mirror of
https://github.com/irmen/prog8.git
synced 2024-11-23 22:33:12 +00:00
160 lines
6.5 KiB
Lua
160 lines
6.5 KiB
Lua
; Prog8 definitions for floating point handling on the Commodore 128
|
|
;
|
|
; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
|
|
|
|
%option enable_floats
|
|
|
|
floats {
|
|
; ---- this block contains C-128 compatible floating point related functions ----
|
|
|
|
const float PI = 3.141592653589793
|
|
const float TWOPI = 6.283185307179586
|
|
|
|
float tempvar_swap_float ; used for some swap() operations
|
|
|
|
|
|
; ---- ROM float functions ----
|
|
|
|
; note: the fac1 and fac2 are working registers and take 6 bytes each,
|
|
; floats in memory (and rom) are stored in 5-byte MFLPT packed format.
|
|
|
|
; note: fac1/2 might get clobbered even if not mentioned in the function's name.
|
|
; note: for subtraction and division, the left operand is in fac2, the right operand in fac1.
|
|
|
|
romsub $af00 = AYINT() clobbers(A,X,Y) ; fac1-> signed word in 102-103 ($66-$67) MSB FIRST. (might throw ILLEGAL QUANTITY)
|
|
|
|
; GIVAYF: signed word in Y/A (note different lsb/msb order) -> float in fac1
|
|
; there is also floats.GIVUAYFAY - unsigned word in A/Y (lo/hi) to fac1
|
|
; (tip: use GIVAYFAY to use A/Y input; lo/hi switched to normal order)
|
|
romsub $af03 = GIVAYF(ubyte lo @ Y, ubyte hi @ A) clobbers(A,X,Y)
|
|
romsub $af09 = VAL(ubyte length @ A) clobbers(A,X,Y) ; str -> fac1, $24/25 must point to string in bank1, A=string length Don't call this from bank0
|
|
|
|
; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY) (result also in $16/17)
|
|
; (tip: use GETADRAY to get A/Y output; lo/hi switched to normal little endian order)
|
|
romsub $af0c = GETADR() clobbers(X) -> ubyte @ Y, ubyte @ A
|
|
|
|
romsub $af12 = FSUB(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt from A/Y - fac1
|
|
romsub $af15 = FSUBT() clobbers(A,X,Y) ; fac1 = fac2-fac1 mind the order of the operands
|
|
romsub $af18 = FADD(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 += mflpt value from A/Y in bank 1
|
|
romsub $af1b = FADDT() clobbers(A,X,Y) ; fac1 += fac2
|
|
romsub $af2a = LOG() clobbers(A,X,Y) ; fac1 = LN(fac1) (natural log)
|
|
romsub $af1e = FMULT(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 *= mflpt value from A/Y
|
|
romsub $af21 = FMULTT() clobbers(A,X,Y) ; fac1 *= fac2
|
|
romsub $af5a = CONUPK(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory bank 1 in A/Y into fac2
|
|
romsub $af5d = ROMUPK(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in current bank in A/Y into fac2
|
|
romsub $af24 = FDIV(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt in A/Y / fac1 (remainder in fac2)
|
|
romsub $af27 = FDIVT() clobbers(A,X,Y) ; fac1 = fac2/fac1 (remainder in fac2) mind the order of the operands
|
|
|
|
romsub $af63 = MOVFM(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac1
|
|
romsub $af60 = MOVFRM() clobbers(A,X,Y) ; load mflpt value from memory in $24/$25 into fac2
|
|
romsub $af66 = MOVMF(uword mflpt @ XY) clobbers(A,X,Y) ; store fac1 to memory X/Y as 5-byte mflpt
|
|
romsub $af69 = MOVFA() clobbers(A,X) ; copy fac2 to fac1
|
|
romsub $af6c = MOVAF() clobbers(A,X) ; copy fac1 to fac2
