[deliverable/binutils-gdb.git] / libdecnumber / decContext.h

/* 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 */

  #if !defined(int32_t)
    #include <stdint.h> 	   /* C99 standard integers	      */
  #endif
  #include <stdio.h>		   /* for printf, etc.		      */
  #include <signal.h>		   /* for traps 		      */

  /* Extended flags setting -- set this to 0 to use only IEEE flags   */
  #if !defined(DECEXTFLAG)
  #define DECEXTFLAG 1		   /* 1=enable extended flags	      */
  #endif

  /* Conditional code flag -- set this to 0 for best performance      */
  #if !defined(DECSUBSET)
  #define DECSUBSET  0		   /* 1=enable subset arithmetic      */
  #endif

  /* 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 754 (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 754 groupings for the flags				      */
  /* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal    */
  /* are not in IEEE 754]					      */
  #define DEC_IEEE_754_Division_by_zero  (DEC_Division_by_zero)
  #if DECSUBSET
  #define DEC_IEEE_754_Inexact		 (DEC_Inexact | DEC_Lost_digits)
  #else
  #define DEC_IEEE_754_Inexact		 (DEC_Inexact)
  #endif
  #define DEC_IEEE_754_Invalid_operation (DEC_Conversion_syntax |     \
					  DEC_Division_impossible |   \
					  DEC_Division_undefined |    \
					  DEC_Insufficient_storage |  \
					  DEC_Invalid_context |       \
					  DEC_Invalid_operation)
  #define DEC_IEEE_754_Overflow 	 (DEC_Overflow)
  #define DEC_IEEE_754_Underflow	 (DEC_Underflow)

  /* flags which are normally errors (result is qNaN, infinite, or 0) */
  #define DEC_Errors (DEC_IEEE_754_Division_by_zero |		      \
		      DEC_IEEE_754_Invalid_operation |		      \
		      DEC_IEEE_754_Overflow | DEC_IEEE_754_Underflow)
  /* flags which cause a result to become qNaN			      */
  #define DEC_NaNs    DEC_IEEE_754_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

  /* IEEE 854 names (for compatibility with older decNumber versions) */
  #define DEC_IEEE_854_Division_by_zero  DEC_IEEE_754_Division_by_zero
  #define DEC_IEEE_854_Inexact		 DEC_IEEE_754_Inexact
  #define DEC_IEEE_854_Invalid_operation DEC_IEEE_754_Invalid_operation
  #define DEC_IEEE_854_Overflow 	 DEC_IEEE_754_Overflow
  #define DEC_IEEE_854_Underflow	 DEC_IEEE_754_Underflow

  /* 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					      */

  #include "decContextSymbols.h"

  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 int32_t       decContextTestEndian(uint8_t);
  extern uint32_t      decContextTestSavedStatus(uint32_t, uint32_t);
  extern uint32_t      decContextTestStatus(decContext *, uint32_t);
  extern decContext  * decContextZeroStatus(decContext *);

