mirror of
https://github.com/byteworksinc/ORCA-C.git
synced 2024-05-28 12:41:35 +00:00
00e7fe7125
The new value of maxLocalLabel is aligned with the C99+ requirement to support "511 identifiers with block scope declared in one block". The value of maxLabel is now the maximum it can be while keeping the size of the labelTab array under 32 KiB. (I'm not entirely sure the address calculations in the code generated by ORCA/Pascal would work correctly beyond that.)
276 lines
6.7 KiB
NASM
276 lines
6.7 KiB
NASM
mcopy cgc.macros
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****************************************************************
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*
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* CnvSX - Convert floating point to SANE extended
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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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****************************************************************
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*
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CnvSX 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_ext equ 10 disp to extended (SANE) value
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tsc set up DP
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phd
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tcd
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ph4 rec push addr of real number
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clc push addr of SANE number
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lda rec
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adc #rec_ext
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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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fx2x convert TOS to extended
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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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* 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_ext equ 10 disp to extended (SANE) value
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rec_cmp equ 20 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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