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prog8/compiler/res/prog8lib/c64floats.asm
Irmen de Jong 1f69deaccd reg_x removal: c64floats
2020-09-13 20:44:55 +02:00

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; --- low level floating point assembly routines for the C64
FL_ONE_const .byte 129 ; 1.0
FL_ZERO_const .byte 0,0,0,0,0 ; 0.0
floats_store_reg .byte 0 ; temp storage
ub2float .proc
; -- convert ubyte in SCRATCH_ZPB1 to float at address A/Y
; clobbers A, Y
stx P8ZP_SCRATCH_REG
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
ldy P8ZP_SCRATCH_B1
lda #0
jsr GIVAYF
_fac_to_mem ldx P8ZP_SCRATCH_W2
ldy P8ZP_SCRATCH_W2+1
jsr MOVMF
ldx P8ZP_SCRATCH_REG
rts
.pend
b2float .proc
; -- convert byte in SCRATCH_ZPB1 to float at address A/Y
; clobbers A, Y
stx P8ZP_SCRATCH_REG
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
lda P8ZP_SCRATCH_B1
jsr FREADSA
jmp ub2float._fac_to_mem
.pend
uw2float .proc
; -- convert uword in SCRATCH_ZPWORD1 to float at address A/Y
stx P8ZP_SCRATCH_REG
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
lda P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
jsr GIVUAYFAY
jmp ub2float._fac_to_mem
.pend
w2float .proc
; -- convert word in SCRATCH_ZPWORD1 to float at address A/Y
stx P8ZP_SCRATCH_REG
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
ldy P8ZP_SCRATCH_W1
lda P8ZP_SCRATCH_W1+1
jsr GIVAYF
jmp ub2float._fac_to_mem
.pend
stack_b2float .proc
; -- b2float operating on the stack
inx
lda P8ESTACK_LO,x
stx P8ZP_SCRATCH_REG
jsr FREADSA
jmp push_fac1_as_result
.pend
stack_w2float .proc
; -- w2float operating on the stack
inx
ldy P8ESTACK_LO,x
lda P8ESTACK_HI,x
stx P8ZP_SCRATCH_REG
jsr GIVAYF
jmp push_fac1_as_result
.pend
stack_ub2float .proc
; -- ub2float operating on the stack
inx
lda P8ESTACK_LO,x
stx P8ZP_SCRATCH_REG
tay
lda #0
jsr GIVAYF
jmp push_fac1_as_result
.pend
stack_uw2float .proc
; -- uw2float operating on the stack
inx
lda P8ESTACK_LO,x
ldy P8ESTACK_HI,x
stx P8ZP_SCRATCH_REG
jsr GIVUAYFAY
jmp push_fac1_as_result
.pend
stack_float2w .proc ; also used for float2b
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr AYINT
ldx P8ZP_SCRATCH_REG
lda $64
sta P8ESTACK_HI,x
lda $65
sta P8ESTACK_LO,x
dex
rts
.pend
stack_float2uw .proc ; also used for float2ub
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr GETADR
ldx P8ZP_SCRATCH_REG
sta P8ESTACK_HI,x
tya
sta P8ESTACK_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 P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
lda (P8ZP_SCRATCH_W1),y
sta P8ESTACK_LO,x
iny
lda (P8ZP_SCRATCH_W1),y
sta P8ESTACK_HI,x
dex
iny
lda (P8ZP_SCRATCH_W1),y
sta P8ESTACK_LO,x
iny
lda (P8ZP_SCRATCH_W1),y
sta P8ESTACK_HI,x
dex
iny
lda (P8ZP_SCRATCH_W1),y
sta P8ESTACK_LO,x
dex
rts
.pend
func_rndf .proc
; -- put a random floating point value on the stack
stx P8ZP_SCRATCH_REG
lda #1
jsr FREADSA
jsr RND ; rng into fac1
ldx #<_rndf_rnum5
ldy #>_rndf_rnum5
jsr MOVMF ; fac1 to mem X/Y
ldx P8ZP_SCRATCH_REG
lda #<_rndf_rnum5
ldy #>_rndf_rnum5
jmp push_float
_rndf_rnum5 .byte 0,0,0,0,0
.pend
pop_float .proc
; ---- pops mflpt5 from stack to memory A/Y
