maths: remove const/pure attributes
const/pure attributes are causing inconsitencies for various functions. it's safer to just not use them until there's a more thorough investigation of their impact.
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maths.hpp
74
maths.hpp
@ -17,8 +17,9 @@
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#ifndef __MATHS_HPP
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#define __MATHS_HPP
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#include "debug.hpp"
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#include "types/traits.hpp"
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#include "./debug.hpp"
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#include "./types/traits.hpp"
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#include "./float.hpp"
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#include <cmath>
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#include <cstdint>
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@ -27,6 +28,13 @@
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#include <utility>
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///////////////////////////////////////////////////////////////////////////////
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// NOTE: You may be tempted to add all sorts of performance enhancing
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// attributes (like gnu::const or gnu::pure). DO NOT DO THIS WITHOUT EXTENSIVE
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// TESTING. Just about everything will break in some way with these attributes.
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//
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// In particular: it is safest to apply these only to leaf functions
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///////////////////////////////////////////////////////////////////////////////
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namespace util {
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@ -45,8 +53,10 @@ namespace util {
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namespace util {
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template <typename T>
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constexpr T
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pow2 [[gnu::const]] (T value)
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{ return value * value; }
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pow2 [[gnu::const]] (T value)
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{
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return value * value;
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}
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}
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//-----------------------------------------------------------------------------
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@ -60,26 +70,26 @@ namespace util {
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//-----------------------------------------------------------------------------
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template <typename T>
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bool
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is_pow2 [[gnu::const]] (T value);
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is_pow2 (T value);
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//-----------------------------------------------------------------------------
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// Logarithms
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template <typename T>
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T
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log2 [[gnu::const]] (T val);
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log2 (T val);
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template <typename T>
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T
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log2up [[gnu::const]] (T val);
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log2up (T val);
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//-----------------------------------------------------------------------------
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// Roots
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template <typename T>
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double
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rootsquare [[gnu::const]] (T a, T b);
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rootsquare (T a, T b);
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//-----------------------------------------------------------------------------
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@ -90,7 +100,7 @@ typename std::common_type<
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std::enable_if_t<std::is_integral<T>::value,T>,
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std::enable_if_t<std::is_integral<U>::value,U>
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>::type
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round_to [[gnu::const]] (T value, U size)
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round_to (T value, U size)
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{
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if (value % size == 0)
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return value;
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@ -101,12 +111,12 @@ round_to [[gnu::const]] (T value, U size)
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template <typename T>
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T
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round_pow2 [[gnu::const]] (T value);
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round_pow2 (T value);
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template <typename T, typename U>
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constexpr T
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divup [[gnu::const]] (const T a, const U b)
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divup (const T a, const U b)
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{ return (a + b - 1) / b; }
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@ -114,14 +124,14 @@ divup [[gnu::const]] (const T a, const U b)
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// Classification
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template <typename T>
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bool
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is_integer [[gnu::const]] (const T& value);
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is_integer (const T& value);
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//-----------------------------------------------------------------------------
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// Properties
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template <typename T>
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unsigned
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digits [[gnu::const]] (const T& value);
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digits (const T& value);
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//-----------------------------------------------------------------------------
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@ -248,7 +258,7 @@ constexpr T E = T(2.71828182845904523536028747135266250);
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template <typename T>
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constexpr T
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to_degrees [[gnu::const]] (T radians)
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to_degrees (T radians)
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{
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static_assert (std::is_floating_point<T>::value, "undefined for integral types");
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return radians * 180 / PI<T>;
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@ -257,7 +267,7 @@ to_degrees [[gnu::const]] (T radians)
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template <typename T>
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constexpr T
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to_radians [[gnu::const]] (T degrees)
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to_radians (T degrees)
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{
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static_assert (std::is_floating_point<T>::value, "undefined for integral types");
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return degrees / 180 * PI<T>;
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@ -267,7 +277,7 @@ to_radians [[gnu::const]] (T degrees)
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//! Normalised sinc function
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template <typename T>
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constexpr T
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sincn [[gnu::const]] (T x)
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sincn (T x)
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{
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return almost_zero (x) ? 1 : std::sin (PI<T> * x) / (PI<T> * x);
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}
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@ -276,7 +286,7 @@ sincn [[gnu::const]] (T x)
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//! Unnormalised sinc function
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template <typename T>
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constexpr T
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sincu [[gnu::const]] (T x)
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sincu (T x)
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{
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return almost_zero (x) ? 1 : std::sin (x) / x;
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}
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@ -284,7 +294,7 @@ sincu [[gnu::const]] (T x)
