Character data string match determination by loading registers at most up to memory block boundary and comparing to avoid unwarranted exception
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United States of America Patent
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Oct 25, 2016
Grant Date -
Mar 26, 2015
app pub date -
Dec 4, 2014
filing date -
Mar 15, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
Multiple sets of character data having termination characters are compared using parallel processing and without causing unwarranted exceptions. Each set of character data to be compared is loaded within one or more vector registers. In particular, in one embodiment, for each set of character data to be compared, an instruction is used that loads data in a vector register to a specified boundary, and provides a way to determine the number of characters loaded. Further, an instruction is used to find the index of the first delimiter character, i.e., the first zero or null character, or the index of unequal characters. Using these instructions, a location of the end of one of the sets of data or a location of an unequal character is efficiently provided.
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