; (frees 3 stack positions = 6 bytes of which 1 is padding)
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #4
inx
lda P8ESTACK_LO,x
sta (P8ZP_SCRATCH_W1),y
dey
inx
lda P8ESTACK_HI,x
sta (P8ZP_SCRATCH_W1),y
dey
lda P8ESTACK_LO,x
sta (P8ZP_SCRATCH_W1),y
dey
inx
lda P8ESTACK_HI,x
sta (P8ZP_SCRATCH_W1),y
dey
lda P8ESTACK_LO,x
sta (P8ZP_SCRATCH_W1),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 MOVFM
.pend
pop_float_fac2 .proc
; -- pops float from stack into FAC2
lda #<fmath_float1
ldy #>fmath_float1
jsr pop_float
lda #<fmath_float1
ldy #>fmath_float1
jmp CONUPK
.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 P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
jsr prog8_lib.pop_index_times_5
jsr prog8_lib.add_a_to_zpword
lda P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+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 A,Y.
sta _target+1
sty _target+2
ldy #4
_loop lda (P8ZP_SCRATCH_W1),y
_target sta $ffff,y ; modified
dey
bpl _loop
rts
.pend
inc_var_f .proc
; -- add 1 to float pointed to by A/Y
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
stx P8ZP_SCRATCH_REG
jsr MOVFM
lda #<FL_ONE_const
ldy #>FL_ONE_const
jsr FADD
ldx P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
jsr MOVMF
ldx P8ZP_SCRATCH_REG
rts
.pend
dec_var_f .proc
; -- subtract 1 from float pointed to by A/Y
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
stx P8ZP_SCRATCH_REG
lda #<FL_ONE_const
ldy #>FL_ONE_const
jsr MOVFM
lda P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
jsr FSUB
ldx P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
jsr MOVMF
ldx P8ZP_SCRATCH_REG
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 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 MOVMF
lda #<fmath_float1
ldy #>fmath_float1
ldx P8ZP_SCRATCH_REG
jmp push_float
.pend
pow_f .proc
; -- push f1 ** f2 on stack
lda #<fmath_float2
ldy #>fmath_float2
jsr pop_float
lda #<fmath_float1
ldy #>fmath_float1
jsr pop_float
stx P8ZP_SCRATCH_REG
lda #<fmath_float1
ldy #>fmath_float1
jsr CONUPK ; fac2 = float1
lda #<fmath_float2
ldy #>fmath_float2
jsr FPWR
ldx P8ZP_SCRATCH_REG
jmp push_fac1_as_result
.pend
div_f .proc
; -- push f1/f2 on stack
jsr pop_2_floats_f2_in_fac1
stx P8ZP_SCRATCH_REG
lda #<fmath_float1
ldy #>fmath_float1
jsr FDIV
jmp push_fac1_as_result
.pend
add_f .proc
; -- push f1+f2 on stack
jsr pop_2_floats_f2_in_fac1
stx P8ZP_SCRATCH_REG
lda #<fmath_float1
ldy #>fmath_float1
jsr FADD
jmp push_fac1_as_result
.pend
sub_f .proc
; -- push f1-f2 on stack
jsr pop_2_floats_f2_in_fac1
stx P8ZP_SCRATCH_REG
lda #<fmath_float1
ldy #>fmath_float1
jsr FSUB
jmp push_fac1_as_result
.pend
mul_f .proc
; -- push f1*f2 on stack
jsr pop_2_floats_f2_in_fac1
stx P8ZP_SCRATCH_REG
lda #<fmath_float1
ldy #>fmath_float1
jsr FMULT
jmp push_fac1_as_result
.pend
neg_f .proc
; -- push -flt back on stack
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr NEGOP
jmp push_fac1_as_result
.pend
abs_f .proc
; -- push abs(float) on stack (as float)
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr ABS
jmp push_fac1_as_result
.pend
equal_f .proc
; -- are the two mflpt5 numbers on the stack identical?
