diff --git i/vm/llvm/jit_operations.hpp w/vm/llvm/jit_operations.hpp
index f55a771..aa15021 100644
--- i/vm/llvm/jit_operations.hpp
+++ w/vm/llvm/jit_operations.hpp
@@ -293,7 +293,7 @@ namespace rubinius {
     Value* ptrtoint(Value* ptr) {
       return CastInst::Create(
           Instruction::PtrToInt,
-          ptr, Type::Int32Ty, "ptr2int", block_);
+          ptr, IntPtrTy, "ptr2int", block_);
     }
 
     Value* subtract_pointers(Value* ptra, Value* ptrb) {
@@ -302,7 +302,7 @@ namespace rubinius {
 
       Value* sub = BinaryOperator::CreateSub(inta, intb, "ptr_diff", block_);
 
-      Value* size_of = ConstantInt::get(Type::Int32Ty, 4);
+      Value* size_of = ConstantInt::get(IntPtrTy, sizeof(uintptr_t));
 
       return BinaryOperator::CreateSDiv(sub, size_of, "ptr_diff_adj", block_);
     }
diff --git i/vm/llvm/jit_util.cpp w/vm/llvm/jit_util.cpp
index 570d441..c0c2383 100644
--- i/vm/llvm/jit_util.cpp
+++ w/vm/llvm/jit_util.cpp
@@ -645,7 +645,7 @@ extern "C" {
     self->set_table_ivar(state, name, val);
   }
 
-  Object* rbx_continue_uncommon(STATE, CallFrame* call_frame, Arguments& args, int sp) {
+  Object* rbx_continue_uncommon(STATE, CallFrame* call_frame, Arguments& args, native_int sp) {
     LLVMState::get(state)->add_uncommons_taken();
 
     VMMethod* vmm = call_frame->cm->backend_method_;
diff --git i/vm/llvm/jit_visit.hpp w/vm/llvm/jit_visit.hpp
index 6cc69a7..7b33eef 100644
--- i/vm/llvm/jit_visit.hpp
+++ w/vm/llvm/jit_visit.hpp
@@ -1016,7 +1016,7 @@ namespace rubinius {
       sig << "VM";
       sig << "CallFrame";
       sig << "Arguments";
-      sig << Type::Int32Ty;
+      sig << IntPtrTy;
 
       Value* cur = stack_ptr();
 
diff --git i/vm/template/instructions.cpp w/vm/template/instructions.cpp
index 6e6cdb2..4fafd15 100644
--- i/vm/template/instructions.cpp
+++ w/vm/template/instructions.cpp
@@ -236,7 +236,7 @@ exception:
 }
 
 Object* VMMethod::uncommon_interpreter(STATE, VMMethod* const vmm,
-    CallFrame* const call_frame, Arguments& args, int sp)
+    CallFrame* const call_frame, Arguments& args, native_int sp)
 {
 #ruby <<CODE
   impl2 = si.decode_methods
diff --git i/vm/vmmethod.hpp w/vm/vmmethod.hpp
index 83200ec..65c2dff 100644
--- i/vm/vmmethod.hpp
+++ w/vm/vmmethod.hpp
@@ -153,7 +153,7 @@ namespace rubinius {
                                         Arguments& args);
 
     static Object* uncommon_interpreter(STATE, VMMethod* const vmm,
-      CallFrame* const call_frame, Arguments& args, int sp);
+      CallFrame* const call_frame, Arguments& args, native_int sp);
 
     void setup_argument_handler(CompiledMethod* meth);