Motorola DSP96002 - Manual (Page 691)

B-172 DSP96002 USER’S MANUAL MOTOROLA
; tmp1 = register name of the form "Dn", and is a temporary var which
; uses the lowest 32 bits of the register (Dn.L is destroyed)
; tmp2 = register name of the form "Dn", and is a temporary var which
; uses the lowest 32 bits of the register (Dn.L is destroyed)
;
; Note that op, tmp1, and tmp2 must all be different registers.
andi #$c3,ccr ;
jclr #31,op.h,_chkrst ;
ori #$8,ccr ;
_chkrst move op.h,tmp1.l ;
move #EXP_MSK,tmp2.l ;
and tmp2,tmp1 ;
tst op ;
jneq _chknan ;
tst tmp1 op.m,tmp2.l ;
jneq _maxexp ;
tst tmp2 ;
jneq _chknan ;
ori #$4,ccr ;
jmp _done ;
_maxexp move #MAX,tmp2.l ;
cmp tmp1,tmp2 op.m,tmp1.l ;
jne _done ;
bclr #31,tmp1.l ;
tst tmp1 ;
jneq _nan ;
andi #$b,ccr ;
ori #$10,ccr ;
jmp _done ;
_chknan move #MAX,tmp2.l ;
cmp tmp1,tmp2 ;
jne _done ;
_nan andi #$b,ccr ;
ori #$20,ccr ;
jset #30,op.m,_done ;
ori #$20,er ;
_done
endm
; ****** Reset Processor Flags ******
movec sr,d0.l ;
move #SR_MASK,d1.l ;
and d1,d0 ;
movec d0.l,sr ;