+2005-01-11 Zdenek Dvorak <dvorakz@suse.cz>
+
+ PR tree-optimization/17949
+ * tree-ssa-loop-ivopts.c (may_be_unaligned_p): New function.
+ (find_interesting_uses_address): Use it.
+
2005-01-11 Aldy Hernandez <aldyh@redhat.com>
* regrename.c (kill_value): Handle subreg's that won't simplify.
return true;
}
+/* Returns true if memory reference REF may be unaligned. */
+
+static bool
+may_be_unaligned_p (tree ref)
+{
+ tree base;
+ tree base_type;
+ HOST_WIDE_INT bitsize;
+ HOST_WIDE_INT bitpos;
+ tree toffset;
+ enum machine_mode mode;
+ int unsignedp, volatilep;
+ unsigned base_align;
+
+ /* The test below is basically copy of what expr.c:normal_inner_ref
+ does to check whether the object must be loaded by parts when
+ STRICT_ALIGNMENT is true. */
+ base = get_inner_reference (ref, &bitsize, &bitpos, &toffset, &mode,
+ &unsignedp, &volatilep, true);
+ base_type = TREE_TYPE (base);
+ base_align = TYPE_ALIGN (base_type);
+
+ if (mode != BLKmode
+ && (base_align < GET_MODE_ALIGNMENT (mode)
+ || bitpos % GET_MODE_ALIGNMENT (mode) != 0
+ || bitpos % BITS_PER_UNIT != 0))
+ return true;
+
+ return false;
+}
+
/* Finds addresses in *OP_P inside STMT. */
static void
&& DECL_NONADDRESSABLE_P (TREE_OPERAND (base, 1)))
goto fail;
+ if (STRICT_ALIGNMENT
+ && may_be_unaligned_p (base))
+ goto fail;
+
ifs_ivopts_data.ivopts_data = data;
ifs_ivopts_data.stmt = stmt;
ifs_ivopts_data.step_p = &step;