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Revert "Bug 39129: Speeding up partition_point/lower_bound/upper_bound/ by using unsigned division by 2 when possible."

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This reverts r345525. I'm reverting because that patch apparently caused
a regression on certain platforms (see https://reviews.llvm.org/D53994).
Since we don't fully understand the reasons for the regression, I'm
reverting until we can provide a fix we understand.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@345893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Louis Dionne
2018-11-01 21:24:32 +00:00
parent 6115b72f60
commit 5dc37768e2
3 changed files with 4 additions and 153 deletions
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59
test/libcxx/algorithms/half_positive.pass.cpp
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@@ -1,59 +0,0 @@
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template <typename _Tp> _Tp __half_positive(const _Tp&);
// __half_positive divide integer number by 2 as unsigned number
// if it's safe to do so. It can be an important optimization for lower bound,
// for example.
#include <algorithm>
#include <cassert>
#include <limits>
#include <type_traits>
#include "test_macros.h"
#include "user_defined_integral.hpp"
namespace {
template <class IntType, class UnderlyingType = IntType>
TEST_CONSTEXPR bool test(IntType max_v = IntType(std::numeric_limits<UnderlyingType>::max())) {
return std::__half_positive(max_v) == max_v / 2;
}
} // namespace
int main()
{
{
assert(test<char>());
assert(test<int>());
assert(test<long>());
assert((test<UserDefinedIntegral<int>, int>()));
assert(test<size_t>());
#if !defined(_LIBCPP_HAS_NO_INT128)
assert(test<__int128_t>());
#endif // !defined(_LIBCPP_HAS_NO_INT128)
}
#if TEST_STD_VER >= 11
{
static_assert(test<char>(), "");
static_assert(test<int>(), "");
static_assert(test<long>(), "");
static_assert(test<size_t>(), "");
#if !defined(_LIBCPP_HAS_NO_INT128)
static_assert(test<__int128_t>(), "");
#endif // !defined(_LIBCPP_HAS_NO_INT128)
}
#endif // TEST_STD_VER >= 11
}