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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.
mathieeedoubbas.c
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 |
| |
| Function Input Output Condition Codes |
|_________________________________________________________________________|
| | | | |
| _LVOIEEEDPFix | D0/D1=IEEE arg | D0=Integer | N=undefined |
| | double-precision | (two's complement) | Z=undefined |
| | | | V=undefined |
| | | | C=undefined |
| | | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPFl | D0=Integer arg | D0/D1=IEEE | N=undefined |
| | (two's | double-precision | Z=undefined |
| | complement) | | V=undefined |
| | | | C=undefined |
| | | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPCmp | D0/D1=IEEE arg1 | D0=+1 if arg1>arg2 | N=1 if result |
| | double-precision | D0=-1 if arg1<arg2 | is negative |
| | D2/D3=IEEE arg2 | D0=0 if arg1=arg2 | Z=1 if result |
| | double-precision | | 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 |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPTst | D0/D1=IEEE arg | D0=+1 if arg>0.0 | N=1 if result |
| | double-precision | D0=-1 if arg<0.0 | is negative |
| | | D0=0 if arg=0.0 | 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 |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPAbs | D0/D1=IEEE arg | D0/D1=IEEE | N=undefined |
| | double-precision | double-precision | Z=undefined |
| | | absolute value | V=undefined |
| | | | C=undefined |
| | | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPNeg | D0/D1=IEEE arg | D0/D1=IEEE | N=undefined |
| | double-precision | double-precision | Z=undefined |
| | | negated | V=undefined |
| | | | C=undefined |
| | | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPAdd | D0/D1=IEEE arg1 | D0/D1=IEEE | N=undefined |
| | double-precision | double-precision | Z=undefined |
| | | addition of | V=undefined |
| | D2/D3=IEEE arg2 | arg1+arg2 | C=undefined |
| | double-precision | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPSub | D0/D1=IEEE arg1 | D0/D1=IEEE | N=undefined |
| | double-precision | double-precision | Z=undefined |
| | | subtraction of | V=undefined |
| | D2/D3=IEEE arg2 | arg1-arg2 | C=undefined |
| | double-precision | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPMul | D0/D1=IEEE arg1 | D0/D1=IEEE | N=undefined |
| | double-precision | double-precision | Z=undefined |
| | | multiplication of | V=undefined |
| | D2/D3=IEEE arg2 | arg1*arg2 | C=undefined |
| | double-precision | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPDiv | D0/D1=IEEE arg1 | D0/D1=IEEE | N=undefined |
| | double-precision | double-precision | Z=undefined |
| | | division of | V=undefined |
| | D2/D3=IEEE arg2 | arg1/arg2 | C=undefined |
| | double-precision | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPCeil | D0/D1=IEEE arg | D0/D1=least | N=undefined |
| | double-precision | integer | Z=undefined |
| | | >= arg | V=undefined |
| | | | C=undefined |
| | | | X=undefined |
|-----------------|------------------|--------------------|---------------|
| _LVOIEEEDPFloor | D0/D1=IEEE arg | D0/D1=largest | N=undefined |
| | double-precision | integer | Z=undefined |
| | | <= arg | V=undefined |
| | | | C=undefined |
| | | | X=undefined |
|_________________|__________________|____________________|_______________|