vect: Fix infinite loop while determining peeling amount
This is a follow up to commit 5c9669a0e6
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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@ -1779,7 +1779,7 @@ vect_enhance_data_refs_alignment (loop_vec_info loop_vinfo)
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{
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vect_peeling_hash_insert (&peeling_htab, loop_vinfo,
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dr_info, npeel_tmp);
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npeel_tmp += target_align / dr_size;
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npeel_tmp += MAX (1, target_align / dr_size);
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}
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one_misalignment_known = true;
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