Suggested by Richard Henderson and Richard Kenner:

	* combine.c (recog_for_combine): Use the fake recog
	only if instruction does not match.
	* rtl.h (NOOP_MOVE_INSN_CODE): New.
	* rtlanal.c (noop_move_p): Always return 1 for NOOP_MOVE_INSN_CODE.

	* combine.c (try_combine): Discover noop jump as direct jump.

From-SVN: r44464

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/rtl.h b/gcc/rtl.h
index e7fdc98..da454c2 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -35,6 +35,10 @@ struct function;
 union tree_node;
 #endif
 
+/* Value used by some passes to "recognize" noop moves as valid instructions.
+ */
+#define NOOP_MOVE_INSN_CODE	INT_MAX
+
 /* Register Transfer Language EXPRESSIONS CODES */
 
 #define RTX_CODE	enum rtx_code