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Telegram/lib_crl/crl/winapi/crl_winapi_fp_exceptions.cpp

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#include <crl/crl_time.h>
+
+#ifdef CRL_USE_WINAPI_TIME
+
+#ifdef CRL_THROW_FP_EXCEPTIONS
+
+#include <float.h>
+#pragma fenv_access (on)
+
+namespace crl {
+
+void toggle_fp_exceptions(bool throwing) {
+	// Allow throwing (and reporting) floating point exceptions.
+	//
+	// Otherwise x86 build behaves unpredictably on old hardware,
+	// after an fp-error it may fail some benign operations, like
+	// std::round(1.) giving 'nan' or double -> int64 giving int64_min.
+	//
+	// This results in unexpected assertion violations.
+	auto state = (unsigned int)0;
+
+    // Right now catch only division by zero and invalid operations.
+    const auto bits = (throwing ? 0 : (_EM_ZERODIVIDE | _EM_INVALID))
+        | _EM_DENORMAL | _EM_INEXACT | _EM_UNDERFLOW | _EM_OVERFLOW;
+	_controlfp_s(&state, bits, _MCW_EM);
+}
+
+} // namespace crl
+
+#else // CRL_THROW_FP_EXCEPTIONS
+
+namespace crl {
+
+void toggle_fp_exceptions(bool throwing) {
+}
+
+} // namespace crl
+
+#endif // CRL_THROW_FP_EXCEPTIONS
+
+#endif // CRL_USE_WINAPI_TIME