|
|
romsub $af6c = MOVEF() clobbers(A,X) ; copy fac1 to fac2
|
|
romsub $af51 = SIGN() clobbers(X,Y) -> ubyte @ A ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
|
|
romsub $af4e = ABS() clobbers(A,X,Y) ; fac1 = ABS(fac1)
|
|
romsub $af54 = FCOMP(uword mflpt @ AY) clobbers(X,Y) -> ubyte @ A ; A = compare fac1 to mflpt in A/Y, 0=equal 1=fac1 is greater, 255=fac1 is less than
|
|
romsub $af2d = INT() clobbers(A,X,Y) ; INT() truncates, use FADDH first to round instead of trunc
|
|
romsub $af06 = FOUT() clobbers(X) -> uword @ AY ; fac1 -> string, address returned in AY ($0100)
|
|
romsub $af30 = SQR() clobbers(A,X,Y) ; fac1 = SQRT(fac1)
|
|
romsub $af36 = FPWR(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = fac2 ** mflpt from A/Y
|
|
romsub $af39 = FPWRT() clobbers(A,X,Y) ; fac1 = fac2 ** fac1
|
|
romsub $af33 = NEGOP() clobbers(A) ; switch the sign of fac1 (fac1 = -fac1)
|
|
romsub $af3c = EXP() clobbers(A,X,Y) ; fac1 = EXP(fac1) (e ** fac1)
|
|
romsub $af57 = RND() clobbers(A,X,Y) ; fac1 = RND(fac1) float random number generator
|
|
romsub $af3f = COS() clobbers(A,X,Y) ; fac1 = COS(fac1)
|
|
romsub $af42 = SIN() clobbers(A,X,Y) ; fac1 = SIN(fac1)
|
|
romsub $af45 = TAN() clobbers(A,X,Y) ; fac1 = TAN(fac1)
|
|
romsub $af48 = ATN() clobbers(A,X,Y) ; fac1 = ATN(fac1)
|
|
|
|
|
|
asmsub FREADSA (byte value @A) clobbers(A,X,Y) {
|
|
; ---- 8 bit signed A -> float in fac1
|
|
%asm {{
|
|
tay
|
|
bpl +
|
|
lda #$ff
|
|
jmp GIVAYF
|
|
+ lda #0
|
|
jmp GIVAYF
|
|
}}
|
|
}
|
|
|
|
asmsub GIVUAYFAY (uword value @ AY) clobbers(A,X,Y) {
|
|
; ---- unsigned 16 bit word in A/Y (lo/hi) to fac1
|
|
%asm {{
|
|
stx P8ZP_SCRATCH_REG
|
|
sta _tmp
|
|
sty P8ZP_SCRATCH_B1
|
|
tya
|
|
ldy _tmp
|
|
jsr GIVAYF ; load it as signed... correct afterwards
|
|
lda P8ZP_SCRATCH_B1
|
|
bpl +
|
|
lda #<_flt65536
|
|
ldy #>_flt65536
|
|
jsr ROMUPK
|
|
jsr FADDT
|
|
+ ldx P8ZP_SCRATCH_REG
|
|
rts
|
|
_tmp .byte 0
|
|
_flt65536 .byte 145,0,0,0,0 ; 65536.0
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub GIVAYFAY (uword value @ AY) clobbers(A,X,Y) {
|
|
; ---- signed 16 bit word in A/Y (lo/hi) to float in fac1
|
|
%asm {{
|
|
sta P8ZP_SCRATCH_B1
|
|
tya
|
|
ldy P8ZP_SCRATCH_B1
|
|
jmp GIVAYF ; this uses the inverse order, Y/A
|
|
}}
|
|
}
|
|
|
|
asmsub GETADRAY () clobbers(X) -> uword @ AY {
|
|
; ---- fac1 to unsigned word in A/Y
|
|
%asm {{
|
|
jsr GETADR ; this uses the inverse order, Y/A
|
|
sta P8ZP_SCRATCH_B1
|
|
tya
|
|
ldy P8ZP_SCRATCH_B1
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub FREADUY (ubyte value @Y) {
|
|
; -- 8 bit unsigned Y -> float in fac1
|
|
%asm {{
|
|
lda #0
|
|
jmp GIVAYF
|
|
}}
|
|
}
|
|
|
|
sub print_f (float value) {
|
|
; ---- prints the floating point value (without a newline).
|
|
%asm {{
|
|
stx P8ZP_SCRATCH_REG
|
|
lda #<value
|
|
ldy #>value
|
|
jsr MOVFM ; load float into fac1
|
|
jsr FOUT ; fac1 to string in A/Y
|
|
sta P8ZP_SCRATCH_W1
|
|
sty P8ZP_SCRATCH_W1+1
|
|
ldy #0
|
|
- lda (P8ZP_SCRATCH_W1),y
|
|
beq +
|
|
jsr c64.CHROUT
|
|
iny
|
|
bne -
|
|
+ ldx P8ZP_SCRATCH_REG
|
|
rts
|
|
}}
|
|
}
|
|
|
|
%asminclude "library:c128/floats.asm"
|
|
%asminclude "library:c64/floats_funcs.asm"
|
|
|
|
}
|