rori
Rotate right (Immediate)
This instruction is defined by:
-
anyOf:
-
B, version >= 0
-
Zbb, version >= 0
-
Zbkb, version >= 0
-
Zk, version >= 0
-
Zkn, version >= 0
-
Zks, version >= 0
-
This instruction is included in the following profiles:
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RVA22U64 (Mandatory)
Synopsis
| This instruction must have data-independent timing when extension Zkt is enabled. |
This instruction performs a rotate right of rs1 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
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RV32
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RV64
Bits<5> shamt = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Bits<6> shamt = $encoding[25:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
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IDL
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Sail
if (implemented?(ExtensionName::B) && (CSR[misa].B == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg shamt = (xlen() == 32) ? shamt[4:0] : shamt[5:0];
X[rd] = (X[rs1] >> shamt) | (X[rs1] << (xlen() - shamt));{
let rs1_val = X(rs1);
let result : xlenbits = if sizeof(xlen) == 32
then rs1_val >>> shamt[4..0]
else rs1_val >>> shamt;
X(rd) = result;
RETIRE_SUCCESS
}