diff --git a/misc/karatsuba.cpp b/misc/karatsuba.cpp
index 1a8f3dc..5b18f3d 100644
--- a/misc/karatsuba.cpp
+++ b/misc/karatsuba.cpp
@@ -5,7 +5,7 @@
 #include <stdio.h>
 #include <mcl/fp.hpp>
 #include <cybozu/xorshift.hpp>
-#include "../src/fp_proto.hpp"
+#include "../src/low_func.hpp"
 #ifdef MCL_USE_LLVM
 #include "../src/fp_llvm.hpp"
 #endif
diff --git a/sample/large.cpp b/sample/large.cpp
index 9991bd5..3c83c2c 100644
--- a/sample/large.cpp
+++ b/sample/large.cpp
@@ -5,7 +5,7 @@
 #include <mcl/fp.hpp>
 #include <cybozu/benchmark.hpp>
 #include <sstream>
-#include "../src/fp_proto.hpp"
+#include "../src/low_func.hpp"
 
 typedef mcl::FpT<> Fp;
 
diff --git a/src/fp.cpp b/src/fp.cpp
index 2f5b12d..6c42abb 100644
--- a/src/fp.cpp
+++ b/src/fp.cpp
@@ -4,8 +4,9 @@
 #ifdef MCL_USE_XBYAK
 #include "fp_generator.hpp"
 #endif
-#include "fp_proto.hpp"
+#include "low_func.hpp"
 #ifdef MCL_USE_LLVM
+#include "proto.hpp"
 #include "fp_llvm.hpp"
 #endif
 
diff --git a/src/fp_proto.hpp b/src/low_func.hpp
similarity index 83%
rename from src/fp_proto.hpp
rename to src/low_func.hpp
index 7c755b6..559f25f 100644
--- a/src/fp_proto.hpp
+++ b/src/low_func.hpp
@@ -1,7 +1,7 @@
 #pragma once
 /**
 	@file
-	@brief prototype of asm function
+	@brief generic function for each N
 	@author MITSUNARI Shigeo(@herumi)
 	@license modified new BSD license
 	http://opensource.org/licenses/BSD-3-Clause
@@ -523,68 +523,8 @@ struct Sqr {
 template<size_t N, class Tag>
 const void3u Sqr<N, Tag>::f = Sqr<N, Tag>::func;
 
