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prog8/prog8lib/prog8lib.p8

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; Prog8 internal library routines - always included by the compiler
;
; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
;
; indent format: TABS, size=8
~ prog8_lib {
; @TODO move all this assembly to a real .asm file instead and include that...
; note: the following ZP scratch registers must be the same as in c64lib
memory ubyte SCRATCH_ZPB1 = $02 ; scratch byte 1 in ZP
memory ubyte SCRATCH_ZPREG = $03 ; scratch register in ZP
memory ubyte SCRATCH_ZPREGX = $fa ; temp storage for X register (stack pointer)
memory uword SCRATCH_ZPWORD1 = $fb ; scratch word in ZP ($fb/$fc)
memory uword SCRATCH_ZPWORD2 = $fd ; scratch word in ZP ($fd/$fe)
const uword ESTACK_LO = $ce00
const uword ESTACK_HI = $cf00
%asm {{
; 16-bit rotate right (as opposed to the 6502's usual 17-bit rotate with carry)
; the word is placed in SCRATCH_ZPWORD1
ror2_word .proc
lsr SCRATCH_ZPWORD1+1
ror SCRATCH_ZPWORD1
bcc +
lda SCRATCH_ZPWORD1+1
ora #$80
sta SCRATCH_ZPWORD1+1
+ rts
.pend
; @todo: implement stubs!
; @todo: move float operations to their own library (only included when floats are enabled)
ub2float .proc
; -- convert ubyte in SCRATCH_ZPB1 to float at address A/Y
; clobbers A, Y
stx SCRATCH_ZPREGX
sta SCRATCH_ZPWORD2
sty SCRATCH_ZPWORD1+1
ldy SCRATCH_ZPB1
jsr c64.FREADUY
_fac_to_mem ldx SCRATCH_ZPWORD2
ldy SCRATCH_ZPWORD2+1
jsr c64.MOVMF
ldx SCRATCH_ZPREGX
rts
.pend
b2float .proc
; -- convert byte in SCRATCH_ZPB1 to float at address A/Y
; clobbers A, Y
stx SCRATCH_ZPREGX
sta SCRATCH_ZPWORD2
sty SCRATCH_ZPWORD2+1
lda SCRATCH_ZPB1
jsr c64.FREADSA
jmp ub2float._fac_to_mem
.pend
uw2float .proc
; -- convert uword in SCRATCH_ZPWORD1 to float at address A/Y
stx SCRATCH_ZPREGX
sta SCRATCH_ZPWORD2
sty SCRATCH_ZPWORD2+1
lda SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jsr c64flt.GIVUAYFAY
jmp ub2float._fac_to_mem
.pend
w2float .proc
; -- convert word in SCRATCH_ZPWORD1 to float at address A/Y
stx SCRATCH_ZPREGX
sta SCRATCH_ZPWORD2
sty SCRATCH_ZPWORD2+1
ldy SCRATCH_ZPWORD1
lda SCRATCH_ZPWORD1+1
jsr c64.GIVAYF
jmp ub2float._fac_to_mem
.pend
stack_b2float .proc
; -- b2float operating on the stack
inx
lda ESTACK_LO,x
stx SCRATCH_ZPREGX
jsr c64.FREADSA
jmp push_fac1_as_result
.pend
stack_w2float .proc
; -- w2float operating on the stack
inx
ldy ESTACK_LO,x
lda ESTACK_HI,x
stx SCRATCH_ZPREGX
jsr c64.GIVAYF
jmp push_fac1_as_result
.pend
stack_ub2float .proc
; -- ub2float operating on the stack
inx
lda ESTACK_LO,x
stx SCRATCH_ZPREGX
tay
jsr c64.FREADUY
jmp push_fac1_as_result
.pend
stack_uw2float .proc
; -- uw2float operating on the stack
inx
lda ESTACK_LO,x
ldy ESTACK_HI,x
stx SCRATCH_ZPREGX
jsr c64flt.GIVUAYFAY
jmp push_fac1_as_result
.pend
stack_float2w .proc
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.AYINT
ldx SCRATCH_ZPREGX
lda $64
sta ESTACK_HI,x
lda $65
sta ESTACK_LO,x
dex
rts
.pend
stack_float2uw .proc
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.GETADR
ldx SCRATCH_ZPREGX
sta ESTACK_HI,x
tya
sta ESTACK_LO,x
dex
rts
.pend
push_float .proc
; ---- push mflpt5 in A/Y onto stack
; (taking 3 stack positions = 6 bytes of which 1 is padding)
sta SCRATCH_ZPWORD1
sty SCRATCH_ZPWORD1+1
ldy #0
lda (SCRATCH_ZPWORD1),y
sta ESTACK_LO,x
iny
lda (SCRATCH_ZPWORD1),y
sta ESTACK_HI,x
dex
iny
lda (SCRATCH_ZPWORD1),y
sta ESTACK_LO,x
iny
lda (SCRATCH_ZPWORD1),y
sta ESTACK_HI,x
dex
iny
lda (SCRATCH_ZPWORD1),y
sta ESTACK_LO,x
dex
rts
.pend
add_a_to_zpword .proc
; -- add ubyte in A to the uword in SCRATCH_ZPWORD1
clc
adc SCRATCH_ZPWORD1
sta SCRATCH_ZPWORD1
bvc +
inc SCRATCH_ZPWORD1+1
+ rts
.pend
pop_index_times_5 .proc
inx
lda ESTACK_LO,x
sta SCRATCH_ZPB1
asl a
asl a
clc
adc SCRATCH_ZPB1 ; A*=5
rts
.pend
push_float_from_indexed_var .proc
; -- push the float from the array at A/Y with index on stack, onto the stack.
