ssa-ccp.c (ssa_fast_dce): Update the DF def-use chains after completing fast dead code elimination.

        * ssa-ccp.c (ssa_fast_dce): Update the DF def-use chains
        after completing fast dead code elimination.

From-SVN: r50374

gcc/ChangeLog

@@ -8,6 +8,9 @@ Wed Mar  6 20:32:09 CET 2002  Jan Hubicka  <jh@suse.cz>
 
 Wed Mar  6 12:27:10 2002  Jeffrey A Law  (law@redhat.com)
 
+	* ssa-ccp.c (ssa_fast_dce): Update the DF def-use chains
+	after completing fast dead code elimination.
+
 	* m68k.h (CONST_COSTS): Lower cost of 0.0 when used inside a
 	COMPARE operator.
 	

gcc/ssa-ccp.c

@@ -1218,4 +1218,9 @@ ssa_fast_dce (df)
     }
 
   sbitmap_free (worklist);
+
+  /* Update the use-def chains in the df_analyzer as needed.  */
+  df_analyse (df_analyzer, 0,
+              DF_RD_CHAIN | DF_RU_CHAIN | DF_REG_INFO | DF_HARD_REGS);
+
 }