1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/tree.h b/gcc/tree.h
index 17f0475..0f78e74 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1304,12 +1304,23 @@ struct tree_exp GTY(())
 #define SSA_NAME_OCCURS_IN_ABNORMAL_PHI(NODE) \
     SSA_NAME_CHECK (NODE)->common.asm_written_flag
 
+
 /* Nonzero if this SSA_NAME expression is currently on the free list of
    SSA_NAMES.  Using NOTHROW_FLAG seems reasonably safe since throwing
    has no meaning for an SSA_NAME.  */
 #define SSA_NAME_IN_FREE_LIST(NODE) \
     SSA_NAME_CHECK (NODE)->common.nothrow_flag
 
+#define SSA_NAME_EQUIV(NAME) __extension__ \
+  ({  tree equiv = SSA_NAME_CHECK (NAME)->ssa_name.equiv; \
+      if (equiv && TREE_CODE (equiv) == SSA_NAME) \
+	equiv = ssa_name (SSA_NAME_VERSION (equiv)); \
+      equiv; \
+   })
+
+#define SET_SSA_NAME_EQUIV(NAME, EQUIV)\
+   SSA_NAME_CHECK (NAME)->ssa_name.equiv = (EQUIV);
+
 /* Attributes for SSA_NAMEs for pointer-type variables.  */
 #define SSA_NAME_PTR_INFO(N) \
     SSA_NAME_CHECK (N)->ssa_name.ptr_info
@@ -1333,6 +1344,8 @@ struct tree_ssa_name GTY(())
   /* _DECL wrapped by this SSA name.  */
   tree var;
 
+  tree equiv;
+
   /* SSA version number.  */
   unsigned int version;