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bitwise: add pure annotation to rotate functions

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This commit is contained in:
Danny Robson 2016-06-20 17:59:21 +10:00
parent fa8933673f
commit b49d95eaf3
1 changed files with 6 additions and 10 deletions
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16
bitwise.hpp
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@ -31,25 +31,21 @@ const uint8_t BITMASK_7BITS = 0x7F;
const uint8_t BITMASK_8BITS = 0xFF; const uint8_t BITMASK_8BITS = 0xFF;
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
#define MODT(x) ((x) % (sizeof (T) * 8))
template <typename T> template <typename T>
constexpr T constexpr T
rotatel (const T &value, size_t magnitude) { rotatel [[gnu::pure]] (const T value, size_t magnitude)
return (value << MODT (magnitude)) | {
(value >> sizeof (value) * 8 - MODT (magnitude)); return (value << magnitude) | (value >> sizeof (value) * 8 - magnitude);
} }
template <typename T> template <typename T>
constexpr T constexpr T
rotater (const T &value, size_t magnitude) { rotater [[gnu::pure]] (const T value, size_t magnitude)
return (value >> MODT (magnitude)) | {
(value << sizeof (value) * 8 - MODT (magnitude)); return (value >> magnitude) | (value << sizeof (value) * 8 - magnitude);
} }
#undef MODT
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
// TODO: make constexpr for C++14 // TODO: make constexpr for C++14