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# DP: Fix PR middle-end/80533, taken from the trunk.
gcc/
2017-04-27 Richard Biener <rguenther@suse.de>
PR middle-end/80533
* emit-rtl.c (set_mem_attributes_minus_bitpos): When
stripping ARRAY_REFs from MEM_EXPR make sure we're not
keeping a reference to a trailing array.
--- a/src/gcc/emit-rtl.c
+++ b/src/gcc/emit-rtl.c
@@ -1954,7 +1954,10 @@
while (TREE_CODE (t2) == ARRAY_REF);
if (DECL_P (t2)
- || TREE_CODE (t2) == COMPONENT_REF)
+ || (TREE_CODE (t2) == COMPONENT_REF
+ /* For trailing arrays t2 doesn't have a size that
+ covers all valid accesses. */
+ && ! array_at_struct_end_p (t)))
{
attrs.expr = t2;
attrs.offset_known_p = false;
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