#endif
Commit	Line	Data
f5bc1778 DJ	1	/* Decimal context header module for the decNumber C Library.
	2	Copyright (C) 2005, 2007 Free Software Foundation, Inc.
	3	Contributed by IBM Corporation. Author Mike Cowlishaw.
	4
	5	This file is part of GCC.
	6
	7	GCC is free software; you can redistribute it and/or modify it under
	8	the terms of the GNU General Public License as published by the Free
	9	Software Foundation; either version 2, or (at your option) any later
	10	version.
	11
	12	In addition to the permissions in the GNU General Public License,
	13	the Free Software Foundation gives you unlimited permission to link
	14	the compiled version of this file into combinations with other
	15	programs, and to distribute those combinations without any
	16	restriction coming from the use of this file. (The General Public
	17	License restrictions do apply in other respects; for example, they
	18	cover modification of the file, and distribution when not linked
	19	into a combine executable.)
	20
	21	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
	22	WARRANTY; without even the implied warranty of MERCHANTABILITY or
	23	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	24	for more details.
	25
	26	You should have received a copy of the GNU General Public License
	27	along with GCC; see the file COPYING. If not, write to the Free
	28	Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
	29	02110-1301, USA. */
	30
	31	/* ------------------------------------------------------------------ */
	32	/* Decimal Context module header */
	33	/* ------------------------------------------------------------------ */
	34	/* */
	35	/* Context variables must always have valid values: */
	36	/* */
87d32bb7	37	/* status -- [any bits may be cleared, but not set, by user] */
f5bc1778 DJ	38	/* round -- must be one of the enumerated rounding modes */
	39	/* */
	40	/* The following variables are implied for fixed size formats (i.e., */
	41	/* they are ignored) but should still be set correctly in case used */
	42	/* with decNumber functions: */
	43	/* */
	44	/* clamp -- must be either 0 or 1 */
	45	/* digits -- must be in the range 1 through 999999999 */
	46	/* emax -- must be in the range 0 through 999999999 */
	47	/* emin -- must be in the range 0 through -999999999 */
	48	/* extended -- must be either 0 or 1 [present only if DECSUBSET] */
	49	/* traps -- only defined bits may be set */
	50	/* */
	51	/* ------------------------------------------------------------------ */
	52
	53	#if !defined(DECCONTEXT)
	54	#define DECCONTEXT
	55	#define DECCNAME "decContext" /* Short name */
	56	#define DECCFULLNAME "Decimal Context Descriptor" /* Verbose name */
87d32bb7	57	#define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */
f5bc1778	58
87d32bb7 DD	59	#if !defined(int32_t)
	60	#include <stdint.h> /* C99 standard integers */
	61	#endif
f5bc1778	62	#include <stdio.h> /* for printf, etc. */
87d32bb7	63	#include <signal.h> /* for traps */
f5bc1778 DJ	64
f5bc1778 DJ	65	/* Extended flags setting -- set this to 0 to use only IEEE flags */
87d32bb7	66	#if !defined(DECEXTFLAG)
f5bc1778	67	#define DECEXTFLAG 1 /* 1=enable extended flags */
87d32bb7	68	#endif
f5bc1778 DJ	69
f5bc1778 DJ	70	/* Conditional code flag -- set this to 0 for best performance */
87d32bb7	71	#if !defined(DECSUBSET)
f5bc1778	72	#define DECSUBSET 0 /* 1=enable subset arithmetic */
87d32bb7	73	#endif
f5bc1778 DJ	74
	75	/* Context for operations, with associated constants */
	76	enum rounding {
	77	DEC_ROUND_CEILING, /* round towards +infinity */
87d32bb7	78	DEC_ROUND_UP, /* round away from 0 */
f5bc1778 DJ	79	DEC_ROUND_HALF_UP, /* 0.5 rounds up */
	80	DEC_ROUND_HALF_EVEN, /* 0.5 rounds to nearest even */
	81	DEC_ROUND_HALF_DOWN, /* 0.5 rounds down */
	82	DEC_ROUND_DOWN, /* round towards 0 (truncate) */
	83	DEC_ROUND_FLOOR, /* round towards -infinity */
87d32bb7	84	DEC_ROUND_05UP, /* round for reround */
f5bc1778 DJ	85	DEC_ROUND_MAX /* enum must be less than this */
	86	};
