c.lui
Load the non-zero 6-bit immediate field into bits 17-12 of the destination register
This instruction is defined by:
Synopsis
C.LUI loads the non-zero 6-bit immediate field into bits 17-12 of the destination register, clears the bottom 12 bits, and sign-extends bit 17 into all higher bits of the destination.
C.LUI expands into lui rd, imm.
C.LUI is only valid when rd≠x0 and rd≠x2, and when the immediate is not equal to zero.
The code points with imm=0 are reserved; the remaining code points with rd=x0 are HINTs; and the remaining code points with rd=x2 correspond to the C.ADDI16SP instruction
Decode Variables
Bits<18> imm = {$encoding[12], $encoding[6:2], 12'd0};
Bits<5> rd = $encoding[11:7];Execution
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Pruned, XLEN == 64
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Original
if ((%%LINK%csr_field;misa.C;CSR[misa].C%% == 1'b0)) {
%%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
}
X[rd] = $signed(imm);if (%%LINK%func;implemented?;implemented?%%(ExtensionName::C) && (%%LINK%csr_field;misa.C;CSR[misa].C%% == 1'b0)) {
%%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
}
X[rd] = $signed(imm);