path: root/arch/parisc/math-emu/float.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
 *
 * Floating-point emulation code
 *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
 */
/*
 * BEGIN_DESC
 * 
 *  File: 
 *      @(#)	pa/spmath/float.h		$Revision: 1.1 $
 * 
 *  Purpose:
 *      <<please update with a synopis of the functionality provided by this file>>
 * 
 *  BE header:  no
 *
 *  Shipped:  yes
 *	/usr/conf/pa/spmath/float.h
 *
 * END_DESC  
*/

#ifdef __NO_PA_HDRS
    PA header file -- do not include this header file for non-PA builds.
#endif

#include "fpbits.h"
#include "hppa.h"
/*
 * Want to pick up the FPU capability flags, not the PDC structures.
 * 'LOCORE' isn't really true in this case, but we don't want the C structures
 * so it suits our purposes
 */
#define LOCORE
#include "fpu.h"

/*
 * Declare the basic structures for the 3 different
 * floating-point precisions.
 *        
 * Single number  
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |s|       exp     |               mantissa                      |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
#define	Sall(object) (object)
#define	Ssign(object) Bitfield_extract( 0,  1,object)
#define	Ssignedsign(object) Bitfield_signed_extract( 0,  1,object)
#define	Sexponent(object) Bitfield_extract( 1,  8,object)
#define	Smantissa(object) Bitfield_mask( 9, 23,object)
#define	Ssignaling(object) Bitfield_extract( 9,  1,object)
#define	Ssignalingnan(object) Bitfield_extract( 1,  9,object)
#define	Shigh2mantissa(object) Bitfield_extract( 9,  2,object)
#define	Sexponentmantissa(object) Bitfield_mask( 1, 31,object)
#define	Ssignexponent(object) Bitfield_extract( 0,  9,object)
#define	Shidden(object) Bitfield_extract( 8,  1,object)
#define	Shiddenoverflow(object) Bitfield_extract( 7,  1,object)
#define	Shiddenhigh7mantissa(object) Bitfield_extract( 8,  8,object)
#define	Shiddenhigh3mantissa(object) Bitfield_extract( 8,  4,object)
#define	Slow(object) Bitfield_mask( 31,  1,object)
#define	Slow4(object) Bitfield_mask( 28,  4,object)
#define	Slow31(object) Bitfield_mask( 1, 31,object)
#define	Shigh31(object) Bitfield_extract( 0, 31,object)
#define	Ssignedhigh31(object) Bitfield_signed_extract( 0, 31,object)
#define	Shigh4(object) Bitfield_extract( 0,  4,object)
#define	Sbit24(object) Bitfield_extract( 24,  1,object)
#define	Sbit28(object) Bitfield_extract( 28,  1,object)
#define	Sbit29(object) Bitfield_extract( 29,  1,object)
#define	Sbit30(object) Bitfield_extract( 30,  1,object)
#define	Sbit31(object) Bitfield_mask( 31,  1,object)

#define Deposit_ssign(object,value) Bitfield_deposit(value,0,1,object)
#define Deposit_sexponent(object,value) Bitfield_deposit(value,1,8,object)
#define Deposit_smantissa(object,value) Bitfield_deposit(value,9,23,object)
#define Deposit_shigh2mantissa(object,value) Bitfield_deposit(value,9,2,object)
#define Deposit_sexponentmantissa(object,value) \
    Bitfield_deposit(value,1,31,object)
#define Deposit_ssignexponent(object,value) Bitfield_deposit(value,0,9,object)
#define Deposit_slow(object,value) Bitfield_deposit(value,31,1,object)
#define Deposit_shigh4(object,value) Bitfield_deposit(value,0,4,object)

