Fine-grained management of exception enablement of floating point controls
View Patent ↗Setting or updating of floating point controls is managed. Floating point controls include controls used for floating point operations, such as rounding mode and/or other controls. Further, floating point controls include status associated with floating point operations, such as floating point exceptions and/or others. The management of the floating point controls includes efficiently updating the controls, while reducing costs associated therewith.
1. A computer-implemented method of facilitating processing within a computing environment, the computer-implemented method comprising:
obtaining a user-specified value for a floating point exception control for a selected instruction to be processed, the floating point exception control indicating a particular event;
determining, based on the user-specified value and another value for the floating point exception control provided by a centralized status exception control, an enablement control for the floating point exception control, wherein the determining comprises combining the user-specified value and the other value to provide a value for the enablement control; and
executing the selected instruction, wherein an indication of a floating point exception associated with execution of the selected instruction is enabled or disabled based on the value of the enablement control.
2. The computer-implemented method of claim 1 , wherein the particular event comprises an event selected from a group consisting of: an overflow, an underflow, an illegal operation, a sticky operation, a Not-a-Number operation, and an imprecise result indication.
3. The computer-implemented method of claim 1 , wherein the enablement control controls whether the floating point exception control provides an indication of the particular event.
4. The computer-implemented method of claim 1 , wherein the centralized status exception control is included in a floating point control register.
5. The computer-implemented method of claim 1 , wherein the user-specified value is provided via an exception control prefix included with the selected instruction.
6. The computer-implemented method of claim 1 , wherein the user-specified value is provided via a prefix instruction added to an instruction stream prior to the selected instruction.
7. The computer-implemented method of claim 6 , wherein the prefix instruction comprises at least one exception control field indicating at least one floating point exception control to be provided by the prefix instruction.
8. The computer-implemented method of claim 6 , wherein the prefix instruction further comprises at least one exception control field value indicating at least one user-specified value for the at least one floating point exception control.
9. The computer-implemented method of claim 7 , wherein the prefix instruction further includes an indicator to specify whether an exception control field of the at least one exception control field is enabled.
10. The computer-implemented method of claim 1 , further comprising:
determining which type of floating point instruction the floating point exception control is to be applied, wherein there is a plurality of types of floating point instructions including at least one of binary, decimal, hexadecimal and vector; and
applying the floating point exception control to the determined type of floating point instruction.