/*      $NetBSD: sgl_float.h,v 1.4 2022/05/28 22:08:47 andvar Exp $     */

/*      $OpenBSD: sgl_float.h,v 1.10 2004/01/02 14:39:01 mickey Exp $   */

/*
* Copyright 1996 1995 by Open Software Foundation, Inc.
*              All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* pmk1.1
*/
/*
* (c) Copyright 1986 HEWLETT-PACKARD COMPANY
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
*     permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of Hewlett-Packard Company not be
* used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission.
* Hewlett-Packard Company makes no representations about the
* suitability of this software for any purpose.
*/

#include <sys/cdefs.h>

/******************************
* Single precision functions *
******************************/

/* 32-bit word grabbing functions */
#define Sgl_firstword(value) Sall(value)
#define Sgl_secondword(value) dummy_location
#define Sgl_thirdword(value) dummy_location
#define Sgl_fourthword(value) dummy_location

#define Sgl_sign(object) Ssign(object)
#define Sgl_exponent(object) Sexponent(object)
#define Sgl_signexponent(object) Ssignexponent(object)
#define Sgl_mantissa(object) Smantissa(object)
#define Sgl_exponentmantissa(object) Sexponentmantissa(object)
#define Sgl_all(object) Sall(object)

/* sgl_and_signs ands the sign bits of each argument and puts the result
* into the first argument. sgl_or_signs ors those same sign bits */
#define Sgl_and_signs( src1dst, src2)           \
   Sall(src1dst) = (Sall(src2)|~(1<<31)) & Sall(src1dst)
#define Sgl_or_signs( src1dst, src2)            \
   Sall(src1dst) = (Sall(src2)&(1<<31)) | Sall(src1dst)

/* The hidden bit is always the low bit of the exponent */
#define Sgl_clear_exponent_set_hidden(srcdst) Deposit_sexponent(srcdst,1)
#define Sgl_clear_signexponent_set_hidden(srcdst) \
   Deposit_ssignexponent(srcdst,1)
#define Sgl_clear_sign(srcdst) Sall(srcdst) &= ~(1<<31)
#define Sgl_clear_signexponent(srcdst) Sall(srcdst) &= 0x007fffff

/* varamount must be less than 32 for the next three functions */
#define Sgl_rightshift(srcdst, varamount)       \
   Sall(srcdst) >>= varamount
#define Sgl_leftshift(srcdst, varamount)        \
   Sall(srcdst) <<= varamount
#define Sgl_rightshift_exponentmantissa(srcdst, varamount) \
   Sall(srcdst) = \
       (Sexponentmantissa(srcdst) >> (varamount)) | (Sall(srcdst) & (1<<31))

#define Sgl_leftshiftby1_withextent(left,right,result) \
   Shiftdouble(Sall(left),Extall(right),31,Sall(result))

#define Sgl_rightshiftby1_withextent(left,right,dst)            \
   Shiftdouble(Sall(left),Extall(right),1,Extall(right))
#define Sgl_arithrightshiftby1(srcdst)  \
   Sall(srcdst) = (int)Sall(srcdst) >> 1

/* Sign extend the sign bit with an integer destination */
#define Sgl_signextendedsign(value) Ssignedsign(value)

#define Sgl_isone_hidden(sgl_value) (Shidden(sgl_value))
#define Sgl_increment(sgl_value) Sall(sgl_value) += 1
#define Sgl_increment_mantissa(sgl_value) \
   Deposit_smantissa(sgl_value,sgl_value+1)
#define Sgl_decrement(sgl_value) Sall(sgl_value) -= 1

