Math Libraries

This page is currently being updated to AmigaOS 4.x. Some of the information contained here may not yet be applicable in part or totally.

Math Libraries

This chapter describes the structure and calling sequences required to access the Motorola Fast Floating Point (FFP), the IEEE single-precision math libraries and the IEEE double-precision math libraries via the Amiga-supplied interfaces.

In its present state, the FFP library consists of three separate entities: the basic math library, the transcendental math library, and C and assembly-language interfaces to the basic math library plus FFP conversion functions. The IEEE single-precision, introduced in Release 2, and the double-precision libraries each presently consists of two entities: the basic math library and the transcendental math library.

Open Each Library Separately
Each Task using an IEEE math library must open the library itself. Library base pointers to these libraries may not be shared. Libraries can be context sensitive and may use the Task structure to keep track of the current context. Sharing of library bases by Tasks may seem to work in some systems. This is true for any of the IEEE math libraries.

Depending on the compiler used, it is not always necessary to explicitly call the library functions for basic floating point operations as adding, subtracting, dividing, etc. Consult the manual supplied with the compiler for information regarding the compiler options for floating point functions.

Math Libraries and Functions

There are six math libraries providing functions ranging from adding two floating point numbers to calculating a hyperbolic cosine. They are:

mathffp.library

the basic function library

mathtrans.library

the FFP transcendental math library

mathieeesingbas.library

the IEEE single-precision library

mathieesingtrans.library

the IEEE single-precision transcendental library

mathieeedoubbas.library

the IEEE double-precision library

mathieesingtrans.library

the IEEE double-precision transcendental library

FFP Floating Point Data Format

FFP floating-point variables are defined within C by the float or FLOAT directive. In assembly language they are simply defined by a DC.L/DS.L statement. All FFP floating-point variables are defined as 32-bit entities (longwords) with the following format:

 _____________________________________________
|                                             |
| MMMMMMMM    MMMMMMMM    MMMMMMMM    EEEEEEE |
| 31          23          15          7       |
|_____________________________________________|

The mantissa is considered to be a binary fixed-point fraction; except for 0, it is always normalized (the mantissa is shifted over and the exponent adjusted, so that the mantissa has a 1 bit in its highest position). Thus, it represents a value of less than 1 but greater than or equal to 1/2.

The sign bit is reset (0) for a positive value and set (1) for a negative value.

The exponent is the power of two needed to correctly position the mantissa to reflect the number's true arithmetic value. It is held in excess-64 notation, which means that the two's-complement values are adjusted upward by 64, thus changing $40 (-64) through $3F (+63) to $00 through $7F. This facilitates comparisons among floating-point values.

The value of 0 is defined as all 32 bits being 0s. The sign, exponent, and mantissa are entirely cleared. Thus, 0s are always treated as positive.

The range allowed by this format is as follows:

DECIMAL

9.22337177 * 10^18 > +VALUE > 5.42101070 * 10^-20

-9.22337177 * 10^18 < -VALUE < -2.71050535 * 10^-20

BINARY (HEXADECIMAL)

.FFFFFF * 2^63 > +VALUE > .800000 * 2^-63

-.FFFFFF * 2^63 < -VALUE < -.800000 * 2^-64

Remember that you cannot perform any arithmetic on these variables without using the fast floating-point libraries. The formats of the variables are incompatible with the arithmetic format of C-generated code; hence, all floating-point operations are performed through function calls.

FFP Basic Mathematics Library

The FFP basic math library contains entries for the basic mathematics functions such as add, subtract and divide. It resides in ROM and is opened by calling OpenLibrary() with "mathffp.library" as the argument.

#include <exec/types.h>
#include <libraries/mathffp.h>
 
#include <clib/mathffp_protos.h>
 
struct Library *MathBase;
 
VOID main()
{
if (MathBase = OpenLibrary("mathffp.library", 0))
    {
           . . .
 
    CloseLibrary(MathBase);
    }
else
    printf("Can't open mathffp.library\n");
}

The global variable MathBase is used internally for all future library references.

FFP Basic Functions

SPAbs() FLOAT SPAbs( FLOAT parm );

Take absolute value of FFP variable.

SPAdd() FLOAT SPAdd( FLOAT leftParm, FLOAT rightParm);

Add two FFP variables.

SPCeil() FLOAT SPCeil( FLOAT parm );

Computer largest integer less than or equal to variable.

SPCmp() LONG SPCmp( FLOAT leftParm, FLOAT rightParm)

Compare two FFP variables.

SPDiv() FLOAT SPDiv( FLOAT leftParm, FLOAT rightParm);

Divide two FFP variables.

SPFix() LONG SPFix( FLOAT parm );

Convert FFP variable to integer.

SPFloor() FLOAT SPFloor( FLOAT parm );

Compute least integer greater than or equal to variable.

SPFlt() FLOAT SPFlt( long integer );

Convert integer variable to FFP.

SPMul() FLOAT SPMul( FLOAT leftParm, FLOAT rightParm);

Multiply two FFP variables.

SPNeg() FLOAT SPNeg( FLOAT parm );

Take two's complement of FFP variable.

SPSub() FLOAT SPSub( FLOAT leftParm, FLOAT rightParm);

Subtract two FFP variables.

SPTst() LONG SPTst( FLOAT parm );

Test an FFP variable against zero.

Be sure to include the proper data type definitions shown below.

#include <exec/types.h>
#include <libraries/mathffp.h>
 
#include <clib/mathffp_protos.h>
 
struct Library *MathBase;
 
VOID main()
{
FLOAT f1, f2, f3;
LONG   i1;
 
if (MathBase = OpenLibrary("mathffp.library", 0))
    {
    i1 = SPFix(f1);            /* Call SPFix entry */
    f1 = SPFlt(i1);            /* Call SPFlt entry */
 
    if (SPCmp(f1,f2)) {};      /* Call SPCmp entry */
    if (!(SPTst(f1))) {};      /* Call SPTst entry */
 
    f1 = SPAbs(f2);            /* Call SPAbs entry */
    f1 = SPNeg(f2);            /* Call SPNeg entry */
    f1 = SPAdd(f2, f3);        /* Call SPAdd entry */
    f1 = SPSub(f2, f3);        /* Call SPSub entry */
    f1 = SPMul(f2, f3);        /* Call SPMul entry */
    f1 = SPDiv(f2, f3);        /* Call SPDiv entry */
    f1 = SPCeil(f2);           /* Call SPCeil entry */
    f1 = SPFloor(f2);          /* Call SPFloor entry */
 
    CloseLibrary(MathBase);
    }
else
    printf("Can't open mathffp.library\n");
}

The assembly language interface to the FFP basic math routines is shown below, including some details about how the system flags are affected by each operation. The access mechanism is:

MOVEA.L _MathBase,A6
JSR     _LVOSPFix(A6)

