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https://github.com/irmen/prog8.git
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588 lines
12 KiB
NASM
588 lines
12 KiB
NASM
; ---- builtin functions
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func_any_b_into_A .proc
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; -- any(array), array in P8ZP_SCRATCH_W1, num bytes in A
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sta _cmp_mod+1 ; self-modifying code
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ldy #0
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- lda (P8ZP_SCRATCH_W1),y
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bne _got_any
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iny
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_cmp_mod cpy #255 ; modified
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bne -
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lda #0
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rts
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_got_any lda #1
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rts
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.pend
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func_all_b_into_A .proc
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; -- all(array), array in P8ZP_SCRATCH_W1, num bytes in A
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sta _cmp_mod+1 ; self-modifying code
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ldy #0
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- lda (P8ZP_SCRATCH_W1),y
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beq _got_not_all
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iny
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_cmp_mod cpy #255 ; modified
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bne -
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lda #1
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_got_not_all rts
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.pend
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func_any_w_into_A .proc
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asl a
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jmp func_any_b_into_A
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.pend
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func_all_w_into_A .proc
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; -- all(warray), array in P8ZP_SCRATCH_W1, num bytes in A
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asl a ; times 2 because of word
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sta _cmp_mod+1 ; self-modifying code
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ldy #0
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- lda (P8ZP_SCRATCH_W1),y
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bne +
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iny
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lda (P8ZP_SCRATCH_W1),y
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bne ++
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lda #0
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rts
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+ iny
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+ iny
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_cmp_mod cpy #255 ; modified
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bne -
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lda #1
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rts
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.pend
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abs_b_into_A .proc
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; -- A = abs(A)
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cmp #0
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bmi +
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rts
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+ eor #$ff
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clc
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adc #1
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rts
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.pend
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abs_w_into_AY .proc
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; -- AY = abs(AY)
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cpy #0
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bmi +
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rts
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+ eor #$ff
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pha
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tya
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eor #$ff
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tay
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pla
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clc
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adc #1
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bcc +
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iny
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+ rts
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.pend
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func_sign_b_into_A .proc
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cmp #0
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beq _zero
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bmi _neg
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lda #1
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_zero rts
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_neg lda #-1
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rts
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.pend
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func_sign_ub_into_A .proc
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cmp #0
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bne _pos
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rts
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_pos lda #1
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rts
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.pend
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func_sign_uw_into_A .proc
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cpy #0
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beq _possibly_zero
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_pos lda #1
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rts
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_possibly_zero cmp #0
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bne _pos
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rts
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.pend
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func_sign_w_into_A .proc
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cpy #0
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beq _possibly_zero
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bmi _neg
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_pos lda #1
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rts
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_neg lda #-1
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rts
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_possibly_zero cmp #0
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bne _pos
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rts
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.pend
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func_sqrt16_into_A .proc
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; integer square root
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; http://6502org.wikidot.com/software-math-sqrt
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; https://github.com/TobyLobster/sqrt_test/blob/main/sqrt/sqrt7.a
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; Tweaked by TobyLobster and 0xC0DE to be smaller and faster
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_numl = P8ZP_SCRATCH_W1
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_numh = P8ZP_SCRATCH_W1+1
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_loop_counter = P8ZP_SCRATCH_REG
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_root = P8ZP_SCRATCH_B1
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sta _numl
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sty _numh
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ldx #$ff
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stx _loop_counter
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inx
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stx _root
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sec
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_loop lda _numh
