New #finite, fix #isNaN.
"
COPYRIGHT (c) 1996 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
LimitedPrecisionReal variableByteSubclass:#ShortFloat
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Magnitude-Numbers'
!
!ShortFloat primitiveDefinitions!
%{
/*
* includes, defines, structure definitions
* and typedefs come here.
*/
#if defined (_AIX)
# include <float.h>
#endif
#if defined(IRIX)
# include <nan.h>
#endif
#if defined(LINUX)
# include <nan.h>
#endif
#if defined(solaris) || defined(sunos)
# include <nan.h>
#endif
%}
! !
!ShortFloat class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1996 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
ShortFloats represent rational numbers with limited precision. In ST/X, Float uses
the underlying C-compilers double implementation, while ShortFloats are
mapped onto C-floats.
Therefore instances of Float are usually represented by the 8-byte IEE
double precision float format, while ShortFloats use 4byte IEE format.
(but there is no guaranty).
Notice, that ST/X Floats are what Doubles are in ST-80 and ShortFloats are
ST-80's Floats respectively.
This may change in one of the next versions (at least on machines, which
provide different float and double types in their C-compiler.
WARNING:
The layout of shortFloat instances is known by the runtime system and the compiler;
you may not add instance variables here.
Also, subclassing is complicated by the fact, that the VM creates floats/shortFloats,
and does its float-checks by an identity compare with the ShortFloat-class.
(i.e. your subclasses instances may not be recognized as float-like objects,
thus mixed mode arithmetic will always coerce them, effectively slowing things down).
This may be changed, to use a flag bit in the class.
[author:]
Claus Gittinger
[see also:]
Number
Float Fraction FixedPoint Integer
"
! !
!ShortFloat class methodsFor:'instance creation'!
basicNew
"return a new shortFloat - here we return 0.0
- shortFloats are usually NOT created this way ...
Its implemented here to allow things like binary store & load
of shortFloats. (but even this support will go away eventually, its not
a good idea to store the bits of a float - the reader might have a
totally different representation - so floats will eventually be
binary stored in a device independent format."
%{ /* NOCONTEXT */
OBJ newFloat;
__qMKSFLOAT(newFloat, 0.0);
RETURN (newFloat);
%}
! !
!ShortFloat class methodsFor:'constants'!
pi
"return the constant pi as ShortFloat"
^ 3.14159 asShortFloat
"Modified: 23.4.1996 / 09:26:31 / cg"
!
unity
"return the neutral element for multiplication (1.0) as ShortFloat"
^ 1.0 asShortFloat
"Modified: 23.4.1996 / 09:26:51 / cg"
!
zero
"return the neutral element for addition (0.0) as ShortFloat"
^ 0.0 asShortFloat
"Modified: 23.4.1996 / 09:26:45 / cg"
! !
!ShortFloat class methodsFor:'queries'!
isBuiltInClass
"return true if this class is known by the run-time-system.
Here, true is returned for myself, false for subclasses."
^ self == ShortFloat
"Modified: 23.4.1996 / 16:00:23 / cg"
! !
!ShortFloat methodsFor:'arithmetic'!
* aNumber
"return the product of the receiver and the argument, aNumber"
%{ /* NOCONTEXT */
OBJ newFloat;
float result;
double dResult;
if (__isSmallInteger(aNumber)) {
result = __shortFloatVal(self) * (float)(__intVal(aNumber));
retResult:
__qMKSFLOAT(newFloat, result);
RETURN ( newFloat );
}
if (__isShortFloat(aNumber)) {
result = __shortFloatVal(self) * __shortFloatVal(aNumber);
goto retResult;
}
if (__isFloatLike(aNumber)) {
dResult = (double) __shortFloatVal(self)* __floatVal(aNumber);
__qMKFLOAT(newFloat, dResult);
RETURN ( newFloat );
}
%}.
^ aNumber productFromShortFloat:self
!
+ aNumber
"return the sum of the receiver and the argument, aNumber"
%{ /* NOCONTEXT */
OBJ newFloat;
float result;
double dResult;
if (__isSmallInteger(aNumber)) {
result = __shortFloatVal(self) + (float)(__intVal(aNumber));
retResult:
__qMKSFLOAT(newFloat, result);
RETURN ( newFloat );
}
if (__isShortFloat(aNumber)) {
result = __shortFloatVal(self) + __shortFloatVal(aNumber);
goto retResult;
}
if (__isFloatLike(aNumber)) {
dResult = (double) __shortFloatVal(self) + __floatVal(aNumber);
__qMKFLOAT(newFloat, dResult);
RETURN ( newFloat );
}
%}.