FFP Basic Assembly Functions

Function	Input	Output	Condition Codes
_LVOSPAbs	D0 = FFP argument	D0 = FFP absolute value	N = 0 Z = 1 if result is zero V = 0 C = undefined X = undefined
_LVOSPAdd	D1 = FFP argument 1 D0 = FFP addition	D0 = FFP addition of arg1 + arg2	N = 1 if result is negative Z = 1 if result is zero V = 1 if result overflowed C = undefined Z = undefined
_LVOSPCeil	D0 = FFP argument	D0 = least integer >= arg	N = 1 if result is negative Z = 1 if result is zero V = undefined C = undefined Z = undefined
_LVOSPCmp	D1 = FFP argument 1 D0 = FFP argument 2	D0 = +1 if arg1 > arg2 D0 = -1 if arg1 < arg2 D0 = 0 if arg1 = arg2	N = 0 Z = 1 if result is zero V = 0 C = undefined X = undefined GT = arg2 > arg1 GE = arg2 >= arg1 EQ = arg2 = arg1 NE = arg2 != arg1 LT = arg2 < arg1 LE = arg2 <= arg1
_LVOSPDiv	D1 = FFP argument 1 D0 = FFP argument 2	D0 = FFP division of arg2/arg1	N = 1 if result is negative Z = 1 if result is zero V = 1 if result overflowed C = undefined Z = undefined
_LVOSPFix	D0 = FFP argument	D0 = Integer (two's complement)	N = 1 if result is negative Z = 1 if result is zero V = 1 if overflow occurred C = undefined X = undefined
_LVOSPFloor	D0 = FFP argument	D0 = largest integer <= argument	N = 1 if result is negative Z = 1 if result is zero V = undefined C = undefined Z = undefined
_LVOSPFlt	D0 = Integer (two's complement)	D0 = FFP result	N = 1 if result is negative Z = 1 if result is zero V = 0 C = undefined X = undefined
_LVOSPMul	D0 = FFP argument 1 D1 = FFP argument 2	D0 = FFP multiplication of arg1 * arg2	N = 1 if result is negative Z = 1 if result is zero V = 1 if result overflowed C = undefined Z = undefined
_LVOSPNeg	D0 = FFP argument	D0 = FFP negated	N = 1 if result is negative Z = 1 if result is zero V = 0 C = undefined X = undefined
_LVOSPSub	D1 = FFP argument 1 D0 = FFP argument 2	D0 = FFP subtraction of arg2 - arg1	N = 1 if result is negative Z = 1 if result is zero V = 1 if result overflowed C = undefined Z = undefined
_LVOSPTst	D1 = FFP argument Note: This routine trashes the argument in D1.	D0 = +1 if arg > 0.0 D0 = -1 if arg < 0.0 D0 = 0 if arg = 0.0	N = 1 if result is negative Z = 1 if result is zero V = 0 C = undefined X = undefined EQ = arg = 0.0 NE = arg != 0.0 PL = arg >= 0.0 MI = arg < 0.0

FFP Transcendental Mathematics Library

The FFP transcendental math library contains entries for the transcendental math functions sine, cosine, and square root. It resides on disk and is opened by calling OpenLibrary() with "mathtrans.library" as the argument.

#include <exec/types.h>
#include <libraries/mathffp.h>
 
#include <clib/mathffp_protos.h>
#include <clib/mathtrans_protos.h>
 
struct Library *MathTransBase;
 
VOID main()
{
if (MathTransBase = OpenLibrary("mathtrans.library",0))
    {
            .
            .
            .
    CloseLibrary(MathTransBase);
    }
else
    printf("Can't open mathtrans.library\n");
}

The global variable MathTransBase is used internally for all future library references. Note that the transcendental math library is dependent upon the basic math library, which it will open if it is not open already. If you want to use the basic math functions in conjunction with the transcendental math functions however, you have to specifically open the basic math library yourself.

FFP Transcendental Functions

SPAsin() FLOAT SPAsin( FLOAT parm );

Return arcsine of FFP variable.

SPAcos() FLOAT SPAcos( FLOAT parm );

Return arccosine of FFP variable.

SPAtan() FLOAT SPAtan( FLOAT parm );

Return arctangent of FFP variable.

SPSin() FLOAT SPSin( FLOAT parm );

Return sine of FFP variable. This function accepts an FFP radian argument and returns the trigonometric sine value. For extremely large arguments where little or no precision would result, the computation is aborted and the "V" condition code is set. A direct return to the caller is made.

SPCos() FLOAT SPCos( FLOAT parm );

Return cosine of FFP variable. This function accepts an FFP radian argument and returns the trigonometric cosine value. For extremely large arguments where little or no precision would result, the computation is aborted and the "V" condition code is set. A direct return to the caller is made.

SPTan() FLOAT SPTan( FLOAT parm );

Return tangent of FFP variable. This function accepts an FFP radian argument and returns the trigonometric tangent value. For extremely large arguments where little or no precision would result, the computation is aborted and the "V" condition code is set. A direct return to the caller is made.

SPSincos() FLOAT SPSincos( FLOAT *cosResult, FLOAT parm);

Return sine and cosine of FFP variable. This function accepts an FFP radian argument and returns the trigonometric sine as its result and the trigonometric cosine in the first parameter. If both the sine and cosine are required for a single radian value, this function will result in almost twice the execution speed of calling the SPSin() and SPCos() functions independently. For extremely large arguments where little or no precision would result, the computation is aborted and the "V" condition code is set. A direct return to the caller is made.

SPSinh() FLOAT SPSinh( FLOAT parm );

Return hyperbolic sine of FFP variable.

SPCosh() FLOAT SPCosh( FLOAT parm );

Return hyperbolic cosine of FFP variable.

SPTanh() FLOAT SPTanh( FLOAT parm );

Return hyperbolic tangent of FFP variable.

SPExp() FLOAT SPExp( FLOAT parm );

Return e to the FFP variable power. This function accepts an FFP argument and returns the result representing the value of e (2.71828...) raised to that power.

SPLog() FLOAT SPLog( FLOAT parm );

Return natural log (base e) of FFP variable.

SPLog10() FLOAT SPLog10( FLOAT parm );

Return log (base 10) of FFP variable.

SPPow() FLOAT SPPow( FLOAT power, FLOAT arg );

Return FFP arg2 to FFP arg1.

SPSqrt() FLOAT SPSqrt( FLOAT parm );

Return square root of FFP variable.

SPTieee() FLOAT SPTieee( FLOAT parm );

Convert FFP variable to IEEE format

SPFieee() FLOAT SPFieee( FLOAT parm );

Convert IEEE variable to FFP format.

Be sure to include proper data type definitions, as shown in the example below.

#include <exec/types.h>
#include <libraries/mathffp.h>
 
#include <clib/mathffp_protos.h>
#include <clib/mathtrans_protos.h>
 
struct Library *MathTransBase;
 
VOID main()
{
FLOAT f1, f2, f3;
FLOAT i1;
 
if (MathTransBase = OpenLibrary("mathtrans.library",33))
    {
    f1 = SPAsin(f2);        /* Call SPAsin entry */
    f1 = SPAcos(f2);        /* Call SPAcos entry */
    f1 = SPAtan(f2);        /* Call SPAtan entry */
 
    f1 = SPSin(f2);         /* Call SPSin entry */
    f1 = SPCos(f2);         /* Call SPCos entry */
    f1 = SPTan(f2);         /* Call SPTan entry */
    f1 = SPSincos(&f3, f2); /* Call SPSincos entry */
 
    f1 = SPSinh(f2);        /* Call SPSinh entry */
    f1 = SPCosh(f2);        /* Call SPCosh entry */
    f1 = SPTanh(f2);        /* Call SPTanh entry */
 
    f1 = SPExp(f2);         /* Call SPExp entry */
    f1 = SPLog(f2);         /* Call SPLog entry */
    f1 = SPLog10(f2);       /* Call SPLog10 entry */
    f1 = SPPow(f2);         /* Call SPPow entry */
    f1 = SPSqrt(f2);        /* Call SPSqrt entry */
 
    i1 = SPTieee(f2);       /* Call SPTieee entry */
    f1 = SPFieee(i1);       /* Call SPFieee entry */
 
    CloseLibrary(MathTransBase);
    }
else
    printf("Can't open mathtrans.library\n");
}

The Amiga assembly language interface to the FFP transcendental math routines is shown below, including some details about how the system flags are affected by the operation. This interface resides in the library file amiga.lib and must be linked with the user code. Note that the access mechanism from assembly language is:

