[INFRA] Import NVIDIA/CCCL upstream as optimization reference library

CCCL (CUDA C++ Core Libraries) provides:
- CUB: device/block/warp-level GPU primitives (reduce, scan, sort, topk)
- Thrust: high-level parallel algorithms (transform_reduce, sort, scan)
- libcudacxx: CUDA C++ standard library (atomics, barriers, memory)
- cudax: experimental features (memory resources, allocators)
- Tuning policies: per-SM hardware-specific algorithm parameters

Competition optimization vectors mapped to CCCL:
- Output TPS (83% weight): warp_reduce, block_reduce, device_topk
- Input TPS (14% weight): device_scan, block_load, prefetch
- Cache TPS (3% weight): prefix caching strategy patterns
- Memory (0.9 util): pooled/cached/buddy allocators

Source: https://github.com/NVIDIA/cccl (shallow clone, HEAD only)
License: Apache-2.0

cccl_upstream/thrust/testing/binary_search_descending.cu

@@ -0,0 +1,121 @@
+#include <thrust/binary_search.h>
+#include <thrust/functional.h>
+#include <thrust/sequence.h>
+#include <thrust/sort.h>
+
+#include <unittest/unittest.h>
+
+//////////////////////
+// Scalar Functions //
+//////////////////////
+
+template <class Vector>
+void TestScalarLowerBoundDescendingSimple()
+{
+  using T = typename Vector::value_type;
+
+  Vector vec{8, 7, 5, 2, 0};
+
+  ASSERT_EQUAL_QUIET(vec.begin() + 4, thrust::lower_bound(vec.begin(), vec.end(), T{0}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 4, thrust::lower_bound(vec.begin(), vec.end(), T{1}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 3, thrust::lower_bound(vec.begin(), vec.end(), T{2}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 3, thrust::lower_bound(vec.begin(), vec.end(), T{3}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 3, thrust::lower_bound(vec.begin(), vec.end(), T{4}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 2, thrust::lower_bound(vec.begin(), vec.end(), T{5}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 2, thrust::lower_bound(vec.begin(), vec.end(), T{6}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 1, thrust::lower_bound(vec.begin(), vec.end(), T{7}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 0, thrust::lower_bound(vec.begin(), vec.end(), T{8}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 0, thrust::lower_bound(vec.begin(), vec.end(), T{9}, ::cuda::std::greater<T>()));
+}
+DECLARE_VECTOR_UNITTEST(TestScalarLowerBoundDescendingSimple);
+
+template <class Vector>
+void TestScalarUpperBoundDescendingSimple()
+{
+  using T = typename Vector::value_type;
+
+  Vector vec{8, 7, 5, 2, 0};
+
+  ASSERT_EQUAL_QUIET(vec.begin() + 5, thrust::upper_bound(vec.begin(), vec.end(), T{0}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 4, thrust::upper_bound(vec.begin(), vec.end(), T{1}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 4, thrust::upper_bound(vec.begin(), vec.end(), T{2}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 3, thrust::upper_bound(vec.begin(), vec.end(), T{3}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 3, thrust::upper_bound(vec.begin(), vec.end(), T{4}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 3, thrust::upper_bound(vec.begin(), vec.end(), T{5}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 2, thrust::upper_bound(vec.begin(), vec.end(), T{6}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 2, thrust::upper_bound(vec.begin(), vec.end(), T{7}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 1, thrust::upper_bound(vec.begin(), vec.end(), T{8}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL_QUIET(vec.begin() + 0, thrust::upper_bound(vec.begin(), vec.end(), T{9}, ::cuda::std::greater<T>()));
+}
+DECLARE_VECTOR_UNITTEST(TestScalarUpperBoundDescendingSimple);
+
+template <class Vector>
+void TestScalarBinarySearchDescendingSimple()
+{
+  using T = typename Vector::value_type;
+
+  Vector vec{8, 7, 5, 2, 0};
+
+  ASSERT_EQUAL(true, thrust::binary_search(vec.begin(), vec.end(), T{0}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(false, thrust::binary_search(vec.begin(), vec.end(), T{1}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(true, thrust::binary_search(vec.begin(), vec.end(), T{2}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(false, thrust::binary_search(vec.begin(), vec.end(), T{3}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(false, thrust::binary_search(vec.begin(), vec.end(), T{4}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(true, thrust::binary_search(vec.begin(), vec.end(), T{5}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(false, thrust::binary_search(vec.begin(), vec.end(), T{6}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(true, thrust::binary_search(vec.begin(), vec.end(), T{7}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(true, thrust::binary_search(vec.begin(), vec.end(), T{8}, ::cuda::std::greater<T>()));
+  ASSERT_EQUAL(false, thrust::binary_search(vec.begin(), vec.end(), T{9}, ::cuda::std::greater<T>()));
+}
+DECLARE_VECTOR_UNITTEST(TestScalarBinarySearchDescendingSimple);
+
+template <class Vector>
+void TestScalarEqualRangeDescendingSimple()
+{
+  using T = typename Vector::value_type;
+
+  Vector vec{8, 7, 5, 2, 0};
+
+  ASSERT_EQUAL_QUIET(vec.begin() + 4,
+                     thrust::equal_range(vec.begin(), vec.end(), T{0}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 4,
+                     thrust::equal_range(vec.begin(), vec.end(), T{1}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 3,
+                     thrust::equal_range(vec.begin(), vec.end(), T{2}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 3,
+                     thrust::equal_range(vec.begin(), vec.end(), T{3}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 3,
+                     thrust::equal_range(vec.begin(), vec.end(), T{4}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 2,
+                     thrust::equal_range(vec.begin(), vec.end(), T{5}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 2,
+                     thrust::equal_range(vec.begin(), vec.end(), T{6}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 1,
+                     thrust::equal_range(vec.begin(), vec.end(), T{7}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 0,
+                     thrust::equal_range(vec.begin(), vec.end(), T{8}, ::cuda::std::greater<T>()).first);
+  ASSERT_EQUAL_QUIET(vec.begin() + 0,
+                     thrust::equal_range(vec.begin(), vec.end(), T{9}, ::cuda::std::greater<T>()).first);
+
+  ASSERT_EQUAL_QUIET(vec.begin() + 5,
+                     thrust::equal_range(vec.begin(), vec.end(), T{0}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 4,
+                     thrust::equal_range(vec.begin(), vec.end(), T{1}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 4,
+                     thrust::equal_range(vec.begin(), vec.end(), T{2}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 3,
+                     thrust::equal_range(vec.begin(), vec.end(), T{3}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 3,
+                     thrust::equal_range(vec.begin(), vec.end(), T{4}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 3,
+                     thrust::equal_range(vec.begin(), vec.end(), T{5}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 2,
+                     thrust::equal_range(vec.begin(), vec.end(), T{6}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 2,
+                     thrust::equal_range(vec.begin(), vec.end(), T{7}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 1,
+                     thrust::equal_range(vec.begin(), vec.end(), T{8}, ::cuda::std::greater<T>()).second);
+  ASSERT_EQUAL_QUIET(vec.begin() + 0,
+                     thrust::equal_range(vec.begin(), vec.end(), T{9}, ::cuda::std::greater<T>()).second);
+}
+DECLARE_VECTOR_UNITTEST(TestScalarEqualRangeDescendingSimple);