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9- 24 M68040 USER’S MANUAL MOTOROLA
DENORMALIZED SINGLE PRECISION
31 30 23 22 0
0394062636479809495
$0S
$0 $0 $00
FORMAT IN STATE FRAME
MANTISSAEXPS
FRACTION
DENORMALIZED DOUBLE PRECISION
63 62 52 51 0
0101162636479809495
$0S
$0 $0 $0
0
FORMAT IN STATE FRAME
MANTISSAEXPS
MANTISSA
(a) Single Precision
(b) Double Precision
Figure 9-9. Format of Denormalized Operand in State Frame
9.7 FLOATING-POINT ARITHMETIC EXCEPTIONS
The following eight user floating-point arithmetic exceptions are listed in order of priority.
The MC68040 generates the first seven exceptions in hardware and the eighth only in
software.
Branch/Set on Unordered (BSUN)
Signaling Not-A-Number (SNAN)
Operand Error (OPERR)
Overflow (OVFL)
Underflow (UNFL)
Divide by Zero (DZ)
Inexact 2 (INEX2)
Inexact 1 (INEX1)
INEX1 exception is the condition that exists when a packed decimal operand cannot be
converted exactly to the extended-precision format in the current rounding mode. Since
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