amoand.b.aq
Atomic fetch-and-and byte (acquire)
Atomically with acquire ordering:
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Load the byte at address xs1
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Write the sign-extended value into xd
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AND the least-significant byte of register xs2 to the loaded value
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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 = $encoding[11:7];Execution
if (implemented?(ExtensionName::A) && MISA_CSR_IMPLEMENTED && CSR[misa].A == 1'b0) {
reserved_instruction($encoding);
}
memory_model_acquire();
XReg virtual_address = X[xs1];
X[xd] = amo(8, virtual_address, X[xs2][7:0], AmoOperation::And, 1'b1, 1'b0, $encoding);Exceptions
This instruction may result in the following synchronous exceptions:
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IllegalInstruction
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LoadAccessFault
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StoreAmoAccessFault
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StoreAmoPageFault