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This is a follow up to commit 5c9669a0e6c respectively discussion https://gcc.gnu.org/pipermail/gcc-patches/2020-June/549132.html In case a type has a lower alignment than its size, ensure that we advance. For example, on s390x we have for a long double an alignment constraint of 8 bytes whereas the size is 16 bytes. Increasing the loop variable only by TARGET_ALIGN / DR_SIZE which equals zero in case of a long double results in an infinite loop. This is fixed by ensuring that we advance at least by one. gcc/ChangeLog: * tree-vect-data-refs.c (vect_enhance_data_refs_alignment): Ensure that loop variable npeel_tmp advances in each iteration.
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