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164 lines
6.7 KiB
Lua
164 lines
6.7 KiB
Lua
; Prog8 definitions for floating point handling on the Commodore 128
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;
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; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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%option enable_floats
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floats {
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; ---- this block contains C-128 compatible floating point related functions ----
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const float PI = 3.141592653589793
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const float TWOPI = 6.283185307179586
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float tempvar_swap_float ; used for some swap() operations
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; ---- ROM float functions ----
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; TODO c128 fix float routine addresses
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; note: the fac1 and fac2 are working registers and take 6 bytes each,
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; floats in memory (and rom) are stored in 5-byte MFLPT packed format.
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; note: fac1/2 might get clobbered even if not mentioned in the function's name.
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; note: for subtraction and division, the left operand is in fac2, the right operand in fac1.
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romsub $fe00 = AYINT() clobbers(A,X,Y) ; fac1-> signed word in 100-101 ($64-$65) MSB FIRST. (might throw ILLEGAL QUANTITY)
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; GIVAYF: signed word in Y/A (note different lsb/msb order) -> float in fac1
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; there is also floats.GIVUAYFAY - unsigned word in A/Y (lo/hi) to fac1
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; (tip: use GIVAYFAY to use A/Y input; lo/hi switched to normal order)
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romsub $fe03 = GIVAYF(ubyte lo @ Y, ubyte hi @ A) clobbers(A,X,Y)
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; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY) (result also in $14/15)
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; (tip: use GETADRAY to get A/Y output; lo/hi switched to normal little endian order)
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romsub $fe06 = GETADR() clobbers(X) -> ubyte @ Y, ubyte @ A
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romsub $fe09 = FADDH() clobbers(A,X,Y) ; fac1 += 0.5, for rounding- call this before INT
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romsub $fe0c = FSUB(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt from A/Y - fac1
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romsub $fe0f = FSUBT() clobbers(A,X,Y) ; fac1 = fac2-fac1 mind the order of the operands
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romsub $fe12 = FADD(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 += mflpt value from A/Y
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romsub $fe15 = FADDT() clobbers(A,X,Y) ; fac1 += fac2
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romsub $fe1b = ZEROFC() clobbers(A,X,Y) ; fac1 = 0
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romsub $fe1e = NORMAL() clobbers(A,X,Y) ; normalize fac1 (?)
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romsub $fe24 = LOG() clobbers(A,X,Y) ; fac1 = LN(fac1) (natural log)
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romsub $fe27 = FMULT(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 *= mflpt value from A/Y
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romsub $fe2a = FMULTT() clobbers(A,X,Y) ; fac1 *= fac2
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romsub $fe30 = CONUPK(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac2
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romsub $fe33 = MUL10() clobbers(A,X,Y) ; fac1 *= 10
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romsub $fe36 = DIV10() clobbers(A,X,Y) ; fac1 /= 10 , CAUTION: result is always positive!
