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/* $OpenBSD: cnv_float.h,v 1.5 2001/03/29 03:58:17 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.
*/
/*
* Some more constants
*/
#define SGL_FX_MAX_EXP 30
#define DBL_FX_MAX_EXP 62
#define QUAD_FX_MAX_EXP 126
#define Dintp1(object) (object)
#define Dintp2(object) (object)
#define Qintp0(object) (object)
#define Qintp1(object) (object)
#define Qintp2(object) (object)
#define Qintp3(object) (object)
/*
* These macros will be used specifically by the convert instructions.
*
*
* Single format macros
*/
#define Sgl_to_dbl_exponent(src_exponent,dest) \
Deposit_dexponent(dest,src_exponent+(DBL_BIAS-SGL_BIAS))
#define Sgl_to_dbl_mantissa(src_mantissa,destA,destB) \
Deposit_dmantissap1(destA,src_mantissa>>3); \
Dmantissap2(destB) = src_mantissa << 29
#define Sgl_isinexact_to_fix(sgl_value,exponent) \
((exponent < (SGL_P - 1)) ? \
(Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) : FALSE)
#define Int_isinexact_to_sgl(int_value) (int_value << (33 - SGL_EXP_LENGTH))
#define Sgl_roundnearest_from_int(int_value,sgl_value) \
if (int_value & 1<<(SGL_EXP_LENGTH - 2)) /* round bit */ \
if ((int_value << (34 - SGL_EXP_LENGTH)) || Slow(sgl_value)) \
Sall(sgl_value)++
#define Dint_isinexact_to_sgl(dint_valueA,dint_valueB) \
((Dintp1(dint_valueA) << (33 - SGL_EXP_LENGTH)) || Dintp2(dint_valueB))
#define Sgl_roundnearest_from_dint(dint_valueA,dint_valueB,sgl_value) \
if (Dintp1(dint_valueA) & 1<<(SGL_EXP_LENGTH - 2)) \
if ((Dintp1(dint_valueA) << (34 - SGL_EXP_LENGTH)) || \
Dintp2(dint_valueB) || Slow(sgl_value)) Sall(sgl_value)++
#define Dint_isinexact_to_dbl(dint_value) \
(Dintp2(dint_value) << (33 - DBL_EXP_LENGTH))
#define Dbl_roundnearest_from_dint(dint_opndB,dbl_opndA,dbl_opndB) \
if (Dintp2(dint_opndB) & 1<<(DBL_EXP_LENGTH - 2)) \
if ((Dintp2(dint_opndB) << (34 -DBL_EXP_LENGTH)) || Dlowp2(dbl_opndB)) \
if ((++Dallp2(dbl_opndB))==0) Dallp1(dbl_opndA)++
#define Sgl_isone_roundbit(sgl_value,exponent) \
((Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) >> 31)
#define Sgl_isone_stickybit(sgl_value,exponent) \
(exponent < (SGL_P - 2) ? \
Sall(sgl_value) << (SGL_EXP_LENGTH + 2 + exponent) : FALSE)
/*
* Double format macros
*/
#define Dbl_to_sgl_exponent(src_exponent,dest) \
dest = src_exponent + (SGL_BIAS - DBL_BIAS)
#define Dbl_to_sgl_mantissa(srcA,srcB,dest,inexact,guard,sticky,odd) \
Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \
guard = Dbit3p2(srcB); \
sticky = Dallp2(srcB)<<4; \
inexact = guard | sticky; \
odd = Dbit2p2(srcB)
#define Dbl_to_sgl_denormalized(srcA,srcB,exp,dest,inexact,guard,sticky,odd,tiny) \
Deposit_dexponent(srcA,1); \
tiny = TRUE; \
if (exp >= -2) { \
if (exp == 0) { \
inexact = Dallp2(srcB) << 3; \
guard = inexact >> 31; \
sticky = inexact << 1; \
Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \
odd = dest << 31; \
if (inexact) { \
switch(Rounding_mode()) { \
