Motorola DSP96002 - Manual (Page 620)

MOTOROLA DSP96002 USER’S MANUAL B-101
;---------------------------------------------------------
;
; Single point clipping routines
;
;---------------------------------------------------------
; x = w boundary
_clip1_xp
move y:(r1)-,d4.s ;W1 1 1
fmpy.s d2,d4,d3 x:(r1)+,d0.s d2.s,d7.s ;X1 1 1
fsub.s d0,d4 x:(r1)-,d0.s ;Y1 1 1
fmpy.s d1,d4,d1 ; 1 1
fmpy d4,d5,d2 fsub.s d3,d1 d0.s,d5.s ; 1 1
fmpy.s d5,d7,d3 ; 1 1
fmpy d4,d6,d3 fsub.s d3,d2 y:(r1)+,d4.s ;Z1 1 1
fmpy.s d4,d7,d2 d2.s,d5.s ; 1 1
fsub.s d2,d3 d1.s,d0.s ; 1 1
move d3.s,d6.s ; 1 1
rts ; 2 2
; x = -w boundary
_clip1_xn
move y:(r1)-,d4.s ;W1 1 1
fmpy.s d1,d4,d3 x:(r1)+,d0.s d1.s,d7.s ;X1 1 1
fadd.s d0,d4 x:(r1)-,d0.s ;Y1 1 1
fmpy.s d2,d4,d2 ; 1 1
fmpy d4,d5,d1 fsub.s d3,d2 d0.s,d5.s ; 1 1
fmpy.s d5,d7,d3 ; 1 1
fmpy d4,d6,d3 fsub.s d3,d1 y:(r1)+,d4.s ;Z1 1 1
fmpy.s d4,d7,d1 d1.s,d5.s ; 1 1
fsub.s d1,d3 d2.s,d0.s ; 1 1
fneg.s d0 d3.s,d6.s ; 1 1
rts ; 2 2