lang.c (java_estimate_num_insns_1): Fix bug in MODIFY_EXPR cost estimation.

	* lang.c (java_estimate_num_insns_1): Fix bug in MODIFY_EXPR cost
	estimation.
	* c-common.c (c_estimate_num_insns_1):  Fix bug in MODIFY_EXPR
	cost estimation.
	* expr.c (MOVE_RATIO, CLEAR_RATIO): Move to ...
	* expr.h (MOVE_RATIO, CLEAR_RATIO): ... here.

From-SVN: r75821

1 files changed, 24 insertions, 0 deletions

diff --git a/gcc/expr.h b/gcc/expr.h
index bdfd490..0000113 100644
--- a/gcc/expr.h
+++ b/gcc/expr.h
@@ -66,6 +66,30 @@ enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM = 2, EXPAND_SUM,
    more information.  */
 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
 
+/* If a memory-to-memory move would take MOVE_RATIO or more simple
+   move-instruction sequences, we will do a movstr or libcall instead.  */
+
+#ifndef MOVE_RATIO
+#if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi) || defined (HAVE_movstrti)
+#define MOVE_RATIO 2
+#else
+/* If we are optimizing for space (-Os), cut down the default move ratio.  */
+#define MOVE_RATIO (optimize_size ? 3 : 15)
+#endif
+#endif
+
+/* If a clear memory operation would take CLEAR_RATIO or more simple
+   move-instruction sequences, we will do a clrstr or libcall instead.  */
+
+#ifndef CLEAR_RATIO
+#if defined (HAVE_clrstrqi) || defined (HAVE_clrstrhi) || defined (HAVE_clrstrsi) || defined (HAVE_clrstrdi) || defined (HAVE_clrstrti)
+#define CLEAR_RATIO 2
+#else
+/* If we are optimizing for space, cut down the default clear ratio.  */
+#define CLEAR_RATIO (optimize_size ? 3 : 15)
+#endif
+#endif
+
 enum direction {none, upward, downward};
 
 /* Structure to record the size of a sequence of arguments