Bitcoin Core  0.20.99
P2P Digital Currency
cpuid.h
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1 // Copyright (c) 2017-2019 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #ifndef BITCOIN_COMPAT_CPUID_H
6 #define BITCOIN_COMPAT_CPUID_H
7 
8 #if defined(__x86_64__) || defined(__amd64__) || defined(__i386__)
9 #define HAVE_GETCPUID
10 
11 #include <cpuid.h>
12 
13 // We can't use cpuid.h's __get_cpuid as it does not support subleafs.
14 void static inline GetCPUID(uint32_t leaf, uint32_t subleaf, uint32_t& a, uint32_t& b, uint32_t& c, uint32_t& d)
15 {
16 #ifdef __GNUC__
17  __cpuid_count(leaf, subleaf, a, b, c, d);
18 #else
19  __asm__ ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(leaf), "2"(subleaf));
20 #endif
21 }
22 
23 #endif // defined(__x86_64__) || defined(__amd64__) || defined(__i386__)
24 #endif // BITCOIN_COMPAT_CPUID_H