merge(3p/immer): Subtree merge at 'ad3e3556d' as 'third_party/immer' r/1299

Change-Id: I9636a41ad44b4218293833fd3e9456d9b07c731b

1 files changed, 166 insertions, 0 deletions

diff --git a/third_party/immer/benchmark/vector/concat.hpp b/third_party/immer/benchmark/vector/concat.hpp
new file mode 100644
index 000000000000..8656587d5dbd
--- /dev/null
+++ b/third_party/immer/benchmark/vector/concat.hpp
@@ -0,0 +1,166 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#pragma once
+
+#include "benchmark/vector/common.hpp"
+
+namespace {
+
+constexpr auto concat_steps = 10u;
+
+template <typename Vektor,
+          typename PushFn=push_back_fn>
+auto benchmark_concat()
+{
+    return [] (nonius::chronometer meter)
+    {
+        auto n = meter.param<N>();
+
+        auto v = Vektor{};
+        for (auto i = 0u; i < n; ++i)
+            v = PushFn{}(std::move(v), i);
+
+        measure(meter, [&] {
+            return v + v;
+        });
+    };
+}
+
+template <typename Fn>
+auto benchmark_concat_librrb(Fn maker)
+{
+    return
+        [=] (nonius::chronometer meter) {
+            auto n = meter.param<N>();
+            auto v = maker(n);
+            measure(meter, [&] {
+                    return rrb_concat(v, v);
+                });
+        };
+}
+
+template <typename Vektor,
+          typename PushFn=push_back_fn>
+auto benchmark_concat_incr()
+{
+    return
+        [] (nonius::chronometer meter)
+        {
+            auto n = meter.param<N>();
+
+            auto v = Vektor{};
+            for (auto i = 0u; i < n / concat_steps; ++i)
+                v = PushFn{}(std::move(v), i);
+
+            measure(meter, [&] {
+                    auto r = Vektor{};
+                    for (auto i = 0u; i < concat_steps; ++i)
+                        r = r + v;
+                    return r;
+                });
+        };
+}
+
+template <typename Vektor>
+auto benchmark_concat_incr_mut()
+{
+    return
+        [] (nonius::chronometer meter)
+        {
+            auto n = meter.param<N>();
+
+            auto v = Vektor{}.transient();
+            for (auto i = 0u; i < n / concat_steps; ++i)
+                v.push_back(i);
+
+            measure(meter, [&] (int run) {
+                auto r = Vektor{}.transient();
+                for (auto i = 0u; i < concat_steps; ++i)
+                    r.append(v);
+                return r;
+            });
+        };
+}
+
+template <typename Vektor>
+auto benchmark_concat_incr_mut2()
+{
+    return
+        [] (nonius::chronometer meter)
+        {
+            auto n = meter.param<N>();
+
+            using transient_t = typename Vektor::transient_type;
+            using steps_t = std::vector<transient_t, gc_allocator<transient_t>>;
+            auto vs = std::vector<steps_t, gc_allocator<steps_t>>(meter.runs());
+            for (auto k = 0u; k < vs.size(); ++k) {
+                vs[k].reserve(concat_steps);
+                for (auto j = 0u; j < concat_steps; ++j) {
+                    auto vv = Vektor{}.transient();
+                    for (auto i = 0u; i < n / concat_steps; ++i)
+                        vv.push_back(i);
+                    vs[k].push_back(std::move(vv));
+                }
+            }
+            measure(meter, [&] (int run) {
+                auto& vr = vs[run];
+                auto r = Vektor{}.transient();
+                assert(vr.size() == concat_steps);
+                for (auto i = 0u; i < concat_steps; ++i)
+                    r.append(std::move(vr[i]));
+                return r;
+            });
+        };
+}
+
+template <typename Vektor>
+auto benchmark_concat_incr_chunkedseq()
+{
+    return
+        [] (nonius::chronometer meter)
+        {
+            auto n = meter.param<N>();
+
+            using steps_t = std::vector<Vektor>;
+            auto vs = std::vector<steps_t>(meter.runs());
+            for (auto k = 0u; k < vs.size(); ++k) {
+                for (auto j = 0u; j < concat_steps; ++j) {
+                    auto vv = Vektor{};
+                    for (auto i = 0u; i < n / concat_steps; ++i)
+                        vv.push_back(i);
+                    vs[k].push_back(std::move(vv));
+                }
+            }
+            measure(meter, [&] (int run) {
+                auto& vr = vs[run];
+                auto r = Vektor{};
+                for (auto i = 0u; i < concat_steps; ++i)
+                    r.concat(vr[i]);
+                return r;
+            });
+        };
+}
+
+template <typename Fn>
+auto benchmark_concat_incr_librrb(Fn maker)
+{
+    return
+        [=] (nonius::chronometer meter) {
+            auto n = meter.param<N>();
+            auto v = maker(n / concat_steps);
+            measure(meter, [&] {
+                    auto r = rrb_create();
+                    for (auto i = 0ul; i < concat_steps; ++i)
+                        r = rrb_concat(r, v);
+                    return r;
+                });
+        };
+}
+
+} // anonymous namespace