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sbc #$40
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tay
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txa
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sbc _root
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bcc +
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sty _numh
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bcs ++
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+ txa
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+ rol _root
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asl _numl
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rol _numh
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rol a
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asl _numl
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rol _numh
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rol a
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tax
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lsr _loop_counter
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bne _loop
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lda _root
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rts
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.pend
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func_sort_ub .proc
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; 8bit unsigned sort
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; sorting subroutine coded by mats rosengren (mats.rosengren@esa.int)
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; input: address of array to sort in P8ZP_SCRATCH_W1, length in S
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; first, put pointer BEFORE array
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sta P8ZP_SCRATCH_B1
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lda P8ZP_SCRATCH_W1
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bne +
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dec P8ZP_SCRATCH_W1+1
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+ dec P8ZP_SCRATCH_W1
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_sortloop ldy P8ZP_SCRATCH_B1 ;start of subroutine sort
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lda (P8ZP_SCRATCH_W1),y ;last value in (what is left of) sequence to be sorted
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sta P8ZP_SCRATCH_REG ;save value. will be over-written by largest number
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jmp _l2
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_l1 dey
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beq _l3
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lda (P8ZP_SCRATCH_W1),y
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cmp P8ZP_SCRATCH_W2+1
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bcc _l1
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_l2 sty P8ZP_SCRATCH_W2 ;index of potentially largest value
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sta P8ZP_SCRATCH_W2+1 ;potentially largest value
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jmp _l1
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_l3 ldy P8ZP_SCRATCH_B1 ;where the largest value shall be put
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lda P8ZP_SCRATCH_W2+1 ;the largest value
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sta (P8ZP_SCRATCH_W1),y ;put largest value in place
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ldy P8ZP_SCRATCH_W2 ;index of free space
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lda P8ZP_SCRATCH_REG ;the over-written value
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sta (P8ZP_SCRATCH_W1),y ;put the over-written value in the free space
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dec P8ZP_SCRATCH_B1 ;end of the shorter sequence still left
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bne _sortloop ;start working with the shorter sequence
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rts
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.pend
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func_sort_b .proc
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; 8bit signed sort
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; sorting subroutine coded by mats rosengren (mats.rosengren@esa.int)
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; input: address of array to sort in P8ZP_SCRATCH_W1, length in A
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; first, put pointer BEFORE array
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sta P8ZP_SCRATCH_B1
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lda P8ZP_SCRATCH_W1
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bne +
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dec P8ZP_SCRATCH_W1+1
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+ dec P8ZP_SCRATCH_W1
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_sortloop ldy P8ZP_SCRATCH_B1 ;start of subroutine sort
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lda (P8ZP_SCRATCH_W1),y ;last value in (what is left of) sequence to be sorted
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sta P8ZP_SCRATCH_REG ;save value. will be over-written by largest number
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jmp _l2
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_l1 dey
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beq _l3
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lda (P8ZP_SCRATCH_W1),y
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cmp P8ZP_SCRATCH_W2+1
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bmi _l1
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_l2 sty P8ZP_SCRATCH_W2 ;index of potentially largest value
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sta P8ZP_SCRATCH_W2+1 ;potentially largest value
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jmp _l1
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_l3 ldy P8ZP_SCRATCH_B1 ;where the largest value shall be put
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lda P8ZP_SCRATCH_W2+1 ;the largest value
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sta (P8ZP_SCRATCH_W1),y ;put largest value in place
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ldy P8ZP_SCRATCH_W2 ;index of free space
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lda P8ZP_SCRATCH_REG ;the over-written value
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sta (P8ZP_SCRATCH_W1),y ;put the over-written value in the free space
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dec P8ZP_SCRATCH_B1 ;end of the shorter sequence still left
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bne _sortloop ;start working with the shorter sequence
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rts
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.pend
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func_sort_uw .proc
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; 16bit unsigned sort
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; sorting subroutine coded by mats rosengren (mats.rosengren@esa.int)
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; input: address of array to sort in P8ZP_SCRATCH_W1, length in A
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; first: subtract 2 of the pointer
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asl a
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sta P8ZP_SCRATCH_B1
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lda P8ZP_SCRATCH_W1
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sec
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sbc #2
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sta P8ZP_SCRATCH_W1
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bcs _sort_loop
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dec P8ZP_SCRATCH_W1+1
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_sort_loop ldy P8ZP_SCRATCH_B1 ;start of subroutine sort
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lda (P8ZP_SCRATCH_W1),y ;last value in (what is left of) sequence to be sorted
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sta _work3 ;save value. will be over-written by largest number
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta _work3+1
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dey
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jmp _l2
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_l1 dey
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dey
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beq _l3
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iny
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lda (P8ZP_SCRATCH_W1),y
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dey
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cmp P8ZP_SCRATCH_W2+1