	87	#define DEC_ROUND_DEFAULT DEC_ROUND_HALF_EVEN;
	88
	89	typedef struct {
87d32bb7 DD	90	int32_t digits; /* working precision */
	91	int32_t emax; /* maximum positive exponent */
	92	int32_t emin; /* minimum negative exponent */
f5bc1778 DJ	93	enum rounding round; /* rounding mode */
	94	uint32_t traps; /* trap-enabler flags */
	95	uint32_t status; /* status flags */
	96	uint8_t clamp; /* flag: apply IEEE exponent clamp */
	97	#if DECSUBSET
	98	uint8_t extended; /* flag: special-values allowed */
	99	#endif
	100	} decContext;
	101
	102	/* Maxima and Minima for context settings */
	103	#define DEC_MAX_DIGITS 999999999
	104	#define DEC_MIN_DIGITS 1
	105	#define DEC_MAX_EMAX 999999999
	106	#define DEC_MIN_EMAX 0
	107	#define DEC_MAX_EMIN 0
	108	#define DEC_MIN_EMIN -999999999
	109	#define DEC_MAX_MATH 999999 /* max emax, etc., for math funcs. */
	110
87d32bb7 DD	111	/* Classifications for decimal numbers, aligned with 754 (note that */
	112	/* 'normal' and 'subnormal' are meaningful only with a decContext */
	113	/* or a fixed size format). */
f5bc1778 DJ	114	enum decClass {
	115	DEC_CLASS_SNAN,
	116	DEC_CLASS_QNAN,
	117	DEC_CLASS_NEG_INF,
	118	DEC_CLASS_NEG_NORMAL,
	119	DEC_CLASS_NEG_SUBNORMAL,
	120	DEC_CLASS_NEG_ZERO,
	121	DEC_CLASS_POS_ZERO,
	122	DEC_CLASS_POS_SUBNORMAL,
	123	DEC_CLASS_POS_NORMAL,
	124	DEC_CLASS_POS_INF
	125	};
	126	/* Strings for the decClasses */
	127	#define DEC_ClassString_SN "sNaN"
	128	#define DEC_ClassString_QN "NaN"
	129	#define DEC_ClassString_NI "-Infinity"
	130	#define DEC_ClassString_NN "-Normal"
	131	#define DEC_ClassString_NS "-Subnormal"
	132	#define DEC_ClassString_NZ "-Zero"
	133	#define DEC_ClassString_PZ "+Zero"
	134	#define DEC_ClassString_PS "+Subnormal"
	135	#define DEC_ClassString_PN "+Normal"
	136	#define DEC_ClassString_PI "+Infinity"
	137	#define DEC_ClassString_UN "Invalid"
	138
	139	/* Trap-enabler and Status flags (exceptional conditions), and */
	140	/* their names. The top byte is reserved for internal use */
	141	#if DECEXTFLAG
	142	/* Extended flags */
	143	#define DEC_Conversion_syntax 0x00000001
	144	#define DEC_Division_by_zero 0x00000002
	145	#define DEC_Division_impossible 0x00000004
	146	#define DEC_Division_undefined 0x00000008
	147	#define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */
87d32bb7 DD	148	#define DEC_Inexact 0x00000020
87d32bb7 DD	149	#define DEC_Invalid_context 0x00000040
f5bc1778 DJ	150	#define DEC_Invalid_operation 0x00000080
	151	#if DECSUBSET
	152	#define DEC_Lost_digits 0x00000100
	153	#endif
	154	#define DEC_Overflow 0x00000200
87d32bb7 DD	155	#define DEC_Clamped 0x00000400
87d32bb7 DD	156	#define DEC_Rounded 0x00000800
f5bc1778 DJ	157	#define DEC_Subnormal 0x00001000
	158	#define DEC_Underflow 0x00002000
	159	#else
	160	/* IEEE flags only */
	161	#define DEC_Conversion_syntax 0x00000010
	162	#define DEC_Division_by_zero 0x00000002
	163	#define DEC_Division_impossible 0x00000010
	164	#define DEC_Division_undefined 0x00000010
	165	#define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */
87d32bb7 DD	166	#define DEC_Inexact 0x00000001
87d32bb7 DD	167	#define DEC_Invalid_context 0x00000010
f5bc1778 DJ	168	#define DEC_Invalid_operation 0x00000010
	169	#if DECSUBSET
	170	#define DEC_Lost_digits 0x00000000
	171	#endif
	172	#define DEC_Overflow 0x00000008
87d32bb7 DD	173	#define DEC_Clamped 0x00000000
87d32bb7 DD	174	#define DEC_Rounded 0x00000000
f5bc1778 DJ	175	#define DEC_Subnormal 0x00000000
	176	#define DEC_Underflow 0x00000004
	177	#endif
	178
87d32bb7	179	/* IEEE 754 groupings for the flags */
f5bc1778	180	/* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal */
87d32bb7 DD	181	/* are not in IEEE 754] */
87d32bb7 DD	182	#define DEC_IEEE_754_Division_by_zero (DEC_Division_by_zero)
f5bc1778	183	#if DECSUBSET
87d32bb7	184	#define DEC_IEEE_754_Inexact (DEC_Inexact \| DEC_Lost_digits)
f5bc1778	185	#else
87d32bb7	186	#define DEC_IEEE_754_Inexact (DEC_Inexact)
f5bc1778	187	#endif
87d32bb7	188	#define DEC_IEEE_754_Invalid_operation (DEC_Conversion_syntax \| \