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romsub $fe39 = FDIV(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt in A/Y / fac1 (remainder in fac2)
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romsub $fe3c = FDIVT() clobbers(A,X,Y) ; fac1 = fac2/fac1 (remainder in fac2) mind the order of the operands
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romsub $fe42 = MOVFM(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac1
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romsub $fe45 = MOVMF(uword mflpt @ XY) clobbers(A,X,Y) ; store fac1 to memory X/Y as 5-byte mflpt
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romsub $fe48 = MOVFA() clobbers(A,X) ; copy fac2 to fac1
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romsub $fe4b = MOVAF() clobbers(A,X) ; copy fac1 to fac2 (rounded)
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romsub $fe4e = MOVEF() clobbers(A,X) ; copy fac1 to fac2
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romsub $fe54 = SIGN() clobbers(X,Y) -> ubyte @ A ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
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romsub $fe57 = SGN() clobbers(A,X,Y) ; fac1 = SGN(fac1), result of SIGN (-1, 0 or 1)
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romsub $fe5a = FREADSA(byte value @ A) clobbers(A,X,Y) ; 8 bit signed A -> float in fac1
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romsub $fe66 = ABS() clobbers(A,X,Y) ; fac1 = ABS(fac1)
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romsub $fe69 = 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
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romsub $fe72 = INT() clobbers(A,X,Y) ; INT() truncates, use FADDH first to round instead of trunc
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romsub $fe78 = FINLOG(byte value @A) clobbers (A, X, Y) ; fac1 += signed byte in A
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romsub $fe7b = FOUT() clobbers(X) -> uword @ AY ; fac1 -> string, address returned in AY
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romsub $fe81 = SQR() clobbers(A,X,Y) ; fac1 = SQRT(fac1)
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romsub $fe84 = FPWRT() clobbers(A,X,Y) ; fac1 = fac2 ** fac1
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romsub $fe8a = NEGOP() clobbers(A) ; switch the sign of fac1 (fac1 = -fac1)
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romsub $fe8d = EXP() clobbers(A,X,Y) ; fac1 = EXP(fac1) (e ** fac1)
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romsub $fe96 = RND() clobbers(A,X,Y) ; fac1 = RND(fac1) float random number generator
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romsub $fe99 = COS() clobbers(A,X,Y) ; fac1 = COS(fac1)
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romsub $fe9c = SIN() clobbers(A,X,Y) ; fac1 = SIN(fac1)
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romsub $fe9f = TAN() clobbers(A,X,Y) ; fac1 = TAN(fac1)
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romsub $fea2 = ATN() clobbers(A,X,Y) ; fac1 = ATN(fac1)
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asmsub GIVUAYFAY (uword value @ AY) clobbers(A,X,Y) {
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; ---- unsigned 16 bit word in A/Y (lo/hi) to fac1
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%asm {{
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stx P8ZP_SCRATCH_REG
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sta _tmp
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sty P8ZP_SCRATCH_B1
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tya
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ldy _tmp
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jsr GIVAYF ; load it as signed... correct afterwards
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lda P8ZP_SCRATCH_B1
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bpl +
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lda #<_flt65536
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ldy #>_flt65536
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jsr FADD
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+ ldx P8ZP_SCRATCH_REG
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rts
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_tmp .byte 0
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_flt65536 .byte 145,0,0,0,0 ; 65536.0
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}}
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}
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asmsub GIVAYFAY (uword value @ AY) clobbers(A,X,Y) {
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; ---- signed 16 bit word in A/Y (lo/hi) to float in fac1
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%asm {{
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sta P8ZP_SCRATCH_B1
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tya
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ldy P8ZP_SCRATCH_B1
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jmp GIVAYF ; this uses the inverse order, Y/A
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}}
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}
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asmsub FTOSWRDAY () clobbers(X) -> uword @ AY {
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; ---- fac1 to signed word in A/Y
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%asm {{
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jsr FTOSWORDYA ; note the inverse Y/A order
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sta P8ZP_SCRATCH_B1
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tya
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ldy P8ZP_SCRATCH_B1
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rts
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}}
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}
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asmsub GETADRAY () clobbers(X) -> uword @ AY {
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; ---- fac1 to unsigned word in A/Y
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%asm {{
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jsr GETADR ; this uses the inverse order, Y/A
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sta P8ZP_SCRATCH_B1
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tya
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ldy P8ZP_SCRATCH_B1
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rts
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}}
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}
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asmsub FREADUY (ubyte value @Y) {
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; -- 8 bit unsigned Y -> float in fac1
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%asm {{
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lda #0
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jmp GIVAYF
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}}
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}
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sub print_f (float value) {
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; ---- prints the floating point value (without a newline).
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%asm {{
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stx P8ZP_SCRATCH_REG
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lda #<value
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ldy #>value
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jsr MOVFM ; load float into fac1
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jsr FOUT ; fac1 to string in A/Y
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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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beq +
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jsr c64.CHROUT
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iny
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bne -
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+ ldx P8ZP_SCRATCH_REG
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rts
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}}
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}
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%asminclude "library:c64/floats.asm"
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%asminclude "library:c64/floats_funcs.asm"
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}
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