Decoding instructions that are modified by one or more other instructions
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United States of America Patent
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Feb 20, 2018
Issued Date -
N/A
app pub date -
May 27, 2015
filing date -
May 27, 2014
priority date (Note) -
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Abstract
Methods and apparatus are provided for decoding instructions in a computer program wherein the instructions include one or more base instructions that are subject to modification by one or more other instructions. A decoder determines whether a first received instruction was arrived at by a non-incremental change to a program counter (i.e. a jump in the program). If the first instruction was arrived at by a non-incremental change to the program counter the decoder decodes the immediately preceding instruction to determine if the original instruction is a base instruction subject to modification by one or more other instructions. If the preceding instruction indicates that the original instruction is a base instruction an error has occurred and exception handling code is invoked.
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