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9e8c8973d8
prog8/compiler/res/prog8lib/c64/floats.asm
Irmen de Jong 9e8c8973d8 remove eval stack references from asm code
2023-07-15 22:24:22 +02:00

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NASM
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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
FL_LOG2_const .byte $80, $31, $72, $17, $f8 ; log(2)
floats_store_reg .byte 0 ; temp storage
floats_temp_var .byte 0,0,0,0,0 ; temporary storage for a float
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
cast_from_uw .proc
; -- uword in A/Y into float var at (P8ZP_SCRATCH_W2)
stx P8ZP_SCRATCH_REG
jsr GIVUAYFAY
jmp ub2float._fac_to_mem
.pend
cast_from_w .proc
; -- word in A/Y into float var at (P8ZP_SCRATCH_W2)
stx P8ZP_SCRATCH_REG
jsr GIVAYFAY
jmp ub2float._fac_to_mem
.pend
cast_from_ub .proc
; -- ubyte in Y into float var at (P8ZP_SCRATCH_W2)
stx P8ZP_SCRATCH_REG
jsr FREADUY
jmp ub2float._fac_to_mem
.pend
cast_from_b .proc
; -- byte in A into float var at (P8ZP_SCRATCH_W2)
stx P8ZP_SCRATCH_REG
jsr FREADSA
jmp ub2float._fac_to_mem
.pend
cast_as_uw_into_ya .proc ; also used for float 2 ub
; -- cast float at A/Y to uword into Y/A
jsr MOVFM
jmp cast_FAC1_as_uw_into_ya
.pend
cast_as_w_into_ay .proc ; also used for float 2 b
; -- cast float at A/Y to word into A/Y
jsr MOVFM
jmp cast_FAC1_as_w_into_ay
.pend
cast_FAC1_as_uw_into_ya .proc ; also used for float 2 ub
; -- cast fac1 to uword into Y/A
stx P8ZP_SCRATCH_REG
jsr GETADR ; into Y/A
ldx P8ZP_SCRATCH_REG
rts
.pend
cast_FAC1_as_w_into_ay .proc ; also used for float 2 b
; -- cast fac1 to word into A/Y
stx P8ZP_SCRATCH_REG
jsr AYINT
ldy floats.AYINT_facmo
lda floats.AYINT_facmo+1
ldx P8ZP_SCRATCH_REG
rts
.pend
copy_float .proc
; -- copies the 5 bytes of the mflt value pointed to by P8ZP_SCRATCH_W1,
; into the 5 bytes pointed to by A/Y. Clobbers A,Y.
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
ldy #0
lda (P8ZP_SCRATCH_W1),y
sta (P8ZP_SCRATCH_W2),y
iny
lda (P8ZP_SCRATCH_W1),y
sta (P8ZP_SCRATCH_W2),y
iny
lda (P8ZP_SCRATCH_W1),y
sta (P8ZP_SCRATCH_W2),y
iny
lda (P8ZP_SCRATCH_W1),y
sta (P8ZP_SCRATCH_W2),y
iny
lda (P8ZP_SCRATCH_W1),y
sta (P8ZP_SCRATCH_W2),y
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
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
var_fac1_less_f .proc
; -- is the float in FAC1 < the variable AY?
stx P8ZP_SCRATCH_REG
jsr FCOMP
ldx P8ZP_SCRATCH_REG
cmp #255
beq +
lda #0
rts
+ lda #1
rts
.pend
var_fac1_lesseq_f .proc
; -- is the float in FAC1 <= the variable AY?
stx P8ZP_SCRATCH_REG
jsr FCOMP
ldx P8ZP_SCRATCH_REG
cmp #0
beq +
cmp #255
beq +
lda #0
rts
+ lda #1
rts
.pend
var_fac1_greater_f .proc
; -- is the float in FAC1 > the variable AY?
stx P8ZP_SCRATCH_REG
jsr FCOMP
ldx P8ZP_SCRATCH_REG
cmp #1
beq +
lda #0
rts
+ lda #1
rts
.pend
var_fac1_greatereq_f .proc
; -- is the float in FAC1 >= the variable AY?
stx P8ZP_SCRATCH_REG
jsr FCOMP
ldx P8ZP_SCRATCH_REG
cmp #0
beq +
cmp #1
beq +
lda #0
rts
+ lda #1
rts
.pend
var_fac1_notequal_f .proc
; -- are the floats numbers in FAC1 and the variable AY *not* identical?
stx P8ZP_SCRATCH_REG
jsr FCOMP
ldx P8ZP_SCRATCH_REG
and #1
rts
.pend
vars_equal_f .proc
; -- are the mflpt5 numbers in P8ZP_SCRATCH_W1 and AY identical?
sta P8ZP_SCRATCH_W2
sty P8ZP_SCRATCH_W2+1
ldy #0
lda (P8ZP_SCRATCH_W1),y
cmp (P8ZP_SCRATCH_W2),y
bne _false
iny
lda (P8ZP_SCRATCH_W1),y
cmp (P8ZP_SCRATCH_W2),y
bne _false
iny
lda (P8ZP_SCRATCH_W1),y
cmp (P8ZP_SCRATCH_W2),y
bne _false
iny
lda (P8ZP_SCRATCH_W1),y
cmp (P8ZP_SCRATCH_W2),y
bne _false
iny
lda (P8ZP_SCRATCH_W1),y
cmp (P8ZP_SCRATCH_W2),y
bne _false
lda #1
rts
_false lda #0
rts
.pend
vars_less_f .proc
; -- is float in AY < float in P8ZP_SCRATCH_W2 ?
jsr MOVFM
lda P8ZP_SCRATCH_W2
ldy P8ZP_SCRATCH_W2+1
stx P8ZP_SCRATCH_REG
jsr FCOMP
ldx P8ZP_SCRATCH_REG
cmp #255
bne +
lda #1
rts
+ lda #0
rts
.pend
vars_lesseq_f .proc
; -- is float in AY <= float in P8ZP_SCRATCH_W2 ?
jsr MOVFM
lda P8ZP_SCRATCH_W2
ldy P8ZP_SCRATCH_W2+1
stx P8ZP_SCRATCH_REG
jsr FCOMP
ldx P8ZP_SCRATCH_REG
cmp #255
bne +
- lda #1
rts
+ cmp #0
beq -
lda #0
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
set_array_float_from_fac1 .proc
; -- set the float in FAC1 in the array (index in A, array in P8ZP_SCRATCH_W1)
sta P8ZP_SCRATCH_B1
asl a
asl a
clc
adc P8ZP_SCRATCH_B1
ldy P8ZP_SCRATCH_W1+1
clc
adc P8ZP_SCRATCH_W1
bcc +
iny
+ stx floats_store_reg
tax
jsr MOVMF
ldx floats_store_reg
rts
.pend
set_0_array_float .proc
; -- set a float in an array to zero (index in A, array in P8ZP_SCRATCH_W1)
sta P8ZP_SCRATCH_B1
asl a
asl a
clc
adc P8ZP_SCRATCH_B1
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 in A, float in P8ZP_SCRATCH_W1, array in P8ZP_SCRATCH_W2)
sta P8ZP_SCRATCH_B1
asl a
asl a
clc
adc P8ZP_SCRATCH_B1
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
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