With the current handling of decl alignments it is impossible to
reduce the alignment requirement as part of a variable declaration.
This change has been proposed by Richard in the PR. It fixes the
align-1.c testcase on IBM Z.
Bootstrapped on x86_64 and s390x. No regressions.
Ok for mainline?
gcc/ChangeLog:
PR middle-end/88085
* emit-rtl.c (set_mem_attributes_minus_bitpos): Use the user
alignment if there are no pre-existing mem attrs.
---
gcc/emit-rtl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 07e908624a0..fc12fa927da 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -2124,7 +2124,7 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int
objectp,
unsigned int diff_align = known_alignment (obj_bitpos - bitpos);
if (diff_align != 0)
obj_align = MIN (obj_align, diff_align);
- attrs.align = MAX (attrs.align, obj_align);
+ attrs.align = refattrs ? MAX (refattrs->align, obj_align) : obj_align;
}
poly_uint64 const_size;
--
2.30.2
