NAME "decimal128" /* Short name */ + #define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */ + #define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */ /* parameters for decimal128s */ -#define DECIMAL128_Bytes 16 /* length */ -#define DECIMAL128_Pmax 34 /* maximum precision (digits) */ -#define DECIMAL128_Emax 6144 /* maximum adjusted exponent */ -#define DECIMAL128_Emin -6143 /* minimum adjusted exponent */ -#define DECIMAL128_Bias 6176 /* bias for the exponent */ -#define DECIMAL128_String 43 /* maximum string length, +1 */ - /* highest biased exponent (Elimit-1) */ -#define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1) - -#ifndef DECNUMDIGITS -#define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined */ -#endif -#ifndef DECNUMBER -#include "decNumber.h" /* context and number library */ -#endif - - /* Decimal 128-bit type, accessible by bytes */ -typedef struct -{ - uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits */ -} decimal128; - - /* 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 decimal128 fields. These assume the argument - is a reference (pointer) to the decimal128 structure */ - /* Get sign */ -#define decimal128Sign(d) ((unsigned)(d)->bytes[0]>>7) - - /* Get combination field */ -#define decimal128Comb(d) (((d)->bytes[0] & 0x7c)>>2) - - /* Get exponent continuation [does not remove bias] */ -#define decimal128ExpCon(d) ((((d)->bytes[0] & 0x03)<<10) \ - | ((unsigned)(d)->bytes[1]<<2) \ - | ((unsigned)(d)->bytes[2]>>6)) - - /* Set sign [this assumes sign previously 0] */ -#define decimal128SetSign(d, b) { \ - (d)->bytes[0]|=((unsigned)(b)<<7);} - - /* Clear sign */ -#define decimal128ClearSign(d) {(d)->bytes[0]&=~0x80;} - - /* Flip sign */ -#define decimal128FlipSign(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 decimal128SetExpCon(d, e) { \ - (d)->bytes[0]|=(uint8_t)((e)>>10); \ - (d)->bytes[1] =(uint8_t)(((e)&0x3fc)>>2); \ - (d)->bytes[2]|=(uint8_t)(((e)&0x03)<<6);} - - /* ------------------------------------------------------------------ */ - /* Routines */ - /* ------------------------------------------------------------------ */ - -#ifdef IN_LIBGCC2 -#ifndef decimal128FromString -#define decimal128FromString __decimal128FromString -#define decimal128ToString __decimal128ToString -#define decimal128ToEngString __decimal128ToEngString -#define decimal128FromNumber __decimal128FromNumber -#define decimal128ToNumber __decimal128ToNumber -#endif -#endif - - /* String conversions */ -decimal128 *decimal128FromString (decimal128 *, const char *, decContext *); -char *decimal128ToString (const decimal128 *, char *); -char *decimal128ToEngString (const decimal128 *, char *); - - /* decNumber conversions */ -decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *); -decNumber *decimal128ToNumber (const decimal128 *, decNumber *); + #define DECIMAL128_Bytes 16 /* length */ + #define DECIMAL128_Pmax 34 /* maximum precision (digits) */ + #define DECIMAL128_Emax 6144 /* maximum adjusted exponent */ + #define DECIMAL128_Emin -6143 /* minimum adjusted exponent */ + #define DECIMAL128_Bias 6176 /* bias for the exponent */ + #define DECIMAL128_String 43 /* maximum string length, +1 */ + #define DECIMAL128_EconL 12 /* exp. continuation length */ + /* highest biased exponent (Elimit-1) */ + #define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1) + + /* check enough digits, if pre-defined */ + #if defined(DECNUMDIGITS) + #if (DECNUMDIGITS<DECIMAL128_Pmax) + #error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use + #endif + #endif + + #ifndef DECNUMDIGITS + #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/ + #endif + #ifndef DECNUMBER + #include "decNumber.h" /* context and number library */ + #endif + + /* Decimal 128-bit type, accessible by bytes */ + typedef struct { + uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/ + } decimal128; + + /* 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 + + #include "decimal128Local.h" + + /* ---------------------------------------------------------------- */ + /* Routines */ + /* ---------------------------------------------------------------- */ + + #include "decimal128Symbols.h" + + /* String conversions */ + decimal128 * decimal128FromString(decimal128 *, const char *, decContext *); + char * decimal128ToString(const decimal128 *, char *); + char * decimal128ToEngString(const decimal128 *, char *); + + /* decNumber conversions */ + decimal128 * decimal128FromNumber(decimal128 *, const decNumber *, + decContext *); + decNumber * decimal128ToNumber(const decimal128 *, decNumber *); + + /* Format-dependent utilities */ + uint32_t decimal128IsCanonical(const decimal128 *); + decimal128 * decimal128Canonical(decimal128 *, const decimal128 *); #endif |