sta SCRATCH_ZPWORD1
sty SCRATCH_ZPWORD1+1
jsr pop_index_times_5
jsr add_a_to_zpword
lda SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jmp push_float
.pend
pop_float .proc
; ---- pops mflpt5 from stack to memory A/Y
; (frees 3 stack positions = 6 bytes of which 1 is padding)
sta SCRATCH_ZPWORD1
sty SCRATCH_ZPWORD1+1
ldy #4
inx
lda ESTACK_LO,x
sta (SCRATCH_ZPWORD1),y
dey
inx
lda ESTACK_HI,x
sta (SCRATCH_ZPWORD1),y
dey
lda ESTACK_LO,x
sta (SCRATCH_ZPWORD1),y
dey
inx
lda ESTACK_HI,x
sta (SCRATCH_ZPWORD1),y
dey
lda ESTACK_LO,x
sta (SCRATCH_ZPWORD1),y
rts
.pend
pop_float_fac1 .proc
; -- pops float from stack into FAC1
lda #<fmath_float1
ldy #>fmath_float1
jsr pop_float
lda #<fmath_float1
ldy #>fmath_float1
jmp c64.MOVFM
.pend
pop_float_to_indexed_var .proc
; -- pop the float on the stack, to the memory in the array at A/Y indexed by the byte on stack
sta SCRATCH_ZPWORD1
sty SCRATCH_ZPWORD1+1
jsr pop_index_times_5
jsr add_a_to_zpword
lda SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jmp pop_float
.pend
copy_float .proc
; -- copies the 5 bytes of the mflt value pointed to by SCRATCH_ZPWORD1,
; into the 5 bytes pointed to by A/Y. Clobbers Y.
sta SCRATCH_ZPWORD2
sty SCRATCH_ZPWORD2+1
ldy #0
lda (SCRATCH_ZPWORD1),y
sta (SCRATCH_ZPWORD2),y
iny
lda (SCRATCH_ZPWORD1),y
sta (SCRATCH_ZPWORD2),y
iny
lda (SCRATCH_ZPWORD1),y
sta (SCRATCH_ZPWORD2),y
iny
lda (SCRATCH_ZPWORD1),y
sta (SCRATCH_ZPWORD2),y
iny
lda (SCRATCH_ZPWORD1),y
sta (SCRATCH_ZPWORD2),y
rts
.pend
inc_var_f .proc
; -- add 1 to float pointed to by A/Y
sta SCRATCH_ZPWORD1
sty SCRATCH_ZPWORD1+1
stx SCRATCH_ZPREGX
jsr c64.MOVFM
lda #<c64.FL_FONE
ldy #>c64.FL_FONE
jsr c64.FADD
ldx SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jsr c64.MOVMF
ldx SCRATCH_ZPREGX
rts
.pend
dec_var_f .proc
; -- subtract 1 from float pointed to by A/Y
sta SCRATCH_ZPWORD1
sty SCRATCH_ZPWORD1+1
stx SCRATCH_ZPREGX
lda #<c64.FL_FONE
ldy #>c64.FL_FONE
jsr c64.MOVFM
lda SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jsr c64.FSUB
ldx SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jsr c64.MOVMF
ldx SCRATCH_ZPREGX
rts
.pend
pop_2_floats_f2_in_fac1 .proc
; -- pop 2 floats from stack, load the second one in FAC1 as well
lda #<fmath_float2
ldy #>fmath_float2
jsr pop_float
lda #<fmath_float1
ldy #>fmath_float1
jsr pop_float
lda #<fmath_float2
ldy #>fmath_float2
jmp c64.MOVFM
.pend
fmath_float1 .byte 0,0,0,0,0 ; storage for a mflpt5 value
fmath_float2 .byte 0,0,0,0,0 ; storage for a mflpt5 value
push_fac1_as_result .proc
; -- push the float in FAC1 onto the stack, and return from calculation
ldx #<fmath_float1
ldy #>fmath_float1
jsr c64.MOVMF
lda #<fmath_float1
ldy #>fmath_float1
ldx SCRATCH_ZPREGX
jmp push_float
.pend
floordiv_f .proc
; -- push f1//f2 on stack
jsr pop_2_floats_f2_in_fac1
stx SCRATCH_ZPREGX
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.FDIV
jsr c64.INT
jmp push_fac1_as_result
.pend
div_f .proc
; -- push f1/f2 on stack
jsr pop_2_floats_f2_in_fac1
stx SCRATCH_ZPREGX
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.FDIV
jmp push_fac1_as_result
.pend
add_f .proc
; -- push f1+f2 on stack
jsr pop_2_floats_f2_in_fac1
stx SCRATCH_ZPREGX
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.FADD
jmp push_fac1_as_result
.pend
sub_f .proc
; -- push f1-f2 on stack
jsr pop_2_floats_f2_in_fac1
stx SCRATCH_ZPREGX
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.FSUB
jmp push_fac1_as_result
.pend
mul_f .proc
; -- push f1*f2 on stack
jsr pop_2_floats_f2_in_fac1
stx SCRATCH_ZPREGX
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.FMULT
jmp push_fac1_as_result
.pend
neg_b .proc
lda ESTACK_LO+1,x
eor #255
clc
adc #1
sta ESTACK_LO+1,x
rts
.pend
neg_w .proc
sec
lda #0
sbc ESTACK_LO+1,x
sta ESTACK_LO+1,x
lda #0
sbc ESTACK_HI+1,x
sta ESTACK_HI+1,x
rts
.pend
neg_f .proc
