diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4a46d51f06b..390ebfbd0ef 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2009-05-12  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	PR bootstrap/40118
+	* rs6000.c (rs6000_generate_compare): Use op1b instead of
+	shadowing exisiting variable op1.
+
 2009-05-12  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/37197
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 2d34b14f63f..b14eecce7d4 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -12991,13 +12991,13 @@ rs6000_generate_compare (rtx cmp, enum machine_mode mode)
       else if (GET_CODE (op1) == UNSPEC
 	       && XINT (op1, 1) == UNSPEC_SP_TEST)
 	{
-	  rtx op1 = XVECEXP (op1, 0, 0);
+	  rtx op1b = XVECEXP (op1, 0, 0);
 	  comp_mode = CCEQmode;
 	  compare_result = gen_reg_rtx (CCEQmode);
 	  if (TARGET_64BIT)
-	    emit_insn (gen_stack_protect_testdi (compare_result, op0, op1));
+	    emit_insn (gen_stack_protect_testdi (compare_result, op0, op1b));
 	  else
-	    emit_insn (gen_stack_protect_testsi (compare_result, op0, op1));
+	    emit_insn (gen_stack_protect_testsi (compare_result, op0, op1b));
 	}
       else
 	emit_insn (gen_rtx_SET (VOIDmode, compare_result,