#define	Is_ssign(object) Bitfield_mask( 0,  1,object)
#define	Is_ssignaling(object) Bitfield_mask( 9,  1,object)
#define	Is_shidden(object) Bitfield_mask( 8,  1,object)
#define	Is_shiddenoverflow(object) Bitfield_mask( 7,  1,object)
#define	Is_slow(object) Bitfield_mask( 31,  1,object)
#define	Is_sbit24(object) Bitfield_mask( 24,  1,object)
#define	Is_sbit28(object) Bitfield_mask( 28,  1,object)
#define	Is_sbit29(object) Bitfield_mask( 29,  1,object)
#define	Is_sbit30(object) Bitfield_mask( 30,  1,object)
#define	Is_sbit31(object) Bitfield_mask( 31,  1,object)

/* 
 * Double number.
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |s|       exponent      |          mantissa part 1              |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                    mantissa part 2                            |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
#define Dallp1(object) (object)
#define Dsign(object) Bitfield_extract( 0,  1,object)
#define Dsignedsign(object) Bitfield_signed_extract( 0,  1,object)
#define Dexponent(object) Bitfield_extract( 1,  11,object)
#define Dmantissap1(object) Bitfield_mask( 12, 20,object)
#define Dsignaling(object) Bitfield_extract( 12,  1,object)
#define Dsignalingnan(object) Bitfield_extract( 1,  12,object)
#define Dhigh2mantissa(object) Bitfield_extract( 12,  2,object)
#define Dexponentmantissap1(object) Bitfield_mask( 1, 31,object)
#define Dsignexponent(object) Bitfield_extract( 0, 12,object)
#define Dhidden(object) Bitfield_extract( 11,  1,object)
#define Dhiddenoverflow(object) Bitfield_extract( 10,  1,object)
#define Dhiddenhigh7mantissa(object) Bitfield_extract( 11,  8,object)
#define Dhiddenhigh3mantissa(object) Bitfield_extract( 11,  4,object)
#define Dlowp1(object) Bitfield_mask( 31,  1,object)
#define Dlow31p1(object) Bitfield_mask( 1, 31,object)
#define Dhighp1(object) Bitfield_extract( 0,  1,object)
#define Dhigh4p1(object) Bitfield_extract( 0,  4,object)
#define Dhigh31p1(object) Bitfield_extract( 0, 31,object)
#define Dsignedhigh31p1(object) Bitfield_signed_extract( 0, 31,object)
#define Dbit3p1(object) Bitfield_extract( 3,  1,object)

#define Deposit_dsign(object,value) Bitfield_deposit(value,0,1,object)
#define Deposit_dexponent(object,value) Bitfield_deposit(value,1,11,object)
#define Deposit_dmantissap1(object,value) Bitfield_deposit(value,12,20,object)
#define Deposit_dhigh2mantissa(object,value) Bitfield_deposit(value,12,2,object)
#define Deposit_dexponentmantissap1(object,value) \
    Bitfield_deposit(value,1,31,object)
#define Deposit_dsignexponent(object,value) Bitfield_deposit(value,0,12,object)
#define Deposit_dlowp1(object,value) Bitfield_deposit(value,31,1,object)
#define Deposit_dhigh4p1(object,value) Bitfield_deposit(value,0,4,object)

#define Is_dsign(object) Bitfield_mask( 0,  1,object)
#define Is_dsignaling(object) Bitfield_mask( 12,  1,object)
#define Is_dhidden(object) Bitfield_mask( 11,  1,object)
#define Is_dhiddenoverflow(object) Bitfield_mask( 10,  1,object)
#define Is_dlowp1(object) Bitfield_mask( 31,  1,object)
#define Is_dhighp1(object) Bitfield_mask( 0,  1,object)
#define Is_dbit3p1(object) Bitfield_mask( 3,  1,object)

#define Dallp2(object) (object)
#define Dmantissap2(object) (object)
#define Dlowp2(object) Bitfield_mask( 31,  1,object)
#define Dlow4p2(object) Bitfield_mask( 28,  4,object)
#define Dlow31p2(object) Bitfield_mask( 1, 31,object)
#define Dhighp2(object) Bitfield_extract( 0,  1,object)
#define Dhigh31p2(object) Bitfield_extract( 0, 31,object)
#define Dbit2p2(object) Bitfield_extract( 2,  1,object)
#define Dbit3p2(object) Bitfield_extract( 3,  1,object)
#define Dbit21p2(object) Bitfield_extract( 21,  1,object)
#define Dbit28p2(object) Bitfield_extract( 28,  1,object)
#define Dbit29p2(object) Bitfield_extract( 29,  1,object)
#define Dbit30p2(object) Bitfield_extract( 30,  1,object)
#define Dbit31p2(object) Bitfield_mask( 31,  1,object)

