1 
 2 02/28/80  exponent_control_
 3 
 4 Function: Controls the system's action in the event of computational
 5 overflows and underflows.
 6 
 7 
 8 Notes for exponent_control_: By default the system signals a fault
 9 condition on computational overflows and underflows.  If this routine
10 is used to to restart overflows, the default is to supply a result of
11 the largest possible positive number for positive overflows and its
12 negative for negative overflows.
13 
14 
15 Entry points in exponent_control_:
16 
17 
18 :Entry:restart_overflow:  02/28/80  exponent_control_$restart_overflow
19 
20 Syntax:
21 call exponent_control_$restart_overflow (code);
22 dcl exponent_control_$restart_overflow entry (fixed bin (35));
23 
24 
25 Notes: This entrypoint instructs the system to restart overflowing
26 computations.  The value returned by the overflowing computations
27 will be the largest representable number for positive overflows, and
28 the negative of that number for negative overflows.
29 
30 
31 :Entry:restart_underflow:  02/28/80  exponent_control_$restart_underflow
32 
33 Syntax:
34 call exponent_control_$restart_underflow (code);
35 dcl exponent_control_$restart_underflow entry (fixed bin (35));
36 
37 
38 Notes: This entrypoint instructs the system to restart underflowing
39 computations.  Zero is returned for the result.
40 
41 
42 :Entry:restart_overflow_value:  02/28/80  exponent_control_$restart_overflow_value
43 
44 Syntax:
45 call exponent_control_$restart_overflow_value (amax_value, code);
46 dcl exponent_control_$restart_overflow_value entry (float bin (63),
47     fixed bin (35));
48 
49 
50 Notes: This entrypoint is identical to restart_overflow except that
51 overflowing computations are restarted with the specified values.
52 The negative of the value is is used for overflows in a negative
53 direction.
54 
55 
56 :Entry:fault_underflow:  02/28/80  exponent_control_$fault_underflow
57 
58 Syntax:
59 call exponent_control_$fault_underflow (code);
60 dcl exponent_control_$fault_underflow entry (fixed bin (35));
61 
62 
63 Notes:  This entrypoint instructs the system to signal fault conditions for
64 computational underflows.
65 
66 
67 :Entry:fault_overflow:  02/28/80  exponent_control_$fault_overflow
68 
69 Syntax:
70 call exponent_control_$fault_overflow (code);
71 dcl exponent_control_$fault_overflow entry (fixed bin (35));
72 
73 
74 Notes: This entrypoint instructs the system to signal fault
75 conditions for computational overflows.
76 
77 
78