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Bitwise. One warp per atom, each lane taking the box's points t = lane, lane + 32, ...: every point cost three integer divisions/modulos to turn t into (u, v, w) and three more (imod) to wrap them into the grid. The lane now steps (iu, iv, iw) on by 32 points with adds and carries, and wraps from the box's first point, wrapped once per atom (a box is narrower than the cell, so one conditional subtraction per axis). The same points in the same order per lane, the same arithmetic. atom_gradient_kernel (nsys, side by side): 5reo 426 -> 237 us, 5f6m 887 -> 523, 9yl4 1436 -> 802, 7d98 692 -> 388 us per launch. Refined CIF md5 unchanged on the 5 GPU cases; side by side = one at a time. Wall: 5reo 1.43 -> 1.35, 5f6m 2.20 -> 2.00, 9yl4 6.88 -> 6.82, 7d98 3.58 -> 3.38, 5f6m MD start 4.16 -> 3.71 s. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu (cherry picked from commit 6554e9dcbe4b448eda582eb76d6a24c59fe6ab0c)