A2osX/SYS/KERNEL.S.MATH.txt

PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
*/--------------------------------------
* # FAdd,FSub,FMult,FDiv,FPwr
* Return X+Y, X-Y, X*Y, X/Y, X^Y
* ## In:
*  PUSHW = X (*Float)
*  PUSHW = Y (*Float)
*  Y,A = Dest (*Float)
*\--------------------------------------
K.FAdd			ldx #ROM.FADD
				.HS 2C					BIT ABS
K.FSub			ldx #ROM.FSUB
				.HS 2C					BIT ABS
K.FMult			ldx #ROM.FMULT
				.HS 2C					BIT ABS
K.FDiv			ldx #ROM.FDIV
				.HS 2C					BIT ABS
K.FPwr			ldx #ROM.PWR
				>STYA FORPNT
				phx
				jsr MATH.PullFAC
				jsr MATH.PullARG
				bra MATH.Go
*/--------------------------------------
* # Log,Sqr,Exp,Cos,Sin,Tan,ATan
* Return Log(x), Sqr(x), E^X, Cos(x), Sin(X), Tan(x), ATan(x)
* ## In:
*  PUSHW = X (*Float)
*  Y,A = Dest (*Float)
*\--------------------------------------
K.Log			ldx #ROM.LOG
				.HS 2C					BIT ABS
K.Sqr			ldx #ROM.SQR
				.HS 2C					BIT ABS
K.Exp			ldx #ROM.EXP
				.HS 2C					BIT ABS
K.Cos			ldx #ROM.COS
				.HS 2C					BIT ABS
K.Sin			ldx #ROM.SIN
				.HS 2C					BIT ABS
K.Tan			ldx #ROM.TAN
				.HS 2C					BIT ABS
K.ATan			ldx #ROM.ATAN
				>STYA FORPNT
				phx
				jsr MATH.PullFAC
				bra MATH.Go			
*/--------------------------------------
* # Float
* Return return 'floated' long
* ## In:
*  PUSHW = X (*long)
*  Y,A = Dest (*float)
*\--------------------------------------
K.Float			>STYA FORPNT
				>PULLW INDEX
				
				ldx #1
				ldy #3
				
.1				lda (INDEX),y
				sta FAC,x
				inx
				dey
				bpl .1	
				stz	FAC.SIGN
				lda #$A0
				sta FAC					Exp=32
				
				ldx #ROM.LTOF
				phx

MATH.Go			plx
				lda SIGNFLG				pPs !!!!
				pha
				jsr A2osX.ROMCALL
				>ROMCALL GETFAC
				pla
				sta SIGNFLG
				clc
				rts
*/--------------------------------------
* # LRIntF
* Return Float rounded into a long
* ## In:
*  PUSHW = X (*Float)
*  Y,A = Dest (*long)
*\--------------------------------------
K.LRIntF		>STYA FORPNT
				jsr MATH.PullFAC
				ldx #ROM.QINT
				jsr A2osX.ROMCALL	

				ldx #1
				ldy #3
				
.1				lda FAC,x
				sta (FORPNT),y
				inx
				dey
				bpl .1
				
				clc
				rts				
*--------------------------------------
MATH.PullFAC	>PULLW INDEX
				>ROMCALL SETFAC
				rts
*--------------------------------------
MATH.PullARG	>PULLW INDEX
				>ROMCALL SETARG
				rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.MATH
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM