Optimizations for KeySwitchCore/EvalFastRotation#1187
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pascoec
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yspolyakov
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May 18, 2026
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Modified the implementation of EvalFastRotation() for Hybrid Keyswitching to invert the order of ModDown() and AutomorphismTransform() as described in equation 11 of KLK+22. The change trades slightly higher computation for better memory performance and a significant performance boost on GPU backends. Other optimizations within KeySwitchCore lead to faster performance than the previous implementation.