diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index aa1a8ad09c9..a3602abb810 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2009-09-18  Neil Vachharajani  <nvachhar@google.com>
+
+	* value-prof.c (interesting_stringop_to_profile_p): Added output
+	argument to indicate which parameter is the size parameter.
+	* value-prof.c (gimple_stringop_fixed_value): Use
+	INTERESTING_STRINGOP_TO_PROFILE_P to find size argument.
+	* value-prof.c (gimple_stringops_transform): Update call sites to
+	INTERESTING_STRINGOP_TO_PROFILE_P to reflect parameter change.
+	* testsuite/gcc.dg/tree-prof/val-prof-7.c: Added test case.
+
 2009-09-18  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/38288
diff --git a/gcc/testsuite/gcc.dg/tree-prof/val-prof-7.c b/gcc/testsuite/gcc.dg/tree-prof/val-prof-7.c
new file mode 100644
index 00000000000..bb79c19d1f4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-prof/val-prof-7.c
@@ -0,0 +1,26 @@
+/* { dg-options "-O2 -fdump-tree-tree_profile -mtune=core2" } */
+/* { dg-skip-if "" { ! { i?86-*-* x86_64-*-* } } { "*" } { "" } } */
+
+#include <strings.h>
+
+int foo(int len)
+{
+  char array[1000];
+  bzero(array, len);
+  return 0;
+}
+
+int main() {
+  int i;
+  for (i = 0; i < 1000; i++)
+    {
+      if (i > 990)
+	foo(16);
+      else
+	foo(8);
+    }
+  return 0;
+}
+
+/* { dg-final-use { scan-tree-dump "Single value 8 stringop transformation on bzero" "tree_profile"} } */
+/* { dg-final-use { cleanup-tree-dump "tree_profile" } } */
diff --git a/gcc/value-prof.c b/gcc/value-prof.c
index 9109286587c..12f1ecc5962 100644
--- a/gcc/value-prof.c
+++ b/gcc/value-prof.c
@@ -1241,9 +1241,12 @@ gimple_ic_transform (gimple stmt)
   return true;
 }
 
-/* Return true if the stringop CALL with FNDECL shall be profiled.  */
+/* Return true if the stringop CALL with FNDECL shall be profiled.
+   SIZE_ARG be set to the argument index for the size of the string
+   operation.
+*/
 static bool
-interesting_stringop_to_profile_p (tree fndecl, gimple call)
+interesting_stringop_to_profile_p (tree fndecl, gimple call, int *size_arg)
 {
   enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
 
@@ -1255,12 +1258,15 @@ interesting_stringop_to_profile_p (tree fndecl, gimple call)
     {
      case BUILT_IN_MEMCPY:
      case BUILT_IN_MEMPCPY:
+       *size_arg = 2;
        return validate_gimple_arglist (call, POINTER_TYPE, POINTER_TYPE,
 				       INTEGER_TYPE, VOID_TYPE);
      case BUILT_IN_MEMSET:
+       *size_arg = 2;
        return validate_gimple_arglist (call, POINTER_TYPE, INTEGER_TYPE,
 				      INTEGER_TYPE, VOID_TYPE);
      case BUILT_IN_BZERO:
+       *size_arg = 1;
        return validate_gimple_arglist (call, POINTER_TYPE, INTEGER_TYPE,
 				       VOID_TYPE);
      default:
@@ -1285,11 +1291,17 @@ gimple_stringop_fixed_value (gimple vcall_stmt, tree icall_size, int prob,
   basic_block cond_bb, icall_bb, vcall_bb, join_bb;
   edge e_ci, e_cv, e_iv, e_ij, e_vj;
   gimple_stmt_iterator gsi;
+  tree fndecl;
+  int size_arg;
+
+  fndecl = gimple_call_fndecl (vcall_stmt);
+  if (!interesting_stringop_to_profile_p (fndecl, vcall_stmt, &size_arg))
+    gcc_unreachable();
 
   cond_bb = gimple_bb (vcall_stmt);
   gsi = gsi_for_stmt (vcall_stmt);
 
-  vcall_size = gimple_call_arg (vcall_stmt, 2);
+  vcall_size = gimple_call_arg (vcall_stmt, size_arg);
   optype = TREE_TYPE (vcall_size);
 
   tmpv = create_tmp_var (optype, "PROF");
@@ -1304,7 +1316,7 @@ gimple_stringop_fixed_value (gimple vcall_stmt, tree icall_size, int prob,
   gsi_insert_before (&gsi, cond_stmt, GSI_SAME_STMT);
 
   icall_stmt = gimple_copy (vcall_stmt);
-  gimple_call_set_arg (icall_stmt, 2, icall_size);
+  gimple_call_set_arg (icall_stmt, size_arg, icall_size);
   gsi_insert_before (&gsi, icall_stmt, GSI_SAME_STMT);
 
   /* Fix CFG. */
@@ -1359,6 +1371,7 @@ gimple_stringops_transform (gimple_stmt_iterator *gsi)
   unsigned int dest_align, src_align;
   gcov_type prob;
   tree tree_val;
+  int size_arg;
 
   if (gimple_code (stmt) != GIMPLE_CALL)
     return false;
@@ -1366,13 +1379,10 @@ gimple_stringops_transform (gimple_stmt_iterator *gsi)
   if (!fndecl)
     return false;
   fcode = DECL_FUNCTION_CODE (fndecl);
-  if (!interesting_stringop_to_profile_p (fndecl, stmt))
+  if (!interesting_stringop_to_profile_p (fndecl, stmt, &size_arg))
     return false;
 
-  if (fcode == BUILT_IN_BZERO)
-    blck_size = gimple_call_arg (stmt, 1);
-  else
-    blck_size = gimple_call_arg (stmt, 2);
+  blck_size = gimple_call_arg (stmt, size_arg);
   if (TREE_CODE (blck_size) == INTEGER_CST)
     return false;
 
@@ -1583,6 +1593,7 @@ gimple_stringops_values_to_profile (gimple stmt, histogram_values *values)
   tree blck_size;
   tree dest;
   enum built_in_function fcode;
+  int size_arg;
 
   if (gimple_code (stmt) != GIMPLE_CALL)
     return;
@@ -1591,14 +1602,11 @@ gimple_stringops_values_to_profile (gimple stmt, histogram_values *values)
     return;
   fcode = DECL_FUNCTION_CODE (fndecl);
 
-  if (!interesting_stringop_to_profile_p (fndecl, stmt))
+  if (!interesting_stringop_to_profile_p (fndecl, stmt, &size_arg))
     return;
 
   dest = gimple_call_arg (stmt, 0);
-  if (fcode == BUILT_IN_BZERO)
-    blck_size = gimple_call_arg (stmt, 1);
-  else
-    blck_size = gimple_call_arg (stmt, 2);
+  blck_size = gimple_call_arg (stmt, size_arg);
 
   if (TREE_CODE (blck_size) != INTEGER_CST)
     {