MOVEA.L _MathTransBase,A6
JSR     _LVOSPAsin(A6)

FFP Transcendental Assembly Functions

Function	Input	Output	Condition Codes
_LVOSPAsin	D0 = FFP argument	D0 = FFP arcsine radian	N = 0 Z = 1 if result is zero V = 0 C = undefined X = undefined
_LVOSPAcos	D0 = FFP argument	D0 = FFP arccosine radian	N = 0 Z = 1 if result is zero V = 1 if overflow occurred C = undefined X = undefined
_LVOSPAtan	D0 = FFP argument	D0 = FFP arctangent radian	N = 0 Z = 1 if result is zero V = 0 C = undefined X = undefined
_LVOSPSin	D0 = FFP argument in radians	D0 = FFP sine	N = 1 if result is negative Z = 1 if result is zero V = 1 if result is meaningless (that is, input magnitude too large) C = undefined X = undefined
_LVOSPCos	D0 = FFP argument in radians	D0 = FFP cosine	N = 1 if result is negative Z = 1 if result is zero V = 1 if result is meaningless (that is, input magnitude too large) C = undefined X = undefined
_LVOSPTan	D0 = FFP argument in radians	D0 = FFP tangent	N = 1 if result is negative Z = 1 if result is zero V = 1 if result is meaningless (that is, input magnitude too large) C = undefined X = undefined
_LVOSPSincos	D0 = FFP argument in radians D1 = Address to store cosine result	D0 = FFP sine (D1) = FFP cosine	N = 1 if result is negative Z = 1 if result is zero V = 1 if result is meaningless (that is, input magnitude too large) C = undefined X = undefined
_LVOSPSinh	D0 = FFP argument in radians	D0 = FFP hyperbolic sine	N = 1 if result is negative Z = 1 if result is zero V = 1 if overflow occurred C = undefined X = undefined
_LVOSPCosh	D0 = FFP argument in radians	D0 = FFP hyperbolic cosine	N = 1 if result is negative Z = 1 if result is zero V = 1 if overflow occurred C = undefined X = undefined
_LVOSPTanh	D0 = FFP argument in radians	D0 = FFP hyperbolic tangent	N = 1 if result is negative Z = 1 if result is zero V = 1 if overflow occurred C = undefined X = undefined
_LVOSPExp	D0 = FFP argument	D0 = FFP exponential	N = 0 Z = 1 if result is zero V = 1 if overflow occurred C = undefined Z = undefined
_LVOSPLog	D0 = FFP argument	D0 = FFP natural logarithm	N = 1 if result is negative Z = 1 if result is zero V = 1 if argument negative or zero C = undefined Z = undefined
_LVOSPLog10	D0 = FFP argument	D0 = FFP logarithm (base 10)	N = 1 if result is negative Z = 1 if result is zero V = 1 if argument negative or zero C = undefined Z = undefined
_LVOSPPow	D0 = FFP exponent value D1 = FFP argument value	D0 = FFP result of arg taken to exp power	N = 0 Z = 1 if result is zero V = 1 if result overflowed or arg < 0 C = undefined Z = undefined
_LVOSPSqrt	D0 = FFP argument	D0 = FFP square root	N = 0 Z = 1 if result is zero V = 1 if argument was negative C = undefined Z = undefined
_LVOSPTieee	D0 = FFP format argument	D0 = IEEE floating-point format	N = 1 if result is negative Z = 1 if result is zero V = undefined C = undefined Z = undefined
_LVOSPFieee	D0 = IEEE floating-point format argument	D0 = FFP format	N = undefined Z = 1 if result is zero V = 1 if result overflowed C = undefined Z = undefined

FFP Mathematics Conversion Library

The FFP mathematics conversion library provides functions to convert ASCII strings to their FFP equivalents and vice versa.

It is accessed by linking code into the executable file being created. The name of the file to include in the library description of the link command line is amiga.lib. When this is included, direct calls are made to the conversion functions. Only a C interface exists for the conversion functions; there is no assembly language interface. The basic math library is required in order to access these functions.

#include <exec/types.h>
#include <libraries/mathffp.h>
 
#include <clib/mathffp_protos.h>
 
struct Library *MathBase;
 
VOID main()
{
if (MathBase = OpenLibrary("mathffp.library", 33))
    {
           . . .
 
    CloseLibrary(MathBase);
    }
else
    printf("Can't open mathffp.library\n");
}

Math Support Functions

afp() FLOAT afp( BYTE *string );

Convert ASCII string into FFP equivalent.

arnd() VOID arnd( LONG place, LONG exp, BYTE *string);

Round ASCII representation of FFP number.

dbf() FLOAT dbf( ULONG exp, ULONG mant);

Convert FFP dual-binary number to FFP equivalent.

fpa() LONG fpa( FLOAT fnum, BYTE *string);

Convert FFP variable into ASCII equivalent.

Be sure to include proper data type definitions, as shown in the example below. Print statements have been included to help clarify the format of the math conversion function calls.

#include <exec/types.h>
#include <libraries/mathffp.h>
 
#include <clib/mathffp_protos.h>
#include <clib/alib_protos.h>
 
struct Library *MathBase;
 
UBYTE st1[80] = "3.1415926535897";
UBYTE st2[80] = "2.718281828459045";
UBYTE st3[80], st4[80];
 
VOID main()
{
FLOAT num1, num2;
FLOAT n1, n2, n3, n4;
LONG  exp1, exp2, exp3, exp4;
LONG  mant1, mant2, mant3, mant4;
LONG  place1, place2;
 
if (MathBase = OpenLibrary("mathffp.library", 33))
    {
 
    n1 = afp(st1);            /* Call afp entry */
    n2 = afp(st2);            /* Call afp entry */
    printf("\n\nASCII %s converts to floating point %f", st1, n1);
    printf("\nASCII %s converts to floating point %f", st2, n2);
 
    num1 = 3.1415926535897;
    num2 = 2.718281828459045;
 
    exp1 = fpa(num1, st3);    /* Call fpa entry */
    exp2 = fpa(num2, st4);    /* Call fpa entry */
    printf("\n\nfloating point %f converts to ASCII %s", num1, st3);
    printf("\nfloating point %f converts to ASCII %s", num2, st4);
 
    place1 = -2;
    place2 = -1;
    arnd(place1, exp1, st3);    /* Call arnd entry */
    arnd(place2, exp2, st4);    /* Call arnd entry */
    printf("\n\nASCII round of %f to %d places yields %s", num1, place1, st3);
    printf("\nASCII round of %f to %d places yields %s", num2, place2, st4);
 
    exp1  = -3;   exp2  = 3;    exp3  = -3;   exp4  = 3;
    mant1 = 12345;  mant2 = -54321;  mant3 = -12345; mant4 = 54321;
 
    n1 = dbf(exp1, mant1);        /* Call dbf entry */
    n2 = dbf(exp2, mant2);        /* Call dbf entry */
    n3 = dbf(exp3, mant3);        /* Call dbf entry */
    n4 = dbf(exp4, mant4);        /* Call dbf entry */
    printf("\n\ndbf of exp = %d and mant = %d yields FFP number of %f", exp1, mant1, n1);
    printf("\ndbf of exp = %d and mant = %d yields FFP number of %f", exp2, mant2, n2);
    printf("\ndbf of exp = %d and mant = %d yields FFP number of %f", exp3, mant3, n3);
    printf("\ndbf of exp = %d and mant = %d yields FFP number of %f", exp4, mant4, n4);
 
    CloseLibrary(MathBase);
    }
else
    printf("Can't open mathffp.library\n");
}

IEEE Single-Precision Data Format

The IEEE single-precision variables are defined as 32-bit entities with the following format:

 ______________________________________________
|                                              |
| SEEEEEEE    MMMMMMMM    MMMMMMMM    MMMMMMMM |
| 31          23          15          7        |
|______________________________________________|

Hidden Bit In The Mantissa
There is a "hidden" bit in the mantissa part of the IEEE numbers. Since all numbers are normalized, the integer (high) bit of the mantissa is dropped off. The IEEE single-precision range is 1.3E-38 (1.4E-45 de-normalized) to 3.4E+38.

