From f617f9e266812cf0ff58bcc693e097d19310ebcb Mon Sep 17 00:00:00 2001
From: Brian Barcenas <bbarcenas@google.com>
Date: Sat, 10 Dec 2022 01:15:29 +0000
Subject: [PATCH] pw_checksum: Added CRC16 performance testing

Change-Id: I8add879e4ba63ee21400a7a37c7326dc00be2700
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/123173
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
---
 pw_checksum/BUILD.bazel              |  9 ++++++
 pw_checksum/BUILD.gn                 | 14 +++++++++-
 pw_checksum/crc16_ccitt_perf_test.cc | 41 ++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 pw_checksum/crc16_ccitt_perf_test.cc

diff --git a/pw_checksum/BUILD.bazel b/pw_checksum/BUILD.bazel
index 3e748ca4c2..adf33dd532 100644
--- a/pw_checksum/BUILD.bazel
+++ b/pw_checksum/BUILD.bazel
@@ -75,3 +75,12 @@ pw_cc_perf_test(
         "//pw_bytes",
     ],
 )
+
+pw_cc_perf_test(
+    name = "crc16_perf_test",
+    srcs = ["crc16_ccitt_perf_test.cc"],
+    deps = [
+        ":pw_checksum",
+        "//pw_bytes",
+    ],
+)
diff --git a/pw_checksum/BUILD.gn b/pw_checksum/BUILD.gn
index 79a113f70a..450d701548 100644
--- a/pw_checksum/BUILD.gn
+++ b/pw_checksum/BUILD.gn
@@ -104,8 +104,20 @@ pw_perf_test("crc32_perf_tests") {
   sources = [ "crc32_perf_test.cc" ]
 }
 
+pw_perf_test("crc16_perf_tests") {
+  enable_if = pw_perf_test_TIMER_INTERFACE_BACKEND != ""
+  deps = [
+    ":pw_checksum",
+    dir_pw_bytes,
+  ]
+  sources = [ "crc16_ccitt_perf_test.cc" ]
+}
+
 group("perf_tests") {
-  deps = [ ":crc32_perf_tests" ]
+  deps = [
+    ":crc16_perf_tests",
+    ":crc32_perf_tests",
+  ]
 }
 
 pw_size_diff("size_report") {
diff --git a/pw_checksum/crc16_ccitt_perf_test.cc b/pw_checksum/crc16_ccitt_perf_test.cc
new file mode 100644
index 0000000000..0ec9b0582c
--- /dev/null
+++ b/pw_checksum/crc16_ccitt_perf_test.cc
@@ -0,0 +1,41 @@
+// Copyright 2022 The Pigweed 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 <string_view>
+
+#include "pw_bytes/array.h"
+#include "pw_checksum/crc16_ccitt.h"
+#include "pw_perf_test/perf_test.h"
+#include "pw_span/internal/span_impl.h"
+#include "pw_span/span.h"
+
+namespace pw::checksum {
+namespace {
+
+constexpr std::string_view kString =
+    "In the beginning the Universe was created. This has made a lot of "
+    "people very angry and been widely regarded as a bad move.";
+constexpr auto kBytes = bytes::Initialized<1000>([](size_t i) { return i; });
+
+void CcittCalculationTest(span<const std::byte> input) {
+  Crc16Ccitt::Calculate(input);
+}
+
+PW_PERF_TEST_SIMPLE(CcittCalculationBytes, CcittCalculationTest, kBytes);
+PW_PERF_TEST_SIMPLE(CcittCalculationString,
+                    CcittCalculationTest,
+                    as_bytes(span(kString)));
+
+}  // namespace
+}  // namespace pw::checksum