rori
Rotate right (Immediate)
This instruction is defined by:
Synopsis
Performs a rotate right of xs1 by the amount in the least-significant log2(XLEN) bits of shamt. For RV32, the encodings corresponding to shamt[5]=1 are reserved.
Decode Variables
Bits<6> shamt = $encoding[25:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];
Execution
-
Pruned, XLEN == 64
-
Original
if (implemented?(ExtensionName::B) && (misa.B == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg shamt = shamt[5:0];
X[xd] = (X[xs1] >> shamt) | (X[xs1] << (64 - shamt));