The exponent is the power of two needed to correctly position the mantissa to reflect the number's true arithmetic value. If both the exponent and the mantissa have zero in every position, the value is zero. If only the exponent has zero in every position, the value is an unnormal (extremely small). If all bits of the exponent are set to 1 the value is either a positive or negative infinity or a Not a Number (NaN). NaN is sometimes used to indicate an uninitialized variable.

IEEE Single-Precision Basic Math Library

The ROM-based IEEE single-precision basic math library was introduced in V36. This library contains entries for the basic IEEE single-precision mathematics functions, such as add, subtract, and divide.

The library is opened by making calling OpenLibrary() with "mathieeesingbas.library" as the argument. Do not share the library base pointer between tasks - see note at beginning of chapter for details.

#include <exec/types.h>
#include <libraries/mathieeesp.h>
 
#include <clib/mathsingbas_protos.h>
 
struct Library *MathIeeeSingBasBase;
 
VOID main()
{
    /* do not share base pointer between tasks. */
if (MathIeeeSingBasBase = OpenLibrary("mathieeesingbas.library", 37))
    {
           .
           .
           .
    CloseLibrary(MathIeeeSingBasBase);
    }
else
    printf("Can't open mathieeesingbas.library\n");
}

The global variable MathIeeeSingBasBase is used internally for all future library references.

If an 680x0/68881/68882 processor combination is available, it will be used by the IEEE single-precision basic library instead of the software emulation. Also, if an autoconfigured math resource is available, that will be used. Typically this is a 68881 designed as a 16 bit I/O port, but it could be another device as well.

SP IEEE Basic Functions (V36 or greater)

IEEESPAbs() FLOAT ( FLOAT parm );

Take absolute value of IEEE single-precision variable.

IEEESPAdd() FLOAT IEEESPAdd( FLOAT leftParm, FLOAT rightParm);

Add two IEEE single-precision variables.

IEEESPCeil() FLOAT IEEESPCeil( FLOAT parm );

Compute least integer greater than or equal to variable.

IEEESPCmp() LONG IEEESPCmp( FLOAT leftParm, FLOAT rightParm );

Compare two IEEE single-precision variables.

IEEESPDiv() FLOAT IEEESPDiv( FLOAT dividend, FLOAT divisor );

Divide two IEEE single-precision variables.

IEEESPFix() LONG IEEESPFix( FLOAT parm );

Convert IEEE single-precision variable to integer.

IEEESPFloor() FLOAT IEEESPFloor( FLOAT parm );

Compute largest integer less than or equal to variable.

IEEESPFlt() FLOAT IEEESPFlt( long integer );

Convert integer variable to IEEE single-precision.

IEEESPMul() FLOAT IEEESPMul( FLOAT leftParm, FLOAT rightParm );

Multiply two IEEE single-precision variables.

IEEESPNeg() FLOAT IEEESPNeg( FLOAT parm );

Take two's complement of IEEE single-precision variable.

IEEESPSub() FLOAT IEEESPSub( FLOAT leftParm, FLOAT rightParm );

Subtract two IEEE single-precision variables.

IEEESPTst() LONG IEEESPTst( FLOAT parm );

Test an IEEE single-precision variable against zero.

Be sure to include proper data type definitions, as shown in the example below.

#include <exec/types.h>
#include <libraries/mathieeesp.h>
 
#include <clib/mathsingbas_protos.h>
 
struct Library *MathIeeeSingBasBase;
 
VOID main()
{
FLOAT f1, f2, f3;
LONG   i1;
 
if (MathIeeeSingBasBase = OpenLibrary("mathieeesingbas.library",37))
    {
    i1 = IEEESPFix(f1);                /* Call IEEESPFix entry */
    fi = IEEESPFlt(i1);                /* Call IEEESPFlt entry */
    switch (IEEESPCmp(f1, f2)) {};     /* Call IEEESPCmp entry */
    switch (IEEESPTst(f1)) {};         /* Call IEEESPTst entry */
    f1 = IEEESPAbs(f2);                /* Call IEEESPAbs entry */
    f1 = IEEESPNeg(f2);                /* Call IEEESPNeg entry */
    f1 = IEEESPAdd(f2, f3);            /* Call IEEESPAdd entry */
    f1 = IEEESPSub(f2, f3);            /* Call IEEESPSub entry */
    f1 = IEEESPMul(f2, f3);            /* Call IEEESPMul entry */
    f1 = IEEESPDiv(f2, f3);            /* Call IEEESPDiv entry */
    f1 = IEEESPCeil(f2);               /* Call IEEESPCeil entry */
    f1 = IEEESPFloor(f2);              /* Call IEEESPFloor entry */
 
    CloseLibrary(MathIeeeSingBasBase);
    }
else
    printf("Can't open mathieeesingbas.library\n");
}

The Amiga assembly language interface to the IEEE single-precision basic math routines is shown below, including some details about how the system flags are affected by each operation. Note that the access mechanism from assembly language is as shown below:

MOVEA.L _MathIeeeSingBasBase,A6
JSR     _LVOIEEESPFix(A6)

SP IEEE Basic Assembly Functions

Function	Input	Output	Condition Codes
_LVOIEEESPFix	D0 = IEEE double-precision argument	D0 = Integer (two's complement)	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPFlt	D0 = Integer argument (two's complement)	D0 = IEEE single-precision	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPCmp	D0 = IEEE single-precision argument 1 D1 = IEEE single-precision argument 2	D0 = +1 if arg1 > arg2 D0 = -1 if arg1 < arg2 D0 = 0 if arg1 = arg2	N = 1 if result is negative Z = 1 if result is zero V = 0 C = undefined X = undefined GT = arg2 > arg1 GE = arg2 >= arg1 EQ = arg2 = arg1 NE = arg2 != arg1 LT = arg2 < arg1 E= arg2 <= arg1
_LVOIEEESPTst	D0 = IEEE single-precision argument	D0 = +1 if arg > 0.0 D0 = -1 if arg < 0.0 D0 = 0 if arg = 0.0	N = 1 if result is negative Z = 1 if result is zero V = 0 C = undefined X = undefined EQ = arg = 0.0 NE = arg != 0.0 PL = arg >= 0.0 MI = arg < 0.0
_LVOIEEESPAbs	D0 = IEEE single-precision argument	D0 = IEEE single-precision absolute value	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPNeg	D0 = IEEE single-precision argument	D0 = IEEE single-precision negated	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPAdd	D0 = IEEE single-precision argument 1 D1 = IEEE single-precision argument 2	D0 = IEEE single-precision addition of arg1+arg2	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPSub	D0 = IEEE single-precision argument 1 D1 = IEEE single-precision argument 2	D0 = IEEE single-precision subtraction of arg1-arg2	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPMul	D0 = IEEE single-precision argument 1 D1 = IEEE single-precision argument 2	D0 = IEEE single-precision multiplication of arg1 * arg2	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPDiv	D0 = IEEE single-precision argument 1 D1 = IEEE single-precision argument 2	D0 = IEEE single-precision division of arg1/arg2	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPCeil	D0 = IEEE single-precision variable	D0 = least integer >= variable	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPFloor	D0 = IEEE single-precision variable	D0 = largest integer <= argument	N = undefined Z = undefined V = undefined C = undefined X = undefined

IEEE Single-Precision Transcendental Math Library

The IEEE single-precision transcendental math library was introduced in V36. It contains entries for transcendental math functions such as sine, cosine, and square root.

