* web.c (web_main): Do not set DF_RD_PRUNE_DEAD_DEFS flag.

From-SVN: r192413

gcc/ChangeLog

+2012-10-12  Jan Hubicka <jh@suse.cz>
+
+	* web.c (web_main): Do not set DF_RD_PRUNE_DEAD_DEFS flag.
+
 2012-10-12  Aaron Gray <aaronngray.lists@gmail.com>
 	    Diego Novillo <dnovillo@google.com>
 

gcc/testsuite/ChangeLog

+2012-10-12  Jan Hubicka <jh@suse.cz>
+
+	* gcc.dg/webizer.c: New testcase.
+
 2012-10-12  Janis Johnson  <janisjo@codesourcery.com>
 
 	* gcc.dg/vect/pr48765.c: Skip for conflicting options, don't

gcc/testsuite/gcc.dg/webizer.c

+/* { dg-do run } */
+/* { dg-options "-O3 -funroll-loops" } */
+typedef struct rowbox {
+    int startx ;
+    int endx ;
+    int endx1 ;
+    int startx2 ;
+    int ypos ;
+    int desiredL ;
+} ROWBOX ;
+ROWBOX rowArray1[2] ;
+ROWBOX *rowArray = rowArray1;
+
+int numRows = 2;
+
+int row = 1;
+int block = 0;
+double ckt_size_factor ;
+
+__attribute__ ((noinline))
+configure2()
+{
+  block = 0 ;
+  for( row = 1 ; row <= numRows ; row++ ) {
+      block++ ;
+    if( rowArray[row].endx1 > 0 ) {
+      block++ ;
+    }
+  }
+}
+
+main()
+{
+  configure2();
+}

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);