Moved math functions to be constexpr.

bkaradzic · Nov 28, 2024 · 7eace05 · 7eace05
1 parent c8ff296
commit 7eace05
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Showing 8 changed files with 336 additions and 318 deletions.
diff --git a/include/bx/bx.h b/include/bx/bx.h
@@ -216,6 +216,9 @@ namespace bx
 	template<typename Ty>
 	constexpr bool isPowerOf2(Ty _a);
 
+	/// Returns true if it's evaluated as constexpr.
+	constexpr bool isConstantEvaluated();
+
 	/// Returns a value of type `Ty` by reinterpreting the object representation of `FromT`.
 	template <typename Ty, typename FromT>
 	constexpr Ty bitCast(const FromT& _from);

diff --git a/include/bx/constants.h b/include/bx/constants.h
@@ -42,10 +42,7 @@ namespace bx
 	constexpr float    kInvLogNat2     = 1.4426950408889634073599246810019f;
 
 	/// The natural logarithm of the 2. ln(2)
-	constexpr float    kLogNat2Hi      = 0.6931471805599453094172321214582f;
-
-	///
-	constexpr float    kLogNat2Lo      = 1.90821492927058770002e-10f;
+	constexpr float    kLogNat2        = 0.6931471805599453094172321214582f;
 
 	/// The base of natural logarithms. e(1)
 	constexpr float    kE              = 2.7182818284590452353602874713527f;
@@ -83,7 +80,7 @@ namespace bx
 	/// Maximum representable floating-point number.
 	constexpr float    kFloatLargest   = 3.402823466e+38f;
 
-	///
+	/// Floating-point infinity.
 //	constexpr float    kFloatInfinity;
 
 	///
@@ -104,7 +101,7 @@ namespace bx
 	/// Largest representable double-precision floating-point number.
 	constexpr double   kDoubleLargest  = 1.7976931348623158e+308;
 
-	//
+	// Double-precision floating-point infinity.
 //	constexpr double   kDoubleInfinity;
 
 } // namespace bx

diff --git a/include/bx/inline/bx.inl b/include/bx/inline/bx.inl
@@ -147,6 +147,11 @@ namespace bx
 		return _a && !(_a & (_a - 1) );
 	}
 
+	constexpr bool isConstantEvaluated()
+	{
+		return __builtin_is_constant_evaluated();
+	}
+
 	template <typename Ty, typename FromT>
 	inline constexpr Ty bitCast(const FromT& _from)
 	{