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Pixel-stage ballots and EXEC reads count only lanes that are not helper invocations, so a waterfall loop over a saved whole-quad EXEC picks and clears live lanes only. In programs that execute s_wqm on EXEC, writing EXEC from a value keeps a helper invocation active while a live lane of its quad is, so implicit-LOD sampling after a save/restore still has its helpers. Co-Authored-By: Claude Opus 5.5 <[email protected]>