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Editing macro-operation fusion
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== Overview & Motivation == | == Overview & Motivation == | ||
− | One of the three [[microprocessor performance|performance knobs of a microprocessor]] is the [[instruction count]]. By reducing the number of instructions that must be executed, more work can be done with | + | One of the three [[microprocessor performance|performance knobs of a microprocessor]] is the [[instruction count]]. By reducing the number of instructions that must be executed, more work can be done with lower resource usage. The idea behind macro-operation fusion is to combine multiple adjacent instructions into a single instruction. A fused instruction typically remains fused throughout its lifetime. Therefore fused instructions can represent more work with fewer bits, free up execution units, tracking information (e.g. in the [[register renaming|rename unit]]), save pipeline bandwidth in all stages from decode to retire, and consequently save power. |
A unique aspect of macro-op fusion is that it also helps workloads that are not compiled such as in the case of many [[interpreted programming languages]] (e.g. [[PHP]], the software running WikiChip). | A unique aspect of macro-op fusion is that it also helps workloads that are not compiled such as in the case of many [[interpreted programming languages]] (e.g. [[PHP]], the software running WikiChip). |