Motorola DSP96002 - Manual (Page 774)

D-22 DSP96002 USER’S MANUAL MOTOROLA
D.1.5.1.2.7 Data ALU Results/Move Compatibility Summary
Figure C-3 summarizes what happens when Data ALU operation results of a certain range is stored in the
destination register, and the register is read by a certain kind of move.
All cases where "move out type"=SP and "move out result"=WRONG can be corrected by rounding in the
instruction (using the .S option). The case where "move out type"=SP and "move out result"=TRUNC can
also be corrected by using the .S option.
ROUND EXPONENT RANGE DATA ALU OPERATION TAGS MOVE MOVE OUT
TO BEFORE ROUND RESULT OUT RESULT
(UNBIASED) U V TYPE
SP NaN operand or non signaling NaN (QNAN) 0 0 SP CORRECT
invalid op written as DP QNAN
e=7FF mantissa=1.11...11 DP CORRECT
SP 127<e infinity (overflow) 0 0 SP CORRECT
written as DP infinity
e=7FF mantissa=1.00...00 DP CORRECT
SP 127<e< 128 normalized (all formats) 0 0 SP CORRECT
DP CORRECT
SP -150
<
e
< −
126 denormalized (in SP) 1 0 SP CORRECT
DP WRONG
SP e
< −
149 zero (underflow) 0 0 SP CORRECT
DP CORRECT
SEP NaN operand or non signaling NaN (QNAN) 0 0 SP CORRECT
invalid op written as DP QNAN
e=7FF mantissa=1.11...11 DP CORRECT
SEP 1023<e infinity in SP and SEP 0 0 SP CORRECT
written as DP infinity
e=7FF mantissa=1.00...00 DP CORRECT
SEP 127<e< 1024 infinity in SP 0 0 SP WRONG
normalized in SEP
DP CORRECT
SEP -127<e< 128 normalized (all formats) 0 0 SP TRUNC
DP CORRECT
Figure C -3. Data ALU Results/Move Compatibility Summary (Continued)