#define Sgl_isone_sign(sgl_value) (Is_ssign(sgl_value)!=0)
#define Sgl_isone_hiddenoverflow(sgl_value) \
   (Is_shiddenoverflow(sgl_value)!=0)
#define Sgl_isone_lowmantissa(sgl_value) (Is_slow(sgl_value)!=0)
#define Sgl_isone_signaling(sgl_value) (Is_ssignaling(sgl_value)!=0)
#define Sgl_is_signalingnan(sgl_value) (Ssignalingnan(sgl_value)==0x1ff)
#define Sgl_isnotzero(sgl_value) (Sall(sgl_value)!=0)
#define Sgl_isnotzero_hiddenhigh7mantissa(sgl_value) \
   (Shiddenhigh7mantissa(sgl_value)!=0)
#define Sgl_isnotzero_low4(sgl_value) (Slow4(sgl_value)!=0)
#define Sgl_isnotzero_exponent(sgl_value) (Sexponent(sgl_value)!=0)
#define Sgl_isnotzero_mantissa(sgl_value) (Smantissa(sgl_value)!=0)
#define Sgl_isnotzero_exponentmantissa(sgl_value) \
   (Sexponentmantissa(sgl_value)!=0)
#define Sgl_iszero(sgl_value) (Sall(sgl_value)==0)
#define Sgl_iszero_signaling(sgl_value) (Is_ssignaling(sgl_value)==0)
#define Sgl_iszero_hidden(sgl_value) (Is_shidden(sgl_value)==0)
#define Sgl_iszero_hiddenoverflow(sgl_value) \
   (Is_shiddenoverflow(sgl_value)==0)
#define Sgl_iszero_hiddenhigh3mantissa(sgl_value) \
   (Shiddenhigh3mantissa(sgl_value)==0)
#define Sgl_iszero_hiddenhigh7mantissa(sgl_value) \
   (Shiddenhigh7mantissa(sgl_value)==0)
#define Sgl_iszero_sign(sgl_value) (Is_ssign(sgl_value)==0)
#define Sgl_iszero_exponent(sgl_value) (Sexponent(sgl_value)==0)
#define Sgl_iszero_mantissa(sgl_value) (Smantissa(sgl_value)==0)
#define Sgl_iszero_exponentmantissa(sgl_value) \
   (Sexponentmantissa(sgl_value)==0)
#define Sgl_isinfinity_exponent(sgl_value)              \
   (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT)
#define Sgl_isnotinfinity_exponent(sgl_value)           \
   (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT)
#define Sgl_isinfinity(sgl_value)                       \
   (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT &&  \
   Sgl_mantissa(sgl_value)==0)
#define Sgl_isnan(sgl_value)                            \
   (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT &&  \
   Sgl_mantissa(sgl_value)!=0)
#define Sgl_isnotnan(sgl_value)                         \
   (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT ||  \
   Sgl_mantissa(sgl_value)==0)
#define Sgl_islessthan(sgl_op1,sgl_op2)                 \
   (Sall(sgl_op1) < Sall(sgl_op2))
#define Sgl_isgreaterthan(sgl_op1,sgl_op2)              \
   (Sall(sgl_op1) > Sall(sgl_op2))
#define Sgl_isnotlessthan(sgl_op1,sgl_op2)              \
   (Sall(sgl_op1) >= Sall(sgl_op2))
#define Sgl_isequal(sgl_op1,sgl_op2)                    \
   (Sall(sgl_op1) == Sall(sgl_op2))

#define Sgl_leftshiftby8(sgl_value) \
   Sall(sgl_value) <<= 8
#define Sgl_leftshiftby4(sgl_value) \
   Sall(sgl_value) <<= 4
#define Sgl_leftshiftby3(sgl_value) \
   Sall(sgl_value) <<= 3
#define Sgl_leftshiftby2(sgl_value) \
   Sall(sgl_value) <<= 2
#define Sgl_leftshiftby1(sgl_value) \
   Sall(sgl_value) <<= 1
#define Sgl_rightshiftby1(sgl_value) \
   Sall(sgl_value) >>= 1
#define Sgl_rightshiftby4(sgl_value) \
   Sall(sgl_value) >>= 4
#define Sgl_rightshiftby8(sgl_value) \
   Sall(sgl_value) >>= 8

#define Sgl_ismagnitudeless(signlessleft,signlessright)                 \
/*  unsigned int signlessleft, signlessright; */                        \
     (signlessleft < signlessright)


#define Sgl_copytoint_exponentmantissa(source,dest)     \
   dest = Sexponentmantissa(source)

/* A quiet NaN has the high mantissa bit clear and at least on other (in this
* case the adjacent bit) bit set. */
#define Sgl_set_quiet(sgl_value) Deposit_shigh2mantissa(sgl_value,1)
#define Sgl_set_exponent(sgl_value,exp) Deposit_sexponent(sgl_value,exp)

