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55 lines
1.7 KiB
C
Executable File
55 lines
1.7 KiB
C
Executable File
/*
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* Copyright 2010-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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#include <aws/checksums/private/cpuid.h>
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#if (!defined(_M_ARM) && !defined(__arm__) && !defined(__ARM_ARCH_ISA_A64)) && \
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((!defined(__x86_64__) && !defined(_M_X64) && !defined(_M_IX86)) || (defined(__GNUC__) && defined(DEBUG_BUILD)))
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/* clang-format is being dumb and wrong, this can't be const or the symbols won't match */
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/* NOLINTNEXTLINE(readability-non-const-parameter) */
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int aws_checksums_do_cpu_id(int32_t *cpuid) {
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(void)cpuid;
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return 0;
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}
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#endif
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static int32_t s_cpuid = 0;
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static void do_check(void) {
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if (!s_cpuid) {
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aws_checksums_do_cpu_id(&s_cpuid);
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}
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}
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/** Returns non-zero if the CPU supports the PCLMULQDQ instruction. */
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int aws_checksums_is_clmul_present(void) {
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do_check();
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return s_cpuid & 0x00000002;
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}
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/** Returns non-zero if the CPU supports SSE4.1 instructions. */
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int aws_checksums_is_sse41_present(void) {
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do_check();
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return s_cpuid & 0x00080000;
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}
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/** Returns non-zero if the CPU supports SSE4.2 instructions (i.e. CRC32). */
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int aws_checksums_is_sse42_present(void) {
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do_check();
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return s_cpuid & 0x00100000;
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}
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