+2006-10-10 Jakub Jelinek <jakub@redhat.com>
+
+ PR middle-end/29272
+ * builtins.c (var_decl_component_p): New function.
+ (fold_builtin_memset, fold_builtin_memory_op): Restrict
+ single entry optimization to variables and components thereof.
+
2006-10-10 Richard Guenther <rguenther@suse.de>
PR rtl-optimization/29323
return 0;
}
+/* Return true if VAR is a VAR_DECL or a component thereof. */
+
+static bool
+var_decl_component_p (tree var)
+{
+ tree inner = var;
+ while (handled_component_p (inner))
+ inner = TREE_OPERAND (inner, 0);
+ return SSA_VAR_P (inner);
+}
+
/* Fold function call to builtin memset. Return
NULL_TREE if no simplification can be made. */
&& !POINTER_TYPE_P (TREE_TYPE (var)))
return 0;
+ if (! var_decl_component_p (var))
+ return 0;
+
length = tree_low_cst (len, 1);
if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (var))) != length
|| get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT
&& !SCALAR_FLOAT_TYPE_P (TREE_TYPE (destvar)))
return 0;
+ if (! var_decl_component_p (destvar))
+ return 0;
+
srcvar = src;
STRIP_NOPS (srcvar);
if (TREE_CODE (srcvar) != ADDR_EXPR)
&& !SCALAR_FLOAT_TYPE_P (TREE_TYPE (srcvar)))
return 0;
+ if (! var_decl_component_p (srcvar))
+ return 0;
+
length = tree_low_cst (len, 1);
if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (destvar))) != length
|| get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT
--- /dev/null
+/* PR middle-end/29272 */
+
+extern void abort (void);
+
+struct S { struct S *s; } s;
+struct T { struct T *t; } t;
+
+static inline void
+foo (void *s)
+{
+ struct T *p = s;
+ __builtin_memcpy (&p->t, &t.t, sizeof (t.t));
+}
+
+void *
+__attribute__((noinline))
+bar (void *p, struct S *q)
+{
+ q->s = &s;
+ foo (p);
+ return q->s;
+}
+
+int
+main (void)
+{
+ t.t = &t;
+ if (bar (&s, &s) != (void *) &t)
+ abort ();
+ return 0;
+}