(expand_divmod): Don't make REG_NOTE if last insn's destination isn't

QUOTIENT.

From-SVN: r7798

gcc/expmed.c

@@ -2568,7 +2568,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
   rtx quotient = 0, remainder = 0;
   rtx last;
   int size;
-  rtx insn;
+  rtx insn, set;
   optab optab1, optab2;
   int op1_is_constant, op1_is_pow2;
 
@@ -2813,6 +2813,9 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
 		  }
 
 		insn = get_last_insn ();
+		if (insn != last
+		    && (set = single_set (insn)) != 0
+		    && SET_DEST (set) == quotient)
 		  REG_NOTES (insn)
 		    = gen_rtx (EXPR_LIST, REG_EQUAL,
 			       gen_rtx (UDIV, compute_mode, op0, op1),
@@ -2878,6 +2881,9 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
 		    if (d < 0)
 		      {
 			insn = get_last_insn ();
+			if (insn != last
+			    && (set = single_set (insn)) != 0
+			    && SET_DEST (set) == quotient)
 			  REG_NOTES (insn)
 			    = gen_rtx (EXPR_LIST, REG_EQUAL,
 				       gen_rtx (DIV, compute_mode, op0,
@@ -2935,15 +2941,15 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
 		      }
 		  }
 
-		if (quotient != 0)
-		  {
 		insn = get_last_insn ();
+		if (insn != last
+		    && (set = single_set (insn)) != 0
+		    && SET_DEST (set) == quotient)
 		  REG_NOTES (insn)
 		    = gen_rtx (EXPR_LIST, REG_EQUAL,
 			       gen_rtx (DIV, compute_mode, op0, op1),
 			       REG_NOTES (insn));
 	      }
-	      }
 	    break;
 	  }
       fail1: