Freescale Semiconductor MC68881 - Page 338

8
Table 8-14. Arithmetic Calculation Times -- Dyadic Operations (Continued)
FSCALE Calculation Time:
Source
Destination
~
+
Normalized
Normalized
+
Zero
+
Infinity
+
NAN
SCALE 6+ 20 NAN2
+
Zero 6 6 20 NAN2
+
Infinity 6 6 20 NAN2
+
NAN NAN1 NAN2 NAN2 NAN3
SCALE:
12+ if the
source exponent (unbiased) is less than zero.
16+ if the source exponent (unbiased) is in the range [0..
20 + if the source exponent (unbiased) is greater than 15.
15}.
FSGLDIV Calculation Time:
Source
Destination
~
+
Normalized
Normalized
+
NAN
+
_ SGLDIV NAN2
+
Zero 6 8 NAN2
+
Infinity 6 8 RAN2
+
NAN NAN1 NAN3
Zero Infinity
+ - + -
6 8
2O
8 6
20 6 8
6 8 20
NAN2 NAN2
44 if no extendedpreclsion underflow or overflow occurs.
62 if an extended precision overflow occurs.
90 if an extended precision underflow occurs.
SGLDIV:
FSGLMUL Calculation Time:
Source
Destination
~
+
Normalized
Normalized
+
Zero
-I-
Infinity
6 6
8 8
6 8 20
20 6 8
NAN2 NAN2
NAN
+
SGLMUL NAN2
+
Zero 6 B NAN2
+
Infinity 6 8 NAN2
+
NAN NAN1 NAN3
SGLMUL: 34 if no extended precision unde~ow or overflow occurs.
52 if an extended precision overflow occurs.
80 if an extended precision underflow occurs.
FREESCALE
8-32
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