https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109303
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ok. It is yours then, for testcase perhaps:
--- gcc/testsuite/gcc.dg/pr109303.c.jj 2023-03-29 18:42:31.068144102 +0200
+++ gcc/testsuite/gcc.dg/pr109303.c 2023-03-29 18:42:18.328330526 +0200
@@ -0,0 +1,24 @@
+/* PR ipa/109303 */
+/* { dg-do compile { target lp64 } } */
+/* { dg-options "-O2" } */
+
+struct __attribute__((packed)) A { char c1; short a1[__INT_MAX__]; };
+struct __attribute__((packed)) B { char c2; short a2[100]; };
+struct S { struct A p1; struct B p2[4]; };
+void bar (short int);
+
+static void
+foo (struct S *q)
+{
+ for (int i = 0; i < q->p1.c1; i++)
+ for (int j = 0; j < q->p2[i].c2; j++)
+ bar (q->p2[i].a2[j]);
+}
+
+int
+main ()
+{
+ struct S q = {};
+ q.p2[0].c2 = q.p2[1].c2 = 3;
+ foo (&q);
+}
(without lp64 it obviously fails on 32-bit targets).