; -- push -flt back on stack
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.NEGOP
jmp push_fac1_as_result
.pend
inv_word .proc
lda ESTACK_LO+1,x
eor #255
sta ESTACK_LO+1,x
lda ESTACK_HI+1,x
eor #255
sta ESTACK_HI+1,x
rts
.pend
not_byte .proc
lda ESTACK_LO+1,x
beq +
lda #0
beq ++
+ lda #1
+ sta ESTACK_LO+1,x
rts
.pend
not_word .proc
lda ESTACK_LO + 1,x
ora ESTACK_HI + 1,x
beq +
lda #0
beq ++
+ lda #1
+ sta ESTACK_LO + 1,x
sta ESTACK_HI + 1,x
rts
.pend
abs_b .proc
; -- push abs(byte) on stack (as byte)
lda ESTACK_LO+1,x
bmi neg_b
rts
.pend
abs_w .proc
; -- push abs(word) on stack (as word)
lda ESTACK_HI+1,x
bmi neg_w
rts
.pend
abs_f .proc
; -- push abs(float) on stack (as float)
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.ABS
jmp push_fac1_as_result
.pend
add_w .proc
; -- push word+word / uword+uword
inx
clc
lda ESTACK_LO,x
adc ESTACK_LO+1,x
sta ESTACK_LO+1,x
lda ESTACK_HI,x
adc ESTACK_HI+1,x
sta ESTACK_HI+1,x
rts
.pend
sub_w .proc
; -- push word-word
inx
sec
lda ESTACK_LO+1,x
sbc ESTACK_LO,x
sta ESTACK_LO+1,x
lda ESTACK_HI+1,x
sbc ESTACK_HI,x
sta ESTACK_HI+1,x
rts
.pend
mul_byte .proc
; -- b*b->b (signed and unsigned)
inx
lda ESTACK_LO,x
ldy ESTACK_LO+1,x
jsr math.multiply_bytes
sta ESTACK_LO+1,x
rts
.pend
mul_word .proc
inx
lda ESTACK_LO,x
sta SCRATCH_ZPWORD1
lda ESTACK_HI,x
sta SCRATCH_ZPWORD1+1
lda ESTACK_LO+1,x
ldy ESTACK_HI+1,x
stx SCRATCH_ZPREGX
jsr math.multiply_words
ldx SCRATCH_ZPREGX
lda math.multiply_words_result
sta ESTACK_LO+1,x
lda math.multiply_words_result+1
sta ESTACK_HI+1,x
rts
.pend
div_b .proc
inx
lda #42
sta ESTACK_LO+1,x
lda #0
sta ESTACK_HI+1,x
rts
.warn "div_b not implemented"
.pend
div_ub .proc
inx
lda #42
sta ESTACK_LO+1,x
lda #0
sta ESTACK_HI+1,x
rts
.warn "div_ub not implemented"
.pend
div_w .proc
inx
lda #42
sta ESTACK_LO+1,x
lda #0
sta ESTACK_HI+1,x
rts
.warn "div_w not implemented"
.pend
div_uw .proc
inx
lda #42
sta ESTACK_LO+1,x
lda #0
sta ESTACK_HI+1,x
rts
.warn "div_uw not implemented"
.pend
remainder_b .proc
inx
lda #42
sta ESTACK_LO+1,x
lda #0
sta ESTACK_HI+1,x
rts
.warn "remainder_b via div_b?"
.pend
remainder_ub .proc
inx
lda ESTACK_LO,x ; right operand
sta SCRATCH_ZPB1
lda ESTACK_LO+1,x ; left operand
- cmp SCRATCH_ZPB1
bcc +
sbc SCRATCH_ZPB1
jmp -
+ sta ESTACK_LO+1,x
rts
.pend
remainder_w .proc
inx
lda #42
sta ESTACK_LO+1,x
lda #0
sta ESTACK_HI+1,x
rts
.warn "remainder_w not implemented - via div_w"
.pend
remainder_uw .proc
inx
lda #42
sta ESTACK_LO+1,x
lda #0
sta ESTACK_HI+1,x
rts
.warn "remainder_uw not implemented - via div_uw"
.pend
equal_w .proc
; -- are the two words on the stack identical?
lda ESTACK_LO+1,x
cmp ESTACK_LO+2,x
bne equal_b._equal_b_false
lda ESTACK_HI+1,x
cmp ESTACK_HI+2,x
bne equal_b._equal_b_false
beq equal_b._equal_b_true
.pend
notequal_b .proc
; -- are the two bytes on the stack different?
inx
lda ESTACK_LO,x
eor ESTACK_LO+1,x
sta ESTACK_LO+1,x
rts
.pend
notequal_w .proc
; -- are the two words on the stack different?
inx
lda ESTACK_LO,x
eor ESTACK_LO+1,x
beq +
sta ESTACK_LO+1,x
rts
+ lda ESTACK_HI,x
eor ESTACK_HI+1,x
sta ESTACK_LO+1,x
rts
.pend
less_ub .proc
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
bcc equal_b._equal_b_true
bcs equal_b._equal_b_false
.pend
less_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda ESTACK_LO+2,x
sec
sbc ESTACK_LO+1,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
less_uw .proc
lda ESTACK_HI+2,x
cmp ESTACK_HI+1,x
bcc equal_b._equal_b_true
bne equal_b._equal_b_false
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
bcc equal_b._equal_b_true
bcs equal_b._equal_b_false
.pend
less_w .proc
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
lda ESTACK_HI+2,x
sbc ESTACK_HI+1,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
equal_b .proc
; -- are the two bytes on the stack identical?
