#include "c99_compat.h"
-#if defined(_MSC_VER)
+/* This is to ensure that we get M_PI, etc. definitions */
+#if defined(_MSC_VER) && !defined(_USE_MATH_DEFINES)
+#error _USE_MATH_DEFINES define required when building with MSVC
+#endif
-#if _MSC_VER < 1400 && !defined(__cplusplus)
-static inline float cosf( float f )
-{
- return (float) cos( (double) f );
-}
-
-static inline float sinf( float f )
-{
- return (float) sin( (double) f );
-}
-
-static inline float ceilf( float f )
-{
- return (float) ceil( (double) f );
-}
-
-static inline float floorf( float f )
-{
- return (float) floor( (double) f );
-}
-
-static inline float powf( float f, float g )
-{
- return (float) pow( (double) f, (double) g );
-}
-
-static inline float sqrtf( float f )
-{
- return (float) sqrt( (double) f );
-}
-
-static inline float fabsf( float f )
-{
- return (float) fabs( (double) f );
-}
-
-static inline float logf( float f )
-{
- return (float) log( (double) f );
-}
+#if !defined(_MSC_VER) && \
+ __STDC_VERSION__ < 199901L && \
+ (!defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600) && \
+ !defined(__cplusplus)
-static inline float frexpf(float x, int *exp)
-{
- return (float) frexp(x, exp);
-}
-
-static inline float ldexpf(float x, int exp)
-{
- return (float) ldexp(x, exp);
-}
-
-static inline float logf(float x)
-{
- return (float) log(x);
-}
-
-static inline float expf(float x)
-{
- return (float) exp(x);
-}
-
-
-#else
-/* Work-around an extra semi-colon in VS 2005 logf definition */
-#ifdef logf
-#undef logf
-#define logf(x) ((float)log((double)(x)))
-#endif /* logf */
-
-#if _MSC_VER < 1800
-#define isfinite(x) _finite((double)(x))
-#define isnan(x) _isnan((double)(x))
-#endif /* _MSC_VER < 1800 */
-#endif /* _MSC_VER < 1400 && !defined(__cplusplus) */
-
-#if _MSC_VER < 1800
-static inline double log2( double x )
-{
- const double invln2 = 1.442695041;
- return log( x ) * invln2;
-}
-
-static inline double
-round(double x)
-{
- return x >= 0.0 ? floor(x + 0.5) : ceil(x - 0.5);
-}
-
-static inline float
-roundf(float x)
-{
- return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f);
-}
-#endif
-
-#ifndef INFINITY
-#define INFINITY (DBL_MAX + DBL_MAX)
-#endif
-
-#ifndef NAN
-#define NAN (INFINITY - INFINITY)
-#endif
-
-#endif /* _MSC_VER */
-
-
-#if __STDC_VERSION__ < 199901L && (!defined(__cplusplus) || defined(_MSC_VER))
static inline long int
lrint(double d)
{
return rounded;
}
+
+static inline float
+exp2f(float f)
+{
+ return powf(2.0f, f);
+}
+
+static inline double
+exp2(double d)
+{
+ return pow(2.0, d);
+}
+
#endif /* C99 */
+/*
+ * signbit() is a macro on Linux. Not available on Windows.
+ */
+#ifndef signbit
+#define signbit(x) ((x) < 0.0f)
+#endif
+
+
+#ifndef M_PI
+#define M_PI (3.14159265358979323846)
+#endif
+
+#ifndef M_E
+#define M_E (2.7182818284590452354)
+#endif
+
+#ifndef M_LOG2E
+#define M_LOG2E (1.4426950408889634074)
+#endif
+
+#ifndef FLT_MAX_EXP
+#define FLT_MAX_EXP 128
+#endif
+
+
+#if defined(fpclassify)
+/* ISO C99 says that fpclassify is a macro. Assume that any implementation
+ * of fpclassify, whether it's in a C99 compiler or not, will be a macro.
+ */
+#elif defined(__cplusplus)
+/* For C++, fpclassify() should be defined in <cmath> */
+#elif defined(_MSC_VER)
+/* Not required on VS2013 and above. Oddly, the fpclassify() function
+ * doesn't exist in such a form on MSVC. This is an implementation using
+ * slightly different lower-level Windows functions.
+ */
+#include <float.h>
+
+static inline enum {FP_NAN, FP_INFINITE, FP_ZERO, FP_SUBNORMAL, FP_NORMAL}
+fpclassify(double x)
+{
+ switch(_fpclass(x)) {
+ case _FPCLASS_SNAN: /* signaling NaN */
+ case _FPCLASS_QNAN: /* quiet NaN */
+ return FP_NAN;
+ case _FPCLASS_NINF: /* negative infinity */
+ case _FPCLASS_PINF: /* positive infinity */
+ return FP_INFINITE;
+ case _FPCLASS_NN: /* negative normal */
+ case _FPCLASS_PN: /* positive normal */
+ return FP_NORMAL;
+ case _FPCLASS_ND: /* negative denormalized */
+ case _FPCLASS_PD: /* positive denormalized */
+ return FP_SUBNORMAL;
+ case _FPCLASS_NZ: /* negative zero */
+ case _FPCLASS_PZ: /* positive zero */
+ return FP_ZERO;
+ default:
+ /* Should never get here; but if we do, this will guarantee
+ * that the pattern is not treated like a number.
+ */
+ return FP_NAN;
+ }
+}
+#else
+#error "Need to include or define an fpclassify function"
+#endif
+
+
+/* Since C++11, the following functions are part of the std namespace. Their C
+ * counteparts should still exist in the global namespace, however cmath
+ * undefines those functions, which in glibc 2.23, are defined as macros rather
+ * than functions as in glibc 2.22.
+ */
+#if __cplusplus >= 201103L && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 23))
+#include <cmath>
+
+using std::fpclassify;
+using std::isfinite;
+using std::isinf;
+using std::isnan;
+using std::isnormal;
+using std::signbit;
+using std::isgreater;
+using std::isgreaterequal;
+using std::isless;
+using std::islessequal;
+using std::islessgreater;
+using std::isunordered;
+#endif
+
+
#endif /* #define _C99_MATH_H_ */
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