amoxor.w
Atomic fetch-and-xor word
This instruction is defined by:
Synopsis
Atomically:
-
Load the word at address xs1
-
Write the sign-extended value into xd
-
XOR the least-significant word of register xs2 to the loaded value
-
Write the result to the address in xs1
Decode Variables
Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];Execution
-
Pruned, XLEN == 64
-
Original
if (!implemented?(ExtensionName::A) || misa.A == 1'b0) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[xs1];
X[xd] = amo<32>(virtual_address, X[xs2][31:0], AmoOperation::Xor, 1'b0, 1'b0, $encoding);if (!implemented?(ExtensionName::A) || (MISA_CSR_IMPLEMENTED && (misa.A == 1'b0))) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[xs1];
X[xd] = amo<32>(virtual_address, X[xs2][31:0], AmoOperation::Xor, 1'b0, 1'b0, $encoding);