Freescale Semiconductor MC68881 - Page 337

Table 8-14. Arithmetic Calculation Times B Dyadic Operations (Continued)
FMOD Calculation Time:
Source
Destination
Normalized
.}.
Zero
+
Infinity
+
NAN
+
Normalized MOD 20 6 + NAN2
+
Zero 6 + 20 6 + NAN2
+
Infinity lOP 20 20 NAN2
NAN +
NANI NAN2 NAN2 NAN3
MOD: 18+ if the quotient is zero; else:
(40+70 ( INT ( 1+destination exponent-source exponent )})+
( ( ( )))
FMUL Calculation Time:
e
+
Normalized
+
Zero
+
Infinity
+
NAN
Normalized
+
MUL
Zero
+
Infinity
+
NAN
NAN2
6 8 6 8 20 NAN2
6 8 20 6 8 NAN2
NAN 1 NAN2 NAN2 NAN3
MUL:
46+ if the intermediate result is normalized,
48+ if the intermediate result is not normalized.
FREM Calculation Time:
Source
Destination
~-~......
+
Normalized
+
Zero
+
Infinity
+
NAN
Normalized
+
Zero
REM
infinity NAN
+ - + -
6+ NAN2
6+ NAN2
20 NAN2
NAN2 NAN3
20
6+ 20
lOP 20
NAN1 NAN2
REM:
18+ if the quotient is zero; else:
{40+70 ( INT ( 1+destination exponent-source exponent )))+
( ( ( 64 ))}
MC68881/MC68882 USER'S MANUAL FREESCALE
8-31