Modulo-scheduling improvements. Patch 2 of 2

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@127848 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 7 insertions, 3 deletions

diff --git a/gcc/ddg.c b/gcc/ddg.c
index 295811db4c1..f1ec8fdb121 100644
--- a/gcc/ddg.c
+++ b/gcc/ddg.c
@@ -176,13 +176,17 @@ create_ddg_dep_from_intra_loop_link (ddg_ptr g, ddg_node_ptr src_node,
       rtx set;
 
       set = single_set (dest_node->insn);
-      if (set)
+      /* TODO: Handle registers that REG_P is not true for them, i.e.
+         subregs and special registers.  */
+      if (set && REG_P (SET_DEST (set)))
         {
           int regno = REGNO (SET_DEST (set));
-          struct df_ref *first_def =
-            df_bb_regno_first_def_find (g->bb, regno);
+          struct df_ref *first_def;
           struct df_rd_bb_info *bb_info = DF_RD_BB_INFO (g->bb);
 
+          first_def = df_bb_regno_first_def_find (g->bb, regno);
+          gcc_assert (first_def);
+
           if (bitmap_bit_p (bb_info->gen, first_def->id))
             return;
         }