emit-rtl.c (gen_rtx_REG): Temporarily turn off automatic sharing of hard registers.

        * emit-rtl.c (gen_rtx_REG): Temporarily turn off automatic
        sharing of hard registers.

        * toplev.c (rest_of_compilation): Remove redundant conditional.

From-SVN: r54672

gcc/ChangeLog

@@ -21,6 +21,11 @@
 
 2002-06-16  Jeff Law <law@redhat.com>
 
+	* emit-rtl.c (gen_rtx_REG): Temporarily turn off automatic
+	sharing of hard registers.
+
+	* toplev.c (rest_of_compilation): Remove redundant conditional.
+
 	* toplev.c (rest_of_compilation): Perform a simpler, less costly
 	cleanup of the CFG when not optimizing.
 

gcc/emit-rtl.c

@@ -533,14 +533,21 @@ gen_rtx_REG (mode, regno)
 	return stack_pointer_rtx;
     }
 
+#if 0
   /* If the per-function register table has been set up, try to re-use
-     an existing entry in that table to avoid useless generation of RTL.  */
+     an existing entry in that table to avoid useless generation of RTL.
+
+     This code is disabled for now until we can fix the various backends
+     which depend on having non-shared hard registers in some cases.   Long
+     term we want to re-enable this code as it can significantly cut down
+     on the amount of useless RTL that gets generated.  */
   if (cfun
       && cfun->emit
       && regno_reg_rtx
       && regno < FIRST_PSEUDO_REGISTER
       && reg_raw_mode[regno] == mode)
     return regno_reg_rtx[regno];
+#endif
 
   return gen_raw_REG (mode, regno);
 }

gcc/toplev.c

@@ -2779,9 +2779,8 @@ rest_of_compilation (decl)
 	{
 	  timevar_push (TV_JUMP);
 
-	  if (flag_delete_null_pointer_checks)
-	    if (delete_null_pointer_checks (insns))
-	      cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
+	  if (delete_null_pointer_checks (insns))
+	    cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
 	  timevar_pop (TV_JUMP);
 	}