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
bne _equal_b_false
_equal_b_true lda #1
_equal_b_store inx
sta ESTACK_LO+1,x
rts
_equal_b_false lda #0
beq _equal_b_store
.pend
lesseq_ub .proc
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
bcc equal_b._equal_b_true
beq equal_b._equal_b_true ; @todo optimize by flipping comparison
bcs equal_b._equal_b_false
.pend
lesseq_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda ESTACK_LO+2,x
clc
sbc ESTACK_LO+1,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
lesseq_uw .proc
lda ESTACK_HI+1,x
cmp ESTACK_HI+2,x
bcc equal_b._equal_b_false
bne equal_b._equal_b_true
lda ESTACK_LO+1,x
cmp ESTACK_LO+2,x
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
lesseq_w .proc
lda ESTACK_LO+1,x
cmp ESTACK_LO+2,x
lda ESTACK_HI+1,x
sbc ESTACK_HI+2,x
bvc +
eor #$80
+ bpl equal_b._equal_b_true
bmi equal_b._equal_b_false
.pend
greater_ub .proc
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
beq equal_b._equal_b_false
bcs equal_b._equal_b_true ; @todo optimize by flipping comparison?
bcc equal_b._equal_b_false
.pend
greater_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda ESTACK_LO+2,x
clc
sbc ESTACK_LO+1,x
bvc +
eor #$80
+ bpl equal_b._equal_b_true
bmi equal_b._equal_b_false
.pend
greater_uw .proc
lda ESTACK_HI+1,x
cmp ESTACK_HI+2,x
bcc equal_b._equal_b_true
bne equal_b._equal_b_false
lda ESTACK_LO+1,x
cmp ESTACK_LO+2,x
bcc equal_b._equal_b_true
bcs equal_b._equal_b_false
.pend
greater_w .proc
lda ESTACK_LO+1,x
cmp ESTACK_LO+2,x
lda ESTACK_HI+1,x
sbc ESTACK_HI+2,x
bvc +
eor #$80
+ bmi equal_b._equal_b_true
bpl equal_b._equal_b_false
.pend
greatereq_ub .proc
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
greatereq_b .proc
; see http://www.6502.org/tutorials/compare_beyond.html
lda ESTACK_LO+2,x
sec
sbc ESTACK_LO+1,x
bvc +
eor #$80
+ bpl equal_b._equal_b_true
bmi equal_b._equal_b_false
.pend
greatereq_uw .proc
lda ESTACK_HI+2,x
cmp ESTACK_HI+1,x
bcc equal_b._equal_b_false
bne equal_b._equal_b_true
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
bcs equal_b._equal_b_true
bcc equal_b._equal_b_false
.pend
greatereq_w .proc
lda ESTACK_LO+2,x
cmp ESTACK_LO+1,x
lda ESTACK_HI+2,x
sbc ESTACK_HI+1,x
bvc +
eor #$80
+ bpl equal_b._equal_b_true
bmi equal_b._equal_b_false
.pend
equal_f .proc
; -- are the two mflpt5 numbers on the stack identical?
inx
inx
inx
inx
lda ESTACK_LO-3,x
cmp ESTACK_LO,x
bne equal_b._equal_b_false
lda ESTACK_LO-2,x
cmp ESTACK_LO+1,x
bne equal_b._equal_b_false
lda ESTACK_LO-1,x
cmp ESTACK_LO+2,x
bne equal_b._equal_b_false
lda ESTACK_HI-2,x
cmp ESTACK_HI+1,x
bne equal_b._equal_b_false
lda ESTACK_HI-1,x
cmp ESTACK_HI+2,x
bne equal_b._equal_b_false
beq equal_b._equal_b_true
.pend
notequal_f .proc
; -- are the two mflpt5 numbers on the stack different?
jsr equal_f
eor #1 ; invert the result
sta ESTACK_LO+1,x
rts
.pend
less_f .proc
; -- is f1 < f2?
jsr compare_floats
cmp #255
beq compare_floats._return_true
bne compare_floats._return_false
.pend
lesseq_f .proc
; -- is f1 <= f2?
jsr compare_floats
cmp #255
beq compare_floats._return_true
cmp #0
beq compare_floats._return_true
bne compare_floats._return_false
.pend
greater_f .proc
; -- is f1 > f2?
jsr compare_floats
cmp #1
beq compare_floats._return_true
bne compare_floats._return_false
.pend
greatereq_f .proc
; -- is f1 >= f2?
