re PR rtl-optimization/45051 (gcc.c-torture/execute/builtins/abs-2.c and abs-3.c…

re PR rtl-optimization/45051 (gcc.c-torture/execute/builtins/abs-2.c and abs-3.c due to "track subwords of DImode allocnos")

	PR rtl-optimization/45051
	* reload1.c (delete_output_reload): Use refers_to_regno_p rather
	than reg_mentioned_p.

From-SVN: r162558

gcc/ChangeLog

@@ -3,6 +3,10 @@
 	* postreload.c (reload_combine_recognize_const_pattern): Move test
 	for limiting the insn movement to the right scope.
 
+	PR rtl-optimization/45051
+	* reload1.c (delete_output_reload): Use refers_to_regno_p rather
+	than reg_mentioned_p.
+
 2010-07-26  Richard Henderson  <rth@redhat.com>
 
 	PR target/44132

gcc/reload1.c

@@ -8813,6 +8813,8 @@ delete_output_reload (rtx insn, int j, int last_reload_reg, rtx new_reload_reg)
   int n_inherited = 0;
   rtx i1;
   rtx substed;
+  unsigned regno;
+  int nregs;
 
   /* It is possible that this reload has been only used to set another reload
      we eliminated earlier and thus deleted this instruction too.  */
@@ -8864,6 +8866,12 @@ delete_output_reload (rtx insn, int j, int last_reload_reg, rtx new_reload_reg)
   if (n_occurrences > n_inherited)
     return;
 
+  regno = REGNO (reg);
+  if (regno >= FIRST_PSEUDO_REGISTER)
+    nregs = 1;
+  else
+    nregs = hard_regno_nregs[regno][GET_MODE (reg)];
+
   /* If the pseudo-reg we are reloading is no longer referenced
      anywhere between the store into it and here,
      and we're within the same basic block, then the value can only
@@ -8875,7 +8883,7 @@ delete_output_reload (rtx insn, int j, int last_reload_reg, rtx new_reload_reg)
       if (NOTE_INSN_BASIC_BLOCK_P (i1))
 	return;
       if ((NONJUMP_INSN_P (i1) || CALL_P (i1))
-	  && reg_mentioned_p (reg, PATTERN (i1)))
+	  && refers_to_regno_p (regno, regno + nregs, PATTERN (i1), NULL))
 	{
 	  /* If this is USE in front of INSN, we only have to check that
 	     there are no more references than accounted for by inheritance.  */