1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /* generic C version for any machine */
30
31 #include <cutils/memory.h>
32
33 #ifdef __clang__
34 __attribute__((no_sanitize("integer")))
35 #endif
android_memset16(uint16_t * dst,uint16_t value,size_t size)36 void android_memset16(uint16_t* dst, uint16_t value, size_t size)
37 {
38 /* optimized version of
39 size >>= 1;
40 while (size--)
41 *dst++ = value;
42 */
43
44 size >>= 1;
45 if (((uintptr_t)dst & 2) && size) {
46 /* fill unpaired first elem separately */
47 *dst++ = value;
48 size--;
49 }
50 /* dst is now 32-bit-aligned */
51 /* fill body with 32-bit pairs */
52 uint32_t value32 = (((uint32_t)value) << 16) | ((uint32_t)value);
53 android_memset32((uint32_t*) dst, value32, size<<1);
54 if (size & 1) {
55 dst[size-1] = value; /* fill unpaired last elem */
56 }
57 }
58
59
60 #ifdef __clang__
61 __attribute__((no_sanitize("integer")))
62 #endif
android_memset32(uint32_t * dst,uint32_t value,size_t size)63 void android_memset32(uint32_t* dst, uint32_t value, size_t size)
64 {
65 /* optimized version of
66 size >>= 2;
67 while (size--)
68 *dst++ = value;
69 */
70
71 size >>= 2;
72 if (((uintptr_t)dst & 4) && size) {
73 /* fill unpaired first 32-bit elem separately */
74 *dst++ = value;
75 size--;
76 }
77 /* dst is now 64-bit aligned */
78 /* fill body with 64-bit pairs */
79 uint64_t value64 = (((uint64_t)value) << 32) | ((uint64_t)value);
80 uint64_t* dst64 = (uint64_t*)dst;
81
82 while (size >= 12) {
83 dst64[0] = value64;
84 dst64[1] = value64;
85 dst64[2] = value64;
86 dst64[3] = value64;
87 dst64[4] = value64;
88 dst64[5] = value64;
89 size -= 12;
90 dst64 += 6;
91 }
92
93 /* fill remainder with original 32-bit single-elem loop */
94 dst = (uint32_t*) dst64;
95 while (size != 0) {
96 size--;
97 *dst++ = value;
98 }
99
100 }
101