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/* Copyright 2023 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**
* Test if unaligned access works properly
*/
#include "common.h"
#include "console.h"
#include "test_util.h"
extern "C" {
#include "shared_mem.h"
#include "timer.h"
}
#include <array>
#include <cstdio>
#include <cstring>
test_static int test_unaligned_access()
{
/* This is equivalent to {0xff, 0x09, 0x04, 0x06, 0x04, 0x06, 0x07,
* 0xed, 0x0a, 0x0b, 0x0d, 0x38, 0xbd, 0x57, 0x59} */
alignas(int32_t) constexpr std::array<int8_t, 15> test_array = {
-1, 9, 4, 6, 4, 6, 7, -19, 10, 11, 13, 56, -67, 87, 89
};
constexpr std::array<int32_t, 12> expected_results = {
0x060409ff,
0x04060409,
0x06040604,
0x07060406,
static_cast<int32_t>(0xed070604),
0x0aed0706,
0x0b0aed07,
0x0d0b0aed,
0x380d0b0a,
static_cast<int32_t>(0xbd380d0b),
0x57bd380d,
0x5957bd38
};
/* If i % 4 = 0, we have an aligned access. Otherwise, it is
unaligned access. */
for (int i = 0; i < expected_results.size(); ++i) {
const int32_t *test_array_ptr =
reinterpret_cast<const int32_t *>(test_array.data() +
i);
TEST_EQ(*test_array_ptr, expected_results[i], "0x%08x");
}
return EC_SUCCESS;
}
test_static int benchmark_unaligned_access_memcpy()
{
int i;
timestamp_t t0, t1, t2, t3;
char *buf;
const int buf_size = 1000;
const int len = 400;
const int dest_offset = 500;
const int iteration = 1000;
TEST_ASSERT(shared_mem_acquire(buf_size, &buf) == EC_SUCCESS);
for (i = 0; i < len; ++i)
buf[i] = i & 0x7f;
for (i = len; i < buf_size; ++i)
buf[i] = 0;
t0 = get_time();
for (i = 0; i < iteration; ++i) {
memcpy(buf + dest_offset + 1, buf, len); /* unaligned */
}
t1 = get_time();
TEST_ASSERT_ARRAY_EQ(buf + dest_offset + 1, buf, len);
ccprintf(" (speed gain: %" PRId64 " ->", t1.val - t0.val);
t2 = get_time();
for (i = 0; i < iteration; ++i) {
memcpy(buf + dest_offset, buf, len); /* aligned */
}
t3 = get_time();
ccprintf(" %" PRId64 " us) ", t3.val - t2.val);
TEST_ASSERT_ARRAY_EQ(buf + dest_offset, buf, len);
return EC_SUCCESS;
}
test_static int benchmark_unaligned_access_array()
{
timestamp_t t0, t1, t2, t3;
const int iteration = 1000;
alignas(int32_t) std::array<int8_t, 100> test_array_1;
std::array<int32_t, 20> test_array_2;
constexpr std::array<int32_t, 20> test_array_3 = {
67305985, 134678021, 202050057, 269422093, 336794129,
404166165, 471538201, 538910237, 606282273, 673654309,
741026345, 808398381, 875770417, 943142453, 1010514489,
1077886525, 1145258561, 1212630597, 1280002633, 1347374669
};
constexpr std::array<int32_t, 20> test_array_4 = {
50462976, 117835012, 185207048, 252579084, 319951120,
387323156, 454695192, 522067228, 589439264, 656811300,
724183336, 791555372, 858927408, 926299444, 993671480,
1061043516, 1128415552, 1195787588, 1263159624, 1330531660
};
for (int i = 0; i < test_array_1.size(); ++i) {
test_array_1[i] = static_cast<int8_t>(i);
}
t0 = get_time();
for (int t = 0; t < iteration; ++t) {
const int32_t *test_array_1_ptr =
reinterpret_cast<const int32_t *>(test_array_1.data() +
1);
for (int i = 0; i < test_array_2.size(); ++i) {
test_array_2[i] = (*test_array_1_ptr++); /* unaligned */
}
TEST_ASSERT_ARRAY_EQ(test_array_2.data(), test_array_3.data(),
test_array_2.size());
}
t1 = get_time();
ccprintf(" (speed gain: %" PRId64 " ->", t1.val - t0.val);
t2 = get_time();
for (int t = 0; t < iteration; ++t) {
const int32_t *test_array_1_ptr =
reinterpret_cast<const int32_t *>(test_array_1.data());
for (int i = 0; i < test_array_2.size(); ++i) {
test_array_2[i] = (*test_array_1_ptr++); /* aligned */
}
TEST_ASSERT_ARRAY_EQ(test_array_2.data(), test_array_4.data(),
test_array_2.size());
}
t3 = get_time();
ccprintf(" %" PRId64 " us) ", t3.val - t2.val);
return EC_SUCCESS;
}
extern "C" void run_test(int, const char **)
{
test_reset();
RUN_TEST(test_unaligned_access);
RUN_TEST(benchmark_unaligned_access_memcpy);
RUN_TEST(benchmark_unaligned_access_array);
test_print_result();
}
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