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https://github.com/irmen/prog8.git
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464 lines
8.9 KiB
NASM
464 lines
8.9 KiB
NASM
; --- low level floating point assembly routines for the C64
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FL_ONE_const .byte 129 ; 1.0
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FL_ZERO_const .byte 0,0,0,0,0 ; 0.0
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FL_LOG2_const .byte $80, $31, $72, $17, $f8 ; log(2)
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floats_temp_var .byte 0,0,0,0,0 ; temporary storage for a float
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ub2float .proc
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; -- convert ubyte in SCRATCH_ZPB1 to float at address A/Y
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; clobbers A, X, Y
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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ldy P8ZP_SCRATCH_B1
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lda #0
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jsr GIVAYF
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_fac_to_mem ldx P8ZP_SCRATCH_W2
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ldy P8ZP_SCRATCH_W2+1
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jmp MOVMF
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.pend
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b2float .proc
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; -- convert byte in SCRATCH_ZPB1 to float at address A/Y
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; clobbers A, X, Y
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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lda P8ZP_SCRATCH_B1
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jsr FREADSA
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jmp ub2float._fac_to_mem
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.pend
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uw2float .proc
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; -- convert uword in SCRATCH_ZPWORD1 to float at address A/Y
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; clobbers X
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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lda P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jsr GIVUAYFAY
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jmp ub2float._fac_to_mem
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.pend
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w2float .proc
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; -- convert word in SCRATCH_ZPWORD1 to float at address A/Y
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; clobbers X
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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ldy P8ZP_SCRATCH_W1
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lda P8ZP_SCRATCH_W1+1
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jsr GIVAYF
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jmp ub2float._fac_to_mem
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.pend
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cast_from_uw .proc
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; -- uword in A/Y into float var at (P8ZP_SCRATCH_W2)
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; clobbers X
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jsr GIVUAYFAY
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jmp ub2float._fac_to_mem
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.pend
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cast_from_w .proc
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; -- word in A/Y into float var at (P8ZP_SCRATCH_W2)
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; clobbers X
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jsr GIVAYFAY
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jmp ub2float._fac_to_mem
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.pend
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cast_from_ub .proc
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; -- ubyte in Y into float var at (P8ZP_SCRATCH_W2)
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; clobbers X
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jsr FREADUY
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jmp ub2float._fac_to_mem
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.pend
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cast_from_b .proc
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; -- byte in A into float var at (P8ZP_SCRATCH_W2)
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; clobbers X
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jsr FREADSA
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jmp ub2float._fac_to_mem
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.pend
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cast_as_uw_into_ya .proc ; also used for float 2 ub
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; -- cast float at A/Y to uword into Y/A
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; clobbers X
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jsr MOVFM
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jmp cast_FAC1_as_uw_into_ya
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.pend
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cast_as_w_into_ay .proc ; also used for float 2 b
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; -- cast float at A/Y to word into A/Y
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; clobbers X
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jsr MOVFM
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jmp cast_FAC1_as_w_into_ay
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.pend
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cast_as_bool_into_a .proc
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; -- cast float at A/Y to bool into A
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; clobbers X
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jsr MOVFM
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jmp cast_FAC1_as_bool_into_a
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.pend
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cast_FAC1_as_bool_into_a .proc
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; -- cast fac1 to bool into A
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; clobbers X
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jsr SIGN
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and #1
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rts
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.pend
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cast_FAC1_as_uw_into_ya .proc ; also used for float 2 ub
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; -- cast fac1 to uword into Y/A
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; clobbers X
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jmp GETADR ; into Y/A
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.pend
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cast_FAC1_as_w_into_ay .proc ; also used for float 2 b
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; -- cast fac1 to word into A/Y. clobbers X
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jmp AYINT2
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.pend
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copy_float .proc
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; -- copies the 5 bytes of the mflt value pointed to by P8ZP_SCRATCH_W1,
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; into the 5 bytes pointed to by A/Y. Clobbers A,Y.
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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ldy #0
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lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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rts
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.pend
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inc_var_f .proc
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; -- add 1 to float pointed to by A/Y
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; clobbers X
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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jsr MOVFM
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lda #<FL_ONE_const
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ldy #>FL_ONE_const
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jsr FADD
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ldx P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jmp MOVMF
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.pend
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dec_var_f .proc
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; -- subtract 1 from float pointed to by A/Y
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; clobbers X
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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lda #<FL_ONE_const
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ldy #>FL_ONE_const
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jsr MOVFM
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lda P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jsr FSUB
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ldx P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jmp MOVMF
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.pend
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fmath_float1 .byte 0,0,0,0,0 ; storage for a mflpt5 value
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fmath_float2 .byte 0,0,0,0,0 ; storage for a mflpt5 value
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var_fac1_less_f .proc
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; -- is the float in FAC1 < the variable AY? Result in A. Clobbers X.
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jsr FCOMP
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cmp #255
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_lesseq_f .proc
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; -- is the float in FAC1 <= the variable AY? Result in A. Clobbers X.
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jsr FCOMP
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cmp #0
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beq +
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cmp #255
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_greater_f .proc
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; -- is the float in FAC1 > the variable AY? Result in A. Clobbers X.
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jsr FCOMP
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cmp #1
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_greatereq_f .proc
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; -- is the float in FAC1 >= the variable AY? Result in A. Clobbers X.
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jsr FCOMP
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cmp #0
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beq +
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cmp #1
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_equal_f .proc
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; -- are the floats numbers in FAC1 and the variable AY identical? Result in A. Clobbers X.
