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) */ |
23 | int aws_checksums_do_cpu_id(int32_t *cpuid) { |
24 | (void)cpuid; |
25 | return 0; |
26 | } |
27 | |
28 | #endif |
29 | |
30 | static int32_t s_cpuid = 0; |
31 | |
32 | static 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. */ |
39 | int 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. */ |
45 | int 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). */ |
51 | int aws_checksums_is_sse42_present(void) { |
52 | do_check(); |
53 | return s_cpuid & 0x00100000; |
54 | } |
55 | |