f5bc1778 DJ	189	DEC_Division_impossible \| \
	190	DEC_Division_undefined \| \
	191	DEC_Insufficient_storage \| \
87d32bb7	192	DEC_Invalid_context \| \
f5bc1778	193	DEC_Invalid_operation)
87d32bb7 DD	194	#define DEC_IEEE_754_Overflow (DEC_Overflow)
87d32bb7 DD	195	#define DEC_IEEE_754_Underflow (DEC_Underflow)
f5bc1778 DJ	196
f5bc1778 DJ	197	/* flags which are normally errors (result is qNaN, infinite, or 0) */
87d32bb7 DD	198	#define DEC_Errors (DEC_IEEE_754_Division_by_zero \| \
	199	DEC_IEEE_754_Invalid_operation \| \
	200	DEC_IEEE_754_Overflow \| DEC_IEEE_754_Underflow)
f5bc1778	201	/* flags which cause a result to become qNaN */
87d32bb7	202	#define DEC_NaNs DEC_IEEE_754_Invalid_operation
f5bc1778 DJ	203
	204	/* flags which are normally for information only (finite results) */
	205	#if DECSUBSET
	206	#define DEC_Information (DEC_Clamped \| DEC_Rounded \| DEC_Inexact \
	207	\| DEC_Lost_digits)
	208	#else
	209	#define DEC_Information (DEC_Clamped \| DEC_Rounded \| DEC_Inexact)
	210	#endif
	211
87d32bb7 DD	212	/* IEEE 854 names (for compatibility with older decNumber versions) */
	213	#define DEC_IEEE_854_Division_by_zero DEC_IEEE_754_Division_by_zero
	214	#define DEC_IEEE_854_Inexact DEC_IEEE_754_Inexact
	215	#define DEC_IEEE_854_Invalid_operation DEC_IEEE_754_Invalid_operation
	216	#define DEC_IEEE_854_Overflow DEC_IEEE_754_Overflow
	217	#define DEC_IEEE_854_Underflow DEC_IEEE_754_Underflow
	218
f5bc1778 DJ	219	/* Name strings for the exceptional conditions */
	220	#define DEC_Condition_CS "Conversion syntax"
	221	#define DEC_Condition_DZ "Division by zero"
	222	#define DEC_Condition_DI "Division impossible"
	223	#define DEC_Condition_DU "Division undefined"
	224	#define DEC_Condition_IE "Inexact"
	225	#define DEC_Condition_IS "Insufficient storage"
	226	#define DEC_Condition_IC "Invalid context"
	227	#define DEC_Condition_IO "Invalid operation"
	228	#if DECSUBSET
	229	#define DEC_Condition_LD "Lost digits"
	230	#endif
	231	#define DEC_Condition_OV "Overflow"
	232	#define DEC_Condition_PA "Clamped"
	233	#define DEC_Condition_RO "Rounded"
	234	#define DEC_Condition_SU "Subnormal"
	235	#define DEC_Condition_UN "Underflow"
	236	#define DEC_Condition_ZE "No status"
	237	#define DEC_Condition_MU "Multiple status"
	238	#define DEC_Condition_Length 21 /* length of the longest string, */
	239	/* including terminator */
	240
	241	/* Initialization descriptors, used by decContextDefault */
87d32bb7	242	#define DEC_INIT_BASE 0
f5bc1778 DJ	243	#define DEC_INIT_DECIMAL32 32
	244	#define DEC_INIT_DECIMAL64 64
	245	#define DEC_INIT_DECIMAL128 128
	246	/* Synonyms */
	247	#define DEC_INIT_DECSINGLE DEC_INIT_DECIMAL32
	248	#define DEC_INIT_DECDOUBLE DEC_INIT_DECIMAL64
	249	#define DEC_INIT_DECQUAD DEC_INIT_DECIMAL128
	250
	251	/* decContext routines */
	252
	253	#include "decContextSymbols.h"
	254
	255	extern decContext * decContextClearStatus(decContext *, uint32_t);
	256	extern decContext * decContextDefault(decContext *, int32_t);
	257	extern enum rounding decContextGetRounding(decContext *);
	258	extern uint32_t decContextGetStatus(decContext *);
	259	extern decContext * decContextRestoreStatus(decContext *, uint32_t, uint32_t);
	260	extern uint32_t decContextSaveStatus(decContext *, uint32_t);
	261	extern decContext * decContextSetRounding(decContext *, enum rounding);
	262	extern decContext * decContextSetStatus(decContext *, uint32_t);
	263	extern decContext * decContextSetStatusFromString(decContext , const char );
	264	extern decContext * decContextSetStatusFromStringQuiet(decContext , const char );
	265	extern decContext * decContextSetStatusQuiet(decContext *, uint32_t);
	266	extern const char * decContextStatusToString(const decContext *);
87d32bb7	267	extern int32_t decContextTestEndian(uint8_t);
f5bc1778 DJ	268	extern uint32_t decContextTestSavedStatus(uint32_t, uint32_t);
	269	extern uint32_t decContextTestStatus(decContext *, uint32_t);
	270	extern decContext * decContextZeroStatus(decContext *);
	271
	272	#endif