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[ADT] PointerUnion: Use C++14 constexpr std::min 

llvm-svn: 368992
This commit is contained in:
Benjamin Kramer 2019-08-15 11:49:00 +00:00
parent e1bc32bddf
commit 5e9a16408c
1 changed files with 2 additions and 9 deletions
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11
llvm/include/llvm/ADT/PointerUnion.h
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@ -54,21 +54,14 @@ struct PointerUnionTypeSelectorReturn<
};
namespace pointer_union_detail {
constexpr int constexprMin(int a, int b) { return a < b ? a : b; }
/// Determine the number of bits required to store integers with values < n.
/// This is ceil(log2(n)).
constexpr int bitsRequired(unsigned n) {
return n > 1 ? 1 + bitsRequired((n + 1) / 2) : 0;
}
// FIXME: In C++14, replace this with
// std::min({PointerLikeTypeTraits<Ts>::NumLowBitsAvailable...})
template <typename T> constexpr int lowBitsAvailable() {
return PointerLikeTypeTraits<T>::NumLowBitsAvailable;
}
template <typename T1, typename T2, typename... Ts>
constexpr int lowBitsAvailable() {
return constexprMin(lowBitsAvailable<T1>(), lowBitsAvailable<T2, Ts...>());
template <typename... Ts> constexpr int lowBitsAvailable() {
return std::min<int>({PointerLikeTypeTraits<Ts>::NumLowBitsAvailable...});
}
/// Find the index of a type in a list of types. TypeIndex<T, Us...>::Index