opencl: Q6_K GEMM/GEMV fix for ne01 of weights that are not multiples of 128. #25464
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max-krasnyansky merged 3 commits intoJul 8, 2026
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…dreno Observed with granite-3.1-3b-a800m-instruct, whose vocab is an odd number. Route Q6_K dense mul_mat with ne01 % 128 != 0 off the noshuffle path: decode (ne1==1) uses the correct flat GEMV and the matching GEMM (ne1>1) falls back to CPU (the flat convert has no verified small-batch GEMM kernel for these shapes). All standard hidden/FFN/vocab dims are multiples of 128 and keep the noshuffle path.
…size set_tensor carves quantized weights into per-component subbuffers (d/q, ql/qh/s/d, ...) whose origins are each rounded up to the device base address alignment. When a component's size is not a multiple of the alignment, the carve extends past ggml_nbytes(tensor) and the last subbuffer overlaps the next tensor in the pool -- e.g. q6_K [1536, 49155]: size_s = 49155*96 ends 32 bytes past a 128-byte boundary, so the d subbuffer ends 96 bytes past the tensor's allocation, and whichever of the two neighboring tensors is uploaded last silently corrupts the other (here: the last vocab rows' block scales). This affects any quant type whose component sizes can be misaligned, on any shape with ne01 not a multiple of the alignment granularity; standard power-of-two dims are unaffected. Implement get_alloc_size for the OpenCL buffer type and reserve the worst-case carve slack (4 aligned gaps; 5 components max, q5_K) for quantized tensors. Costs at most 512 bytes per quantized tensor at the observed 128-byte alignment.
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Overview
The Adreno no-shuffle (transposed-weight) Q6_K GEMM and GMMV require ne01 of weights to be multiple of 128 (ne01 % 128 == 0), which is generally fine for large models. This requirement is broken for models like granite-3.1-3b-a800m-instruct, in which the vocab size is an odd number and therefore the model produces gibberish output.
This PR fixes this by routing GEMM/GEMV with such weights to the general kernels.
Additional information
The bug only affects very small models.
Requirements