[PATCH] PR63676, exit tree fold when node be TREE_CLOBBER_P

  gcc/
    PR tree-optimization/63676
    * gimple-fold.c (fold_gimple_assign): Do not fold node when
    TREE_CLOBBER_P be true.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@217215 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 88b7422e7ee25bdfecf2d86af04e1b8b1a7fe028..7535286f915d6739a09255b2c716169c9bb67bc5 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2014-11-07  Jiong Wang  <jiong.wang@arm.com>
+2014-11-07  Richard Biener  <rguenther@suse.de>
+
+       PR tree-optimization/63676
+       * gimple-fold.c (fold_gimple_assign): Do not fold node when
+       TREE_CLOBBER_P be true.
+
 2014-11-07  Richard Biener  <rguenther@suse.de>
 
        PR middle-end/63770

diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index 547f9a75c36b982568dee6e42ed73d85b0049746..71e46388d61ef9c6a243c47326a664e453191544 100644 (file)
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -320,6 +320,9 @@ fold_gimple_assign (gimple_stmt_iterator *si)
       {
         tree rhs = gimple_assign_rhs1 (stmt);
 
+       if (TREE_CLOBBER_P (rhs))
+         return NULL_TREE;
+
        if (REFERENCE_CLASS_P (rhs))
          return maybe_fold_reference (rhs, false);