#define Sgl_set_mantissa(dest,value) Deposit_smantissa(dest,value)
#define Sgl_set_exponentmantissa(dest,value) \
   Deposit_sexponentmantissa(dest,value)

/*  An infinity is represented with the max exponent and a zero mantissa */
#define Sgl_setinfinity_exponent(sgl_value) \
   Deposit_sexponent(sgl_value,SGL_INFINITY_EXPONENT)
#define Sgl_setinfinity_exponentmantissa(sgl_value)     \
   Deposit_sexponentmantissa(sgl_value, \
       (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))))
#define Sgl_setinfinitypositive(sgl_value)              \
   Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH)))
#define Sgl_setinfinitynegative(sgl_value)              \
   Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) \
   | (1<<31)
#define Sgl_setinfinity(sgl_value,sign)                                 \
   Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) | \
    (sign << 31)
#define Sgl_sethigh4bits(sgl_value, extsign)  \
   Deposit_shigh4(sgl_value,extsign)
#define Sgl_set_sign(sgl_value,sign) Deposit_ssign(sgl_value,sign)
#define Sgl_invert_sign(sgl_value)  \
   Deposit_ssign(sgl_value,~Ssign(sgl_value))
#define Sgl_setone_sign(sgl_value) Deposit_ssign(sgl_value,1)
#define Sgl_setone_lowmantissa(sgl_value) Deposit_slow(sgl_value,1)
#define Sgl_setzero_sign(sgl_value)  Sall(sgl_value) &= 0x7fffffff
#define Sgl_setzero_exponent(sgl_value) Sall(sgl_value) &= 0x807fffff
#define Sgl_setzero_mantissa(sgl_value) Sall(sgl_value) &= 0xff800000
#define Sgl_setzero_exponentmantissa(sgl_value)  Sall(sgl_value) &= 0x80000000
#define Sgl_setzero(sgl_value) Sall(sgl_value) = 0
#define Sgl_setnegativezero(sgl_value) Sall(sgl_value) = 1 << 31

/* Use following macro for both overflow & underflow conditions */
#define ovfl -
#define unfl +
#define Sgl_setwrapped_exponent(sgl_value,exponent,op) \
   Deposit_sexponent(sgl_value,(exponent op SGL_WRAP))

#define Sgl_setlargestpositive(sgl_value)                               \
   Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))  \
                       | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1)
#define Sgl_setlargestnegative(sgl_value)                               \
   Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))  \
                       | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 ) | (1<<31)

#define Sgl_setnegativeinfinity(sgl_value)      \
   Sall(sgl_value) =                           \
   ((1<<SGL_EXP_LENGTH) | SGL_INFINITY_EXPONENT) << (32-(1+SGL_EXP_LENGTH))
#define Sgl_setlargest(sgl_value,sign)                                  \
   Sall(sgl_value) = ((sign) << 31) |                                  \
       (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))               \
         | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
#define Sgl_setlargest_exponentmantissa(sgl_value)                      \
   Sall(sgl_value) = (Sall(sgl_value) & (1<<31)) |                     \
       (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))               \
         | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))

/* The high bit is always zero so arithmetic or logical shifts will work. */
#define Sgl_right_align(srcdst,shift,extent)                            \
   /* sgl_floating_point srcdst; int shift; extension extent */        \
   if (shift < 32) {                                                   \
       Extall(extent) = Sall(srcdst) << (32-(shift));                  \
       Sall(srcdst) >>= shift;                                         \
   }                                                                   \
   else {                                                              \
       Extall(extent) = Sall(srcdst);                                  \
       Sall(srcdst) = 0;                                               \
   }
#define Sgl_hiddenhigh3mantissa(sgl_value) Shiddenhigh3mantissa(sgl_value)
#define Sgl_hidden(sgl_value) Shidden(sgl_value)
#define Sgl_lowmantissa(sgl_value) Slow(sgl_value)

/* The left argument is never smaller than the right argument */
#define Sgl_subtract(sgl_left,sgl_right,sgl_result) \
   Sall(sgl_result) = Sall(sgl_left) - Sall(sgl_right)

/* Subtract right augmented with extension from left augmented with zeros and
* store into result and extension. */
#define Sgl_subtract_withextension(left,right,extent,result)            \
   /* sgl_floating_point left,right,result; extension extent */        \
 Sgl_subtract(left,right,result);                                      \
 if((Extall(extent) = 0-Extall(extent)))                               \
     Sall(result) = Sall(result)-1

