builtins.c (expand_builtin_expect): New.

        * builtins.c (expand_builtin_expect): New.
        (expand_builtin): Call it.
        * builtins.def (BUILT_IN_EXPECT): New.
        * c-common.c (c_common_nodes_and_builtins): Declare __builtin_expect.
        * extend.texi: Document it.

        * predict.c (expected_value_to_br_prob): New.
        (find_expected_value): New.
        * basic-block.h (expected_value_to_br_prob): Declare.
        * toplev.c (rest_of_compilation): Invoke it.

        * rtl.h (NOTE_EXPECTED_VALUE): New.
        (NOTE_INSN_EXPECTED_VALUE): New.
        * rtl.c (note_insn_name): Update.
        * print-rtl.c (print_rtx): Reorg NOTE_LINE_NUMBER special
        cases; handle NOTE_INSN_EXPECTED_VALUE.

From-SVN: r33211

1 files changed, 5 insertions, 0 deletions

diff --git a/gcc/rtl.h b/gcc/rtl.h
index 9d655a2..5d86ab7 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -577,6 +577,7 @@ extern const char * const reg_note_name[];
 #define NOTE_RANGE_INFO(INSN)  	XCEXP(INSN, 3, NOTE)
 #define NOTE_LIVE_INFO(INSN)   	XCEXP(INSN, 3, NOTE)
 #define NOTE_BASIC_BLOCK(INSN)	XCBBDEF(INSN, 3, NOTE)
+#define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
 
 /* In a NOTE that is a line number, this is the line number.
    Other kinds of NOTEs are identified by negative numbers here.  */
@@ -664,6 +665,10 @@ enum insn_note
   /* Record the struct for the following basic block.  Uses NOTE_BASIC_BLOCK. */
   NOTE_INSN_BASIC_BLOCK,
 
+  /* Record the expected value of a register at a location.  Uses
+     NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)).  */
+  NOTE_INSN_EXPECTED_VALUE,
+
   NOTE_INSN_MAX
 };