24 lines
961 B
Diff
24 lines
961 B
Diff
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diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
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index 36639b697f1..88f14e73d65 100644
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--- a/gcc/tree-vect-data-refs.c
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+++ b/gcc/tree-vect-data-refs.c
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@@ -938,6 +938,18 @@ vect_compute_data_ref_alignment (dr_vec_info *dr_info)
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= exact _div (vect_calculate_target_alignment (dr_info), BITS_PER_UNIT);
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DR_TARGET_ALIGNMENT (dr_info) = vector_alignment;
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+ /* If the main loop has peeled for alignment we have no way of knowing
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+ whether the data accesses in the epilogues are aligned. We can't at
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+ compile time answer the question whether we have entered the main loop or
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+ not. Fixes PR 92351. */
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+ if (loop_vinfo)
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+ {
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+ loop_vec_info orig_loop_vinfo = LOOP_VINFO_ORIG_LOOP_INFO (loop_vinfo);
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+ if (orig_loop_vinfo
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+ && LOOP_VINFO_PEELING_FOR_ALIGNMENT (orig_loop_vinfo) != 0)
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+ return;
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+ }
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+
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unsigned HOST_WIDE_INT vect_align_c;
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if (!vector_alignment.is_constant (&vect_align_c))
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return;
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