@@ -67,6 +67,8 @@ along with GCC; see the file COPYING3. If not see
#include "tree-vector-builder.h"
#include "tree-ssa-strlen.h"
#include "varasm.h"
+#include "memmodel.h"
+#include "optabs.h"
enum strlen_range_kind {
/* Compute the exact constant string length. */
@@ -957,14 +959,17 @@ gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi,
= build_int_cst (build_pointer_type_for_mode (char_type_node,
ptr_mode, true), 0);
- /* If we can perform the copy efficiently with first doing all loads
- and then all stores inline it that way. Currently efficiently
- means that we can load all the memory into a single integer
- register which is what MOVE_MAX gives us. */
+ /* If we can perform the copy efficiently with first doing all loads and
+ then all stores inline it that way. Currently efficiently means that
+ we can load all the memory with a single set operation and that the
+ total size is less than MOVE_MAX * MOVE_RATIO. */
src_align = get_pointer_alignment (src);
dest_align = get_pointer_alignment (dest);
if (tree_fits_uhwi_p (len)
- && compare_tree_int (len, MOVE_MAX) <= 0
+ && (compare_tree_int
+ (len, (MOVE_MAX
+ * MOVE_RATIO (optimize_function_for_size_p (cfun))))
+ <= 0)
/* FIXME: Don't transform copies from strings with known length.
Until GCC 9 this prevented a case in gcc.dg/strlenopt-8.c
from being handled, and the case was XFAILed for that reason.
@@ -1000,6 +1005,7 @@ gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi,
if (type
&& is_a <scalar_int_mode> (TYPE_MODE (type), &mode)
&& GET_MODE_SIZE (mode) * BITS_PER_UNIT == ilen * 8
+ && have_insn_for (SET, mode)
/* If the destination pointer is not aligned we must be able
to emit an unaligned store. */
&& (dest_align >= GET_MODE_ALIGNMENT (mode)