Index: bindings/ocaml/transforms/ipo/ipo_ocaml.c
===================================================================
--- bindings/ocaml/transforms/ipo/ipo_ocaml.c
+++ bindings/ocaml/transforms/ipo/ipo_ocaml.c
@@ -15,9 +15,14 @@
 |*                                                                            *|
 \*===----------------------------------------------------------------------===*/
 
-#include "llvm-c/Transforms/IPO.h"
-#include "caml/mlvalues.h"
+#include "caml/alloc.h"
+#include "caml/callback.h"
+#include "caml/memory.h"
 #include "caml/misc.h"
+#include "caml/mlvalues.h"
+#include "llvm-c/Core.h"
+#include "llvm-c/Transforms/IPO.h"
+#include <assert.h>
 
 /* [`Module] Llvm.PassManager.t -> unit */
 CAMLprim value llvm_add_argument_promotion(LLVMPassManagerRef PM) {
@@ -91,6 +96,33 @@
   return Val_unit;
 }
 
+/* string -> bool */
+static value *predicate_f = NULL;
+
+LLVMBool MustPreserveCallBack(LLVMValueRef Val, void *Ctx) {
+  CAMLparam0();
+  CAMLlocal1(LLVMValName);
+  const char *llvmValName;
+  LLVMBool ret;
+  assert(predicate_f != NULL &&
+         "llvm_add_internalize_predicate must be called with \
+             LLVMInternalizePredicateCallback symbol set");
+
+  llvmValName = LLVMGetValueName(Val);
+  LLVMValName = caml_copy_string(llvmValName);
+  ret = Bool_val(caml_callback(*predicate_f, LLVMValName));
+
+  CAMLreturnT(LLVMBool, ret);
+}
+
+/* [`Module] Llvm.PassManager.t -> unit */
+CAMLprim value llvm_add_internalize_predicate(LLVMPassManagerRef PM) {
+  predicate_f = caml_named_value("LLVMInternalizePredicateCallback");
+  LLVMAddInternalizePassWithMustPreservePredicate(PM, NULL,
+                                                  &MustPreserveCallBack);
+  return Val_unit;
+}
+
 /* [`Module] Llvm.PassManager.t -> unit */
 CAMLprim value llvm_add_strip_dead_prototypes(LLVMPassManagerRef PM) {
   LLVMAddStripDeadPrototypesPass(PM);
Index: bindings/ocaml/transforms/ipo/llvm_ipo.ml
===================================================================
--- bindings/ocaml/transforms/ipo/llvm_ipo.ml
+++ bindings/ocaml/transforms/ipo/llvm_ipo.ml
@@ -42,6 +42,17 @@
 external add_internalize
   : [ `Module ] Llvm.PassManager.t -> all_but_main:bool -> unit
   = "llvm_add_internalize"
+
+external add_internalize_predicate_raw
+  : [ `Module ] Llvm.PassManager.t -> unit
+  = "llvm_add_internalize_predicate"
+
+let add_internalize_predicate
+  : [ `Module ] Llvm.PassManager.t -> (string -> bool) -> unit =
+  fun pm predicate ->
+    Callback.register "LLVMInternalizePredicateCallback" predicate;
+    add_internalize_predicate_raw pm
+
 external add_strip_dead_prototypes
   : [ `Module ] Llvm.PassManager.t -> unit
   = "llvm_add_strip_dead_prototypes"
Index: bindings/ocaml/transforms/ipo/llvm_ipo.mli
===================================================================
--- bindings/ocaml/transforms/ipo/llvm_ipo.mli
+++ bindings/ocaml/transforms/ipo/llvm_ipo.mli
@@ -71,6 +71,12 @@
   : [ `Module ] Llvm.PassManager.t -> all_but_main:bool -> unit
   = "llvm_add_internalize"
 
+(** See the [llvm::createInternalizePass] function.
+    If predicate returns [true], that symbol is preserved.
+    NOT THREAD SAFE! *)
+val add_internalize_predicate
+  : [ `Module ] Llvm.PassManager.t -> (string -> bool) -> unit
+
 (** See the [llvm::createStripDeadPrototypesPass] function. *)
 external add_strip_dead_prototypes
   : [ `Module ] Llvm.PassManager.t -> unit