/* Decimal Context module header for the decNumber C Library Copyright (C) 2005, 2006 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. 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. */ /* ------------------------------------------------------------------ */ /* */ /* Context must always be set correctly: */ /* */ /* digits -- must be in the range 1 through 999999999 */ /* emax -- must be in the range 0 through 999999999 */ /* emin -- must be in the range 0 through -999999999 */ /* round -- must be one of the enumerated rounding modes */ /* traps -- only defined bits may be set */ /* status -- [any bits may be cleared, but not set, by user] */ /* clamp -- must be either 0 or 1 */ /* extended -- must be either 0 or 1 [present only if DECSUBSET] */ /* */ /* ------------------------------------------------------------------ */ #if !defined(DECCONTEXT) #define DECCONTEXT #define DECCNAME "decContext" /* Short name */ #define DECCFULLNAME "Decimal Context Descriptor" /* Verbose name */ #define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */ #include "gstdint.h" /* C99 standard integers */ #include /* for traps */ /* Conditional code flag -- set this to 0 for best performance */ #define DECSUBSET 0 /* 1 to enable subset arithmetic */ /* Context for operations, with associated constants */ enum rounding { DEC_ROUND_CEILING, /* round towards +infinity */ DEC_ROUND_UP, /* round away from 0 */ DEC_ROUND_HALF_UP, /* 0.5 rounds up */ DEC_ROUND_HALF_EVEN, /* 0.5 rounds to nearest even */ DEC_ROUND_HALF_DOWN, /* 0.5 rounds down */ DEC_ROUND_DOWN, /* round towards 0 (truncate) */ DEC_ROUND_FLOOR, /* round towards -infinity */ DEC_ROUND_MAX /* enum must be less than this */ }; typedef struct { int32_t digits; /* working precision */ int32_t emax; /* maximum positive exponent */ int32_t emin; /* minimum negative exponent */ enum rounding round; /* rounding mode */ uint32_t traps; /* trap-enabler flags */ uint32_t status; /* status flags */ uint8_t clamp; /* flag: apply IEEE exponent clamp */ #if DECSUBSET uint8_t extended; /* flag: special-values allowed */ #endif } decContext; /* Maxima and Minima */ #define DEC_MAX_DIGITS 999999999 #define DEC_MIN_DIGITS 1 #define DEC_MAX_EMAX 999999999 #define DEC_MIN_EMAX 0 #define DEC_MAX_EMIN 0 #define DEC_MIN_EMIN -999999999 /* Trap-enabler and Status flags (exceptional conditions), and their names */ /* Top byte is reserved for internal use */ #define DEC_Conversion_syntax 0x00000001 #define DEC_Division_by_zero 0x00000002 #define DEC_Division_impossible 0x00000004 #define DEC_Division_undefined 0x00000008 #define DEC_Insufficient_storage 0x00000010 /* [used if malloc fails] */ #define DEC_Inexact 0x00000020 #define DEC_Invalid_context 0x00000040 #define DEC_Invalid_operation 0x00000080 #if DECSUBSET #define DEC_Lost_digits 0x00000100 #endif #define DEC_Overflow 0x00000200 #define DEC_Clamped 0x00000400 #define DEC_Rounded 0x00000800 #define DEC_Subnormal 0x00001000 #define DEC_Underflow 0x00002000 /* IEEE 854 groupings for the flags */ /* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal are */ /* not in IEEE 854] */ #define DEC_IEEE_854_Division_by_zero (DEC_Division_by_zero) #if DECSUBSET #define DEC_IEEE_854_Inexact (DEC_Inexact | DEC_Lost_digits) #else #define DEC_IEEE_854_Inexact (DEC_Inexact) #endif #define DEC_IEEE_854_Invalid_operation (DEC_Conversion_syntax | \ DEC_Division_impossible | \ DEC_Division_undefined | \ DEC_Insufficient_storage | \ DEC_Invalid_context | \ DEC_Invalid_operation) #define DEC_IEEE_854_Overflow (DEC_Overflow) #define DEC_IEEE_854_Underflow (DEC_Underflow) /* flags which are normally errors (results are qNaN, infinite, or 0) */ #define DEC_Errors (DEC_IEEE_854_Division_by_zero | \ DEC_IEEE_854_Invalid_operation | \ DEC_IEEE_854_Overflow | DEC_IEEE_854_Underflow) /* flags which cause a result to become qNaN */ #define DEC_NaNs DEC_IEEE_854_Invalid_operation /* flags which are normally for information only (have finite results) */ #if DECSUBSET #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact \ | DEC_Lost_digits) #else #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact) #endif /* name strings for the exceptional conditions */ #define DEC_Condition_CS "Conversion syntax" #define DEC_Condition_DZ "Division by zero" #define DEC_Condition_DI "Division impossible" #define DEC_Condition_DU "Division undefined" #define DEC_Condition_IE "Inexact" #define DEC_Condition_IS "Insufficient storage" #define DEC_Condition_IC "Invalid context" #define DEC_Condition_IO "Invalid operation" #if DECSUBSET #define DEC_Condition_LD "Lost digits" #endif #define DEC_Condition_OV "Overflow" #define DEC_Condition_PA "Clamped" #define DEC_Condition_RO "Rounded" #define DEC_Condition_SU "Subnormal" #define DEC_Condition_UN "Underflow" #define DEC_Condition_ZE "No status" #define DEC_Condition_MU "Multiple status" #define DEC_Condition_Length 21 /* length of the longest string, */ /* including terminator */ /* Initialization descriptors, used by decContextDefault */ #define DEC_INIT_BASE 0 #define DEC_INIT_DECIMAL32 32 #define DEC_INIT_DECIMAL64 64 #define DEC_INIT_DECIMAL128 128 /* decContext routines */ #ifdef IN_LIBGCC2 #define decContextDefault __decContextDefault #define decContextSetStatus __decContextSetStatus #define decContextStatusToString __decContextStatusToString #define decContextSetStatusFromString __decContextSetStatusFromString #endif decContext *decContextDefault (decContext *, int32_t); decContext *decContextSetStatus (decContext *, uint32_t); const char *decContextStatusToString (decContext *); decContext *decContextSetStatusFromString (decContext *, char *); #endif