inx
inx
inx
inx
lda P8ESTACK_LO-3,x
cmp P8ESTACK_LO,x
bne _equals_false
lda P8ESTACK_LO-2,x
cmp P8ESTACK_LO+1,x
bne _equals_false
lda P8ESTACK_LO-1,x
cmp P8ESTACK_LO+2,x
bne _equals_false
lda P8ESTACK_HI-2,x
cmp P8ESTACK_HI+1,x
bne _equals_false
lda P8ESTACK_HI-1,x
cmp P8ESTACK_HI+2,x
bne _equals_false
_equals_true lda #1
_equals_store inx
sta P8ESTACK_LO+1,x
rts
_equals_false lda #0
beq _equals_store
.pend
notequal_f .proc
; -- are the two mflpt5 numbers on the stack different?
jsr equal_f
eor #1 ; invert the result
sta P8ESTACK_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 MOVFM ; fac1 = flt1
lda #<fmath_float2
ldy #>fmath_float2
stx P8ZP_SCRATCH_REG
jsr FCOMP ; A = flt1 compared with flt2 (0=equal, 1=flt1>flt2, 255=flt1<flt2)
ldx P8ZP_SCRATCH_REG
rts
_return_false lda #0
_return_result sta P8ESTACK_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 P8ZP_SCRATCH_REG
jsr SIN
jmp push_fac1_as_result
.pend
func_cos .proc
; -- push cos(f) back onto stack
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr COS
jmp push_fac1_as_result
.pend
func_tan .proc
; -- push tan(f) back onto stack
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr TAN
jmp push_fac1_as_result
.pend
func_atan .proc
; -- push atan(f) back onto stack
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr ATN
jmp push_fac1_as_result
.pend
func_ln .proc
; -- push ln(f) back onto stack
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr 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 P8ZP_SCRATCH_REG
jsr LOG
jsr MOVEF
lda #<c64.FL_LOG2
ldy #>c64.FL_LOG2
jsr MOVFM
jsr FDIVT
jmp push_fac1_as_result
.pend
func_sqrt .proc
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr SQR
jmp push_fac1_as_result
.pend
func_rad .proc
; -- convert degrees to radians (d * pi / 180)
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
lda #<_pi_div_180
ldy #>_pi_div_180
jsr 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 P8ZP_SCRATCH_REG
lda #<_one_over_pi_div_180
ldy #>_one_over_pi_div_180
jsr 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 P8ZP_SCRATCH_REG
jsr FADDH
jsr INT
jmp push_fac1_as_result
.pend
func_floor .proc
jsr pop_float_fac1
stx P8ZP_SCRATCH_REG
jsr 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 P8ZP_SCRATCH_REG
ldx #<fmath_float1
ldy #>fmath_float1
jsr MOVMF
jsr INT
lda #<fmath_float1
ldy #>fmath_float1
jsr FCOMP
cmp #0
beq +
lda #<FL_ONE_const
ldy #>FL_ONE_const
jsr FADD
+ jmp push_fac1_as_result
.pend
func_any_f .proc
inx
lda P8ESTACK_LO,x ; array size
sta P8ZP_SCRATCH_B1
asl a
asl a
clc
adc P8ZP_SCRATCH_B1 ; times 5 because of float
jmp prog8_lib.func_any_b._entry
.pend
func_all_f .proc
inx
jsr prog8_lib.peek_address
