roriw
Rotate right word (Immediate)
This instruction is defined by:
Synopsis
This instruction performs a rotate right on the least-significant word of rs1 by the amount in the least-significant log2(XLEN) bits of shamt. The resulting word value is sign-extended by copying bit 31 to all of the more-significant bits.
Decode Variables
Bits<5> shamt = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
-
Pruned, XLEN == 64
-
Original
if ((%%LINK%csr_field;misa.B;CSR[misa].B%% == 1'b0)) {
%%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
}
XReg rs1_word = X[rs1][31:0];
XReg unextended_result = (X[rs1] >> shamt) | (X[rs1] << (32 - shamt));
X[rd] = {{32{unextended_result[31]}}, unextended_result};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 rs1_word = X[rs1][31:0];
XReg unextended_result = (X[rs1] >> shamt) | (X[rs1] << (32 - shamt));
X[rd] = {{32{unextended_result[31]}}, unextended_result};