jsr compare_floats
cmp #1
beq compare_floats._return_true
cmp #0
beq compare_floats._return_true
bne compare_floats._return_false
.pend
compare_floats .proc
lda #<fmath_float2
ldy #>fmath_float2
jsr pop_float
lda #<fmath_float1
ldy #>fmath_float1
jsr pop_float
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.MOVFM ; fac1 = flt1
lda #<fmath_float2
ldy #>fmath_float2
stx SCRATCH_ZPREG
jsr c64.FCOMP ; A = flt1 compared with flt2 (0=equal, 1=flt1>flt2, 255=flt1<flt2)
ldx SCRATCH_ZPREG
rts
_return_false lda #0
_return_result sta ESTACK_LO,x
dex
rts
_return_true lda #1
bne _return_result
.pend
func_sin .proc
; -- push sin(f) back onto stack
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.SIN
jmp push_fac1_as_result
.pend
func_cos .proc
; -- push cos(f) back onto stack
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.COS
jmp push_fac1_as_result
.pend
func_tan .proc
; -- push tan(f) back onto stack
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.TAN
jmp push_fac1_as_result
.pend
func_atan .proc
; -- push atan(f) back onto stack
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.ATN
jmp push_fac1_as_result
.pend
func_ln .proc
; -- push ln(f) back onto stack
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.LOG
jmp push_fac1_as_result
.pend
func_log2 .proc
; -- push log base 2, ln(f)/ln(2), back onto stack
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.LOG
jsr c64.MOVEF
lda #<c64.FL_LOG2
ldy #>c64.FL_LOG2
jsr c64.MOVFM
jsr c64.FDIVT
jmp push_fac1_as_result
.pend
func_sqrt .proc
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.SQR
jmp push_fac1_as_result
.pend
func_rad .proc
; -- convert degrees to radians (d * pi / 180)
jsr pop_float_fac1
stx SCRATCH_ZPREGX
lda #<_pi_div_180
ldy #>_pi_div_180
jsr c64.FMULT
jmp push_fac1_as_result
_pi_div_180 .byte 123, 14, 250, 53, 18 ; pi / 180
.pend
func_deg .proc
; -- convert radians to degrees (d * (1/ pi * 180))
jsr pop_float_fac1
stx SCRATCH_ZPREGX
lda #<_one_over_pi_div_180
ldy #>_one_over_pi_div_180
jsr c64.FMULT
jmp push_fac1_as_result
_one_over_pi_div_180 .byte 134, 101, 46, 224, 211 ; 1 / (pi * 180)
.pend
func_round .proc
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.FADDH
jsr c64.INT
jmp push_fac1_as_result
.pend
func_floor .proc
jsr pop_float_fac1
stx SCRATCH_ZPREGX
jsr c64.INT
jmp push_fac1_as_result
.pend
func_ceil .proc
; -- ceil: tr = int(f); if tr==f -> return else return tr+1
jsr pop_float_fac1
stx SCRATCH_ZPREGX
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.MOVMF
jsr c64.INT
lda #<fmath_float1
ldy #>fmath_float1
jsr c64.FCOMP
cmp #0
beq +
lda #<c64.FL_FONE
ldy #>c64.FL_FONE
jsr c64.FADD
+ jmp push_fac1_as_result
.pend
peek_address .proc
; -- peek address on stack into SCRATCH_ZPWORD1
lda ESTACK_LO+1,x
sta SCRATCH_ZPWORD1
lda ESTACK_HI+1,x
sta SCRATCH_ZPWORD1+1
rts
.pend
func_any_b .proc
inx
lda ESTACK_LO,x ; array size
_entry sta _cmp_mod+1 ; self-modifying code
jsr peek_address
ldy #0
- lda (SCRATCH_ZPWORD1),y
bne _got_any
iny
_cmp_mod cpy #255 ; modified
bne -
lda #0
sta ESTACK_LO+1,x
rts
_got_any lda #1
sta ESTACK_LO+1,x
rts
.pend
func_any_w .proc
inx
lda ESTACK_LO,x ; array size
asl a ; times 2 because of word
jmp func_any_b._entry
.pend
func_any_f .proc
inx
lda ESTACK_LO,x ; array size
sta SCRATCH_ZPB1
asl a
asl a
clc
adc SCRATCH_ZPB1 ; times 5 because of float
jmp func_any_b._entry
.pend
func_all_b .proc
inx
lda ESTACK_LO,x ; array size
sta _cmp_mod+1 ; self-modifying code
jsr peek_address
ldy #0
- lda (SCRATCH_ZPWORD1),y
beq _got_not_all
iny
_cmp_mod cpy #255 ; modified
bne -
lda #1
sta ESTACK_LO+1,x
rts
_got_not_all lda #0
sta ESTACK_LO+1,x
rts
.pend
func_all_w .proc
