1 files changed, 2 insertions, 1 deletions
diff --git a/gcc/web.c b/gcc/web.c
index f60b4b6a..74904d2 100644
--- a/gcc/web.c
+++ b/gcc/web.c
@@ -313,7 +313,8 @@ web_main (void)
   rtx insn;
 
   df_set_flags (DF_NO_HARD_REGS + DF_EQ_NOTES);
-  df_set_flags (DF_RD_PRUNE_DEAD_DEFS);
+  /* We can not RD_PRUNE_DEAD_DEFS, because we care about REG_EQUAL
+     notes.  */
   df_chain_add_problem (DF_UD_CHAIN);
   df_analyze ();
   df_set_flags (DF_DEFER_INSN_RESCAN);