5c9669a0e6
In the test case for PR95961, vectorization factor computed by vect_determine_vectorization_factor is [8,8]. But this is updated to [1,1] later by vect_update_vf_for_slp. When we call vect_get_num_vectors in vect_enhance_data_refs_alignment, the number of scalars which is based on the vectorization factor is not a multiple of the the number of elements in the vector type. This leads to the ICE. This isn't a simple stream of contiguous vector accesses. It's hard to predict from the available information how many vector accesses we'll actually need per iteration. As discussed, here we should use the number of scalars instead of the number of vectors as an upper bound for the loop saving info about DR in the hash table. 2020-07-02 Felix Yang <felix.yang@huawei.com> gcc/ PR tree-optimization/95961 * tree-vect-data-refs.c (vect_enhance_data_refs_alignment): Use the number of scalars instead of the number of vectors as an upper bound for the loop saving info about DR in the hash table. Remove unused local variables. gcc/testsuite/ PR tree-optimization/95961 * gcc.target/aarch64/sve/pr95961.c: New test. |
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README
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