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jsr FCOMP
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and #1
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eor #1
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rts
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.pend
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var_fac1_notequal_f .proc
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; -- are the floats numbers in FAC1 and the variable AY *not* identical? Result in A. Clobbers X.
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jsr FCOMP
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and #1
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rts
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.pend
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vars_equal_f .proc
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; -- are the mflpt5 numbers in P8ZP_SCRATCH_W1 and AY identical? Result in A
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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ldy #0
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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lda #1
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rts
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_false lda #0
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rts
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.pend
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vars_less_f .proc
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; -- is float in AY < float in P8ZP_SCRATCH_W2 ? Result in A. Clobbers X.
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jsr MOVFM
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lda P8ZP_SCRATCH_W2
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ldy P8ZP_SCRATCH_W2+1
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jsr FCOMP
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cmp #255
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bne +
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lda #1
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rts
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+ lda #0
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rts
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.pend
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vars_lesseq_f .proc
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; -- is float in AY <= float in P8ZP_SCRATCH_W2 ? Result in A. Clobbers X.
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jsr MOVFM
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lda P8ZP_SCRATCH_W2
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ldy P8ZP_SCRATCH_W2+1
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jsr FCOMP
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cmp #255
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bne +
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- lda #1
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rts
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+ cmp #0
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beq -
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lda #0
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rts
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.pend
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less_f .proc
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; -- is f1 < f2? Result in A. Clobbers X.
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jsr compare_floats
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cmp #255
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beq compare_floats._return_true
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bne compare_floats._return_false
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.pend
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lesseq_f .proc
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; -- is f1 <= f2? Result in A. Clobbers X.
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jsr compare_floats
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cmp #255
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beq compare_floats._return_true
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cmp #0
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beq compare_floats._return_true
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bne compare_floats._return_false
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.pend
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greater_f .proc
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; -- is f1 > f2? Result in A. Clobbers X.
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jsr compare_floats
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cmp #1
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beq compare_floats._return_true
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bne compare_floats._return_false
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.pend
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greatereq_f .proc
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; -- is f1 >= f2? Result in A. Clobbers X.
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jsr compare_floats
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cmp #1
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beq compare_floats._return_true
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cmp #0
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beq compare_floats._return_true
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bne compare_floats._return_false
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.pend
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set_array_float_from_fac1 .proc
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; -- set the float in FAC1 in the array (index in A, array in P8ZP_SCRATCH_W1)
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; clobbers X
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sta P8ZP_SCRATCH_B1
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asl a
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asl a
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clc
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adc P8ZP_SCRATCH_B1
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ldy P8ZP_SCRATCH_W1+1
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clc
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adc P8ZP_SCRATCH_W1
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bcc +
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iny
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+ tax
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jmp MOVMF
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.pend
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set_0_array_float .proc
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; -- set a float in an array to zero (index in A, array in P8ZP_SCRATCH_W1)
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sta P8ZP_SCRATCH_B1
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asl a
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asl a
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clc
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adc P8ZP_SCRATCH_B1
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tay
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lda #0
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sta (P8ZP_SCRATCH_W1),y
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iny
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sta (P8ZP_SCRATCH_W1),y
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iny
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sta (P8ZP_SCRATCH_W1),y
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iny
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sta (P8ZP_SCRATCH_W1),y
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iny
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sta (P8ZP_SCRATCH_W1),y
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rts
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.pend
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set_array_float .proc
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; -- set a float in an array to a value (index in A, float in P8ZP_SCRATCH_W1, array in P8ZP_SCRATCH_W2)
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sta P8ZP_SCRATCH_B1
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asl a
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asl a
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clc
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adc P8ZP_SCRATCH_B1
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adc P8ZP_SCRATCH_W2
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ldy P8ZP_SCRATCH_W2+1
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bcc +
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iny
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+ jmp copy_float
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; -- copies the 5 bytes of the mflt value pointed to by SCRATCH_ZPWORD1,
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; into the 5 bytes pointed to by A/Y. Clobbers A,Y.
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.pend
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pushFAC1 .proc
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;-- push floating point in FAC onto the cpu stack
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; save return address
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pla
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sta P8ZP_SCRATCH_W2
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pla
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sta P8ZP_SCRATCH_W2+1
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ldx #<floats.floats_temp_var
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ldy #>floats.floats_temp_var
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jsr floats.MOVMF
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lda floats.floats_temp_var
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pha
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lda floats.floats_temp_var+1
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pha
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lda floats.floats_temp_var+2
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pha
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lda floats.floats_temp_var+3
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pha
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lda floats.floats_temp_var+4
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pha
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; re-push return address
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lda P8ZP_SCRATCH_W2+1
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pha
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lda P8ZP_SCRATCH_W2
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pha
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rts
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.pend
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popFAC .proc
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; -- pop floating point value from cpu stack into FAC1 or FAC2 (
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; carry flag clear=FAC1, carry set=FAC2
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; save return address
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pla
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sta P8ZP_SCRATCH_W2
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pla
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sta P8ZP_SCRATCH_W2+1
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pla
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sta floats.floats_temp_var+4
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pla
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sta floats.floats_temp_var+3
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pla
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sta floats.floats_temp_var+2
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pla
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sta floats.floats_temp_var+1
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pla
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sta floats.floats_temp_var
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lda #<floats.floats_temp_var
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ldy #>floats.floats_temp_var
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bcs +
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jsr floats.MOVFM
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jmp ++
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+ jsr floats.CONUPK
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+ ; re-push return address
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lda P8ZP_SCRATCH_W2+1
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pha
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lda P8ZP_SCRATCH_W2
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pha
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rts
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.pend
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