1/*
2 * Copyright 2010-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License").
5 * You may not use this file except in compliance with the License.
6 * A copy of the License is located at
7 *
8 * http://aws.amazon.com/apache2.0
9 *
10 * or in the "license" file accompanying this file. This file is distributed
11 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
12 * express or implied. See the License for the specific language governing
13 * permissions and limitations under the License.
14 */
15
16#include <aws/checksums/private/cpuid.h>
17
18#if (!defined(_M_ARM) && !defined(__arm__) && !defined(__ARM_ARCH_ISA_A64)) && \
19 ((!defined(__x86_64__) && !defined(_M_X64) && !defined(_M_IX86)) || (defined(__GNUC__) && defined(DEBUG_BUILD)))
20
21/* clang-format is being dumb and wrong, this can't be const or the symbols won't match */
22/* NOLINTNEXTLINE(readability-non-const-parameter) */
23int aws_checksums_do_cpu_id(int32_t *cpuid) {
24 (void)cpuid;
25 return 0;
26}
27
28#endif
29
30static int32_t s_cpuid = 0;
31
32static void do_check(void) {
33 if (!s_cpuid) {
34 aws_checksums_do_cpu_id(&s_cpuid);
35 }
36}
37
38/** Returns non-zero if the CPU supports the PCLMULQDQ instruction. */
39int aws_checksums_is_clmul_present(void) {
40 do_check();
41 return s_cpuid & 0x00000002;
42}
43
44/** Returns non-zero if the CPU supports SSE4.1 instructions. */
45int aws_checksums_is_sse41_present(void) {
46 do_check();
47 return s_cpuid & 0x00080000;
48}
49
50/** Returns non-zero if the CPU supports SSE4.2 instructions (i.e. CRC32). */
51int aws_checksums_is_sse42_present(void) {
52 do_check();
53 return s_cpuid & 0x00100000;
54}
55