-
 } } // mcl::fp
 
-#ifdef MCL_USE_LLVM
-
-#define MCL_FP_DEF_FUNC_SUB(n, suf) \
-void mcl_fp_add ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
-void mcl_fp_sub ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
-mcl::fp::Unit mcl_fp_addPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y); \
-mcl::fp::Unit mcl_fp_subPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y); \
-void mcl_fp_mulUnitPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, mcl::fp::Unit y); \
-void mcl_fpDbl_mulPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y); \
-void mcl_fpDbl_sqrPre ## n ## suf(mcl::fp::Unit* y, const mcl::fp::Unit* x); \
-void mcl_fp_mont ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
-void mcl_fp_montRed ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* xy, const mcl::fp::Unit* p); \
-void mcl_fpDbl_add ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
-void mcl_fpDbl_sub ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p);
-
-#define MCL_FP_DEF_FUNC(n) \
-	MCL_FP_DEF_FUNC_SUB(n, L) \
-	MCL_FP_DEF_FUNC_SUB(n, A)
-
-#define MCL_FP_DEF_FUNC_SPECIAL(suf) \
-void mcl_fpDbl_mod_NIST_P192 ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* xy, const mcl::fp::Unit* /* dummy */); \
-void mcl_fp_mulNIST_P192 ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* /* dummy */); \
-void mcl_fp_sqr_NIST_P192 ## suf(mcl::fp::Unit* y, const mcl::fp::Unit* x, const mcl::fp::Unit* /* dummy */); \
-void mcl_fpDbl_mod_NIST_P521 ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* xy, const mcl::fp::Unit* /* dummy */);
-
-extern "C" {
-
-MCL_FP_DEF_FUNC(1)
-MCL_FP_DEF_FUNC(2)
-MCL_FP_DEF_FUNC(3)
-MCL_FP_DEF_FUNC(4)
-MCL_FP_DEF_FUNC(5)
-MCL_FP_DEF_FUNC(6)
-MCL_FP_DEF_FUNC(7)
-MCL_FP_DEF_FUNC(8)
-MCL_FP_DEF_FUNC(9)
-#if CYBOZU_OS_BIT == 32 || MCL_MAX_BIT_SIZE == 768
-MCL_FP_DEF_FUNC(10)
-MCL_FP_DEF_FUNC(11)
-MCL_FP_DEF_FUNC(12)
-#endif
-#if CYBOZU_OS_BIT == 32
-MCL_FP_DEF_FUNC(13)
-MCL_FP_DEF_FUNC(14)
-MCL_FP_DEF_FUNC(15)
-MCL_FP_DEF_FUNC(16)
-MCL_FP_DEF_FUNC(17)
-#endif
-
-MCL_FP_DEF_FUNC_SPECIAL(L)
-MCL_FP_DEF_FUNC_SPECIAL(A)
-
-}
-
-#undef MCL_FP_DEF_FUNC_SUB
-#undef MCL_FP_DEF_FUNC
-
-#endif // MCL_USE_LLVM
-
 #ifdef _WIN32
 	#pragma warning(pop)
 #endif
diff --git a/src/proto.hpp b/src/proto.hpp
new file mode 100644
index 0000000..d161f8e
--- /dev/null
+++ b/src/proto.hpp
@@ -0,0 +1,65 @@
+#pragma once
+/**
+	@file
+	@brief prototype of asm function
+	@author MITSUNARI Shigeo(@herumi)
+	@license modified new BSD license
+	http://opensource.org/licenses/BSD-3-Clause
+*/
+#include <mcl/op.hpp>
+
+#define MCL_FP_DEF_FUNC_SUB(n, suf) \
+void mcl_fp_add ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
+void mcl_fp_sub ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
+mcl::fp::Unit mcl_fp_addPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y); \
+mcl::fp::Unit mcl_fp_subPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y); \
+void mcl_fp_mulUnitPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, mcl::fp::Unit y); \
+void mcl_fpDbl_mulPre ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y); \
+void mcl_fpDbl_sqrPre ## n ## suf(mcl::fp::Unit* y, const mcl::fp::Unit* x); \
+void mcl_fp_mont ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
+void mcl_fp_montRed ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* xy, const mcl::fp::Unit* p); \
+void mcl_fpDbl_add ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p); \
+void mcl_fpDbl_sub ## n ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* p);
+
+#define MCL_FP_DEF_FUNC(n) \
+	MCL_FP_DEF_FUNC_SUB(n, L) \
+	MCL_FP_DEF_FUNC_SUB(n, A)
+
+#define MCL_FP_DEF_FUNC_SPECIAL(suf) \
+void mcl_fpDbl_mod_NIST_P192 ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* xy, const mcl::fp::Unit* /* dummy */); \
+void mcl_fp_mulNIST_P192 ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* x, const mcl::fp::Unit* y, const mcl::fp::Unit* /* dummy */); \
+void mcl_fp_sqr_NIST_P192 ## suf(mcl::fp::Unit* y, const mcl::fp::Unit* x, const mcl::fp::Unit* /* dummy */); \
+void mcl_fpDbl_mod_NIST_P521 ## suf(mcl::fp::Unit* z, const mcl::fp::Unit* xy, const mcl::fp::Unit* /* dummy */);
+
+extern "C" {
+
+MCL_FP_DEF_FUNC(1)
+MCL_FP_DEF_FUNC(2)
+MCL_FP_DEF_FUNC(3)
+MCL_FP_DEF_FUNC(4)
+MCL_FP_DEF_FUNC(5)
+MCL_FP_DEF_FUNC(6)
+MCL_FP_DEF_FUNC(7)
+MCL_FP_DEF_FUNC(8)
+MCL_FP_DEF_FUNC(9)
+#if CYBOZU_OS_BIT == 32 || MCL_MAX_BIT_SIZE == 768
+MCL_FP_DEF_FUNC(10)
+MCL_FP_DEF_FUNC(11)
+MCL_FP_DEF_FUNC(12)
+#endif
+#if CYBOZU_OS_BIT == 32
+MCL_FP_DEF_FUNC(13)
+MCL_FP_DEF_FUNC(14)
+MCL_FP_DEF_FUNC(15)
+MCL_FP_DEF_FUNC(16)
+MCL_FP_DEF_FUNC(17)
+#endif
+
+MCL_FP_DEF_FUNC_SPECIAL(L)
+MCL_FP_DEF_FUNC_SPECIAL(A)
+
+}
+
+#undef MCL_FP_DEF_FUNC_SUB
+#undef MCL_FP_DEF_FUNC
+
diff --git a/test/fp_test.cpp b/test/fp_test.cpp
index e9b9e7b..7674099 100644
--- a/test/fp_test.cpp
+++ b/test/fp_test.cpp
@@ -2,7 +2,8 @@
 #define CYBOZU_TEST_DISABLE_AUTO_RUN
 #include <cybozu/test.hpp>
 #include <mcl/fp.hpp>
-#include "../src/fp_proto.hpp"
+#include "../src/low_func.hpp"
+#include "../src/proto.hpp"
 #include <time.h>
 #include <cybozu/benchmark.hpp>
 #include <cybozu/option.hpp>
diff --git a/test/low_test.cpp b/test/low_test.cpp
index 316aa9d..f5e72a0 100644
--- a/test/low_test.cpp
+++ b/test/low_test.cpp
@@ -4,7 +4,7 @@
 #include <cybozu/test.hpp>
 #include <cybozu/xorshift.hpp>
 #include <cybozu/itoa.hpp>
-#include "../src/fp_proto.hpp"
+#include "../src/low_func.hpp"
 #include <cybozu/benchmark.hpp>
 
 cybozu::XorShift rg;