Motorola DSP96002 - Manual (Page 695)

B-176 DSP96002 USER’S MANUAL MOTOROLA
; d5.l = next most significant word,
; d3.l = next most significant word,
; and least significant word info
; is in the sticky bit.
;
; Upper 96 bits = d4.l:d5.l:d3.l, and
; the lowest 32 bits have been ORed
; into the sticky bit.
; ****** Continue Calculating Sticky Bit ******
move #SMSK,d0.l ;
move d5.l,d2.l ;
and d0,d2 ;
tst d2 ;
jeq _stlow ;
move #1,d1.h ;
_stlow tst d3 ;
jeq _post ;
move #1,d1.h ;
; ****** Post Normalization ******
_post jset #31,d4.l,_undr ;
_ptop asl d3 ;
rol d5 ;
rol d4 d0.m,d0.l ;
move d0.m,d0.l ;
dec d0 ;
move d0.l,d0.m ;
jclr #31,d4.l,_ptop ;
; ****** Underflow Check ******
_undr
move d0.m,d0.l ;
move #EMIN,d1.l ;
sub d1,d0 ;
jpl _rnd ;
jset #27,sr,_ret0 ;
;
move #-52,d1.l ;
cmp d1,d0 ;
jmi _rnd0 ;