case ROUNDPLUS: \
if (Dbl_iszero_sign(srcA)) { \
dest++; \
if (Sgl_isone_hidden(dest)) \
tiny = FALSE; \
dest--; \
} \
break; \
case ROUNDMINUS: \
if (Dbl_isone_sign(srcA)) { \
dest++; \
if (Sgl_isone_hidden(dest)) \
tiny = FALSE; \
dest--; \
} \
break; \
case ROUNDNEAREST: \
if (guard && (sticky || odd)) { \
dest++; \
if (Sgl_isone_hidden(dest)) \
tiny = FALSE; \
dest--; \
} \
break; \
} \
} \
/* shift right by one to get correct result */ \
guard = odd; \
sticky = inexact; \
inexact |= guard; \
dest >>= 1; \
Deposit_dsign(srcA,0); \
Shiftdouble(Dallp1(srcA),Dallp2(srcB),30,dest); \
odd = dest << 31; \
} \
else { \
inexact = Dallp2(srcB) << (2 + exp); \
guard = inexact >> 31; \
sticky = inexact << 1; \
Deposit_dsign(srcA,0); \
if (exp == -2) dest = Dallp1(srcA); \
else Variable_shift_double(Dallp1(srcA),Dallp2(srcB),30-exp,dest); \
odd = dest << 31; \
} \
} \
else { \
Deposit_dsign(srcA,0); \
if (exp > (1 - SGL_P)) { \
dest = Dallp1(srcA) >> (- 2 - exp); \
inexact = Dallp1(srcA) << (34 + exp); \
guard = inexact >> 31; \
sticky = (inexact << 1) | Dallp2(srcB); \
inexact |= Dallp2(srcB); \
odd = dest << 31; \
} \
else { \
dest = 0; \
inexact = Dallp1(srcA) | Dallp2(srcB); \
if (exp == (1 - SGL_P)) { \
guard = Dhidden(srcA); \
sticky = Dmantissap1(srcA) | Dallp2(srcB); \
} \
else { \
guard = 0; \
sticky = inexact; \
} \
odd = 0; \
} \
} \
exp = 0
#define Dbl_isinexact_to_fix(dbl_valueA,dbl_valueB,exponent) \
(exponent < (DBL_P-33) ? \
Dallp2(dbl_valueB) || Dallp1(dbl_valueA) << (DBL_EXP_LENGTH+1+exponent) : \
(exponent < (DBL_P-1) ? Dallp2(dbl_valueB) << (exponent + (33-DBL_P)) : \
FALSE))
#define Dbl_isoverflow_to_int(exponent,dbl_valueA,dbl_valueB) \
((exponent > SGL_FX_MAX_EXP + 1) || Dsign(dbl_valueA)==0 || \
Dmantissap1(dbl_valueA)!=0 || (Dallp2(dbl_valueB)>>21)!=0 )
#define Dbl_isone_roundbit(dbl_valueA,dbl_valueB,exponent) \
((exponent < (DBL_P - 33) ? \
Dallp1(dbl_valueA) >> ((30 - DBL_EXP_LENGTH) - exponent) : \
Dallp2(dbl_valueB) >> ((DBL_P - 2) - exponent)) & 1)
#define Dbl_isone_stickybit(dbl_valueA,dbl_valueB,exponent) \
(exponent < (DBL_P-34) ? \
(Dallp2(dbl_valueB) || Dallp1(dbl_valueA)<<(DBL_EXP_LENGTH+2+exponent)) : \
(exponent<(DBL_P-2) ? (Dallp2(dbl_valueB) << (exponent + (34-DBL_P))) : \
FALSE))
/* Int macros */
#define Int_from_sgl_mantissa(sgl_value,exponent) \
Sall(sgl_value) = \
(unsigned)(Sall(sgl_value) << SGL_EXP_LENGTH)>>(31 - exponent)
#define Int_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent) \
Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),22,Dallp1(dbl_valueA)); \
if (exponent < 31) Dallp1(dbl_valueA) >>= 30 - exponent; \
else Dallp1(dbl_valueA) <<= 1
#define Int_negate(int_value) int_value = -int_value
/* Dint macros */
#define Dint_from_sgl_mantissa(sgl_value,exponent,dresultA,dresultB) \
{Sall(sgl_value) <<= SGL_EXP_LENGTH; /* left-justify */ \
if (exponent <= 31) { \
Dintp1(dresultA) = 0; \
