c.nop

Non-operation

This instruction is defined by:

Encoding

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Synopsis

C.NOP does not change any user-visible state, except for advancing the pc and accepting any HINTs. C.NOP expands into addi x0, x0, 0. C.NOP with non-zero immediate values are HINTs.

Access

M HS U VS VU

Always

Always

Always

Always

Always

Decode Variables

signed Bits<6> imm = sext({$encoding[12], $encoding[6:2]}, 6);

Execution

  • Pruned, XLEN == 64

  • Original

if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}