inx
lda ESTACK_LO,x ; array size
asl a ; times 2 because of word
sta _cmp_mod+1 ; self-modifying code
jsr peek_address
ldy #0
- lda (SCRATCH_ZPWORD1),y
bne +
iny
lda (SCRATCH_ZPWORD1),y
bne +
lda #0
sta ESTACK_LO+1,x
rts
+ iny
_cmp_mod cpy #255 ; modified
bne -
lda #1
sta ESTACK_LO+1,x
rts
.pend
func_all_f .proc
inx
lda ESTACK_LO,x ; array size
sta SCRATCH_ZPB1
asl a
asl a
clc
adc SCRATCH_ZPB1 ; times 5 because of float
sta _cmp_mod+1 ; self-modifying code
jsr peek_address
ldy #0
- lda (SCRATCH_ZPWORD1),y
bne +
iny
lda (SCRATCH_ZPWORD1),y
bne +
iny
lda (SCRATCH_ZPWORD1),y
bne +
iny
lda (SCRATCH_ZPWORD1),y
bne +
iny
lda (SCRATCH_ZPWORD1),y
bne +
lda #0
sta ESTACK_LO+1,x
rts
+ iny
_cmp_mod cpy #255 ; modified
bne -
lda #1
sta ESTACK_LO+1,x
rts
.pend
func_max_ub .proc
jsr pop_array_and_lengthmin1Y
lda #0
sta SCRATCH_ZPB1
- lda (SCRATCH_ZPWORD1),y
cmp SCRATCH_ZPB1
bcc +
sta SCRATCH_ZPB1
+ dey
cpy #255
bne -
lda SCRATCH_ZPB1
sta ESTACK_LO,x
dex
rts
.pend
func_max_b .proc
jsr pop_array_and_lengthmin1Y
lda #-128
sta SCRATCH_ZPB1
- lda (SCRATCH_ZPWORD1),y
sec
sbc SCRATCH_ZPB1
bvc +
eor #$80
+ bmi +
lda (SCRATCH_ZPWORD1),y
sta SCRATCH_ZPB1
+ dey
cpy #255
bne -
lda SCRATCH_ZPB1
sta ESTACK_LO,x
dex
rts
.pend
func_max_uw .proc
lda #0
sta _result_maxuw
sta _result_maxuw+1
jsr pop_array_and_lengthmin1Y
tya
asl a
tay ; times 2 because of word array
_loop
iny
lda (SCRATCH_ZPWORD1),y
dey
cmp _result_maxuw+1
bcc _lesseq
bne _greater
lda (SCRATCH_ZPWORD1),y
cmp _result_maxuw
bcc _lesseq
_greater lda (SCRATCH_ZPWORD1),y
sta _result_maxuw
iny
lda (SCRATCH_ZPWORD1),y
sta _result_maxuw+1
dey
_lesseq dey
dey
bpl _loop
lda _result_maxuw
sta ESTACK_LO,x
lda _result_maxuw+1
sta ESTACK_HI,x
dex
rts
_result_maxuw .word 0
.pend
func_max_w .proc
lda #$00
sta _result_maxw
lda #$80
sta _result_maxw+1
jsr pop_array_and_lengthmin1Y
tya
asl a
tay ; times 2 because of word array
_loop
lda (SCRATCH_ZPWORD1),y
cmp _result_maxw
iny
lda (SCRATCH_ZPWORD1),y
dey
sbc _result_maxw+1
bvc +
eor #$80
+ bmi _lesseq
lda (SCRATCH_ZPWORD1),y
sta _result_maxw
iny
lda (SCRATCH_ZPWORD1),y
sta _result_maxw+1
dey
_lesseq dey
dey
bpl _loop
lda _result_maxw
sta ESTACK_LO,x
lda _result_maxw+1
sta ESTACK_HI,x
dex
rts
_result_maxw .word 0
.pend
func_max_f .proc
lda #<_min_float
ldy #>_min_float
jsr c64.MOVFM ; fac1=min(float)
lda #255
sta _cmp_mod+1 ; compare using 255 so we keep larger values
_minmax_entry jsr pop_array_and_lengthmin1Y
stx SCRATCH_ZPREGX
sty SCRATCH_ZPREG
- lda SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jsr c64.FCOMP
_cmp_mod cmp #255 ; will be modified
bne +
; fac1 is smaller/larger, so store the new value instead
lda SCRATCH_ZPWORD1
ldy SCRATCH_ZPWORD1+1
jsr c64.MOVFM
+ lda #5
clc
adc SCRATCH_ZPWORD1
sta SCRATCH_ZPWORD1
bcc +
inc SCRATCH_ZPWORD1+1
+ ldy SCRATCH_ZPREG
dey
sty SCRATCH_ZPREG
bpl -
jmp push_fac1_as_result
_min_float .byte 255,255,255,255,255 ; -1.7014118345e+38
.pend
pop_array_and_lengthmin1Y .proc
inx
ldy ESTACK_LO,x
dey ; length minus 1, for iteration
lda ESTACK_LO+1,x
sta SCRATCH_ZPWORD1
lda ESTACK_HI+1,x
sta SCRATCH_ZPWORD1+1
inx
rts
.pend
func_min_ub .proc
jsr pop_array_and_lengthmin1Y
lda #255
sta SCRATCH_ZPB1
- lda (SCRATCH_ZPWORD1),y
cmp SCRATCH_ZPB1
bcs +
sta SCRATCH_ZPB1
+ dey
cpy #255
bne -
lda SCRATCH_ZPB1
sta ESTACK_LO,x
dex
rts
.pend
func_min_b .proc
jsr pop_array_and_lengthmin1Y
lda #127
sta SCRATCH_ZPB1
- lda (SCRATCH_ZPWORD1),y
clc
sbc SCRATCH_ZPB1
bvc +
eor #$80
+ bpl +
lda (SCRATCH_ZPWORD1),y
sta SCRATCH_ZPB1
+ dey
cpy #255
bne -
lda SCRATCH_ZPB1
sta ESTACK_LO,x
dex
rts
.pend
func_min_uw .proc
lda #$ff
sta _result_minuw
sta _result_minuw+1
jsr pop_array_and_lengthmin1Y
tya
