Condition code flag emulation for program code conversion
US7331040B2 · kind B2 · utility
13Cited by
67References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2003 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | Oct 3, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/45537
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An emulator (30) allows subject code (10) written for a subject processor (12) having subject processor registers (14) and condition code flags (16) to run in a non-compatible computing environment (2). The emulator (30) identifies and records parameters of instructions in the subject code (10) that affect status of the subject condition code flags (16). Then, when an instruction in the subject code (10) is encountered, such as a branch or jump, that uses the flag status to make a decision, the flag status is resolved from the recorded instruction parameters. Advantageously, emulation overhead is substantially reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.