241 lines
5.7 KiB
NASM
241 lines
5.7 KiB
NASM
mcopy cgc.macros
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****************************************************************
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*
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* CnvSC - Convert floating point to SANE comp
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*
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* Inputs:
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* rec - pointer to a record
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*
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* Note: This avoids calling FX2C on negative numbers,
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* because it is buggy for certain values.
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*
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****************************************************************
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*
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CnvSC start cg
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rec equ 4 record containing values
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rec_real equ 0 disp to real (extended) value
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rec_cmp equ 10 disp to comp (SANE) value
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tsc set up DP
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phd
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tcd
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ldy #rec_real+8
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lda [rec],y
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pha save sign of real number
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and #$7fff
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sta [rec],y set sign of real number to positive
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ph4 rec push addr of real number
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clc push addr of SANE comp number
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lda rec
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adc #rec_cmp
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tax
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lda rec+2
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adc #0
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pha
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phx
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fx2c convert TOS to SANE comp number
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pla
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bpl ret if real number was negative
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ldy #rec_real+8 restore original sign of real number
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sta [rec],y
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sec negate the comp value
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ldy #rec_cmp
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ldx #0
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txa
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sbc [rec],y
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sta [rec],y
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iny
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iny
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txa
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sbc [rec],y
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sta [rec],y
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iny
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iny
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txa
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sbc [rec],y
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sta [rec],y
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iny
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iny
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txa
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sbc [rec],y
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sta [rec],y
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ret move4 0,4 return
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pld
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pla
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pla
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rtl
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end
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****************************************************************
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*
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* procedure CnvXLL (var result: longlong; val: extended);
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*
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* Convert floating point to long long
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*
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* Inputs:
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* result - longlong to hold the converted value
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* val - the real value
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*
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****************************************************************
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CnvXLL start cg
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subroutine (4:result,10:val),0
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pei (val+8)
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pei (val+6)
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pei (val+4)
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pei (val+2)
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pei (val)
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jsl ~CnvRealLongLong
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pl8 [result]
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return
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end
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****************************************************************
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*
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* procedure CnvXULL (var result: longlong; val: extended);
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*
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* Convert floating point to unsigned long long
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*
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* Inputs:
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* result - longlong to hold the converted value
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* val - the real value
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*
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****************************************************************
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CnvXULL start cg
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subroutine (4:result,10:val),0
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pei (val+8)
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pei (val+6)
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pei (val+4)
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pei (val+2)
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pei (val)
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jsl ~CnvRealULongLong
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pl8 [result]
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return
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end
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****************************************************************
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*
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* function CnvLLX (val: longlong): extended;
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*
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* convert a long long to a real number
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*
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* Inputs:
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* val - the long long value
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*
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****************************************************************
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CnvLLX start cg
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subroutine (4:val),0
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ph8 [val]
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jsl ~CnvLongLongReal
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pla
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sta >rval
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pla
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sta >rval+2
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pla
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sta >rval+4
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pla
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sta >rval+6
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pla
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sta >rval+8
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lla val,rval
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return 4:val
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rval ds 10
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end
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****************************************************************
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*
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* function CnvULLX (val: longlong): extended;
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*
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* convert an unsigned long long to a real number
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*
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* Inputs:
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* val - the unsigned long long value
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*
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****************************************************************
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CnvULLX start cg
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subroutine (4:val),0
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ph8 [val]
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jsl ~CnvULongLongReal
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pla
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sta >rval
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pla
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sta >rval+2
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pla
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sta >rval+4
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pla
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sta >rval+6
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pla
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sta >rval+8
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lla val,rval
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return 4:val
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rval ds 10
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end
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datachk off
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****************************************************************
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*
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* InitLabels - initialize the labels array
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*
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* Outputs:
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* labelTab - initialized
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* intLabel - initialized
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*
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****************************************************************
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*
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InitLabels start cg
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maxLabel equ 3275
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! with labelTab[0] do begin
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lda #-1 val := -1;
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sta labelTab+6
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sta labelTab+8
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stz labelTab defined := false;
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stz labelTab+2 chain := nil;
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stz labelTab+4
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! end; {with}
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ldx #labelTab for i := 1 to maxLabel do
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ldy #labelTab+10 labelTab[i] := labelTab[0];
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lda #maxLabel*10-1
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mvn labelTab,labelTab
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stz intLabel intLabel := 0;
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rtl
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end
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datachk on
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****************************************************************
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*
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* function SignBit (val: extended): integer;
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*
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* returns the sign bit of a floating-point number
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* (0 for positive, 1 for negative)
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*
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****************************************************************
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*
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SignBit start cg
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subroutine (10:val),0
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asl val+8
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stz val
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rol val
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return 2:val
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end
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