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| author | ABU MD. MARUF SARKER <maruf.devel@gmail.com> | 2017-09-19 10:09:35 +0600 |
|---|---|---|
| committer | ABU MD. MARUF SARKER <maruf.devel@gmail.com> | 2017-09-20 08:20:08 +0600 |
| commit | 7744bb153f222c0343d587e5cb11cf6f19172634 (patch) | |
| tree | a570d647c0d3dd37a1c8ce43f4cfae35b8ecc7fb | |
| parent | cd2ffdc6725aa6f7a9a4af6fd5abcc4cafae61b4 (diff) | |
verbose and platform specific implementation for is_nan
| -rw-r--r-- | core/math/math_funcs.h | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/core/math/math_funcs.h b/core/math/math_funcs.h index 9651e37f3e..d63da322a5 100644 --- a/core/math/math_funcs.h +++ b/core/math/math_funcs.h @@ -104,8 +104,44 @@ public: static _ALWAYS_INLINE_ double exp(double p_x) { return ::exp(p_x); } static _ALWAYS_INLINE_ float exp(float p_x) { return ::expf(p_x); } - static _ALWAYS_INLINE_ bool is_nan(double p_val) { return (p_val != p_val); } - static _ALWAYS_INLINE_ bool is_nan(float p_val) { return (p_val != p_val); } + static _ALWAYS_INLINE_ bool is_nan(double p_val) { +#ifdef _MSC_VER + return _isnan(p_val); +#elif defined(__GNUC__) && __GNUC__ < 6 + union { + uint64_t u; + double f; + } ieee754; + ieee754.f = p_val; + // (unsigned)(0x7ff0000000000001 >> 32) : 0x7ff00000 + return ((((unsigned)(ieee754.u >> 32) & 0x7fffffff) + ((unsigned)ieee754.u != 0)) > 0x7ff00000); +#else + return isnan(p_val); +#endif + } + + static _ALWAYS_INLINE_ bool is_nan(float p_val) { +#ifdef _MSC_VER + return _isnan(p_val); +#elif defined(__GNUC__) && __GNUC__ < 6 + union { + uint32_t u; + float f; + } ieee754; + ieee754.f = p_val; + // ----------------------------------- + // (single-precision floating-point) + // NaN : s111 1111 1xxx xxxx xxxx xxxx xxxx xxxx + // : (> 0x7f800000) + // where, + // s : sign + // x : non-zero number + // ----------------------------------- + return ((ieee754.u & 0x7fffffff) > 0x7f800000); +#else + return isnan(p_val); +#endif + } static _ALWAYS_INLINE_ bool is_inf(double p_val) { #ifdef _MSC_VER |