G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.73
G06F 9/34 (2006.01) G06F 9/312 (2006.01) G06F 9/318 (2006.01) G06F 9/345 (2006.01) G06F 9/35 (2006.01) G06F 9/355 (2006.01) G06F 9/38 (2006.01)
Patent
CA 1273435
ABSTRACT A novel approach is described to solve the problem of lengthy loop execution time in a computer system for accessing structured data. Accordingly, all displacement-specified in- structured for either loading or storing data contain one bit that indicates whether the displacement is a register or a literal, viz., a constant, and another bit that indicates whether or not the base register should be updated with the effective address. If the displacement is a short literal, there is a further bit which specifies whether the address used to access memory is the pre- or post-modified base register; otherwise the post-modified value is used. Since no extra bit is used to convey information on modification, the displacement field in the instruction in accordance with the invention is at a maximum length. As a consequence, there also exists a form of loading or storing instruction having a maximum long displacement for modifying the base register. In this embodiment, pre- or post- modification is a function of the dispacement sign, which determines a step direction of increments or decrements.
512684
Baum Allen J.
Lee Ruby Bei-Loh
Muchnick Steven S.
Hewlett-Packard Co.
Sim & Mcburney
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