prog8/compiler/res/prog8lib/cx16/floats.p8

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; 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
2020-09-09 20:49:32 +00:00
%target cx16
%option enable_floats
floats {
; ---- this block contains C-64 floating point related functions ----
const float PI = 3.141592653589793
const float TWOPI = 6.283185307179586
; ---- 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 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 $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 {{
phx
lda #<value
ldy #>value
jsr MOVFM ; load float into fac1
jsr FOUT ; fac1 to string in A/Y
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sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
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- lda (P8ZP_SCRATCH_W1),y
beq +
jsr c64.CHROUT
iny
bne -
+ plx
rts
}}
}
%asminclude "library:c64/floats.asm", ""
}