[PATCH] [COMPILER-RT] Implement __addtf3 and __subtf3

[Dmitri Gribenko]

  Please just hardcode the expected results and compare them by using *integer* operations (or other runtime functions, if we have suitable ones).


================
Comment at: test/builtins/Unit/addtf3_test.c:43-44
@@ +42,4 @@
+#if defined(__SIZEOF_INT128__) && __SIZEOF_INT128__ == 16
+    // Since NaN can't be compared with NaN, we don't test the
+    // cases that produce NaN result
+
----------------
It can be.  Just compare the binary representation.


http://llvm-reviews.chandlerc.com/D2798