^ aNumber sumFromShortFloat:self
!
- aNumber
"return the difference of the receiver and the argument, aNumber"
%{ /* NOCONTEXT */
OBJ newFloat;
float result;
double dResult;
if (__isSmallInteger(aNumber)) {
result = __shortFloatVal(self) - (float)(__intVal(aNumber));
retResult:
__qMKSFLOAT(newFloat, result);
RETURN ( newFloat );
}
if (__isShortFloat(aNumber)) {
result = __shortFloatVal(self) - __shortFloatVal(aNumber);
goto retResult;
}
if (__isFloatLike(aNumber)) {
dResult = (double) __shortFloatVal(self) - __floatVal(aNumber);
__qMKFLOAT(newFloat, dResult);
RETURN ( newFloat );
}
%}.
^ aNumber differenceFromShortFloat:self
!
/ aNumber
"return the quotient of the receiver and the argument, aNumber"
%{ /* NOCONTEXT */
OBJ newFloat;
float result, val;
double dResult, dVal;
if (__isSmallInteger(aNumber)) {
if (aNumber != __MKSMALLINT(0)) {
result = __shortFloatVal(self) / (float)(__intVal(aNumber));
retResult:
__qMKSFLOAT(newFloat, result);
RETURN ( newFloat );
}
}
if (__isShortFloat(aNumber)) {
val = __shortFloatVal(aNumber);
if (val != 0.0) {
result = __shortFloatVal(self) / val;
goto retResult;
}
}
if (__isFloatLike(aNumber)) {
dVal = __floatVal(aNumber);
if (dVal != 0.0) {
dResult = (double) __shortFloatVal(self) / dVal;
__qMKFLOAT(newFloat, dResult);
}
RETURN ( newFloat );
}
%}.
((aNumber == 0) or:[aNumber = 0.0]) ifTrue:[
"
No, you shalt not divide by zero
"
^ DivisionByZeroSignal raise.
].
^ aNumber quotientFromFloat:self
!
negated
"return myself negated"
%{ /* NOCONTEXT */
OBJ newFloat;
float rslt = - __shortFloatVal(self);
__qMKSFLOAT(newFloat, rslt);
RETURN ( newFloat );
%}
!
uncheckedDivide:aNumber
"return the quotient of the receiver and the argument, aNumber
Do not check for divide by zero (return NaN or infinity)"
%{ /* NOCONTEXT */
OBJ newFloat;
float result, val;
double dResult, dVal;
if (__isSmallInteger(aNumber)) {
result = __shortFloatVal(self) / (float)(__intVal(aNumber));
retResult:
__qMKSFLOAT(newFloat, result);
RETURN ( newFloat );
}
if (__isShortFloat(aNumber)) {
val = __shortFloatVal(aNumber);
result = __shortFloatVal(self) / val;
goto retResult;
}
if (__isFloatLike(aNumber)) {
dVal = __floatVal(aNumber);
dResult = (double) __shortFloatVal(self) / dVal;
__qMKFLOAT(newFloat, dResult);
RETURN ( newFloat );
}
%}.
^ aNumber quotientFromFloat:self
"
0.0 asShortFloat uncheckedDivide:0
1.0 asShortFloat uncheckedDivide:0.0
"
! !
!ShortFloat methodsFor:'coercion and converting'!
asDouble
"ST80 compatibility - return a Float with same value as the receiver"
^ self asFloat
!
asFloat
"return a Float with same value as the receiver"
%{ /* NOCONTEXT */
OBJ newFloat;
double dVal = (double)__shortFloatVal(self);
__qMKFLOAT(newFloat, dVal);
RETURN ( newFloat );
%}
"
1.0 asShortFloat asFloat
"
!
asInteger
"return an integer with same value - might truncate"
%{ /* NOCONTEXT */
float fVal;
fVal = __shortFloatVal(self);
if ((fVal >= (float)_MIN_INT) && (fVal <= (float)_MAX_INT)) {
RETURN ( __MKSMALLINT( (INT)fVal) );
}
%}.
^ super asInteger
"
12345.0 asShortFloat asInteger
1e15 asShortFloat asInteger
"
!
asShortFloat
"return a ShortFloat with same value as the receiver - thats me"
^ self
!
generality
"return the generality value - see ArithmeticValue>>retry:coercing:"
^ 70
! !