Dintp2(dresultB) = (unsigned)Sall(sgl_value) >> (31 - exponent); \
} \
else { \
Dintp1(dresultA) = Sall(sgl_value) >> (63 - exponent); \
Dintp2(dresultB) = Sall(sgl_value) << (exponent - 31); \
}}
#define Dint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) \
{if (exponent < 32) { \
Dintp1(destA) = 0; \
if (exponent <= 20) \
Dintp2(destB) = Dallp1(dbl_valueA) >> (20-(exponent)); \
else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \
(52-(exponent)),Dintp2(destB)); \
} \
else { \
if (exponent <= 52) { \
Dintp1(destA) = Dallp1(dbl_valueA) >> (52-(exponent)); \
if (exponent == 52) Dintp2(destB) = Dallp2(dbl_valueB); \
else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \
52-exponent,Dintp2(destB)); \
} \
else { \
Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \
84-exponent,Dintp1(destA)); \
Dintp2(destB) = Dallp2(dbl_valueB) << ((exponent)-52); \
} \
}}
#define Dint_setzero(dresultA,dresultB) \
Dintp1(dresultA) = 0; \
Dintp2(dresultB) = 0
#define Dint_setone_sign(dresultA,dresultB) \
Dintp1(dresultA) = ~Dintp1(dresultA); \
if ((Dintp2(dresultB) = -Dintp2(dresultB)) == 0) Dintp1(dresultA)++
#define Dint_set_minint(dresultA,dresultB) \
Dintp1(dresultA) = 1<<31; \
Dintp2(dresultB) = 0
#define Dint_isone_lowp2(dresultB) (Dintp2(dresultB) & 01)
#define Dint_increment(dresultA,dresultB) \
if ((++Dintp2(dresultB))==0) Dintp1(dresultA)++
#define Dint_decrement(dresultA,dresultB) \
if ((Dintp2(dresultB)--)==0) Dintp1(dresultA)--
#define Dint_negate(dresultA,dresultB) \
Dintp1(dresultA) = ~Dintp1(dresultA); \
if ((Dintp2(dresultB) = -Dintp2(dresultB))==0) Dintp1(dresultA)++
#define Dint_copyfromptr(src,destA,destB) \
Dintp1(destA) = src->wd0; \
Dintp2(destB) = src->wd1
#define Dint_copytoptr(srcA,srcB,dest) \
dest->wd0 = Dintp1(srcA); \
dest->wd1 = Dintp2(srcB)
/* other macros */
#define Find_ms_one_bit(value, position) \
{ \
int var; \
for (var=8; var >=1; var >>= 1) { \
if (value >> (32 - position)) \
position -= var; \
else position += var; \
} \
if ((value >> (32 - position)) == 0) \
position--; \
else position -= 2; \
}
/*
* The following 4 functions handle the assignment of a floating point
* number to a 32-bit integer in cases where the floating point number
* is too large (or small) to fit in the integer field.
*
* In all these cases, HP-UX would return an UNIMPLEMENTEDEXCEPTION
* resulting in a SIGFPE being sent to the process. For BSD's math
* library (and various other applications), this was unacceptable.
* As a result, we now return maxint/minint (like most other OS's)
* and either return an INEXACTEXCEPTION (SIGFPE) or set the inexact
* flag (so that the program may continue execution).
*
* After discussing this with Jerry Huck @ HP, the one case where we
* differ from BSD is for programs that try to convert a NaN to an
* integer; in this case, we will return an UNIMPLEMENTEDEXCEPTION
* since doing anything else would be completely unreasonable.
