2014-04-21 15:54:45 -05:00
|
|
|
/* 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 */
|
|
|
|
|
/* */
|
|
|
|
|
/* ------------------------------------------------------------------ */
|
|
|
|
|
|
2016-06-29 13:47:03 +02:00
|
|
|
#ifndef DECCONTEXT_H
|
|
|
|
|
#define DECCONTEXT_H
|
|
|
|
|
|
2014-04-21 15:54:45 -05:00
|
|
|
#define DECCNAME "decContext" /* Short name */
|
|
|
|
|
#define DECCFULLNAME "Decimal Context Descriptor" /* Verbose name */
|
|
|
|
|
#define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 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
|
