Check for volatile flag to ipa_load_from_parm_agg.
gcc/ChangeLog:
2022-06-10 Jan Hubicka <hubicka@ucw.cz>
PR ipa/105739
* ipa-prop.cc (ipa_load_from_parm_agg): Punt on volatile loads.
gcc/testsuite/ChangeLog:
2022-06-10 Jan Hubicka <hubicka@ucw.cz>
* gcc.dg/ipa/pr105739.c: New test.
(cherry picked from commit
8f6c317b3a16350698f3c9e0accb43a9b4acb4ae)
if (!base)
return false;
+ /* We can not propagate across volatile loads. */
+ if (TREE_THIS_VOLATILE (op))
+ return false;
+
if (DECL_P (base))
{
int index = ipa_get_param_decl_index_1 (descriptors, base);
--- /dev/null
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+
+__attribute__((noinline))
+static int
+test2(int a)
+{
+ if (__builtin_constant_p (a))
+ __builtin_abort ();
+ return a;
+}
+static int
+test(int *a)
+{
+ int val = *(volatile int *)a;
+ if (__builtin_constant_p (val))
+ __builtin_abort ();
+ if (val)
+ return test2(val);
+ return 0;
+}
+int a;
+int
+main()
+{
+ a = 0;
+ return test (&a);
+}
+/* { dg-final { scan-tree-dump "test2" "optimized" } } */