/* 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