| 摘要 |
PURPOSE:To make it unnecessary to execute a line form-processing at every loop processing, by positioning an entry instruction of a loop at a word boundary position, and interposing a no-operation instruction instead, in case when the entry instruction concerned does not exist in the word boundary position. CONSTITUTION:In case when a 1-word length instruction is stored as 4-byte from a word boundary position (code 4), the whole of a desired 1-word length instruction can be inputted by fetching of once. In case when the 1-word length instruction is stored as 4-byte from a position which is not the word boundary position (code 5), usually the first half of the instruction concerned 5 is inputted by fetching of the first 1-word portion, the latter half of the instruction concerned 5 is inputted by fetching of the following 1-word portion, and it becomes necessary to form a line by a line form-processing function 3, but first of all, the instruction is positioned in the word boundary position (code 6), instead of which a no- operation instruction of a non-1-word length instruction is interposed (code 7). In this way, it is unnecessary to execute a line form-processing at every loop processing, and the efficiency can be improved as a whole. |
