mirror of
https://github.com/nzbget/nzbget.git
synced 2026-01-19 19:37:49 -05:00
69a0db63f6
1) integrated the library; 2) splitted units by CPU architecture; 3) extended makefile and configure script to detect CPU architecture and use appropriate compiler flags; 4) runtime CPU features detection for x86 and ARM with dynamic code dispatching; 5) temporary (for test purposes) printing info about SIMD support to stdout on program startup; 6) new SIMD routines are not yet used in the program
142 lines
3.7 KiB
C++
142 lines
3.7 KiB
C++
/*
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* Based on node-yencode library by Anime Tosho:
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* https://github.com/animetosho/node-yencode
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*
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* Copyright (C) 2017 Anime Tosho (animetosho)
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* Copyright (C) 2017 Andrey Prygunkov <hugbug@users.sourceforge.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "nzbget.h"
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#if (defined(__i686__) || defined(__amd64__)) && !defined(WIN32)
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#include <cpuid.h>
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#endif
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#include "YEncode.h"
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namespace YEncode
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{
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size_t (*decode)(const unsigned char*, unsigned char*, size_t, char* state) = nullptr;
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size_t (*decode_simd)(const unsigned char*, unsigned char*, size_t, char* state) = nullptr;
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uint32_t (*crc32_simd)(const unsigned char* src, long len) = nullptr;
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uint32_t (*inc_crc32_simd)(uint32_t crc, const unsigned char* src, long len) = nullptr;
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#if defined(__i686__) || defined(__amd64__)
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size_t (*decode_sse2)(const unsigned char* src, unsigned char* dest, size_t len, char* state) = nullptr;
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extern void init_decode_sse2();
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size_t (*decode_ssse3)(const unsigned char* src, unsigned char* dest, size_t len, char* state) = nullptr;
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extern void init_decode_ssse3();
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uint32_t (*crc32_pclmul)(const unsigned char *src, long len) = nullptr;
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extern void init_crc32_pclmul();
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class CpuId
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{
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uint32_t regs[4];
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public:
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CpuId(unsigned level)
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{
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#ifdef WIN32
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__cpuid((int *)regs, (int)level);
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#else
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__cpuid(level, regs[0], regs[1], regs[2], regs[3]);
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#endif
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}
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const uint32_t &EAX() const {return regs[0];}
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const uint32_t &EBX() const {return regs[1];}
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const uint32_t &ECX() const {return regs[2];}
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const uint32_t &EDX() const {return regs[3];}
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};
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#endif
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#if defined(__arm__) || defined(__aarch64__)
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size_t (*decode_neon)(const unsigned char* src, unsigned char* dest, size_t len, char* state) = nullptr;
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extern void init_decode_neon();
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uint32_t (*crc32_arm)(const unsigned char *src, long len) = nullptr;
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extern void init_crc32_arm();
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#endif
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void init()
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{
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decode = &decode_scalar;
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#if defined(__i686__) || defined(__amd64__)
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CpuId cpuid(1);
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bool cpu_supports_sse2 = cpuid.EDX() & 0x04000000;
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bool cpu_supports_ssse3 = cpuid.ECX() & 0x00000200;
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bool cpu_supports_sse41 = cpuid.ECX() & 0x00080000;
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bool cpu_supports_pclmul = cpuid.ECX() & 0x00000002;
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if (cpu_supports_sse2)
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{
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init_decode_sse2();
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decode_simd = decode_sse2;
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}
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if (cpu_supports_ssse3)
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{
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init_decode_ssse3();
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if (decode_ssse3)
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{
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decode_simd = decode_ssse3;
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}
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}
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if (cpu_supports_sse41 && cpu_supports_pclmul)
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{
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init_crc32_pclmul();
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crc32_simd = crc32_pclmul;
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}
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#endif
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#if defined(__arm__) || defined(__aarch64__)
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bool cpu_supports_neon = false;
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bool cpu_supports_crc = false;
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#ifdef __linux__
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if (FILE* file = fopen("/proc/cpuinfo", "r"))
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{
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char buf[200];
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while (fgets(buf, sizeof(buf), file))
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{
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cpu_supports_neon |= !strncasecmp(buf, "Features", 8) &&
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(strstr(buf, " neon ") || strstr(buf, " asimd "));
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cpu_supports_crc |= !strncasecmp(buf, "Features", 8) && strstr(buf, " crc32 ");
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}
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fclose(file);
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}
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#endif
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if (cpu_supports_neon)
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{
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init_decode_neon();
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decode_simd = decode_neon;
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}
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if (cpu_supports_crc)
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{
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init_crc32_arm();
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crc32_simd = crc32_arm;
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}
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#endif
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if (decode_simd)
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{
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decode = decode_simd;
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}
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}
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}
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