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| author | Rémi Verschelde <rverschelde@gmail.com> | 2017-09-20 14:29:01 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-09-20 14:29:01 +0200 |
| commit | e3617cb18771232876b1318639adb7dc9c5f452b (patch) | |
| tree | 173ec50ab11a32975bde882963eebf28799fc1e1 | |
| parent | 372cdc20705dab7c2227b89d8bc4d425ffd3e8a4 (diff) | |
| parent | 7744bb153f222c0343d587e5cb11cf6f19172634 (diff) | |
Merge pull request #11409 from MarufSarker/PR-core-math-is_nan
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 |