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diff --git a/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/standard_ao_double_t.h b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/standard_ao_double_t.h
new file mode 100644
index 0000000..7089f05
--- /dev/null
+++ b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/standard_ao_double_t.h
@@ -0,0 +1,27 @@
+/*
+ * NEC LE-IT: For 64-bit OS we extend the double type to hold two int64's
+ *
+ *  x86-64: __m128 serves as placeholder which also requires the compiler
+ *          to align it on 16 byte boundary (as required by cmpxchg16).
+ * Similar things could be done for PowerPC 64-bit using a VMX data type...
+ */
+
+#if (defined(__x86_64__) && __GNUC__ >= 4) || defined(_WIN64)
+# include <xmmintrin.h>
+  typedef __m128 double_ptr_storage;
+#elif defined(_WIN32) && !defined(__GNUC__)
+  typedef unsigned __int64 double_ptr_storage;
+#else
+  typedef unsigned long long double_ptr_storage;
+#endif
+
+# define AO_HAVE_DOUBLE_PTR_STORAGE
+
+typedef union {
+    double_ptr_storage AO_whole;
+    struct {AO_t AO_v1; AO_t AO_v2;} AO_parts;
+} AO_double_t;
+
+#define AO_HAVE_double_t
+#define AO_val1 AO_parts.AO_v1
+#define AO_val2 AO_parts.AO_v2