This library resides on disk and is opened by calling OpenLibrary() with "mathieeesingtrans.library" as the argument. Do not share the library base pointer between tasks - see note at beginning of chapter.

#include <exec/types.h>
#include <libraries/mathieeesp.h>
 
struct Library *MathIeeeSingTransBase;
 
#include <clib/mathsingtrans_protos.h>
 
VOID main()
{
if (MathIeeeSingTransBase = OpenLibrary("mathieeesingtrans.library",37))
    {
           . . .
 
    CloseLibrary(MathIeeeSingTransBase);
    }
else  printf("Can't open mathieeesingtrans.library\n");
}

The global variable MathIeeeSingTransBase is used internally for all future library references.

The IEEE single-precision transcendental math library is dependent upon the IEEE single-precision basic math library, which it will open if it is not open already. If you want to use the IEEE single-precision basic math functions in conjunction with the transcendental math functions however, you have to specifically open the basic math library yourself.

Just as the IEEE single-precision basic math library, the IEEE single-precision transcendental math library will take advantage of a 680x0/68881 combination or another math resource, if present.

SP IEEE Transcendental Functions (V36 or greater)

IEEESPAsin() FLOAT IEEESPAsin( FLOAT parm );

Return arcsine of IEEE single-precision variable.

IEEESPAcos() FLOAT IEEESPAcos( FLOAT parm );

Return arccosine of IEEE single-precision variable.

IEEESPAtan() FLOAT IEEESPAtan( FLOAT parm );

Return arctangent of IEEE single-precision variable.

IEEESPSin() FLOAT IEEESPSin( FLOAT parm );

Return sine of IEEE single-precision variable. This function accepts an IEEE radian argument and returns the trigonometric sine value.

IEEESPCos() FLOAT IEEESPCos( FLOAT parm );

Return cosine of IEEE single-precision variable. This function accepts an IEEE radian argument and returns the trigonometric cosine value.

IEEESPTan() FLOAT IEEESPTan( FLOAT parm );

Return tangent of IEEE single-precision variable. This function accepts an IEEE radian argument and returns the trigonometric tangent value.

IEEESPSincos() FLOAT IEEESPSincos( FLOAT *cosptr, FLOAT parm );

Return sine and cosine of IEEE single-precision variable. This function accepts an IEEE radian argument and returns the trigonometric sine as its result and the cosine in the first parameter.

IEEESPSinh() FLOAT IEEESPSinh( FLOAT parm );

Return hyperbolic sine of IEEE single-precision variable.

IEEESPCosh() FLOAT IEEESPCosh( FLOAT parm );

Return hyperbolic cosine of IEEE single-precision variable.

IEEESPTanh() FLOAT IEEESPTanh( FLOAT parm );

Return hyperbolic tangent of IEEE single-precision variable.

IEEESPExp() FLOAT IEEESPExp( FLOAT parm );

Return e to the IEEE variable power. This function accept an IEEE single-precision argument and returns the result representing the value of e (2.712828...) raised to that power.

IEEESPFieee() FLOAT IEEESPFieee( FLOAT parm );

Convert IEEE single-precision number to IEEE single-precision number. The only purpose of this function is to provide consistency with the double-precision math IEEE library.

IEEESPLog() FLOAT IEEESPLog( FLOAT parm );

Return natural log (base e of IEEE single-precision variable.

IEEESPLog10() FLOAT IEEESPLog10( FLOAT parm );

Return log (base 10) of IEEE single-precision variable.

IEEESPPow() FLOAT IEEESPPow( FLOAT exp, FLOAT arg );

Return IEEE single-precision arg2 to IEEE single-precision arg1.

IEEESPSqrt() FLOAT IEEESPSqrt( FLOAT parm );

Return square root of IEEE single-precision variable.

IEEESPTieee() FLOAT IEEESPTieee( FLOAT parm );

Convert IEEE single-precision number to IEEE single-precision number. The only purpose of this function is to provide consistency with the double-precision math IEEE library.

Be sure to include the proper data type definitions as shown below.

#include <exec/types.h>
#include <libraries/mathieeesp.h>
 
#include <clib/mathsingtrans_protos.h>
 
struct Library *MathIeeeSingTransBase;
 
VOID main()
{
FLOAT f1, f2, f3;
 
if (MathIeeeSingTransBase = OpenLibrary("mathieeesingtrans.library",37))
    {
    f1 = IEEEDPAsin(f2);        /* Call IEEESPAsin entry */
    f1 = IEEEDPAcos(f2);        /* Call IEEESPAcos entry */
    f1 = IEEEDPAtan(f2);        /* Call IEEESPAtan entry */
    f1 = IEEEDPSin(f2);         /* Call IEEESPSin entry */
    f1 = IEEEDPCos(f2);         /* Call IEEESPCos entry */
    f1 = IEEEDPTan(f2);         /* Call IEEESPTan entry */
    f1 = IEEEDPSincos(&f3, f2); /* Call IEEESPSincos entry */
    f1 = IEEEDPSinh(f2);        /* Call IEEESPSinh entry */
    f1 = IEEEDPCosh(f2);        /* Call IEEESPCosh entry */
    f1 = IEEEDPTanh(f2);        /* Call IEEESPTanh entry */
    f1 = IEEEDPExp(f2);         /* Call IEEESPExp entry */
    f1 = IEEEDPLog(f2);         /* Call IEEESPLog entry */
    f1 = IEEEDPLog10(f2);       /* Call IEEESPLog10 entry */
    f1 = IEEEDPPow(d2, f3);     /* Call IEEESPPow entry */
    f1 = IEEEDPSqrt(f2);        /* Call IEEESPSqrt entry */
 
    CloseLibrary(MathIeeeSingTransBase);
    }
else printf("Can't open mathieeesingtrans.library\n");
}

The section below describes the Amiga assembly interface to the IEEE single-precision transcendental math library. The access mechanism from assembly language is:

MOVEA.L _MathIeeeSingTransBase,A6
JSR     _LVOIEEESPAsin(A6)

SP IEEE Transcendental Assembly Functions

Function	Input	Output	Condition Codes
_LVOIEEESPAsin	D0 = IEEE argument	D0 = IEEE arcsine radian	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPAcos	D0 = IEEE single-precision argument	D0 = IEEE arccosine radian	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPAtan	D0 = IEEE single-precision argument	D0 = IEEE arctangent radian	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPSin	D0 = IEEE single-precision argument in radians	D0 = IEEE sine	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPCos	D0 = IEEE single-precision argument in radians	D0 = IEEE cosine	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPTan	D0 = IEEE single-precision argument in radians	D0 = IEEE tangent	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPSincos	A0 = Address to store cosine result D0 = IEEE argument in radians	D0 = IEEE sine (A0) = IEEE cosine	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPSinh	D0 = IEEE single-precision argument in radians	D0 = IEEE hyperbolic sine	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPCosh	D0 = IEEE single-precision argument in radians	D0 = IEEE hyperbolic cosine	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPTanh	D0 = IEEE single-precision argument in radians	D0 = IEEE hyperbolic tangent	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPExp	D0 = IEEE single-precision argument	D0 = IEEE exponential	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPLog	D0 = IEEE single-precision argument	D0 = IEEE natural logarithm	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPLog10	D0 = IEEE single-precision argument	D0 = IEEE logarithm (base 10)	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPPow	D0 = IEEE single-precision exponent value D1 = IEEE single-precision argument value	D0 = IEEE result of arg taken to exp power	N = undefined Z = undefined V = undefined C = undefined X = undefined
_LVOIEEESPSqrt	D0 = IEEE single-precision argument	D0 = IEEE square root	N = undefined Z = undefined V = undefined C = undefined X = undefined

IEEE Double-Precision Data Format

The IEEE double-precision variables are defined as 64-bit entities with the following format:

 ______________________________________________
|                                              |
| SEEEEEEE    EEEEEIMM    MMMMMMMM    MMMMMMMM |
| 63          55          47          39       |
|______________________________________________|

 ______________________________________________
|                                              |
| MMMMMMMM    MMMMMMMM    MMMMMMMM    MMMMMMMM |
| 31          23          15          7        |
|______________________________________________|

Hidden Bit In The Mantissa
There is a "hidden" bit in the mantissa part of the IEEE numbers. Since all numbers are normalized, the integer (high) bit of the mantissa is dropped off. The IEEE double-precision range is 2.2E-308 (4.9E-324 de-normalized) to 1.8E+307.

