| /* Decimal context header 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 Context module header */ |
| /* ------------------------------------------------------------------ */ |
| /* */ |
| /* Context variables must always have valid values: */ |
| /* */ |
| /* status -- [any bits may be cleared, but not set, by user] */ |
| /* round -- must be one of the enumerated rounding modes */ |
| /* */ |
| /* The following variables are implied for fixed size formats (i.e., */ |
| /* they are ignored) but should still be set correctly in case used */ |
| /* with decNumber functions: */ |
| /* */ |
| /* clamp -- must be either 0 or 1 */ |
| /* 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 */ |
| /* extended -- must be either 0 or 1 [present only if DECSUBSET] */ |
| /* traps -- only defined bits may be set */ |
| /* */ |
| /* ------------------------------------------------------------------ */ |
| |
| #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 <stdint.h> |
| #include <stdio.h> /* for printf, etc. */ |
| #include <signal.h> /* for traps */ |
| |
| /* Extended flags setting -- set this to 0 to use only IEEE flags */ |
| #define DECEXTFLAG 1 /* 1=enable extended flags */ |
| |
| /* Conditional code flag -- set this to 0 for best performance */ |
| #define DECSUBSET 0 /* 1=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_05UP, /* round for reround */ |
| DEC_ROUND_MAX /* enum must be less than this */ |
| }; |
| #define DEC_ROUND_DEFAULT DEC_ROUND_HALF_EVEN; |
| |
| 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 for context settings */ |
| #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 |
| #define DEC_MAX_MATH 999999 /* max emax, etc., for math funcs. */ |
| |
| /* Classifications for decimal numbers, aligned with 754r (note */ |
| /* that 'normal' and 'subnormal' are meaningful only with a */ |
| /* decContext or a fixed size format). */ |
| enum decClass { |
| DEC_CLASS_SNAN, |
| DEC_CLASS_QNAN, |
| DEC_CLASS_NEG_INF, |
| DEC_CLASS_NEG_NORMAL, |
| DEC_CLASS_NEG_SUBNORMAL, |
| DEC_CLASS_NEG_ZERO, |
| DEC_CLASS_POS_ZERO, |
| DEC_CLASS_POS_SUBNORMAL, |
| DEC_CLASS_POS_NORMAL, |
| DEC_CLASS_POS_INF |
| }; |
| /* Strings for the decClasses */ |
| #define DEC_ClassString_SN "sNaN" |
| #define DEC_ClassString_QN "NaN" |
| #define DEC_ClassString_NI "-Infinity" |
| #define DEC_ClassString_NN "-Normal" |
| #define DEC_ClassString_NS "-Subnormal" |
| #define DEC_ClassString_NZ "-Zero" |
| #define DEC_ClassString_PZ "+Zero" |
| #define DEC_ClassString_PS "+Subnormal" |
| #define DEC_ClassString_PN "+Normal" |
| #define DEC_ClassString_PI "+Infinity" |
| #define DEC_ClassString_UN "Invalid" |
| |
| /* Trap-enabler and Status flags (exceptional conditions), and */ |
| /* their names. The top byte is reserved for internal use */ |
| #if DECEXTFLAG |
| /* Extended flags */ |
| #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 /* [when 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 |
| #else |
| /* IEEE flags only */ |
| #define DEC_Conversion_syntax 0x00000010 |
| #define DEC_Division_by_zero 0x00000002 |
| #define DEC_Division_impossible 0x00000010 |
| #define DEC_Division_undefined 0x00000010 |
| #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ |
| #define DEC_Inexact 0x00000001 |
| #define DEC_Invalid_context 0x00000010 |
| #define DEC_Invalid_operation 0x00000010 |
| #if DECSUBSET |
| #define DEC_Lost_digits 0x00000000 |
| #endif |
| #define DEC_Overflow 0x00000008 |
| #define DEC_Clamped 0x00000000 |
| #define DEC_Rounded 0x00000000 |
| #define DEC_Subnormal 0x00000000 |
| #define DEC_Underflow 0x00000004 |
| #endif |
| |
| /* 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 (result is 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 (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 |
| /* Synonyms */ |
| #define DEC_INIT_DECSINGLE DEC_INIT_DECIMAL32 |
| #define DEC_INIT_DECDOUBLE DEC_INIT_DECIMAL64 |
| #define DEC_INIT_DECQUAD DEC_INIT_DECIMAL128 |
| |
| /* decContext routines */ |
| |
| |
| extern decContext * decContextClearStatus(decContext *, uint32_t); |
| extern decContext * decContextDefault(decContext *, int32_t); |
| extern enum rounding decContextGetRounding(decContext *); |
| extern uint32_t decContextGetStatus(decContext *); |
| extern decContext * decContextRestoreStatus(decContext *, uint32_t, uint32_t); |
| extern uint32_t decContextSaveStatus(decContext *, uint32_t); |
| extern decContext * decContextSetRounding(decContext *, enum rounding); |
| extern decContext * decContextSetStatus(decContext *, uint32_t); |
| extern decContext * decContextSetStatusFromString(decContext *, const char *); |
| extern decContext * decContextSetStatusFromStringQuiet(decContext *, const char *); |
| extern decContext * decContextSetStatusQuiet(decContext *, uint32_t); |
| extern const char * decContextStatusToString(const decContext *); |
| extern uint32_t decContextTestSavedStatus(uint32_t, uint32_t); |
| extern uint32_t decContextTestStatus(decContext *, uint32_t); |
| extern decContext * decContextZeroStatus(decContext *); |
| |
| #endif |
