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PerformanceFix: Remove opcode decoding from the decoder
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The hardware implicitly decodes part of the instruction for us by
telling which kind of exception we have. Therefore, we don't need to
decode the opcode in the decoder and this optimization let us win a few
cycles and make the formal verification a bit easier


Co-authored-by: Charly Castes <charly.castes@epfl.ch>
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@francois141 @CharlyCst
francois141 and CharlyCst committed Jan 9, 2025
1 parent b378908 commit a582a36
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