From dcef445e694c6e2b65d7f1fd0462f4ceacdaff3c Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Tue, 14 Jun 2016 11:43:06 +0200
Subject: api: add nan checking function

---
 opentrack/CMakeLists.txt |  3 +++
 opentrack/nan.cpp        | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 opentrack/nan.cpp

(limited to 'opentrack')

diff --git a/opentrack/CMakeLists.txt b/opentrack/CMakeLists.txt
index 7763178d..dd90bda6 100644
--- a/opentrack/CMakeLists.txt
+++ b/opentrack/CMakeLists.txt
@@ -5,3 +5,6 @@ if(NOT WIN32)
 else()
     target_link_libraries(opentrack-api winmm)
 endif()
+if(CMAKE_COMPILER_IS_GNUCXX)
+    set_source_files_properties(nan.cpp PROPERTIES COMPILE_FLAGS "-fno-fast-math -fno-finite-math-only -fno-fast-math -O2")
+endif()
diff --git a/opentrack/nan.cpp b/opentrack/nan.cpp
new file mode 100644
index 00000000..2522ba38
--- /dev/null
+++ b/opentrack/nan.cpp
@@ -0,0 +1,16 @@
+#include <cmath>
+
+#if defined(__GNUC__)
+bool __attribute__ ((noinline)) nanp(double value)
+#elif defined(_WIN32)
+__declspec(noinline) bool nanp(double value)
+#else
+bool nanp(double value)
+#endif
+{
+    using std::isnan;
+    using std::isinf;
+
+    const volatile double x = value;
+    return isnan(x) || isinf(x);
+}
\ No newline at end of file
-- 
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