mirror of
https://github.com/irmen/prog8.git
synced 2024-12-27 05:29:38 +00:00
154 lines
6.5 KiB
Lua
154 lines
6.5 KiB
Lua
; Prog8 definitions for floating point handling on the CommanderX16
|
|
;
|
|
; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
|
|
;
|
|
; indent format: TABS, size=8
|
|
|
|
%option enable_floats
|
|
|
|
c64flt {
|
|
; ---- this block contains C-64 floating point related functions ----
|
|
|
|
const float PI = 3.141592653589793
|
|
const float TWOPI = 6.283185307179586
|
|
const float ZERO = 0.0
|
|
|
|
|
|
; ---- 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 $fe00 = AYINT() clobbers(A,X,Y) ; fac1-> signed word in 100-101 ($64-$65) MSB FIRST. (might throw ILLEGAL QUANTITY)
|
|
|
|
; GIVAYF: signed word in Y/A (note different lsb/msb order) -> float in fac1
|
|
; there is also c64flt.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 $fe03 = GIVAYF(ubyte lo @ Y, ubyte hi @ A) clobbers(A,X,Y)
|
|
|
|
; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY) (result also in $14/15)
|
|
; (tip: use GETADRAY to get A/Y output; lo/hi switched to normal little endian order)
|
|
romsub $fe06 = GETADR() clobbers(X) -> ubyte @ Y, ubyte @ A
|
|
|
|
romsub $fe09 = FADDH() clobbers(A,X,Y) ; fac1 += 0.5, for rounding- call this before INT
|
|
romsub $fe0c = FSUB(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt from A/Y - fac1
|
|
romsub $fe0f = FSUBT() clobbers(A,X,Y) ; fac1 = fac2-fac1 mind the order of the operands
|
|
romsub $fe12 = FADD(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 += mflpt value from A/Y
|
|
romsub $fe15 = FADDT() clobbers(A,X,Y) ; fac1 += fac2
|
|
romsub $fe1b = ZEROFC() clobbers(A,X,Y) ; fac1 = 0
|
|
romsub $fe1e = NORMAL() clobbers(A,X,Y) ; normalize fac1 (?)
|
|
romsub $fe24 = LOG() clobbers(A,X,Y) ; fac1 = LN(fac1) (natural log)
|
|
romsub $fe27 = FMULT(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 *= mflpt value from A/Y
|
|
romsub $fe2a = FMULTT() clobbers(A,X,Y) ; fac1 *= fac2
|
|
romsub $fe33 = CONUPK(uword mflpt @ AY) clobbers(A,Y) ; load mflpt value from memory in A/Y into fac2
|
|
romsub $fe36 = MUL10() clobbers(A,X,Y) ; fac1 *= 10
|
|
romsub $fe3c = DIV10() clobbers(A,X,Y) ; fac1 /= 10 , CAUTION: result is always positive!
