Appeal No. 1998-1510
Application No. 08/205,737
The invention is directed to a method of cache memory
storage space management.
Independent claim 1 is reproduced as follows:
1. A method of managing POP read data information
contained in a stack cache memory device, in a computer system
having a main memory and a processor associated with the stack
cache memory device, said stack cache memory device including
at least one cache line containing a plurality of words having
adjacent address locations, said address locations arranged
from a lowest address to a highest address within said at
least one cache line, said method comprising the steps of:
(i) initiating a POP read operation with said processor
to read data;
(ii) determining if said read data is contained within
said stack cache memory device;
(iii) determining if said read data corresponds to the
highest address word in said at least one cache line; and
(iv)(a) passing said read data from said stack cache
memory device to said processor and invalidating all of said
plurality of address locations in said at least one cache line
if said read data is contained within said stack cache memory
device and said read data corresponds to the highest address
word in said at least one cache line; or
(iv)(b) directing said processor to retrieve said read
data from said main memory without copying said read data to
said at least one cache line if said read data is not
contained within said stack cache memory device and said read
data corresponds to the highest address word in said at least
one cache line; else
2
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