amomaxu.b.aq
Atomic MAX unsigned byte (acquire)
This instruction is defined by:
Synopsis
Atomically with acquire ordering:
-
Load the byte at address xs1
-
Write the sign-extended value into xd
-
Unsigned compare the least-significant byte of register xs2 to the loaded value, and select the maximum value
-
Write the maximum 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
memory_model_acquire();
XReg virtual_address = X[xs1];
X[xd] = amo(8, virtual_address, X[xs2][7:0], AmoOperation::Maxu, 1'b1, 1'b0, $encoding);if (implemented?(ExtensionName::A) && MISA_CSR_IMPLEMENTED && CSR[misa].A == 1'b0) {
reserved_instruction($encoding);
}
memory_model_acquire();
XReg virtual_address = X[xs1];
X[xd] = amo(8, virtual_address, X[xs2][7:0], AmoOperation::Maxu, 1'b1, 1'b0, $encoding);