Export of internal Abseil changes

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3d018c03a34bf273a4b24b3584ed77f0a6d21686 by Abseil Team <absl-team@google.com>:

Fix a spelling typo (s/boundries/boundaries).

PiperOrigin-RevId: 442041877
Change-Id: I608020697d37b85316bb9a0838e4b457659c926c

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518b8119e51db24ce7fb0fd2fe537ec43825c3e6 by Dino Radakovic <dinor@google.com>:

absl/types/internal/variant: Make include guard uppercase

https://google.github.io/styleguide/cppguide.html#The__define_Guard

PiperOrigin-RevId: 441911692
Change-Id: I9837dd07f20204d8253f20627b0917a34dc21825

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b91696c38310a7cae8c1ea9e2d479495f5dc3f69 by Greg Falcon <gfalcon@google.com>:

Add an internal-only API to wrap __builtin_prefetch() if available.

This private API is intended for future use by the Abseil implementation.  Like any internal-namespaced function, it may be changed or removed at any time.

PiperOrigin-RevId: 441894616
Change-Id: Iaa48bd4680b373f4a0d5afab0cb35e2a1908595f

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0f01e8b0551a662e02dff60840c54320f987315f by Derek Mauro <dmauro@google.com>:

C++20: Use the standard `constinit` keyword for `ABSL_CONST_INIT` when available

PiperOrigin-RevId: 441778874
Change-Id: I70c616469752ff23b326b1c615437599f42cc6aa
GitOrigin-RevId: 3d018c03a34bf273a4b24b3584ed77f0a6d21686

1 files changed, 43 insertions, 0 deletions

diff --git a/absl/base/internal/prefetch_test.cc b/absl/base/internal/prefetch_test.cc
new file mode 100644
index 00000000..7c1dae46
--- /dev/null
+++ b/absl/base/internal/prefetch_test.cc
@@ -0,0 +1,43 @@
+// Copyright 2022 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/prefetch.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+int number = 42;
+
+TEST(Prefetch, TemporalLocalityNone) {
+  absl::base_internal::PrefetchNta(&number);
+  EXPECT_EQ(number, 42);
+}
+
+TEST(Prefetch, TemporalLocalityLow) {
+  absl::base_internal::PrefetchT2(&number);
+  EXPECT_EQ(number, 42);
+}
+
+TEST(Prefetch, TemporalLocalityMedium) {
+  absl::base_internal::PrefetchT1(&number);
+  EXPECT_EQ(number, 42);
+}
+
+TEST(Prefetch, TemporalLocalityHigh) {
+  absl::base_internal::PrefetchT0(&number);
+  EXPECT_EQ(number, 42);
+}
+
+}  // namespace