The exponent is the power of two needed to correctly position the mantissa to reflect the number's true arithmetic value. If both the exponent and the mantissa have zero in every position, the value is zero. If only the exponent has zero in every position, the value is an unnormal (extremely small). If all bits of the exponent are set to 1 the value is either a positive or negative infinity or a Not a Number (NaN). NaN is sometimes used to indicate an uninitialized variable.

IEEE Double-Precision Basic Math Library

The IEEE double-precision basic math library contains entries for the basic IEEE mathematics functions, such as add, subtract, and divide. This library resides on disk and is opened by calling OpenLibrary() with "mathieeedoubbas.library" as the argument. Do not share the library base pointer between tasks - see note at beginning of chapter for details.

#include <exec/types.h>
#include <libraries/mathieeedp.h>
 
#include <clib/mathdoubbas_protos.h>
 
struct Library *MathIeeeDoubBasBase;
 
VOID main()
{
    /* do not share base pointer between tasks. */
if (MathIeeeDoubBasBase = OpenLibrary("mathieeedoubbas.library", 34))
    {
           . . .
 
    CloseLibrary(MathIeeeDoubBasBase);
    }
else printf("Can't open mathieeedoubbas.library\n");
}

The global variable MathIeeeDoubBasBase is used internally for all future library references.

If an 680x0/68881/68882 processor combination is available, it will be used by the IEEE basic library instead of the software emulation. Also, if an autoconfigured math resource is available, that will be used. Typically this is a 68881 designed as a 16 bit I/O port, but it could be another device as well.

DP IEEE Basic Functions

IEEEDPAbs() DOUBLE IEEEDPAbs( DOUBLE parm );

Take absolute value of IEEE double-precision variable.

IEEEDPAdd() DOUBLE IEEEDPAdd( DOUBLE leftParm, DOUBLE rightParm );

Add two IEEE double-precision variables.

IEEEDPCeil() DOUBLE IEEEDPCeil( DOUBLE parm );

Compute least integer greater than or equal to variable.

IEEEDPCmp() LONG IEEEDPCmp( DOUBLE leftParm, DOUBLE rightParm );

Compare two IEEE double-precision variables.

IEEEDPDiv() DOUBLE IEEEDPDiv( DOUBLE dividend, DOUBLE divisor );

Divide two IEEE double-precision variables.

IEEEDPFix() LONG IEEEDPFix( DOUBLE parm );

Convert IEEE double-precision variable to integer.

IEEEDPFloor() DOUBLE IEEEDPFloor( DOUBLE parm );

Compute largest integer less than or equal to variable.

IEEEDPFlt() DOUBLE IEEEDPFlt( long integer );

Convert integer variable to IEEE double-precision.

IEEEDPMul() DOUBLE IEEEDPMul( DOUBLE factor1, DOUBLE factor2 );

Multiply two IEEE double-precision variables.

IEEEDPNeg() DOUBLE IEEEDPNeg( DOUBLE parm );

Take two's complement of IEEE double-precision variable.

IEEEDPSub() DOUBLE IEEEDPSub( DOUBLE leftParm, DOUBLE rightParm );

Subtract two IEEE double-precision variables.

IEEEDPTst() LONG IEEEDPTst( DOUBLE parm );

Test an IEEE double-precision variable against zero.

Be sure to include proper data type definitions, as shown in the example below.

#include <exec/types.h>
#include <libraries/mathieeedp.h>
 
#include <clib/mathieeedoubbas_protos.h>
 
struct Library *MathIeeeDoubBasBase;
 
VOID main()
{
DOUBLE d1, d2, d3;
LONG   i1;
 
if (MathIeeeDoubBasBase = OpenLibrary("mathieeedoubbas.library",34))
    {
 
    i1 = IEEEDPFix(d1);                /* Call IEEEDPFix entry */
    fi = IEEEDPFlt(i1);                /* Call IEEEDPFlt entry */
    switch (IEEEDPCmp(d1, d2)) {};     /* Call IEEEDPCmp entry */
    switch (IEEEDPTst(d1)) {};         /* Call IEEEDPTst entry */
    d1 = IEEEDPAbs(d2);                /* Call IEEEDPAbs entry */
    d1 = IEEEDPNeg(d2);                /* Call IEEEDPNeg entry */
    d1 = IEEEDPAdd(d2, d3);            /* Call IEEEDPAdd entry */
    d1 = IEEEDPSub(d2, d3);            /* Call IEEEDPSub entry */
    d1 = IEEEDPMul(d2, d3);            /* Call IEEEDPMul entry */
    d1 = IEEEDPDiv(d2, d3);            /* Call IEEEDPDiv entry */
    d1 = IEEEDPCeil(d2);               /* Call IEEEDPCeil entry */
    d1 = IEEEDPFloor(d2);              /* Call IEEEDPFloor entry */
 
    CloseLibrary(MathIeeeDoubBasBase);
    }
else printf("Can't open mathieeedoubbas.library\n");
}

The Amiga assembly language interface to the IEEE double-precision floating-point basic math routines is shown below, including some details about how the system flags are affected by each operation. The access mechanism from assembly language is:

MOVEA.L _MathIeeeDoubBasBase,A6
JSR     _LVOIEEEDPFix(A6)

DP IEEE Basic Assembly Functions

<thead> </thead> <tbody> </tbody>

Function	Input	Output	Condition Codes
_LVOIEEEDPFix	D0/D1 = IEEE	D0 = Integer	N = undefined
	double-precision	(two’s complement)	Z = undefined
	argument		V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPFl	D0 = Integer (two’s	D0/D1 = IEEE	N = undefined
	complement) argument	double-precision	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPCmp	D0/D1 = IEEE	D0 = +1 if arg1 <math>></math> arg2	N = 1 if result is negative
	double-precision	D0 = -1 if arg1 <math><</math> arg2	Z = 1 if result is zero
	argument 1	D0 = 0 if arg1 = arg2	V = 0
	D2/D3 = IEEE		C = undefined
	double-precision		X = undefined
	argument 2		GT = arg2 <math>></math> arg1
			GE = arg2 <math>\ge</math> arg1
			EQ = arg2 = arg1
			NE = arg2 <math>\not=</math> arg1
			LT = arg2 <math><</math> arg1
			LE = arg2 <math>\le</math> arg1
_LVOIEEEDPTst	D0/D1 = IEEE	D0 = +1 if arg <math>></math> 0.0	N = 1 if result is negative
	double-precision	D0 = -1 if arg <math><</math> 0.0	Z = 1 if result is zero
	argument	D0 = 0 if arg = 0.0	V = 0
			C = undefined
			X = undefined
			EQ = arg = 0.0
			NE = arg <math>\not=</math> 0.0
			PL = arg <math>\ge</math> 0.0
			MI = arg <math><</math> 0.0
_LVOIEEEDPAbs	D0/D1 = IEEE double-	D0/D1 = IEEE double-precision	N = undefined
	precision argument	absolute value	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPNeg	D0/D1 = IEEE double-	D0/D1 = IEEE double-precision	N = undefined
	precision argument	negated	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPAdd	D0/D1 = IEEE double-	D0/D1 = IEEE double-precision	N = undefined
	precision argument 1	addition of arg1+arg2	Z = undefined
			V = undefined
	D2/D3 = IEEE double-		C = undefined
	precision argument 2		X = undefined
_LVOIEEEDPSub	D0/D1 = IEEE double-	D0/D1 = IEEE double-precision	N = undefined
	precision argument 1	subtraction of arg1-arg2	Z = undefined
			V = undefined
	D2/D3 = IEEE double-		C = undefined
	precision argument 2		X = undefined
_LVOIEEEDPMul	D0/D1 = IEEE double-	D0/D1 = IEEE double-precision	N = undefined
	precision argument 1	multiplication of arg1<math>\times</math>arg2	Z = undefined
			V = undefined
	D2/D3 = IEEE double-		C = undefined
	precision argument 2		X = undefined