#define Deposit_dlowp2(object,value) Bitfield_deposit(value,31,1,object)

#define Is_dlowp2(object) Bitfield_mask( 31,  1,object)
#define Is_dhighp2(object) Bitfield_mask( 0,  1,object)
#define Is_dbit2p2(object) Bitfield_mask( 2,  1,object)
#define Is_dbit3p2(object) Bitfield_mask( 3,  1,object)
#define Is_dbit21p2(object) Bitfield_mask( 21,  1,object)
#define Is_dbit28p2(object) Bitfield_mask( 28,  1,object)
#define Is_dbit29p2(object) Bitfield_mask( 29,  1,object)
#define Is_dbit30p2(object) Bitfield_mask( 30,  1,object)
#define Is_dbit31p2(object) Bitfield_mask( 31,  1,object)

/* 
 * Quad number.
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |s|          exponent           |      mantissa part 1          |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                    mantissa part 2                            |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                    mantissa part 3                            |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                    mantissa part 4                            |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
typedef struct
    {
    union
	{
	struct { unsigned qallp1; } u_qallp1;
/* Not needed for now...
	Bitfield_extract( 0,  1,u_qsign,qsign)
	Bitfield_signed_extract( 0,  1,u_qsignedsign,qsignedsign)
	Bitfield_extract( 1, 15,u_qexponent,qexponent)
	Bitfield_extract(16, 16,u_qmantissap1,qmantissap1)
	Bitfield_extract(16,  1,u_qsignaling,qsignaling)
	Bitfield_extract(1,  16,u_qsignalingnan,qsignalingnan)
	Bitfield_extract(16,  2,u_qhigh2mantissa,qhigh2mantissa)
	Bitfield_extract( 1, 31,u_qexponentmantissap1,qexponentmantissap1)
	Bitfield_extract( 0, 16,u_qsignexponent,qsignexponent)
	Bitfield_extract(15,  1,u_qhidden,qhidden)
	Bitfield_extract(14,  1,u_qhiddenoverflow,qhiddenoverflow)
	Bitfield_extract(15,  8,u_qhiddenhigh7mantissa,qhiddenhigh7mantissa)
	Bitfield_extract(15,  4,u_qhiddenhigh3mantissa,qhiddenhigh3mantissa)
	Bitfield_extract(31,  1,u_qlowp1,qlowp1)
	Bitfield_extract( 1, 31,u_qlow31p1,qlow31p1)
	Bitfield_extract( 0,  1,u_qhighp1,qhighp1)
	Bitfield_extract( 0,  4,u_qhigh4p1,qhigh4p1)
	Bitfield_extract( 0, 31,u_qhigh31p1,qhigh31p1)
  */
	} quad_u1;
    union
	{
	struct { unsigned qallp2; } u_qallp2;
  /* Not needed for now...
	Bitfield_extract(31,  1,u_qlowp2,qlowp2)
	Bitfield_extract( 1, 31,u_qlow31p2,qlow31p2)
	Bitfield_extract( 0,  1,u_qhighp2,qhighp2)
	Bitfield_extract( 0, 31,u_qhigh31p2,qhigh31p2)
   */
	} quad_u2;
    union
	{
	struct { unsigned qallp3; } u_qallp3;
  /* Not needed for now...
	Bitfield_extract(31,  1,u_qlowp3,qlowp3)
	Bitfield_extract( 1, 31,u_qlow31p3,qlow31p3)
	Bitfield_extract( 0,  1,u_qhighp3,qhighp3)
	Bitfield_extract( 0, 31,u_qhigh31p3,qhigh31p3)
   */ 
	} quad_u3;
    union
	{
	struct { unsigned qallp4; } u_qallp4;
    /* Not need for now...
	Bitfield_extract(31,  1,u_qlowp4,qlowp4)
	Bitfield_extract( 1, 31,u_qlow31p4,qlow31p4)
	Bitfield_extract( 0,  1,u_qhighp4,qhighp4)
	Bitfield_extract( 0, 31,u_qhigh31p4,qhigh31p4)
     */
	} quad_u4;
    } quad_floating_point;