!ShortFloat methodsFor:'comparing'!
< aNumber
"return true, if the argument is greater"
%{ /* NOCONTEXT */
if (__isSmallInteger(aNumber)) {
RETURN ( (__shortFloatVal(self) < (float)(__intVal(aNumber))) ? true : false );
}
if (__isFloatLike(aNumber)) {
RETURN ( (double)(__shortFloatVal(self) < __floatVal(aNumber)) ? true : false );
}
if (__isShortFloat(aNumber)) {
RETURN ( (__shortFloatVal(self) < __shortFloatVal(aNumber)) ? true : false );
}
%}.
^ aNumber lessFromShortFloat:self
"
1.0 asShortFloat > (1/3)
"
!
<= aNumber
"return true, if the argument is greater or equal"
%{ /* NOCONTEXT */
if (__isSmallInteger(aNumber)) {
RETURN ( (__shortFloatVal(self) <= (float)(__intVal(aNumber))) ? true : false );
}
if (__isFloatLike(aNumber)) {
RETURN ( (double)(__shortFloatVal(self) <= __floatVal(aNumber)) ? true : false );
}
if (__isShortFloat(aNumber)) {
RETURN ( (__shortFloatVal(self) <= __shortFloatVal(aNumber)) ? true : false );
}
%}.
^ self retry:#<= coercing:aNumber
!
= aNumber
"return true, if the arguments value are equal by value"
%{ /* NOCONTEXT */
if (__isSmallInteger(aNumber)) {
RETURN ( (__shortFloatVal(self) == (float)(__intVal(aNumber))) ? true : false );
}
if (__isFloatLike(aNumber)) {
RETURN ( (double)(__shortFloatVal(self) == __floatVal(aNumber)) ? true : false );
}
if (__isShortFloat(aNumber)) {
RETURN ( (__shortFloatVal(self) == __shortFloatVal(aNumber)) ? true : false );
}
%}.
^ self retry:#= coercing:aNumber
!
> aNumber
"return true, if the argument is less"
%{ /* NOCONTEXT */
if (__isSmallInteger(aNumber)) {
RETURN ( (__shortFloatVal(self) > (float)(__intVal(aNumber))) ? true : false );
}
if (__isFloatLike(aNumber)) {
RETURN ( (double)(__shortFloatVal(self) > __floatVal(aNumber)) ? true : false );
}
if (__isShortFloat(aNumber)) {
RETURN ( (__shortFloatVal(self) > __shortFloatVal(aNumber)) ? true : false );
}
%}.
^ self retry:#> coercing:aNumber
!
>= aNumber
"return true, if the argument is less or equal"
%{ /* NOCONTEXT */
if (__isSmallInteger(aNumber)) {
RETURN ( (__shortFloatVal(self) >= (float)(__intVal(aNumber))) ? true : false );
}
if (__isFloatLike(aNumber)) {
RETURN ( (double)(__shortFloatVal(self) >= __floatVal(aNumber)) ? true : false );
}
if (__isShortFloat(aNumber)) {
RETURN ( (__shortFloatVal(self) >= __shortFloatVal(aNumber)) ? true : false );
}
%}.
^ self retry:#>= coercing:aNumber
!
hash
"return a number for hashing; redefined, since floats compare
by numeric value (i.e. 3.0 = 3), therefore 3.0 hash must be the same
as 3 hash."
|i|
(self >= SmallInteger minVal and:[self <= SmallInteger maxVal]) ifTrue:[
i := self asInteger.
self = i ifTrue:[
^ i hash
].
].
"
mhmh take some of my value-bits to hash on
"
^ (((self basicAt:4) bitAnd:16r3F) bitShift:24) +
((self basicAt:3) bitShift:16) +
((self basicAt:2) bitShift:8) +
(self basicAt:1)
"
1.2345 hash
1.2345 asShortFloat hash
1.0 hash
1.0 asShortFloat hash
"
!
~= aNumber
"return true, if the arguments value are not equal"
%{ /* NOCONTEXT */
if (__isSmallInteger(aNumber)) {
RETURN ( (__shortFloatVal(self) != (float)(__intVal(aNumber))) ? true : false );
}
if (__isFloatLike(aNumber)) {
RETURN ( (double)(__shortFloatVal(self) != __floatVal(aNumber)) ? true : false );
}
if (__isShortFloat(aNumber)) {
RETURN ( (__shortFloatVal(self) != __shortFloatVal(aNumber)) ? true : false );
}
%}.
