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// Extract Instruction from the "Top" // Assuming 32-bit system (XLEN=32), the inst is bits 31:2 // Assuming 64-bit system (XLEN=64), the inst is bits 63:32 uint32_t instruction = (uint32_t)(mtinst_val >> (XLEN - 32));

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The placement of instruction bits at the top is optimized for . RISC-V supports variable length instructions (16-bit, 32-bit, and potentially longer). (XLEN - 32))