/* Extension - An additional structure to hold the guard, round and
 *             sticky bits during computations.
 */
#define Extall(object) (object)
#define Extsign(object) Bitfield_extract( 0,  1,object)
#define Exthigh31(object) Bitfield_extract( 0, 31,object)
#define Extlow31(object) Bitfield_extract( 1, 31,object)
#define Extlow(object) Bitfield_extract( 31,  1,object)

/*
 * Single extended - The upper word is just like single precision,
 *                 but one additional word of mantissa is needed.
 */
#define Sextallp1(object) (object)
#define Sextallp2(object) (object)
#define Sextlowp1(object) Bitfield_extract( 31,  1,object)
#define Sexthighp2(object) Bitfield_extract( 0,  1,object)
#define Sextlow31p2(object) Bitfield_extract( 1, 31,object)
#define Sexthiddenoverflow(object) Bitfield_extract( 4,  1,object)
#define Is_sexthiddenoverflow(object) Bitfield_mask( 4,  1,object)

/*
 * Double extended - The upper two words are just like double precision,
 *		     but two additional words of mantissa are needed.
 */
#define Dextallp1(object) (object)
#define Dextallp2(object) (object)
#define Dextallp3(object) (object)
#define Dextallp4(object) (object)
#define Dextlowp2(object) Bitfield_extract( 31,  1,object)
#define Dexthighp3(object) Bitfield_extract( 0,  1,object)
#define Dextlow31p3(object) Bitfield_extract( 1, 31,object)
#define Dexthiddenoverflow(object) Bitfield_extract( 10,  1,object)
#define Is_dexthiddenoverflow(object) Bitfield_mask( 10,  1,object)
#define Deposit_dextlowp4(object,value) Bitfield_deposit(value,31,1,object)

/*
 * Declare the basic structures for the 3 different
 * fixed-point precisions.
 *        
 * Single number  
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |s|                    integer                                  |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
typedef int sgl_integer;

/* 
 * Double number.
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |s|                     high integer                            |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                       low integer                             |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
struct dint {
        int  wd0;
        unsigned int wd1;
};

struct dblwd {
        unsigned int wd0;
        unsigned int wd1;
};

/* 
 * Quad number.
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |s|                  integer part1                              |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                    integer part 2                             |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                    integer part 3                             |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                    integer part 4                             |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */

struct quadwd {
        int  wd0;
        unsigned int wd1;
        unsigned int wd2;
        unsigned int wd3;
};

typedef struct quadwd quad_integer;


/* useful typedefs */
typedef unsigned int sgl_floating_point;
typedef struct dblwd dbl_floating_point;
typedef struct dint dbl_integer;
typedef struct dblwd dbl_unsigned;

/* 
 * Define the different precisions' parameters.
 */
#define SGL_BITLENGTH 32
#define SGL_EMAX 127
#define SGL_EMIN (-126)
#define SGL_BIAS 127
#define SGL_WRAP 192
#define SGL_INFINITY_EXPONENT (SGL_EMAX+SGL_BIAS+1)
#define SGL_THRESHOLD 32
#define SGL_EXP_LENGTH 8
#define SGL_P 24

#define DBL_BITLENGTH 64
#define DBL_EMAX 1023
#define DBL_EMIN (-1022)
#define DBL_BIAS 1023
#define DBL_WRAP 1536
#define DBL_INFINITY_EXPONENT (DBL_EMAX+DBL_BIAS+1)
#define DBL_THRESHOLD 64
#define DBL_EXP_LENGTH 11
#define DBL_P 53

