amoor.d
Atomic fetch-and-or doubleword
This instruction is defined by:
Synopsis
Atomically:
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Load the doubleword at address rs1
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Write the loaded value into rd
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OR the value of register rs2 to the loaded value
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Write the result to the address in rs1
Decode Variables
Bits<1> aq = $encoding[26];
Bits<1> rl = $encoding[25];
Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
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Pruned, XLEN == 64
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Original
XReg virtual_address = X[rs1];
X[rd] = amo<64>(virtual_address, X[rs2], AmoOperation::Or, aq, rl, $encoding);if (implemented?(ExtensionName::A) && (CSR[misa].A == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[rs1];
X[rd] = amo<64>(virtual_address, X[rs2], AmoOperation::Or, aq, rl, $encoding);