destruction of the operands to IEEE standard (IEEE Standard for Floating-Point Arithmetic 25. "Zfa" Extension for Control and Status Registers (CSRs) 2.1. CSR Address Mapping Conventions 2.2. CSR Listing Table 4-Table 8 list the RVC instructions. Figure 29. SYSTEM instruction encodings (Kerckhoffs’s principle), so instruction timing may leak information
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