asl a
tay ; times 2 because of word array
_loop
iny
lda (SCRATCH_ZPWORD1),y
dey
cmp _result_minuw+1
bcc _less
bne _gtequ
lda (SCRATCH_ZPWORD1),y
cmp _result_minuw
bcs _gtequ
_less lda (SCRATCH_ZPWORD1),y
sta _result_minuw
iny
lda (SCRATCH_ZPWORD1),y
sta _result_minuw+1
dey
_gtequ dey
dey
bpl _loop
lda _result_minuw
sta ESTACK_LO,x
lda _result_minuw+1
sta ESTACK_HI,x
dex
rts
_result_minuw .word 0
.pend
func_min_w .proc
lda #$ff
sta _result_minw
lda #$7f
sta _result_minw+1
jsr pop_array_and_lengthmin1Y
tya
asl a
tay ; times 2 because of word array
_loop
lda (SCRATCH_ZPWORD1),y
cmp _result_minw
iny
lda (SCRATCH_ZPWORD1),y
dey
sbc _result_minw+1
bvc +
eor #$80
+ bpl _gtequ
lda (SCRATCH_ZPWORD1),y
sta _result_minw
iny
lda (SCRATCH_ZPWORD1),y
sta _result_minw+1
dey
_gtequ dey
dey
bpl _loop
lda _result_minw
sta ESTACK_LO,x
lda _result_minw+1
sta ESTACK_HI,x
dex
rts
_result_minw .word 0
.pend
func_min_f .proc
lda #<_max_float
ldy #>_max_float
jsr c64.MOVFM ; fac1=max(float)
lda #1
sta func_max_f._cmp_mod+1 ; compare using 1 so we keep smaller values
jmp func_max_f._minmax_entry
_max_float .byte 255,127,255,255,255 ; 1.7014118345e+38
.pend
func_len_str .proc
; -- push length of 0-terminated string on stack
jsr peek_address
ldy #0
- lda (SCRATCH_ZPWORD1),y
beq +
iny
bne -
+ tya
sta ESTACK_LO+1,x
rts
.pend
func_len_strp .proc
; -- push length of pascal-string on stack
jsr peek_address
ldy #0
lda (SCRATCH_ZPWORD1),y ; first byte is length
sta ESTACK_LO+1,x
rts
.pend
func_rnd .proc
; -- put a random ubyte on the estack
jsr math.randbyte
sta ESTACK_LO,x
dex
rts
.pend
func_rndw .proc
; -- put a random uword on the estack
jsr math.randword
sta ESTACK_LO,x
tya
sta ESTACK_HI,x
dex
rts
.pend
func_rndf .proc
; -- put a random floating point value on the stack
stx SCRATCH_ZPREG
lda #1
jsr c64.FREADSA
jsr c64.RND ; rng into fac1
ldx #<_rndf_rnum5
ldy #>_rndf_rnum5
jsr c64.MOVMF ; fac1 to mem X/Y
ldx SCRATCH_ZPREG
lda #<_rndf_rnum5
ldy #>_rndf_rnum5
jmp push_float
_rndf_rnum5 .byte 0,0,0,0,0
.pend
}}
}
~ math {
; some more interesting routines can be found here:
; http://6502org.wikidot.com/software-math
; http://codebase64.org/doku.php?id=base:6502_6510_maths
;
; note: the following ZP scratch registers must be the same as in c64lib
memory ubyte SCRATCH_ZPB1 = $02 ; scratch byte 1 in ZP
memory ubyte SCRATCH_ZPREG = $03 ; scratch register in ZP
memory uword SCRATCH_ZPWORD1 = $fb ; scratch word in ZP ($fb/$fc)
memory uword SCRATCH_ZPWORD2 = $fd ; scratch word in ZP ($fd/$fe)
asmsub multiply_bytes (ubyte byte1 @ A, ubyte byte2 @ Y) -> clobbers() -> (ubyte @ A) {
; ---- multiply 2 bytes, result as byte in A (signed or unsigned)
%asm {{
sta SCRATCH_ZPB1 ; num1
sty SCRATCH_ZPREG ; num2
lda #0
beq _enterloop
_doAdd clc
adc SCRATCH_ZPB1
_loop asl SCRATCH_ZPB1
_enterloop lsr SCRATCH_ZPREG
bcs _doAdd
bne _loop
rts
}}
}
asmsub multiply_bytes_16 (ubyte byte1 @ A, ubyte byte2 @ Y) -> clobbers(X) -> (uword @ AY) {
; ---- multiply 2 bytes, result as word in A/Y (unsigned)
%asm {{
sta SCRATCH_ZPB1
sty SCRATCH_ZPREG
lda #0
ldx #8
lsr SCRATCH_ZPB1
- bcc +
clc
adc SCRATCH_ZPREG
+ ror a
ror SCRATCH_ZPB1
dex
bne -
tay
lda SCRATCH_ZPB1
rts
}}
}
asmsub multiply_words (uword number @ AY) -> clobbers(A,X) -> () {
; ---- multiply two 16-bit words into a 32-bit result (signed and unsigned)
; input: A/Y = first 16-bit number, SCRATCH_ZPWORD1 in ZP = second 16-bit number
; output: multiply_words.result 4-bytes/32-bits product, LSB order (low-to-high)
%asm {{
sta SCRATCH_ZPWORD2
sty SCRATCH_ZPWORD2+1
mult16 lda #$00
sta multiply_words_result+2 ; clear upper bits of product
sta multiply_words_result+3
ldx #16 ; for all 16 bits...
