公开(公告)号：FR2376460A1

公开(公告)日：1978-07-28

申请号：FR7735664

申请日：1977-11-18

Applicant: IBM

Inventor： DAVIS MICHAEL I ,  HOOD ROBERT A ,  MAYES GARY W

IPC: G06F9/305 ,  G06F9/34 ,  G06F12/04 ,  G06F9/06 ,  G06F7/38

Abstract: A method of accessing variable-length bit fields in the memory of an electronic data processing system irrespective of the relationship between the boundaries of addressable elements within said memory and the start and end of the bit fields comprising the operations of: setting the initial values of a base register within said system to contain a representation of a base address of an addressable element; setting the initial values of a shift register within said system to contain a representation of the offset in said memory of the beginning of a particular bit field from said base address; combining the contents of said base and offset registers in such a way as to provide a representation of the position in said memory of the first bit of said particular bit field; create a single instruction that contains a representation of the length of said particular bit field. (Machine-translation by Google Translate, not legally binding)

公开(公告)号：FR2349918A1

公开(公告)日：1977-11-25

申请号：FR7706016

申请日：1977-02-24

Applicant: IBM

Inventor： BIRNEY RICHARD E ,  DAVIS MICHAEL I ,  HOOD ROBERT A

IPC: G06F11/00 ,  G06F12/00 ,  G06F12/06 ,  G06F12/14 ,  G06F15/16 ,  G06F15/177 ,  G06F21/24 ,  G11C8/00