Specialized millicode instructions for test PSW validity, load with access test, and character translation assist
US5694587A · kind A · utility
14Cited by
15References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1995 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Mar 31, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/0751
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pipelined computer processor in a milli-mode architected state tests the validity of a program status word with a mask stored in a millicode general register. The mask indicates bits in the program status word which are to be zeros if the word is valid. A logical AND operation is performed between correspondingly positioned bits in the word and bits in the mask and in addition the status of at least one other bit in the word is checked, a bit other than a correspondingly positioned bit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.