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[algs] Add hash for 64bit ints

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This commit is contained in:
Behdad Esfahbod 2023-05-09 11:31:06 -06:00
parent 33ef96b649
commit fe3339ea24
1 changed files with 6 additions and 1 deletions
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7
src/hb-algs.hh
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@ -315,10 +315,15 @@ struct
impl (const T& v, hb_priority<2>) const HB_RETURN (uint32_t, hb_deref (v).hash ())
// Horrible: std:hash() of integers seems to be identity in gcc / clang?!
//
template <typename T,
hb_enable_if (std::is_integral<T>::value)> constexpr auto
hb_enable_if (std::is_integral<T>::value && sizeof (T) <= sizeof (uint32_t))> constexpr auto
impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, v * 8388607u /* Mersenne prime */)
template <typename T,
hb_enable_if (std::is_integral<T>::value && sizeof (T) > sizeof (uint32_t))> constexpr auto
impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, (v * 8388607u) ^ ((v >> 32) * 8388607u) /* Mersenne prime */)
template <typename T> constexpr auto
impl (const T& v, hb_priority<0>) const HB_RETURN (uint32_t, std::hash<hb_decay<decltype (hb_deref (v))>>{} (hb_deref (v)))