c.jal

Jump and Link

This instruction is defined by:

Encoding

Synopsis

C.JAL is an RV32C-only instruction that performs the same operation as C.J, but additionally writes the address of the instruction following the jump (pc+2) to the link register, x1. It expands to jal x1, offset.

Access

Always

Decode Variables

signed Bits<12> imm = sext({$encoding[12], $encoding[8], $encoding[10:9], $encoding[6], $encoding[7], $encoding[2], $encoding[11], $encoding[5:3], 1'd0});

Execution

Pruned, XLEN == 32
Original

XReg retrun_addr = $pc + 2;
jump_halfword($pc + imm);
X[1] = retrun_addr;

if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg retrun_addr = $pc + 2;
jump_halfword($pc + imm);
X[1] = retrun_addr;