Add android_memset16/android_memset32 for aarch64.
Included new unit tests for these functions.
Bug: 15456369
Change-Id: I3fac02f61c62d15d54d0df51957680d7155e98ae
diff --git a/libcutils/tests/MemsetTest.cpp b/libcutils/tests/MemsetTest.cpp
new file mode 100644
index 0000000..45efc51
--- /dev/null
+++ b/libcutils/tests/MemsetTest.cpp
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * 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
+ *
+ * http://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 <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <cutils/memory.h>
+#include <gtest/gtest.h>
+
+#define FENCEPOST_LENGTH 8
+
+#define MAX_TEST_SIZE (64*1024)
+// Choose values that have no repeating byte values.
+#define MEMSET16_PATTERN 0xb139
+#define MEMSET32_PATTERN 0x48193a27
+
+enum test_e {
+ MEMSET16 = 0,
+ MEMSET32,
+};
+
+static int g_memset16_aligns[][2] = {
+ { 2, 0 },
+ { 4, 0 },
+ { 8, 0 },
+ { 16, 0 },
+ { 32, 0 },
+ { 64, 0 },
+ { 128, 0 },
+
+ { 4, 2 },
+
+ { 8, 2 },
+ { 8, 4 },
+ { 8, 6 },
+
+ { 128, 2 },
+ { 128, 4 },
+ { 128, 6 },
+ { 128, 8 },
+ { 128, 10 },
+ { 128, 12 },
+ { 128, 14 },
+ { 128, 16 },
+};
+
+static int g_memset32_aligns[][2] = {
+ { 4, 0 },
+ { 8, 0 },
+ { 16, 0 },
+ { 32, 0 },
+ { 64, 0 },
+ { 128, 0 },
+
+ { 8, 4 },
+
+ { 128, 4 },
+ { 128, 8 },
+ { 128, 12 },
+ { 128, 16 },
+};
+
+static size_t GetIncrement(size_t len, size_t min_incr) {
+ if (len >= 4096) {
+ return 1024;
+ } else if (len >= 1024) {
+ return 256;
+ }
+ return min_incr;
+}
+
+// Return a pointer into the current buffer with the specified alignment.
+static void *GetAlignedPtr(void *orig_ptr, int alignment, int or_mask) {
+ uint64_t ptr = reinterpret_cast<uint64_t>(orig_ptr);
+ if (alignment > 0) {
+ // When setting the alignment, set it to exactly the alignment chosen.
+ // The pointer returned will be guaranteed not to be aligned to anything
+ // more than that.
+ ptr += alignment - (ptr & (alignment - 1));
+ ptr |= alignment | or_mask;
+ }
+
+ return reinterpret_cast<void*>(ptr);
+}
+
+static void SetFencepost(uint8_t *buffer) {
+ for (int i = 0; i < FENCEPOST_LENGTH; i += 2) {
+ buffer[i] = 0xde;
+ buffer[i+1] = 0xad;
+ }
+}
+
+static void VerifyFencepost(uint8_t *buffer) {
+ for (int i = 0; i < FENCEPOST_LENGTH; i += 2) {
+ if (buffer[i] != 0xde || buffer[i+1] != 0xad) {
+ uint8_t expected_value;
+ if (buffer[i] == 0xde) {
+ i++;
+ expected_value = 0xad;
+ } else {
+ expected_value = 0xde;
+ }
+ ASSERT_EQ(expected_value, buffer[i]);
+ }
+ }
+}
+
+void RunMemsetTests(test_e test_type, uint32_t value, int align[][2], size_t num_aligns) {
+ size_t min_incr = 4;
+ if (test_type == MEMSET16) {
+ min_incr = 2;
+ value |= value << 16;
+ }
+ uint32_t* expected_buf = new uint32_t[MAX_TEST_SIZE/sizeof(uint32_t)];
+ for (size_t i = 0; i < MAX_TEST_SIZE/sizeof(uint32_t); i++) {
+ expected_buf[i] = value;
+ }
+
+ // Allocate one large buffer with lots of extra space so that we can
+ // guarantee that all possible alignments will fit.
+ uint8_t *buf = new uint8_t[3*MAX_TEST_SIZE];
+ uint8_t *buf_align;
+ for (size_t i = 0; i < num_aligns; i++) {
+ size_t incr = min_incr;
+ for (size_t len = incr; len <= MAX_TEST_SIZE; len += incr) {
+ incr = GetIncrement(len, min_incr);
+
+ buf_align = reinterpret_cast<uint8_t*>(GetAlignedPtr(
+ buf+FENCEPOST_LENGTH, align[i][0], align[i][1]));
+
+ SetFencepost(&buf_align[-FENCEPOST_LENGTH]);
+ SetFencepost(&buf_align[len]);
+
+ memset(buf_align, 0xff, len);
+ if (test_type == MEMSET16) {
+ android_memset16(reinterpret_cast<uint16_t*>(buf_align), value, len);
+ } else {
+ android_memset32(reinterpret_cast<uint32_t*>(buf_align), value, len);
+ }
+ ASSERT_EQ(0, memcmp(expected_buf, buf_align, len))
+ << "Failed size " << len << " align " << align[i][0] << " " << align[i][1] << "\n";
+
+ VerifyFencepost(&buf_align[-FENCEPOST_LENGTH]);
+ VerifyFencepost(&buf_align[len]);
+ }
+ }
+ delete expected_buf;
+ delete buf;
+}
+
+TEST(libcutils, android_memset16_non_zero) {
+ RunMemsetTests(MEMSET16, MEMSET16_PATTERN, g_memset16_aligns, sizeof(g_memset16_aligns)/sizeof(int[2]));
+}
+
+TEST(libcutils, android_memset16_zero) {
+ RunMemsetTests(MEMSET16, 0, g_memset16_aligns, sizeof(g_memset16_aligns)/sizeof(int[2]));
+}
+
+TEST(libcutils, android_memset32_non_zero) {
+ RunMemsetTests(MEMSET32, MEMSET32_PATTERN, g_memset32_aligns, sizeof(g_memset32_aligns)/sizeof(int[2]));
+}
+
+TEST(libcutils, android_memset32_zero) {
+ RunMemsetTests(MEMSET32, 0, g_memset32_aligns, sizeof(g_memset32_aligns)/sizeof(int[2]));
+}