Restricted instructions in transactional execution
First Claim
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1. A computer-implemented method of performing processing associated with transactional execution in a computing environment, the computer-implemented method comprising:
- obtaining, by a processor, an instruction to be executed as part of a transaction of a nest of transactions;
computing one or more effective controls from one or more controls set by one or more transaction begin instructions initiating one or more transactions of the nest of transactions, the one or more effective controls comprising an effective allow floating point operation control that indicates whether specified floating point instructions are permitted to be executed;
determining by the processor whether the instruction is a selectively restricted instruction that is prohibited from execution within the transaction, the determining being based on the one or more effective controls computed from the one or more controls set by the one or more transaction begin instructions; and
performing processing associated with the instruction based on whether the instruction is selectively restricted.
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Abstract
Restricted instructions are prohibited from execution within a transaction. There are classes of instructions that are restricted regardless of type of transaction: constrained or nonconstrained. There are instructions only restricted in constrained transactions, and there are instructions that are selectively restricted for given transactions based on controls specified on instructions used to initiate the transactions.
328 Citations
10 Claims
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1. A computer-implemented method of performing processing associated with transactional execution in a computing environment, the computer-implemented method comprising:
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obtaining, by a processor, an instruction to be executed as part of a transaction of a nest of transactions; computing one or more effective controls from one or more controls set by one or more transaction begin instructions initiating one or more transactions of the nest of transactions, the one or more effective controls comprising an effective allow floating point operation control that indicates whether specified floating point instructions are permitted to be executed; determining by the processor whether the instruction is a selectively restricted instruction that is prohibited from execution within the transaction, the determining being based on the one or more effective controls computed from the one or more controls set by the one or more transaction begin instructions; and performing processing associated with the instruction based on whether the instruction is selectively restricted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification