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The `if (tid < 64)` guard only let half the threads participate in the 128-element Walsh-Hadamard Transform, leaving elements 64-127 untransformed. This caused warp divergence and register pressure that crashes low-CU iGPUs (AMD 780M / gfx1103 with 6 CUs). Replace with proper bounds check `if (i + h < TURBO_HEAD_DIM)` so all 128 threads participate naturally. Fixes both correctness (full FWHT over all elements) and GPU occupancy on resource-constrained hardware. Affects: dequantize_block_turbo3_0, dequantize_block_turbo4_0, k_set_rows_turbo3, k_set_rows_turbo4 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>