DP IEEE Basic Assembly Functions (continued)

<thead> </thead> <tbody> </tbody>

Function	Input	Output	Condition Codes
_LVOIEEEDPDiv	D0/D1 = IEEE double-	D0/D1 = IEEE double-precision	N = undefined
	precision argument 1	division of arg1/arg2	Z = undefined
			V = undefined
	D2/D3 = IEEE double-		C = undefined
	precision argument 2		X = undefined
_LVOIEEEDPCeil	D0/D1 = IEEE double-	D0/D1 = least integer	N = undefined
	precision argument	<math>\ge</math> argument	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPFloor	D0/D1 = IEEE double-	D0/D1 = largest integer	N = undefined
	precision argument	<math>\le</math> argument	Z = undefined
			V = undefined
			C = undefined
			X = undefined

IEEE Double-Precision Transcendental Math Library

The IEEE double-precision transcendental math library contains entries for the transcendental math functions such as sine, cosine, and square root. The library resides on disk and is opened by calling OpenLibrary() with "mathieeedoubtrans.library" as the argument. Do not share the library base pointer between tasks – see note at beginning of chapter for details.

#include <exec/types.h>
#include <libraries/mathieeedp.h>

#include <clib/mathdoubtrans_protos.h>

struct Library *MathIeeeDoubTransBase;

VOID main()
{
if (MathIeeeDoubTransBase = OpenLibrary("mathieeedoubtrans.library",34))
    {
           . . .

    CloseLibrary(MathIeeeDoubTransBase);
    }
else printf("Can't open mathieeedoubtrans.library\n");
}

The global variable MathIeeeDoubTransBase is used internally for all future library references.

The IEEE double-precision transcendental math library is dependent upon the IEEE double-precision basic math library, which it will open if it is not open already. If you want to use the IEEE double-precision basic math functions in conjunction with the transcendental math functions however, you have to specifically open the basic math library yourself.

Just as the IEEE double-precision basic math library, the IEEE double-precision transcendental math library will take advantage of a 680x0/68881 combination or another math resource, if present.

DP IEEE Transcendental Functions

Return arcsine of IEEE variable.

Return arccosine of IEEE variable.

Return arctangent of IEEE variable.

Return sine of IEEE variable. This function accepts an IEEE radian argument and returns the trigonometric sine value.

Return cosine of IEEE variable. This function accepts an IEEE radian argument and returns the trigonometric cosine value.

Return tangent of IEEE variable. This function accepts an IEEE radian argument and returns the trigonometric tangent value.

Return sine and cosine of IEEE variable. This function accepts an IEEE radian argument and returns the trigonometric sine as its result and the trigonometric cosine in the first parameter.

Return hyperbolic sine of IEEE variable.

Return hyperbolic cosine of IEEE variable.

Return hyperbolic tangent of IEEE variable.

Return e to the IEEE variable power. This function accept an IEEE argument and returns the result representing the value of e (2.712828<math>\ldots</math>) raised to that power.

Convert IEEE single-precision number to IEEE double-precision number.

Return natural log (base e of IEEE variable.

Return log (base 10) of IEEE variable.

Return IEEE arg2 to IEEE arg1.

Return square root of IEEE variable.

Convert IEEE double-precision number to IEEE single-precision number.

Be sure to include proper data type definitions as shown below.

#include <exec/types.h>
#include <libraries/mathieeedp.h>
#include <clib/mathdoubtrans_protos.h>

struct Library *MathIeeeDoubTransBase;

VOID main()
{
DOUBLE d1, d2, d3;
FLOAT f1;

if (MathIeeeDoubTransBase = OpenLibrary("mathieeedoubtrans.library",34))
    {
    d1 = IEEEDPAsin(d2);        /* Call IEEEDPAsin entry */
    d1 = IEEEDPAcos(d2);        /* Call IEEEDPAcos entry */
    d1 = IEEEDPAtan(d2);        /* Call IEEEDPAtan entry */
    d1 = IEEEDPSin(d2);         /* Call IEEEDPSin entry */
    d1 = IEEEDPCos(d2);         /* Call IEEEDPCos entry */
    d1 = IEEEDPTan(d2);         /* Call IEEEDPTan entry */
    d1 = IEEEDPSincos(&d3, d2); /* Call IEEEDPSincos entry */
    d1 = IEEEDPSinh(d2);        /* Call IEEEDPSinh entry */
    d1 = IEEEDPCosh(d2);        /* Call IEEEDPCosh entry */
    d1 = IEEEDPTanh(d2);        /* Call IEEEDPTanh entry */
    d1 = IEEEDPExp(d2);         /* Call IEEEDPExp entry */
    d1 = IEEEDPLog(d2);         /* Call IEEEDPLog entry */
    d1 = IEEEDPLog10(d2);       /* Call IEEEDPLog10 entry */
    d1 = IEEEDPPow(d2, d3);     /* Call IEEEDPPow entry */
    d1 = IEEEDPSqrt(d2);        /* Call IEEEDPSqrt entry */
    f1 = IEEEDPTieee(d2);       /* Call IEEEDPTieee entry */
    d1 = IEEEDPFieee(f1);       /* Call IEEEDPFieee entry */

    CloseLibrary(MathIeeeDoubTransBase);
    }
else printf("Can't open mathieeedoubtrans.library\n");
}

The section below describes the Amiga assembly interface to the IEEE double-precision transcendental math library. The access mechanism from assembly language is:

MOVEA.L _MathIeeeDoubTransBase,A6
JSR     _LVOIEEEDPAsin(A6)

DP IEEE Transcendental Assembly Functions

<thead> </thead> <tbody> </tbody>

Function	Input	Output	Condition Codes
_LVOIEEEDPAsin	D0/D1 = IEEE argument	D0/D1 = IEEE	N = undefined
		arcsine radian	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPAcos	D0/D1 = IEEE argument	D0/D1 = IEEE	N = undefined
		arccosine radian	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPAtan	D0/D1 = IEEE	D0/D1 = IEEE arctangent	N = undefined
	argument	radian	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPSin	D0/D1 = IEEE	D0/D1 = IEEE sine	N = undefined
	argument in		Z = undefined
	radians		V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPCos	D0/D1 = IEEE	D0/D1 = IEEE cosine	N = undefined
	argument in		Z = undefined
	radians		V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPTan	D0/D1 = IEEE	D0/D1 = IEEE tangent	N = undefined
	argument in		Z = undefined
	radians		V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPSincos	A0 = Address to	D0/D1 = IEEE sine	N = undefined
	store cosine	(A0) = IEEE cosine	Z = undefined
	result		V = undefined
	D0/D1 = IEEE		C = undefined
	argument in radians		X = undefined
_LVOIEEEDPSin	D0/D1 = IEEE argument	D0/D1 = IEEE hyperbolic	N = undefined
	in radians	sine	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPCosh	D0/D1 = IEEE argument	D0/D1 = IEEE hyperbolic	N = undefined
	in radians	cosine	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPTanh	D0/D1 = IEEE argument	D0/D1 = IEEE hyperbolic	N = undefined
	in radians	tangent	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPExp	D0/D1 = IEEE argument	D0/D1 = IEEE exponential	N = undefined
			Z = undefined
			V = undefined
			C = undefined
			X = undefined