#define QUAD_BITLENGTH 128
#define QUAD_EMAX 16383
#define QUAD_EMIN (-16382)
#define QUAD_BIAS 16383
#define QUAD_WRAP 24576
#define QUAD_INFINITY_EXPONENT (QUAD_EMAX+QUAD_BIAS+1)
#define QUAD_P 113

/* Boolean Values etc. */
#define FALSE 0
#define TRUE (!FALSE)
#define NOT !
#define XOR ^

/* other constants */
#undef NULL
#define NULL 0
#define NIL 0
#define SGL 0
#define DBL 1
#define BADFMT 2
#define QUAD 3


/* Types */
typedef int boolean;
typedef int FORMAT;
typedef int VOID;


/* Declare status register equivalent to FPUs architecture.
 *
 *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |V|Z|O|U|I|C|  rsv  |  model    | version |RM |rsv|T|r|V|Z|O|U|I|
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
#define Cbit(object) Bitfield_extract( 5, 1,object)
#define Tbit(object) Bitfield_extract( 25, 1,object)
#define Roundingmode(object) Bitfield_extract( 21, 2,object)
#define Invalidtrap(object) Bitfield_extract( 27, 1,object)
#define Divisionbyzerotrap(object) Bitfield_extract( 28, 1,object)
#define Overflowtrap(object) Bitfield_extract( 29, 1,object)
#define Underflowtrap(object) Bitfield_extract( 30, 1,object)
#define Inexacttrap(object) Bitfield_extract( 31, 1,object)
#define Invalidflag(object) Bitfield_extract( 0, 1,object)
#define Divisionbyzeroflag(object) Bitfield_extract( 1, 1,object)
#define Overflowflag(object) Bitfield_extract( 2, 1,object)
#define Underflowflag(object) Bitfield_extract( 3, 1,object)
#define Inexactflag(object) Bitfield_extract( 4, 1,object)
#define Allflags(object) Bitfield_extract( 0, 5,object)

/* Definitions relevant to the status register */

/* Rounding Modes */
#define ROUNDNEAREST 0
#define ROUNDZERO    1
#define ROUNDPLUS    2
#define ROUNDMINUS   3

/* Exceptions */
#define NOEXCEPTION		0x0
#define INVALIDEXCEPTION	0x20
#define DIVISIONBYZEROEXCEPTION	0x10
#define OVERFLOWEXCEPTION	0x08
#define UNDERFLOWEXCEPTION	0x04
#define INEXACTEXCEPTION	0x02
#define UNIMPLEMENTEDEXCEPTION	0x01

/* New exceptions for the 2E Opcode */
#define OPC_2E_INVALIDEXCEPTION     0x30
#define OPC_2E_OVERFLOWEXCEPTION    0x18
#define OPC_2E_UNDERFLOWEXCEPTION   0x0c
#define OPC_2E_INEXACTEXCEPTION     0x12

/* Declare exception registers equivalent to FPUs architecture 
 *
 *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |excepttype |  r1     | r2/ext  |  operation  |parm |n| t/cond  |
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
#define Allexception(object) (object)
#define Exceptiontype(object) Bitfield_extract( 0, 6,object)
#define Instructionfield(object) Bitfield_mask( 6,26,object)
#define Parmfield(object) Bitfield_extract( 23, 3,object)
#define Rabit(object) Bitfield_extract( 24, 1,object)
#define Ibit(object) Bitfield_extract( 25, 1,object)

#define Set_exceptiontype(object,value) Bitfield_deposit(value, 0, 6,object)
#define Set_parmfield(object,value) Bitfield_deposit(value, 23, 3,object)
#define Set_exceptiontype_and_instr_field(exception,instruction,object) \
    object = exception << 26 | instruction

/* Declare the condition field
 *
 *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 * |                                                     |G|L|E|U|X|
 * +-------+-------+-------+-------+-------+-------+-------+-------+
 */
#define Greaterthanbit(object) Bitfield_extract( 27, 1,object)
#define Lessthanbit(object) Bitfield_extract( 28, 1,object)
#define Equalbit(object) Bitfield_extract( 29, 1,object)
#define Unorderedbit(object) Bitfield_extract( 30, 1,object)
#define Exceptionbit(object) Bitfield_extract( 31, 1,object)

