From: Jan Hubicka <jh@suse.cz>
Date: Mon, 11 Jun 2001 13:49:24 +0000 (+0200)
Subject: * jump.c (duplicate_loop_exit_test): Fix loop header heuristics.
X-Git-Tag: prereleases/libstdc++-3.0.95~3851
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4bb83350d48a512294f661a484353481b97e7360;p=thirdparty%2Fgcc.git

* jump.c (duplicate_loop_exit_test): Fix loop header heuristics.

From-SVN: r43189
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c39562b2ca44..5f480ff643b4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jun 11 15:47:45 CEST 2001  Jan Hubicka  <jh@suse.cz>
+
+	* jump.c (duplicate_loop_exit_test): Fix loop header heuristics.
+
 2001-06-11  Joseph S. Myers  <jsm28@cam.ac.uk>
 
 	* c-decl.c (store_parm_decls): When comparing types in an
diff --git a/gcc/jump.c b/gcc/jump.c
index 067b7aafcdc0..cc87b6876412 100644
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -1257,10 +1257,11 @@ duplicate_loop_exit_test (loop_start)
 	      rtx label = JUMP_LABEL (copy);
 	      if (label)
 		{
-		  if (PREV_INSN (label)
-		      && GET_CODE (PREV_INSN (label)) == NOTE
-		      && (NOTE_LINE_NUMBER (PREV_INSN (label))
-			  == NOTE_INSN_LOOP_CONT))
+		  /* The jump_insn after loop_start should be followed
+		     by barrier and loopback label.  */
+		  if (prev_nonnote_insn (label)
+		      && (PREV_INSN (prev_nonnote_insn (label))
+			  == NEXT_INSN (loop_start)))
 		    predict_insn_def (copy, PRED_LOOP_HEADER, TAKEN);
 		  else
 		    predict_insn_def (copy, PRED_LOOP_HEADER, NOT_TAKEN);