rol
Rotate left (Register)
This instruction is defined by:
Synopsis
This instruction performs a rotate left of rs1 by the amount in least-significant log2(XLEN) bits of rs2.
Decode Variables
Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
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Pruned, XLEN == 64
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Original
if ((%%LINK%csr_field;misa.B;CSR[misa].B%% == 1'b0)) {
%%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
}
XReg shamt = X[rs2][5:0];
X[rd] = (X[rs1] << shamt) | (X[rs1] >> (64 - shamt));if (%%LINK%func;implemented?;implemented?%%(ExtensionName::B) && (%%LINK%csr_field;misa.B;CSR[misa].B%% == 1'b0)) {
%%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
}
XReg shamt = (%%LINK%func;xlen;xlen%%() == 32) ? X[rs2][4:0] : X[rs2][5:0];
X[rd] = (X[rs1] << shamt) | (X[rs1] >> (%%LINK%func;xlen;xlen%%() - shamt));