/* An alias name for the status register */
#define Fpustatus_register (*status)

/**************************************************
 * Status register referencing and manipulation.  *
 **************************************************/

/* Rounding mode */
#define Rounding_mode()  Roundingmode(Fpustatus_register)
#define Is_rounding_mode(rmode) \
    (Roundingmode(Fpustatus_register) == rmode)
#define Set_rounding_mode(value) \
    Bitfield_deposit(value,21,2,Fpustatus_register)

/* Boolean testing of the trap enable bits */
#define Is_invalidtrap_enabled() Invalidtrap(Fpustatus_register)
#define Is_divisionbyzerotrap_enabled() Divisionbyzerotrap(Fpustatus_register)
#define Is_overflowtrap_enabled() Overflowtrap(Fpustatus_register)
#define Is_underflowtrap_enabled() Underflowtrap(Fpustatus_register)
#define Is_inexacttrap_enabled() Inexacttrap(Fpustatus_register)

/* Set the indicated flags in the status register */
#define Set_invalidflag() Bitfield_deposit(1,0,1,Fpustatus_register)
#define Set_divisionbyzeroflag() Bitfield_deposit(1,1,1,Fpustatus_register)
#define Set_overflowflag() Bitfield_deposit(1,2,1,Fpustatus_register)
#define Set_underflowflag() Bitfield_deposit(1,3,1,Fpustatus_register)
#define Set_inexactflag() Bitfield_deposit(1,4,1,Fpustatus_register)

#define Clear_all_flags() Bitfield_deposit(0,0,5,Fpustatus_register)

/* Manipulate the trap and condition code bits (tbit and cbit) */
#define Set_tbit() Bitfield_deposit(1,25,1,Fpustatus_register)
#define Clear_tbit() Bitfield_deposit(0,25,1,Fpustatus_register)
#define Is_tbit_set() Tbit(Fpustatus_register)
#define Is_cbit_set() Cbit(Fpustatus_register)

#define Set_status_cbit(value)  \
        Bitfield_deposit(value,5,1,Fpustatus_register)

/*******************************
 * Condition field referencing *
 *******************************/
#define Unordered(cond) Unorderedbit(cond)
#define Equal(cond) Equalbit(cond)
#define Lessthan(cond) Lessthanbit(cond)
#define Greaterthan(cond) Greaterthanbit(cond)
#define Exception(cond) Exceptionbit(cond)


/* Defines for the extension */
#define Ext_isone_sign(extent) (Extsign(extent))
#define Ext_isnotzero(extent) \
    (Extall(extent))
#define Ext_isnotzero_lower(extent) \
    (Extlow31(extent))
#define Ext_leftshiftby1(extent) \
    Extall(extent) <<= 1
#define Ext_negate(extent) \
    (int )Extall(extent) = 0 - (int )Extall(extent)
#define Ext_setone_low(extent) Bitfield_deposit(1,31,1,extent)
#define Ext_setzero(extent) Extall(extent) = 0

typedef int operation;

/* error messages */

#define		NONE		0
#define		UNDEFFPINST	1

/* Function definitions: opcode, opclass */
#define FTEST	(1<<2) | 0
#define FCPY	(2<<2) | 0
#define FABS	(3<<2) | 0
#define FSQRT   (4<<2) | 0
#define FRND    (5<<2) | 0

#define FCNVFF	(0<<2) | 1
#define FCNVXF	(1<<2) | 1
#define FCNVFX	(2<<2) | 1
#define FCNVFXT	(3<<2) | 1

#define FCMP    (0<<2) | 2

#define FADD	(0<<2) | 3
#define FSUB	(1<<2) | 3
#define FMPY	(2<<2) | 3
#define FDIV	(3<<2) | 3
#define FREM	(4<<2) | 3