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bne +
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lda (P8ZP_SCRATCH_W1),y
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cmp P8ZP_SCRATCH_W2
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+ bcc _l1
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_l2 sty _work1 ;index of potentially largest value
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lda (P8ZP_SCRATCH_W1),y
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sta P8ZP_SCRATCH_W2 ;potentially largest value
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta P8ZP_SCRATCH_W2+1
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dey
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jmp _l1
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_l3 ldy P8ZP_SCRATCH_B1 ;where the largest value shall be put
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lda P8ZP_SCRATCH_W2 ;the largest value
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sta (P8ZP_SCRATCH_W1),y ;put largest value in place
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iny
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lda P8ZP_SCRATCH_W2+1
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sta (P8ZP_SCRATCH_W1),y
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ldy _work1 ;index of free space
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lda _work3 ;the over-written value
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sta (P8ZP_SCRATCH_W1),y ;put the over-written value in the free space
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iny
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lda _work3+1
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sta (P8ZP_SCRATCH_W1),y
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dey
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dec P8ZP_SCRATCH_B1 ;end of the shorter sequence still left
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dec P8ZP_SCRATCH_B1
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bne _sort_loop ;start working with the shorter sequence
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rts
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_work1 .byte 0
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_work3 .word 0
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.pend
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func_sort_w .proc
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; 16bit signed sort
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; sorting subroutine coded by mats rosengren (mats.rosengren@esa.int)
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; input: address of array to sort in P8ZP_SCRATCH_W1, length in A
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; first: subtract 2 of the pointer
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asl a
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sta P8ZP_SCRATCH_B1
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lda P8ZP_SCRATCH_W1
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sec
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sbc #2
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sta P8ZP_SCRATCH_W1
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bcs _sort_loop
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dec P8ZP_SCRATCH_W1+1
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_sort_loop ldy P8ZP_SCRATCH_B1 ;start of subroutine sort
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lda (P8ZP_SCRATCH_W1),y ;last value in (what is left of) sequence to be sorted
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sta _work3 ;save value. will be over-written by largest number
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta _work3+1
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dey
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jmp _l2
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_l1 dey
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dey
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beq _l3
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lda (P8ZP_SCRATCH_W1),y
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cmp P8ZP_SCRATCH_W2
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iny
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lda (P8ZP_SCRATCH_W1),y
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dey
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sbc P8ZP_SCRATCH_W2+1
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bvc +
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eor #$80
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+ bmi _l1
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_l2 sty _work1 ;index of potentially largest value
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lda (P8ZP_SCRATCH_W1),y
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sta P8ZP_SCRATCH_W2 ;potentially largest value
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta P8ZP_SCRATCH_W2+1
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dey
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jmp _l1
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_l3 ldy P8ZP_SCRATCH_B1 ;where the largest value shall be put
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lda P8ZP_SCRATCH_W2 ;the largest value
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sta (P8ZP_SCRATCH_W1),y ;put largest value in place
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iny
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lda P8ZP_SCRATCH_W2+1
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sta (P8ZP_SCRATCH_W1),y
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ldy _work1 ;index of free space
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lda _work3 ;the over-written value
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sta (P8ZP_SCRATCH_W1),y ;put the over-written value in the free space
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iny
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lda _work3+1
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sta (P8ZP_SCRATCH_W1),y
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dey
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dec P8ZP_SCRATCH_B1 ;end of the shorter sequence still left
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dec P8ZP_SCRATCH_B1
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bne _sort_loop ;start working with the shorter sequence
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rts
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_work1 .byte 0
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_work3 .word 0
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.pend
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func_reverse_b .proc
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; --- reverse an array of bytes (in-place)
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; inputs: pointer to array in P8ZP_SCRATCH_W1, length in A
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_index_right = P8ZP_SCRATCH_W2
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_index_left = P8ZP_SCRATCH_W2+1
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_loop_count = P8ZP_SCRATCH_REG
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sta _loop_count
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lsr _loop_count
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sec
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sbc #1
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sta _index_right
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lda #0
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sta _index_left
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_loop ldy _index_right
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lda (P8ZP_SCRATCH_W1),y
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pha
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ldy _index_left
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lda (P8ZP_SCRATCH_W1),y
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ldy _index_right
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sta (P8ZP_SCRATCH_W1),y
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pla
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ldy _index_left
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sta (P8ZP_SCRATCH_W1),y
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inc _index_left
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dec _index_right
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dec _loop_count
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bne _loop
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rts
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.pend
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func_reverse_w .proc
