tree-ssa-threadbackward.c (profitable_jump_thread_path): Treat same SSA names related.

2016-08-09  Richard Biener  <rguenther@suse.de>

	* tree-ssa-threadbackward.c (profitable_jump_thread_path):
        Treat same SSA names related.

From-SVN: r239276

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e71b548253ef25002454e547f87459aaccb05958..9cb04ca01b49e164c4d8f80b4eb97f198eabe228 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2016-08-09  Richard Biener  <rguenther@suse.de>
+
+       * tree-ssa-threadbackward.c (profitable_jump_thread_path):
+       Treat same SSA names related.
+
 2016-08-09  Jakub Jelinek  <jakub@redhat.com>
 
        PR tree-optimization/72824

diff --git a/gcc/tree-ssa-threadbackward.c b/gcc/tree-ssa-threadbackward.c
index 234ce50d10ca175e760c57bf8dcadeb1b2b53893..e05669f81472e17ad3334adb28bad2a395412679 100644 (file)
--- a/gcc/tree-ssa-threadbackward.c
+++ b/gcc/tree-ssa-threadbackward.c
@@ -207,8 +207,9 @@ profitable_jump_thread_path (vec<basic_block, va_gc> *&path,
                  /* Note that if both NAME and DST are anonymous
                     SSA_NAMEs, then we do not have enough information
                     to consider them associated.  */
-                 if ((SSA_NAME_VAR (dst) != SSA_NAME_VAR (name)
-                      || !SSA_NAME_VAR (dst))
+                 if (dst != name
+                     && (SSA_NAME_VAR (dst) != SSA_NAME_VAR (name)
+                         || !SSA_NAME_VAR (dst))
                      && !virtual_operand_p (dst))
                    ++n_insns;
                }