c.lwsp
Load word from stack pointer
This instruction is defined by:
Synopsis
Loads a 32-bit value from memory into register rd.
It computes an effective address by adding the zero-extended offset, scaled by 4,
to the stack pointer, x2.
It expands to lw rd, offset(x2).
C.LWSP is only valid when rd ≠ x0. The code points with rd=x0 are reserved.
Decode Variables
Bits<8> imm = {$encoding[3:2], $encoding[12], $encoding[6:4], 2'd0};
Bits<5> rd = $encoding[11:7];Execution
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Pruned, XLEN == 64
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Original
XReg virtual_address = X[2] + imm;
X[rd] = sext(read_memory<32>(virtual_address, $encoding), 32);if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[2] + imm;
X[rd] = sext(read_memory<32>(virtual_address, $encoding), 32);