|
|
romsub $fe3f = FDIV(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt in A/Y / fac1 (remainder in fac2)
|
|
romsub $fe42 = FDIVT() clobbers(A,X,Y) ; fac1 = fac2/fac1 (remainder in fac2) mind the order of the operands
|
|
|
|
romsub $fe48 = MOVFM(uword mflpt @ AY) clobbers(A,Y) ; load mflpt value from memory in A/Y into fac1
|
|
romsub $fe4b = MOVMF(uword mflpt @ XY) clobbers(A,Y) ; store fac1 to memory X/Y as 5-byte mflpt
|
|
romsub $fe4e = MOVFA() clobbers(A,X) ; copy fac2 to fac1
|
|
romsub $fe51 = MOVAF() clobbers(A,X) ; copy fac1 to fac2 (rounded)
|
|
romsub $fe54 = MOVEF() clobbers(A,X) ; copy fac1 to fac2
|
|
romsub $fe5a = SIGN() -> ubyte @ A ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
|
|
romsub $fe5d = SGN() clobbers(A,X,Y) ; fac1 = SGN(fac1), result of SIGN (-1, 0 or 1)
|
|
romsub $fe60 = FREADSA(byte value @ A) clobbers(A,X,Y) ; 8 bit signed A -> float in fac1
|
|
romsub $fe6c = ABS() ; fac1 = ABS(fac1)
|
|
romsub $fe6f = 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 $fe78 = INT() clobbers(A,X,Y) ; INT() truncates, use FADDH first to round instead of trunc
|
|
romsub $fe7e = FINLOG(byte value @A) clobbers (A, X, Y) ; fac1 += signed byte in A
|
|
romsub $fe81 = FOUT() clobbers(X) -> uword @ AY ; fac1 -> string, address returned in AY
|
|
romsub $fe8a = SQR() clobbers(A,X,Y) ; fac1 = SQRT(fac1)
|
|
romsub $fe8d = FPWRT() clobbers(A,X,Y) ; fac1 = fac2 ** fac1
|
|
romsub $fe93 = NEGOP() clobbers(A) ; switch the sign of fac1
|
|
romsub $fe96 = EXP() clobbers(A,X,Y) ; fac1 = EXP(fac1) (e ** fac1)
|
|
romsub $fe9f = RND2(byte value @A) clobbers(A,X,Y) ; fac1 = RND(A) float random number generator
|
|
romsub $fea2 = RND() clobbers(A,X,Y) ; fac1 = RND(fac1) float random number generator
|
|
romsub $fea5 = COS() clobbers(A,X,Y) ; fac1 = COS(fac1)
|
|
romsub $fea8 = SIN() clobbers(A,X,Y) ; fac1 = SIN(fac1)
|
|
romsub $feab = TAN() clobbers(A,X,Y) ; fac1 = TAN(fac1)
|
|
romsub $feae = ATN() clobbers(A,X,Y) ; fac1 = ATN(fac1)
|
|
|
|
|
|
asmsub GIVUAYFAY (uword value @ AY) clobbers(A,X,Y) {
|
|
; ---- unsigned 16 bit word in A/Y (lo/hi) to fac1
|
|
%asm {{
|
|
phx
|
|
sta P8ZP_SCRATCH_REG
|
|
sty P8ZP_SCRATCH_B1
|
|
tya
|
|
ldy P8ZP_SCRATCH_REG
|
|
jsr GIVAYF ; load it as signed... correct afterwards
|
|
lda P8ZP_SCRATCH_B1
|
|
bpl +
|
|
lda #<_flt65536
|
|
ldy #>_flt65536
|
|
jsr FADD
|
|
+ plx
|
|
rts
|
|
_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_REG
|
|
tya
|
|
ldy P8ZP_SCRATCH_REG
|
|
jmp GIVAYF ; this uses the inverse order, Y/A
|
|
}}
|
|
}
|
|
|
|
asmsub FTOSWRDAY () clobbers(X) -> uword @ AY {
|
|
; ---- fac1 to signed word in A/Y
|
|
%asm {{
|
|
jsr FTOSWORDYA ; note the inverse Y/A order
|
|
sta P8ZP_SCRATCH_REG
|
|
tya
|
|
ldy P8ZP_SCRATCH_REG
|
|
rts
|
|
}}
|
|
}
|
|
|
|
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
|
|
}}
|
|
}
|
|
|
|
sub print_f (float value) {
|
|
; ---- prints the floating point value (without a newline).
|
|
%asm {{
|
|
stx P8ZP_SCRATCH_REG_X
|
|
lda #<value
|
|
ldy #>value
|
|
jsr MOVFM ; load float into fac1
|
|
jsr FOUT ; fac1 to string in A/Y
|
|
sta P8ZP_SCRATCH_B1
|
|
sty P8ZP_SCRATCH_REG
|
|
ldy #0
|
|
- lda (P8ZP_SCRATCH_B1),y
|
|
beq +
|
|
jsr c64.CHROUT
|
|
iny
|
|
bne -
|
|
ldx P8ZP_SCRATCH_REG_X
|
|
+ rts
|
|
}}
|
|
}
|
|
|
|
%asminclude "library:c64floats.asm", ""
|
|
|
|
}
|