Zacas Extension Versions 1.0.0 State ratified Ratification date == Synopsis Adds Word/Doubleword/Quadword compare-and-swap instructions. Instructions The following instructions are affected by this extension: amocas.d Atomic Compare-and-Swap Doubleword amocas.q Atomic Compare-and-Swap Quadword amocas.w Atomic Compare-and-Swap Word