DP IEEE Transcendental Assembly Functions (continued)

<thead> </thead> <tbody> </tbody>

Function	Input	Output	Condition Codes
_LVOIEEEDPLog	D0/D1 = IEEE argument	D0/D1 = IEEE natural	N = undefined
		logarithm	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPLog10	D0/D1 = IEEE argument	D0/D1 = IEEE logarithm	N = undefined
		(base 10)	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPPow	D0/D1 = IEEE exponent	D0/D1 = IEEE result of	N = undefined
	D2/D3 = IEEE argument	arg taken to exp power	Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPSqrt	D0/D1 = IEEE argument	D0/D1 = IEEE square root	N = undefined
			Z = undefined
			V = undefined
			C = undefined
			X = undefined
_LVOIEEEDPTieee	D0/D1 = IEEE format	D0 = single-precision	N = undefined
	argument	IEEE floating-point	Z = undefined
		format	V = undefined
			C = undefined
			X = undefined

Function Reference

Here's a brief summary of the functions covered in this chapter. Refer to the SDK for additional information.

FFP Basic Functions

Function	Description
SPAbs()	Take absolute value of FFP variable
SPAdd()	Add two FFP variables
SPCeil()	Compute least integer greater than or equal to variable.
SPCmp()	Compare two FFP variables
SPDiv()	Divide two FFP variables
SPFix()	Convert FFP variable to integer
SPFloor()	Computer largest integer less than or equal to variable.
SPFlt()	Convert integer variable to FFP
SPMul()	Multiply two FFP variables
SPNeg()	Take two’s complement of FFP variable
SPSub()	Subtract two FFP variables
SPTst()	Test an FFP variable against zero

FFP Transcendental Functions

Function	Description
SPAcos()	Return arccosine of FFP variable.
SPAsin()	Return arcsine of FFP variable.
SPAtan()	Return arctangent of FFP variable.
SPCos()	Return cosine of FFP variable.
SPCosh()	Return hyperbolic cosine of FFP variable.
SPExp()	Return e to the FFP variable power.
SPFieee()	Convert IEEE variable to FFP format.
SPLog()	Return natural log (base e) of FFP variable.
SPLog10()	Return log (base 10) of FFP variable.
SPPow()	Return FFP arg2 to FFP arg1.
SPSin()	Return sine of FFP variable.
SPSincos()	Return sine and cosine of FFP variable.
SPSinh()	Return hyperbolic sine of FFP variable.
SPSqrt()	Return square root of FFP variable.
SPTan()	Return tangent of FFP variable.
SPTanh()	Return hyperbolic tangent of FFP variable.
SPTieee()	Convert FFP variable to IEEE format

Math Support Functions

Function	Description
afp()	Convert ASCII string into FFP equivalent.
fpa()	Convert FFP variable into ASCII equivalent.
arnd()	Round ASCII representation of FFP number.
dbf()	Convert FFP dual-binary number to FFP equivalent.

SP IEEE Basic Functions

Function	Description
IEEESPAbs()	Take absolute value of IEEE single-precision variable
IEEESPAdd()	Add two IEEE single-precision variables
IEEESPCeil()	Compute least integer greater than or equal to variable
IEEESPCmp()	Compare two IEEE single-precision variables
IEEESPDiv()	Divide two IEEE single-precision variables
IEEESPFix()	Convert IEEE single-precision variable to integer
IEEESPFloor()	Compute largest integer less than or equal to variable
IEEESPFlt()	Convert integer variable to IEEE single-precision
IEEESPMul()	Multiply two IEEE single-precision variables
IEEESPNeg()	Take two’s complement of IEEE single-precision variable
IEEESPSub()	Subtract two IEEE single-precision variables
IEEESPTst()	Test an IEEE single-precision variable against zero

SP IEEE Transcendental Functions

Function	Description
IEEESPACos()	Return arccosine of IEEE single-precision variable.
IEEESPASin()	Return arcsine of IEEE single-precision variable.
IEEESPAtan()	Return arctangent of IEEE single-precision variable.
IEEESPCos()	Return cosine of IEEE single-precision variable.
IEEESPCosh()	Return hyperbolic cosine of IEEE single-precision variable.
IEEESPExp()	Return e to the IEEE variable power.
IEEESPLog()	Return natural log (base e of IEEE single-precision variable.
IEEESPLog10()	Return log (base 10) of IEEE single-precision variable.
IEEESPPow()	Return power of IEEE single-precision variable.
IEEESPSin()	Return sine of IEEE single-precision variable.
IEEESPSincos()	Return sine and cosine of IEEE single-precision variable.
IEEESPSinh()	Return hyperbolic sine of IEEE single-precision variable.
IEEESPSqrt()	Return square root of IEEE single-precision variable.
IEEESPTan()	Return tangent of IEEE single-precision variable.
IEEESPTanh()	Return hyperbolic tangent of IEEE single-precision variable.

DP IEEE Basic Functions

Function	Description
IEEEDPAbs()	Take absolute value of IEEE double-precision variable
IEEEDPAdd()	Add two IEEE double-precision variables
IEEEDPCeil()	Compute least integer greater than or equal to variable
IEEEDPCmp()	Compare two IEEE double-precision variables
IEEEDPDiv()	Divide two IEEE double-precision variables
IEEEDPFix()	Convert IEEE double-precision variable to integer
IEEEDPFloor()	Compute largest integer less than or equal to variable
IEEEDPFlt()	Convert integer variable to IEEE double-precision
IEEEDPMul()	Multiply two IEEE double-precision variables
IEEEDPNeg()	Take two’s complement of IEEE double-precision variable
IEEEDPSub()	Subtract two IEEE single-precision variables
IEEEDPTst()	Test an IEEE double-precision variable against zero

DP IEEE Transcendental Functions

Function	Description
IEEEDPACos()	Return arccosine of IEEE double-precision variable.
IEEEDPASin()	Return arcsine of IEEE double-precision variable.
IEEEDPAtan()	Return arctangent of IEEE double-precision variable.
IEEEDPCos()	Return cosine of IEEE double-precision variable.
IEEEDPCosh()	Return hyperbolic cosine of IEEE double-precision variable.
IEEEDPExp()	Return e to the IEEE variable power.
IEEEDPFieee()	Convert IEEE single-precision number to IEEE double-precision number.
IEEEDPLog()	Return natural log (base e of IEEE double-precision variable.
IEEEDPLog10()	Return log (base 10) of IEEE double-precision variable.
IEEEDPPow()	Return power of IEEE double-precision variable.
IEEEDPSin()	Return sine of IEEE double-precision variable.
IEEEDPSincos()	Return sine and cosine of IEEE double-precision variable.
IEEEDPSinh()	Return hyperbolic sine of IEEE double-precision variable.
IEEEDPSqrt()	Return square root of IEEE double-precision variable.
IEEEDPTan()	Return tangent of IEEE double-precision variable.
IEEEDPTanh()	Return hyperbolic tangent of IEEE double-precision variable.
IEEEDPTieee()	Convert IEEE double-precision number to IEEE single-precision number.