c.lbu
Load unsigned byte, 16-bit encoding
This instruction is defined by:
Synopsis
Loads a 8-bit value from memory into register xd.
It computes an effective address by adding the zero-extended offset, to the base address in register xs1.
It expands to lbu xd, offset(xs1).
Decode Variables
Bits<2> imm = {$encoding[5], $encoding[6]};
Bits<3> xd = $encoding[4:2];
Bits<3> xs1 = $encoding[9:7];Execution
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Pruned, XLEN == 64
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Original
XReg virtual_address = X[creg2reg(xs1)] + imm;
X[creg2reg(xd)] = read_memory(8, virtual_address, $encoding);if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[creg2reg(xs1)] + imm;
X[creg2reg(xd)] = read_memory(8, virtual_address, $encoding);