Boots – shoes – and leggings
Patent
1993-09-20
1995-08-08
Ray, Gopal C.
Boots, shoes, and leggings
3642318, 3642624, 364247, 3642476, 3642478, 364DIG1, G06F 930, G06F 938
Patent
active
054407036
ABSTRACT:
An apparatus and method provides additional logic in both execution units of a dual execution unit processing in order to determine if the instruction is interruptable. Additionally, backout logic is provided for saving the contents of unique registers. The backout logic uses two decodes to determine if the instruction currently executing modifies the unique registers. It is possible for a single instruction to modify more than one unique register. The backout logic of the present invention resides in both of the execution units and particularly in the unit which contains the unique register being modified by the executing instruction. If an instruction is being executed which modifies one of the unique registers, then the contents of that register are saved in a backout latch. A cancel signal is then provided if the interruptable instruction executes without causing an interrupt. However, if the interruptable instruction does cause an interrupt, then the contents of the backout latch are reloaded into the execution units.
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Ray David S.
Spencer Alexander K.
International Business Machines - Corporation
McBurney Mark E.
Ray Gopal C.
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