^ self retry:#~= coercing:aNumber
! !
!ShortFloat methodsFor:'printing & storing'!
printString
"return a printed representation of the receiver"
%{ /* NOCONTEXT */
char buffer[64];
REGISTER char *cp;
OBJ s;
/*
* actually only needed on sparc: since thisContext is
* in a global register, which gets destroyed by printf,
* manually save it here - very stupid ...
*/
__BEGIN_PROTECT_REGISTERS__
#ifdef SYSV
sprintf(buffer, "%.6lg", (double)__shortFloatVal(self));
#else
sprintf(buffer, "%.6G", (double)__shortFloatVal(self));
#endif
__END_PROTECT_REGISTERS__
/*
* kludge to make integral float f prints as "f.0" (not as "f" as printf does)
* (i.e. look if string contains '.' or 'e' and append '.0' if not)
*/
for (cp = buffer; *cp; cp++) {
if ((*cp == '.') || (*cp == 'e')) break;
}
if (! *cp) {
*cp++ = '.';
*cp++ = '0';
*cp = '\0';
}
s = __MKSTRING(buffer COMMA_SND);
if (s != nil) {
RETURN (s);
}
%}.
"
memory allocation (for the new string) failed.
When we arrive here, there was no memory, even after a garbage collect.
This means, that the VM wanted to get some more memory from the
OS, which was not kind enough to give it.
Bad luck - you should increase the swap space on your machine.
"
^ ObjectMemory allocationFailureSignal raise.
! !
!ShortFloat methodsFor:'testing'!
isFinite
"return true, if the receiver is a finite float
i.e. not NaN and not infinite."
%{ /* NOCONTEXT */
double dV = (double) __shortFloatVal(self);
if (finite(dV)) { RETURN (true); }
%}.
^false
"
1.0 asShortFloat isFinite
(0.0 asShortFloat uncheckedDivide: 0.0) isFinite
(1.0 asShortFloat uncheckedDivide: 0.0) isFinite
"
!
isNaN
"return true, if the receiver is an invalid float (NaN - not a number).
These are not created by ST/X float operations (they raise an exception);
however, inline C-code could produce them ..."
%{ /* NOCONTEXT */
double dV = (double)(__shortFloatVal(self));
if (isnan(dV)) { RETURN (true); }
#if 0 /* Currently all our systems support isnan()
* If not, you have to fix librun/jinterpret.c also.
*/
/*
* sigh - every vendor is playing its own game here ...
* Q: what are standards worth, anyway ?
*/
#ifdef IS_NAN
if (IS_NAN(dV)) { RETURN (true); }
RETURN (false);
#endif
#ifdef IS_QNAN
if (IS_QNAN(dV)) { RETURN (true); }
RETURN (false);
#endif
#ifdef FLT_SNAN
if (dV == FLT_SNAN) { RETURN (true); }
RETURN (false);
#endif
#ifdef FLT_QNAN
if (dV == FLT_QNAN) { RETURN (true); }
RETURN (false);
#endif
#ifdef _SNANF
if (dV == _SNAN) { RETURN (true); }
RETURN (false);
#endif
#ifdef _QNANF
if (dV == _QNAN) { RETURN (true); }
RETURN (false);
#endif
#ifdef IsPosNAN
if IsPosNAN(dV) { RETURN (true); }
RETURN (false);
#endif
#ifdef IsNegNAN
if IsNegNAN(dV) { RETURN (true); }
RETURN (false);
#endif
#ifdef NAN
if (dV == NAN) { RETURN (true); }
RETURN (false);
#endif
#ifdef NaN
if (NaN(dV)) { RETURN (true); }
RETURN (false);
#endif
#endif /* 0 */
%}.
^ false
"
1.0 asShortFloat isNaN
(0.0 asShortFloat uncheckedDivide: 0.0) isNaN
"
!
negative
"return true if the receiver is less than zero"
%{ /* NOCONTEXT */
RETURN ( (__shortFloatVal(self) < 0.0) ? true : false );
%}
!
positive
"return true if the receiver is greater or equal to zero"
%{ /* NOCONTEXT */
RETURN ( (__shortFloatVal(self) >= 0.0) ? true : false );
%}
!
strictlyPositive
"return true if the receiver is greater than zero"
%{ /* NOCONTEXT */
RETURN ( (__shortFloatVal(self) > 0.0) ? true : false );
%}
! !
!ShortFloat class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/ShortFloat.st,v 1.26 1998-01-07 12:03:15 stefan Exp $'
! !