- lsr SCRATCH_ZPWORD1+1 ; divide multiplier by 2
ror SCRATCH_ZPWORD1
bcc +
lda multiply_words_result+2 ; get upper half of product and add multiplicand
clc
adc SCRATCH_ZPWORD2
sta multiply_words_result+2
lda multiply_words_result+3
adc SCRATCH_ZPWORD2+1
+ ror a ; rotate partial product
sta multiply_words_result+3
ror multiply_words_result+2
ror multiply_words_result+1
ror multiply_words_result
dex
bne -
rts
multiply_words_result .byte 0,0,0,0
}}
}
asmsub divmod_bytes (ubyte number @ X, ubyte divisor @ Y) -> clobbers() -> (ubyte @ X, ubyte @ A) {
; ---- divide X by Y, result quotient in X, remainder in A (unsigned)
; division by zero will result in quotient = 255 and remainder = original number
%asm {{
stx SCRATCH_ZPB1
sty SCRATCH_ZPREG
lda #0
ldx #8
asl SCRATCH_ZPB1
- rol a
cmp SCRATCH_ZPREG
bcc +
sbc SCRATCH_ZPREG
+ rol SCRATCH_ZPB1
dex
bne -
ldx SCRATCH_ZPB1
rts
}}
}
asmsub divmod_words (uword divisor @ AY) -> clobbers(X) -> (uword @ AY) {
; ---- divide two words (16 bit each) into 16 bit results
; input: SCRATCH_ZPWORD1 in ZP: 16 bit number, A/Y: 16 bit divisor
; output: SCRATCH_ZPWORD1 in ZP: 16 bit result, A/Y: 16 bit remainder
; division by zero will result in quotient = 65535 and remainder = divident
%asm {{
remainder = SCRATCH_ZPB1
sta SCRATCH_ZPWORD2
sty SCRATCH_ZPWORD2+1
lda #0 ;preset remainder to 0
sta remainder
sta remainder+1
ldx #16 ;repeat for each bit: ...
- asl SCRATCH_ZPWORD1 ;number lb & hb*2, msb -> Carry
rol SCRATCH_ZPWORD1+1
rol remainder ;remainder lb & hb * 2 + msb from carry
rol remainder+1
lda remainder
sec
sbc SCRATCH_ZPWORD2 ;substract divisor to see if it fits in
tay ;lb result -> Y, for we may need it later
lda remainder+1
sbc SCRATCH_ZPWORD2+1
bcc + ;if carry=0 then divisor didn't fit in yet
sta remainder+1 ;else save substraction result as new remainder,
sty remainder
inc SCRATCH_ZPWORD1 ;and INCrement result cause divisor fit in 1 times
+ dex
bne -
lda remainder ; copy remainder to ZPWORD2 result register
sta SCRATCH_ZPWORD2
lda remainder+1
sta SCRATCH_ZPWORD2+1
lda SCRATCH_ZPWORD1 ; load division result in A/Y
ldy SCRATCH_ZPWORD1+1
rts
}}
}
asmsub randseed (uword seed @ AY) -> clobbers(A, Y) -> () {
; ---- reset the random seeds for the byte and word random generators
; default starting values are: A=$2c Y=$9e
%asm {{
sta randword._seed
sty randword._seed+1
stx SCRATCH_ZPREG
clc
adc #14
sta randbyte._seed
ora #$80 ; make negative
jsr c64.FREADSA
jsr c64.RND ; reseed the float rng using the (negative) number in A
ldx SCRATCH_ZPREG
rts
}}
}
asmsub randbyte () -> clobbers() -> (ubyte @ A) {
; ---- 8-bit pseudo random number generator into A
%asm {{
lda _seed
beq +
asl a
beq ++ ;if the input was $80, skip the EOR
bcc ++
+ eor _magic ; #$1d ; could be self-modifying code to set new magic
+ sta _seed
rts
_seed .byte $3a
_magic .byte $1d
_magiceors .byte $1d, $2b, $2d, $4d, $5f, $63, $65, $69
.byte $71, $87, $8d, $a9, $c3, $cf, $e7, $f5
}}
}
asmsub randword () -> clobbers() -> (uword @ AY) {
; ---- 16 bit pseudo random number generator into AY
%asm {{
lda _seed
beq _lowZero ; $0000 and $8000 are special values to test for
; Do a normal shift
asl _seed
lda _seed+1
rol a
bcc _noEor
_doEor ; high byte is in A
eor _magic+1 ; #>magic ; could be self-modifying code to set new magic
sta _seed+1
lda _seed
eor _magic ; #<magic ; could be self-modifying code to set new magic
sta _seed
ldy _seed+1
rts
_lowZero lda _seed+1
beq _doEor ; High byte is also zero, so apply the EOR
; For speed, you could store 'magic' into 'seed' directly
; instead of running the EORs
; wasn't zero, check for $8000
asl a
beq _noEor ; if $00 is left after the shift, then it was $80
bcs _doEor ; else, do the EOR based on the carry bit as usual
_noEor sta _seed+1
tay
lda _seed
rts
_seed .word $2c9e
_magic .word $3f1d
_magiceors .word $3f1d, $3f81, $3fa5, $3fc5, $4075, $409d, $40cd, $4109
.word $413f, $414b, $4153, $4159, $4193, $4199, $41af, $41bb
}}
}
}
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