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; --- reverse an array of words (in-place)
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; inputs: pointer to array in P8ZP_SCRATCH_W1, length in A
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_index_first = P8ZP_SCRATCH_W2
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_index_second = P8ZP_SCRATCH_W2+1
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_loop_count = P8ZP_SCRATCH_REG
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pha
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asl a ; *2 because words
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sec
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sbc #2
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sta _index_first
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lda #0
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sta _index_second
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pla
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lsr a
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pha
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sta _loop_count
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; first reverse the lsbs
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_loop_lo ldy _index_first
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lda (P8ZP_SCRATCH_W1),y
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pha
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ldy _index_second
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lda (P8ZP_SCRATCH_W1),y
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ldy _index_first
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sta (P8ZP_SCRATCH_W1),y
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pla
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ldy _index_second
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sta (P8ZP_SCRATCH_W1),y
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inc _index_second
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inc _index_second
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dec _index_first
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dec _index_first
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dec _loop_count
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bne _loop_lo
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; now reverse the msbs
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dec _index_second
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inc _index_first
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inc _index_first
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inc _index_first
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pla
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sta _loop_count
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_loop_hi ldy _index_first
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lda (P8ZP_SCRATCH_W1),y
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pha
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ldy _index_second
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lda (P8ZP_SCRATCH_W1),y
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ldy _index_first
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sta (P8ZP_SCRATCH_W1),y
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pla
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ldy _index_second
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sta (P8ZP_SCRATCH_W1),y
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dec _index_second
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dec _index_second
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inc _index_first
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inc _index_first
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dec _loop_count
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bne _loop_hi
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rts
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.pend
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func_peekw .proc
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; -- read the word value on the address in AY
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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ldy #0
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lda (P8ZP_SCRATCH_W1),y
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pha
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iny
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lda (P8ZP_SCRATCH_W1),y
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tay
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pla
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rts
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.pend
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func_pokew .proc
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; -- store the word value in AY in the address in P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_REG
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ldy #0
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sta (P8ZP_SCRATCH_W1),y
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iny
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lda P8ZP_SCRATCH_REG
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sta (P8ZP_SCRATCH_W1),y
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rts
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.pend
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func_clamp_byte .proc
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; signed value in A, result in A
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; minimum in P8ZP_SCRATCH_W1
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; maximum in P8ZP_SCRATCH_W1+1
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tay
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sec
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sbc P8ZP_SCRATCH_W1+1
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bvc +
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eor #$80
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+ bmi +
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lda P8ZP_SCRATCH_W1+1
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tay
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jmp ++
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+ tya
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+ sec
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sbc P8ZP_SCRATCH_W1
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bvc +
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eor #$80
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+ bmi +
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tya
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rts
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+ lda P8ZP_SCRATCH_W1
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rts
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.pend
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func_clamp_ubyte .proc
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; value in A, result in A
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; minimum in P8ZP_SCRATCH_W1
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; maximum in P8ZP_SCRATCH_W1+1
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cmp P8ZP_SCRATCH_W1+1
|
|
bcc +
|
|
lda P8ZP_SCRATCH_W1+1
|
|
+ cmp P8ZP_SCRATCH_W1
|
|
bcc +
|
|
rts
|
|
+ lda P8ZP_SCRATCH_W1
|
|
rts
|
|
.pend
|
|
|
|
func_clamp_word .proc
|
|
; signed value in AY, result in AY
|
|
; minimum in P8ZP_SCRATCH_W1
|
|
; maximum in P8ZP_SCRATCH_W2
|
|
sta P8ZP_SCRATCH_B1
|
|
sty P8ZP_SCRATCH_REG
|
|
ldy P8ZP_SCRATCH_W2+1
|
|
lda P8ZP_SCRATCH_W2
|
|
cmp P8ZP_SCRATCH_B1
|
|
tya
|
|
sbc P8ZP_SCRATCH_REG
|
|
bvc +
|
|
eor #$80
|
|
+ bpl +
|
|
lda P8ZP_SCRATCH_W2
|
|
ldy P8ZP_SCRATCH_W2+1
|
|
sta P8ZP_SCRATCH_B1
|
|
sty P8ZP_SCRATCH_REG
|
|
+ ldy P8ZP_SCRATCH_W1+1
|
|
lda P8ZP_SCRATCH_W1
|
|
cmp P8ZP_SCRATCH_B1
|
|
tya
|
|
sbc P8ZP_SCRATCH_REG
|
|
bvc +
|
|
eor #$80
|
|
+ bpl +
|
|
ldy P8ZP_SCRATCH_REG
|
|
lda P8ZP_SCRATCH_B1
|
|
rts
|
|
+ ldy P8ZP_SCRATCH_W1+1
|
|
lda P8ZP_SCRATCH_W1
|
|
rts
|
|
.pend
|
|
|
|
func_clamp_uword .proc
|
|
; value in AY, result in AY
|
|
; minimum in P8ZP_SCRATCH_W1
|
|
; maximum in P8ZP_SCRATCH_W2
|
|
sta P8ZP_SCRATCH_B1
|
|
sty P8ZP_SCRATCH_REG
|
|
cpy P8ZP_SCRATCH_W2+1
|
|
bcc ++
|
|
bne +
|
|
cmp P8ZP_SCRATCH_W2
|
|
bcc ++
|
|
+ beq +
|
|
lda P8ZP_SCRATCH_W2
|
|
ldy P8ZP_SCRATCH_W2+1
|
|
sta P8ZP_SCRATCH_B1
|
|
sty P8ZP_SCRATCH_REG
|
|
+ ldy P8ZP_SCRATCH_REG
|
|
lda P8ZP_SCRATCH_B1
|
|
cpy P8ZP_SCRATCH_W1+1
|
|
bcc ++
|
|
bne +
|
|
cmp P8ZP_SCRATCH_W1
|
|
bcc ++
|
|
+ beq +
|
|
ldy P8ZP_SCRATCH_REG
|
|
lda P8ZP_SCRATCH_B1
|
|
rts
|
|
+ ldy P8ZP_SCRATCH_W1+1
|
|
lda P8ZP_SCRATCH_W1
|
|
rts
|
|
|
|
.pend
|