*
* jef
*/
#define Dbl_return_overflow(srcp1, srcp2, resultp) \
{ \
if (Dbl_isnan(srcp1, srcp2)) \
return(UNIMPLEMENTEDEXCEPTION); \
if (Dbl_iszero_sign(srcp1)) \
*resultp = 0x7fffffff; \
else \
*resultp = 0x80000000; \
if (Is_overflowtrap_enabled()) { \
if (Is_inexacttrap_enabled()) \
return(OVERFLOWEXCEPTION|INEXACTEXCEPTION); \
else \
Set_inexactflag(); \
return(OVERFLOWEXCEPTION); \
} \
return(NOEXCEPTION); \
}
#define Dbl_return_overflow_dbl(srcp1, srcp2, resultp) \
{ \
if (Dbl_isnan(srcp1, srcp2)) \
return(UNIMPLEMENTEDEXCEPTION); \
if (Dbl_iszero_sign(srcp1)) { \
Dint_copytoptr(0x7fffffff,0xffffffff,resultp); \
} else { \
Dint_copytoptr(0x80000000,0x00000000,resultp); \
} \
if (Is_overflowtrap_enabled()) { \
if (Is_inexacttrap_enabled()) \
return(OVERFLOWEXCEPTION|INEXACTEXCEPTION); \
else \
Set_inexactflag(); \
return(OVERFLOWEXCEPTION); \
} \
return(NOEXCEPTION); \
}
#define Sgl_return_overflow(src, resultp) \
{ \
if (Sgl_isnan(src)) \
return(UNIMPLEMENTEDEXCEPTION); \
if (Sgl_iszero_sign(src)) \
*resultp = 0x7fffffff; \
else \
*resultp = 0x80000000; \
if (Is_overflowtrap_enabled()) { \
if (Is_inexacttrap_enabled()) \
return(OVERFLOWEXCEPTION|INEXACTEXCEPTION); \
else \
Set_inexactflag(); \
return(OVERFLOWEXCEPTION); \
} \
return(NOEXCEPTION); \
}
#define Sgl_return_overflow_dbl(src, resultp) \
{ \
if (Sgl_isnan(src)) \
return(UNIMPLEMENTEDEXCEPTION); \
if (Sgl_iszero_sign(src)) { \
Dint_copytoptr(0x7fffffff,0xffffffff,resultp); \
} else { \
Dint_copytoptr(0x80000000,0x00000000,resultp); \
} \
if (Is_overflowtrap_enabled()) { \
if (Is_inexacttrap_enabled()) \
return(OVERFLOWEXCEPTION|INEXACTEXCEPTION); \
else \
Set_inexactflag(); \
return(OVERFLOWEXCEPTION); \
} \
return(NOEXCEPTION); \
}
int sgl_to_sgl_fcnvfx __P((sgl_floating_point *, sgl_floating_point *, unsigned int *));
int sgl_to_dbl_fcnvfx __P((sgl_floating_point *, dbl_integer *, unsigned int *));
int dbl_to_sgl_fcnvfx __P((dbl_floating_point *, int *, unsigned int *));
int dbl_to_dbl_fcnvfx __P((dbl_floating_point *, dbl_integer *, unsigned int *));
int sgl_to_sgl_fcnvfxt __P((sgl_floating_point *, int *, unsigned int *));
int sgl_to_dbl_fcnvfxt __P((sgl_floating_point *, dbl_integer *, unsigned int *));
int dbl_to_sgl_fcnvfxt __P((dbl_floating_point *, int *, unsigned int *));
int dbl_to_dbl_fcnvfxt __P((dbl_floating_point *, dbl_integer *, unsigned int *));
int sgl_to_sgl_fcnvxf __P((int *, sgl_floating_point *, unsigned int *));
int sgl_to_dbl_fcnvxf __P((int *, dbl_floating_point *, unsigned int *));
int dbl_to_sgl_fcnvxf __P((dbl_integer *, sgl_floating_point *, unsigned int *));
int dbl_to_dbl_fcnvxf __P((dbl_integer *, dbl_floating_point *, unsigned int *));
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