combine.c (distribute_notes): Cancel REG_VALUE_PROFILE notes.

	* combine.c (distribute_notes): Cancel REG_VALUE_PROFILE notes.
	* gcov-io.h (GCOV_FIRST_VALUE_COUNTER, GCOV_LAST_VALUE_COUNTER,
	GCOV_N_VALUE_COUNTERS): New.
	* profile.c (compute_value_histograms): New static function.
	(branch_prob): Read back the value histograms.
	* rtl.c (reg_note_name): Add name for REG_VALUE_PROFILE note.
	* rtl.h (enum reg_note): Add REG_VALUE_PROFILE note.
	* value-prof.c: Add comment on reading the profile.
	* value-prof.h (COUNTER_FOR_HIST_TYPE, HIST_TYPE_FOR_COUNTER): New.
	* doc/invoke.texi (-fprofile-values): Document behavior with
	-fbranch-probabilities.

From-SVN: r69969

1 files changed, 5 insertions, 0 deletions

diff --git a/gcc/rtl.h b/gcc/rtl.h
index 9d3b0dc..8fb2574 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -684,6 +684,11 @@ enum reg_note
      return.  */
   REG_BR_PROB,
 
+  /* REG_VALUE_PROFILE is attached when the profile is read in to an insn
+     before that the code to profile the value is inserted.  It contains
+     the results of profiling.  */
+  REG_VALUE_PROFILE,
+
   /* Attached to a call insn; indicates that the call is malloc-like and
      that the pointer returned cannot alias anything else.  */
   REG_NOALIAS,