+/* Support non-nearest rounding mode. */
+#define WANT_ROUNDING 1
+/* Support signaling NaNs. */
+#define WANT_SNAN 0
+
+#if WANT_SNAN
+#error SNaN is unsupported
+#else
+#define issignalingf_inline(x) 0
+#define issignaling_inline(x) 0
+#endif
+
+#ifndef TOINT_INTRINSICS
+#define TOINT_INTRINSICS 0
+#endif
+
+#if TOINT_INTRINSICS
+/* Round x to nearest int in all rounding modes, ties have to be rounded
+ consistently with converttoint so the results match. If the result
+ would be outside of [-2^31, 2^31-1] then the semantics is unspecified. */
+static double_t roundtoint(double_t);
+
+/* Convert x to nearest int in all rounding modes, ties have to be rounded
+ consistently with roundtoint. If the result is not representible in an
+ int32_t then the semantics is unspecified. */
+static int32_t converttoint(double_t);
+#endif
+
+/* Helps static branch prediction so hot path can be better optimized. */
+#ifdef __GNUC__
+#define predict_true(x) __builtin_expect(!!(x), 1)
+#define predict_false(x) __builtin_expect(x, 0)
+#else
+#define predict_true(x) (x)
+#define predict_false(x) (x)
+#endif
+
+/* Evaluate an expression as the specified type. With standard excess
+ precision handling a type cast or assignment is enough (with
+ -ffloat-store an assignment is required, in old compilers argument
+ passing and return statement may not drop excess precision). */
+
+static inline float eval_as_float(float x)
+{
+ float y = x;
+ return y;
+}
+
+static inline double eval_as_double(double x)
+{
+ double y = x;
+ return y;
+}
+
+/* fp_barrier returns its input, but limits code transformations
+ as if it had a side-effect (e.g. observable io) and returned
+ an arbitrary value. */
+
+#ifndef fp_barrierf
+#define fp_barrierf fp_barrierf
+static inline float fp_barrierf(float x)
+{
+ volatile float y = x;
+ return y;
+}
+#endif
+
+#ifndef fp_barrier
+#define fp_barrier fp_barrier
+static inline double fp_barrier(double x)
+{
+ volatile double y = x;
+ return y;
+}
+#endif
+
+#ifndef fp_barrierl
+#define fp_barrierl fp_barrierl
+static inline long double fp_barrierl(long double x)
+{
+ volatile long double y = x;
+ return y;
+}
+#endif
+
+/* fp_force_eval ensures that the input value is computed when that's
+ otherwise unused. To prevent the constant folding of the input
+ expression, an additional fp_barrier may be needed or a compilation
+ mode that does so (e.g. -frounding-math in gcc). Then it can be
+ used to evaluate an expression for its fenv side-effects only. */
+
+#ifndef fp_force_evalf
+#define fp_force_evalf fp_force_evalf
+static inline void fp_force_evalf(float x)
+{
+ volatile float y;
+ y = x;
+}
+#endif
+
+#ifndef fp_force_eval
+#define fp_force_eval fp_force_eval
+static inline void fp_force_eval(double x)
+{
+ volatile double y;
+ y = x;
+}
+#endif
+
+#ifndef fp_force_evall
+#define fp_force_evall fp_force_evall
+static inline void fp_force_evall(long double x)
+{
+ volatile long double y;
+ y = x;
+}
+#endif
+
+#define FORCE_EVAL(x) do { \
+ if (sizeof(x) == sizeof(float)) { \
+ fp_force_evalf(x); \
+ } else if (sizeof(x) == sizeof(double)) { \
+ fp_force_eval(x); \
+ } else { \
+ fp_force_evall(x); \
+ } \