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//-----------------------------------------------------------------------------
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constexpr uintmax_t
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factorial [[gnu::const]] (unsigned i)
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factorial (unsigned i)
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{
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return i <= 1 ? 0 : i * factorial (i - 1);
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}
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@ -292,7 +302,7 @@ factorial [[gnu::const]] (unsigned i)
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/// stirlings approximation of factorials
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constexpr uintmax_t
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stirling [[gnu::const]] (unsigned n)
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stirling (unsigned n)
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{
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return static_cast<uintmax_t> (
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std::sqrt (2 * PI<float> * n) * std::pow (n / E<float>, n)
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@ -301,7 +311,7 @@ stirling [[gnu::const]] (unsigned n)
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constexpr uintmax_t
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combination [[gnu::const]] (unsigned n, unsigned k)
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combination (unsigned n, unsigned k)
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{
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return factorial (n) / (factorial (k) / (factorial (n - k)));
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}
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@ -337,7 +347,7 @@ fsum (InputIt first, InputIt last)
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namespace util {
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template <typename T>
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constexpr T
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min [[gnu::const]] (const T a)
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min (const T a)
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{ return a; }
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@ -347,7 +357,7 @@ namespace util {
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std::is_integral<typename std::decay<T>::type>::value == std::is_integral<typename std::decay<U>::type>::value,
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typename std::common_type<T,U>::type
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>::type
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min [[gnu::const]] (const T a, const U b, Args ...args)
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min (const T a, const U b, Args ...args)
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{
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return min (a < b ? a : b, std::forward<Args> (args)...);
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}
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@ -357,7 +367,7 @@ namespace util {
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/// Variadic maximum
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template <typename T>
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constexpr T
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max [[gnu::const]] (const T a)
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max (const T a)
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{ return a; }
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@ -367,7 +377,7 @@ namespace util {
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std::is_integral<typename std::decay<T>::type>::value == std::is_integral<typename std::decay<U>::type>::value,
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typename std::common_type<T,U>::type
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>::type
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max [[gnu::const]] (const T a, const U b, Args ...args)
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max (const T a, const U b, Args ...args)
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{
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return max (a > b ? a : b, std::forward<Args> (args)...);
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}
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@ -379,7 +389,7 @@ namespace util {
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// min/max clamping
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template <typename T, typename U, typename V>
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constexpr T
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limit [[gnu::const]] (const T val, const U lo, const V hi)
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limit (const T val, const U lo, const V hi)
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{
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lo <= hi ? (void)0 : panic ();
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@ -392,7 +402,7 @@ limit [[gnu::const]] (const T val, const U lo, const V hi)
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// clamped cubic hermite interpolation
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template <typename T>
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T
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smoothstep [[gnu::const]] (T a, T b, T x)
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smoothstep (T a, T b, T x)
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{
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CHECK_LE(a, b);
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x = limit ((x - a) / (b - a), T{0}, T{1});
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@ -411,7 +421,7 @@ constexpr
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typename std::enable_if<
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!std::is_floating_point<T>::value && std::is_floating_point<U>::value, U
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>::type
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renormalise [[gnu::const]] (T t)
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renormalise (T t)
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{
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return t / static_cast<U> (std::numeric_limits<T>::max ());
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}
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@ -423,7 +433,7 @@ constexpr
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typename std::enable_if<
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std::is_floating_point<T>::value && !std::is_floating_point<U>::value, U
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>::type
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renormalise [[gnu::const]] (T t)
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renormalise (T t)
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{
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// Ideally std::ldexp would be involved but it complicates handing
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// integers with greater precision than our floating point type. Also it
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@ -458,7 +468,7 @@ typename std::enable_if<
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std::is_floating_point<U>::value &&
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!std::is_same<T,U>::value, U
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>::type
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renormalise [[gnu::const]] (T t)
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renormalise (T t)
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{
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return static_cast<U> (t);
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}
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@ -472,7 +482,7 @@ typename std::enable_if<
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std::is_integral<U>::value &&
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(sizeof (T) > sizeof (U)), U
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>::type
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renormalise [[gnu::const]] (T t)
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renormalise (T t)
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{
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static_assert (sizeof (T) > sizeof (U),
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"assumes right shift is sufficient");
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@ -491,7 +501,7 @@ typename std::enable_if<
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std::is_integral<U>::value &&
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sizeof (T) < sizeof (U), U
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>::type
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renormalise [[gnu::const]] (T t)
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renormalise (T t)
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{
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static_assert (sizeof (T) < sizeof (U),
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"assumes bit creation is required to fill space");
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@ -518,7 +528,7 @@ constexpr
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typename std::enable_if<
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std::is_same<T,U>::value, U
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>::type
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renormalise [[gnu::const]] (T t)
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renormalise (T t)
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{ return t; }
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#include "maths.ipp"
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