PFPO Instruction with Test Bit for Floating-Point Function Availability
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Solution Overview
Problem
Current computer systems lack a floating-point operation instruction that can determine whether a requested floating-point function is installed and, if not, inform the program accordingly, leading to potential errors or crashes when attempting to perform unsupported operations.
Innovation Solution
The introduction of a Perform Floating-Point Operation (PFPO) instruction that uses a test bit to check if a specified floating-point conversion function is installed, setting a condition code to indicate whether the function is valid or not, allowing programs to handle unsupported functions gracefully.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a floating-point operation instruction is executed without checking function availability, then the operation can be performed when supported, but the system crashes or produces errors when the function is not installed
Solution Approach 1:
The patent applies preliminary action by checking function availability before executing the floating-point operation. The instruction includes a test bit that, when set, causes the system to check if the specified floating-point conversion function is installed before attempting to execute it. This prevents system crashes by detecting unsupported functions in advance, thereby improving reliability without significantly increasing instruction complexity.
2Reliability
If a floating-point operation instruction checks for function availability, then unsupported functions can be detected, but the instruction execution time increases
Solution Approach 1:
The patent applies partial action by making the function availability check optional through the test bit. When the test bit is clear (0), the instruction executes normally without the availability check, maintaining fast execution for common cases. When the test bit is set (1), the availability check is performed. This selective approach provides reliable function detection when needed while minimizing time loss for routine operations.
3Adaptability or versatility
If multiple floating-point conversion functions are provided, then more operations can be performed, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a single PFPO (Perform Floating-Point Operation) instruction that can perform multiple floating-point conversion functions. The instruction uses a function code field to specify different conversion types (e.g., binary to decimal, decimal to binary, format conversions) and a format field to specify operand formats. This multi-functional approach provides versatile floating-point support while maintaining a compact instruction set, as one instruction replaces what would otherwise require multiple separate instructions.
Data Source
AI summary
Execution of a machine instruction in a central processing unit. A perform floating-point operation instruction and a test bit are obtained. If the test bit has a first value, a specified floating-point operation function is performed, and a condition code is set to a value determined by the specified function. If the test bit has a second value, a check is made to determine if the specified function is valid and installed on the machine. If the specified function is valid and installed on the machine, the condition code is set to one code value, and if the specified function is either not valid or not installed on the machine, the condition code is set to a second code value.