avr.h (MOVE_MAX): Set value to 1.

        * config/avr/avr.h (MOVE_MAX): Set value to 1.
        (MOVE_MAX_PIECES): Define.
        (MOVE_RATIO): Define.
        * config/avr/avr.c (TARGET_USE_BY_PIECES_INFRASTRUCTURE_P):
        Provide target hook.
        (avr_use_by_pieces_infrastructure_p): New function.

From-SVN: r231782

1 files changed, 25 insertions, 0 deletions

diff --git a/gcc/config/avr/avr.c b/gcc/config/avr/avr.c
index 609a42b..9cc95db 100644
--- a/gcc/config/avr/avr.c
+++ b/gcc/config/avr/avr.c
@@ -2431,6 +2431,27 @@ avr_print_operand (FILE *file, rtx x, int code)
 }
 
 
+/* Implement TARGET_USE_BY_PIECES_INFRASTRUCTURE_P.  */
+
+/* Prefer sequence of loads/stores for moves of size upto
+   two - two pairs of load/store instructions are always better
+   than the 5 instruction sequence for a loop (1 instruction
+   for loop counter setup, and 4 for the body of the loop). */
+
+static bool
+avr_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
+				     unsigned int align ATTRIBUTE_UNUSED,
+				     enum by_pieces_operation op,
+				     bool speed_p)
+{
+
+  if (op != MOVE_BY_PIECES || (speed_p && (size > (MOVE_MAX_PIECES))))
+    return default_use_by_pieces_infrastructure_p (size, align, op, speed_p);
+
+  return size <= (MOVE_MAX_PIECES);
+}
+
+
 /* Worker function for `NOTICE_UPDATE_CC'.  */
 /* Update the condition code in the INSN.  */
 
@@ -13763,6 +13784,10 @@ avr_fold_builtin (tree fndecl, int n_args ATTRIBUTE_UNUSED, tree *arg,
 #undef  TARGET_PRINT_OPERAND_PUNCT_VALID_P
 #define TARGET_PRINT_OPERAND_PUNCT_VALID_P avr_print_operand_punct_valid_p
 
+#undef TARGET_USE_BY_PIECES_INFRASTRUCTURE_P
+#define TARGET_USE_BY_PIECES_INFRASTRUCTURE_P \
+  avr_use_by_pieces_infrastructure_p
+
 struct gcc_target targetm = TARGET_INITIALIZER;