lda P8ESTACK_LO,x ; array size
sta P8ZP_SCRATCH_B1
asl a
asl a
clc
adc P8ZP_SCRATCH_B1 ; times 5 because of float
tay
dey
- lda (P8ZP_SCRATCH_W1),y
clc
dey
adc (P8ZP_SCRATCH_W1),y
dey
adc (P8ZP_SCRATCH_W1),y
dey
adc (P8ZP_SCRATCH_W1),y
dey
adc (P8ZP_SCRATCH_W1),y
dey
cmp #0
beq +
cpy #255
bne -
lda #1
sta P8ESTACK_LO+1,x
rts
+ sta P8ESTACK_LO+1,x
rts
.pend
func_max_f .proc
lda #255
sta _minmax_cmp+1
lda #<_largest_neg_float
ldy #>_largest_neg_float
_minmax_entry jsr MOVFM
jsr prog8_lib.pop_array_and_lengthmin1Y
stx floats_store_reg
- sty P8ZP_SCRATCH_REG
lda P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
jsr FCOMP
_minmax_cmp cmp #255 ; modified
bne +
lda P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
jsr MOVFM
+ lda P8ZP_SCRATCH_W1
clc
adc #5
sta P8ZP_SCRATCH_W1
bcc +
inc P8ZP_SCRATCH_W1+1
+ ldy P8ZP_SCRATCH_REG
dey
cpy #255
bne -
ldx floats_store_reg
stx P8ZP_SCRATCH_REG
jmp push_fac1_as_result
_largest_neg_float .byte 255,255,255,255,255 ; largest negative float -1.7014118345e+38
.pend
func_min_f .proc
lda #1
sta func_max_f._minmax_cmp+1
lda #<_largest_pos_float
ldy #>_largest_pos_float
jmp func_max_f._minmax_entry
_largest_pos_float .byte 255,127,255,255,255 ; largest positive float
rts
.pend
func_sum_f .proc
lda #<FL_ZERO_const
ldy #>FL_ZERO_const
jsr MOVFM
jsr prog8_lib.pop_array_and_lengthmin1Y
stx floats_store_reg
- sty P8ZP_SCRATCH_REG
lda P8ZP_SCRATCH_W1
ldy P8ZP_SCRATCH_W1+1
jsr FADD
ldy P8ZP_SCRATCH_REG
dey
cpy #255
beq +
lda P8ZP_SCRATCH_W1
clc
adc #5
sta P8ZP_SCRATCH_W1
bcc -
inc P8ZP_SCRATCH_W1+1
bne -
+ ldx floats_store_reg
stx P8ZP_SCRATCH_REG
jmp push_fac1_as_result
.pend
sign_f .proc
jsr pop_float_fac1
jsr SIGN
sta P8ESTACK_LO,x
dex
rts
.pend
set_0_array_float .proc
; -- set a float in an array to zero (index on stack, array in SCRATCH_ZPWORD1)
inx
lda P8ESTACK_LO,x
asl a
asl a
clc
adc P8ESTACK_LO,x
tay
lda #0
sta (P8ZP_SCRATCH_W1),y
iny
sta (P8ZP_SCRATCH_W1),y
iny
sta (P8ZP_SCRATCH_W1),y
iny
sta (P8ZP_SCRATCH_W1),y
iny
sta (P8ZP_SCRATCH_W1),y
rts
.pend
set_array_float .proc
; -- set a float in an array to a value (index on stack, float in SCRATCH_ZPWORD1, array in SCRATCH_ZPWORD2)
inx
lda P8ESTACK_LO,x
asl a
asl a
clc
adc P8ESTACK_LO,x
adc P8ZP_SCRATCH_W2
ldy P8ZP_SCRATCH_W2+1
bcc +
iny
+ jmp copy_float
; -- copies the 5 bytes of the mflt value pointed to by SCRATCH_ZPWORD1,
; into the 5 bytes pointed to by A/Y. Clobbers A,Y.
.pend
swap_floats .proc
; -- swap floats pointed to by SCRATCH_ZPWORD1, SCRATCH_ZPWORD2
ldy #4
- lda (P8ZP_SCRATCH_W1),y
pha
lda (P8ZP_SCRATCH_W2),y
sta (P8ZP_SCRATCH_W1),y
pla
sta (P8ZP_SCRATCH_W2),y
dey
bpl -
rts
.pend
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