#define Sgl_addition(sgl_left,sgl_right,sgl_result) \
   Sall(sgl_result) = Sall(sgl_left) + Sall(sgl_right)

#define Sgl_xortointp1(left,right,result)                       \
   result = Sall(left) XOR Sall(right);

#define Sgl_xorfromintp1(left,right,result)                     \
   Sall(result) = left XOR Sall(right)

/* Need to Initialize */
#define Sgl_makequietnan(dest)                                          \
   Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH))      \
               | (1<<(32-(1+SGL_EXP_LENGTH+2)))
#define Sgl_makesignalingnan(dest)                                      \
   Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH))      \
               | (1<<(32-(1+SGL_EXP_LENGTH+1)))

#define Sgl_normalize(sgl_opnd,exponent)                        \
       while(Sgl_iszero_hiddenhigh7mantissa(sgl_opnd)) {       \
               Sgl_leftshiftby8(sgl_opnd);                     \
               exponent -= 8;                                  \
       }                                                       \
       if(Sgl_iszero_hiddenhigh3mantissa(sgl_opnd)) {          \
               Sgl_leftshiftby4(sgl_opnd);                     \
               exponent -= 4;                                  \
       }                                                       \
       while(Sgl_iszero_hidden(sgl_opnd)) {                    \
               Sgl_leftshiftby1(sgl_opnd);                     \
               exponent -= 1;                                  \
       }

#define Sgl_setoverflow(sgl_opnd)                               \
       /* set result to infinity or largest number */          \
       switch (Rounding_mode()) {                              \
               case ROUNDPLUS:                                 \
                       if (Sgl_isone_sign(sgl_opnd)) {         \
                               Sgl_setlargestnegative(sgl_opnd); \
                       }                                       \
                       else {                                  \
                               Sgl_setinfinitypositive(sgl_opnd); \
                       }                                       \
                       break;                                  \
               case ROUNDMINUS:                                \
                       if (Sgl_iszero_sign(sgl_opnd)) {        \
                               Sgl_setlargestpositive(sgl_opnd); \
                       }                                       \
                       else {                                  \
                               Sgl_setinfinitynegative(sgl_opnd); \
                       }                                       \
                       break;                                  \
               case ROUNDNEAREST:                              \
                       Sgl_setinfinity_exponentmantissa(sgl_opnd); \
                       break;                                  \
               case ROUNDZERO:                                 \
                       Sgl_setlargest_exponentmantissa(sgl_opnd); \
       }

#define Sgl_denormalize(opnd,exponent,guard,sticky,inexact)             \
       Sgl_clear_signexponent_set_hidden(opnd);                        \
       if (exponent >= (1 - SGL_P)) {                                  \
               guard = (Sall(opnd) >> (-(exponent))) & 1;              \
               if (exponent < 0) sticky |= Sall(opnd) << (32+exponent); \
               inexact = (guard) | (sticky);                           \
               Sall(opnd) >>= (1-exponent);                            \
       }                                                               \
       else {                                                          \
               guard = 0;                                              \
               sticky |= Sall(opnd);                                   \
               inexact = sticky;                                       \
               Sgl_setzero(opnd);                                      \
       }

sgl_floating_point sgl_setoverflow(unsigned int);
int sgl_fadd(sgl_floating_point *, sgl_floating_point *, sgl_floating_point *, unsigned int *);
int sgl_fcmp(sgl_floating_point *, sgl_floating_point *, unsigned int, unsigned int *);
int sgl_fdiv(sgl_floating_point *, sgl_floating_point *, sgl_floating_point *, unsigned int *);
int sgl_fmpy(sgl_floating_point *, sgl_floating_point *, sgl_floating_point *, unsigned int *);
int sgl_frem(sgl_floating_point *, sgl_floating_point *, sgl_floating_point *, unsigned int *);
int sgl_fsqrt(sgl_floating_point *, sgl_floating_point *, unsigned int *);
int sgl_fsub(sgl_floating_point *, sgl_floating_point *, sgl_floating_point *, unsigned int *);
int sgl_frnd(sgl_floating_point *, sgl_floating_point *, unsigned int *);

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