mirror of https://github.com/axmolengine/axmol.git
143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
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#include "config.h"
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#include "cpu_caps.h"
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#if defined(_WIN32) && (defined(_M_ARM) || defined(_M_ARM64))
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#ifndef PF_ARM_NEON_INSTRUCTIONS_AVAILABLE
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#define PF_ARM_NEON_INSTRUCTIONS_AVAILABLE 19
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#endif
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#endif
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#ifdef HAVE_INTRIN_H
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#include <intrin.h>
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#endif
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#ifdef HAVE_CPUID_H
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#include <cpuid.h>
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#endif
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#include <array>
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#include <cctype>
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#include <string>
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int CPUCapFlags{0};
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namespace {
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#if defined(HAVE_GCC_GET_CPUID) \
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&& (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64))
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using reg_type = unsigned int;
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inline std::array<reg_type,4> get_cpuid(unsigned int f)
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{
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std::array<reg_type,4> ret{};
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__get_cpuid(f, &ret[0], &ret[1], &ret[2], &ret[3]);
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return ret;
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}
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#define CAN_GET_CPUID
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#elif defined(HAVE_CPUID_INTRINSIC) \
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&& (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64))
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using reg_type = int;
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inline std::array<reg_type,4> get_cpuid(unsigned int f)
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{
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std::array<reg_type,4> ret{};
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(__cpuid)(ret.data(), f);
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return ret;
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}
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#define CAN_GET_CPUID
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#endif
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} // namespace
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al::optional<CPUInfo> GetCPUInfo()
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{
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CPUInfo ret;
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#ifdef CAN_GET_CPUID
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auto cpuregs = get_cpuid(0);
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if(cpuregs[0] == 0)
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return al::nullopt;
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const reg_type maxfunc{cpuregs[0]};
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cpuregs = get_cpuid(0x80000000);
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const reg_type maxextfunc{cpuregs[0]};
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ret.mVendor.append(reinterpret_cast<char*>(&cpuregs[1]), 4);
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ret.mVendor.append(reinterpret_cast<char*>(&cpuregs[3]), 4);
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ret.mVendor.append(reinterpret_cast<char*>(&cpuregs[2]), 4);
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auto iter_end = std::remove(ret.mVendor.begin(), ret.mVendor.end(), '\0');
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iter_end = std::unique(ret.mVendor.begin(), iter_end,
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[](auto&& c0, auto&& c1) { return std::isspace(c0) && std::isspace(c1); });
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ret.mVendor.erase(iter_end, ret.mVendor.end());
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if(!ret.mVendor.empty() && std::isspace(ret.mVendor.back()))
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ret.mVendor.pop_back();
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if(!ret.mVendor.empty() && std::isspace(ret.mVendor.front()))
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ret.mVendor.erase(ret.mVendor.begin());
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if(maxextfunc >= 0x80000004)
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{
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cpuregs = get_cpuid(0x80000002);
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ret.mName.append(reinterpret_cast<char*>(cpuregs.data()), 16);
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cpuregs = get_cpuid(0x80000003);
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ret.mName.append(reinterpret_cast<char*>(cpuregs.data()), 16);
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cpuregs = get_cpuid(0x80000004);
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ret.mName.append(reinterpret_cast<char*>(cpuregs.data()), 16);
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iter_end = std::remove(ret.mName.begin(), ret.mName.end(), '\0');
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iter_end = std::unique(ret.mName.begin(), iter_end,
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[](auto&& c0, auto&& c1) { return std::isspace(c0) && std::isspace(c1); });
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ret.mName.erase(iter_end, ret.mName.end());
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if(!ret.mName.empty() && std::isspace(ret.mName.back()))
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ret.mName.pop_back();
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if(!ret.mName.empty() && std::isspace(ret.mName.front()))
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ret.mName.erase(ret.mName.begin());
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}
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if(maxfunc >= 1)
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{
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cpuregs = get_cpuid(1);
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if((cpuregs[3]&(1<<25)))
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ret.mCaps |= CPU_CAP_SSE;
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if((ret.mCaps&CPU_CAP_SSE) && (cpuregs[3]&(1<<26)))
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ret.mCaps |= CPU_CAP_SSE2;
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if((ret.mCaps&CPU_CAP_SSE2) && (cpuregs[2]&(1<<0)))
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ret.mCaps |= CPU_CAP_SSE3;
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if((ret.mCaps&CPU_CAP_SSE3) && (cpuregs[2]&(1<<19)))
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ret.mCaps |= CPU_CAP_SSE4_1;
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}
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#else
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/* Assume support for whatever's supported if we can't check for it */
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#if defined(HAVE_SSE4_1)
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#warning "Assuming SSE 4.1 run-time support!"
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ret.mCaps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3 | CPU_CAP_SSE4_1;
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#elif defined(HAVE_SSE3)
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#warning "Assuming SSE 3 run-time support!"
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ret.mCaps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3;
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#elif defined(HAVE_SSE2)
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#warning "Assuming SSE 2 run-time support!"
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ret.mCaps |= CPU_CAP_SSE | CPU_CAP_SSE2;
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#elif defined(HAVE_SSE)
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#warning "Assuming SSE run-time support!"
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ret.mCaps |= CPU_CAP_SSE;
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#endif
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#endif /* CAN_GET_CPUID */
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#ifdef HAVE_NEON
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#ifdef __ARM_NEON
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ret.mCaps |= CPU_CAP_NEON;
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#elif defined(_WIN32) && (defined(_M_ARM) || defined(_M_ARM64))
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if(IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE))
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ret.mCaps |= CPU_CAP_NEON;
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#else
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#warning "Assuming NEON run-time support!"
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ret.mCaps |= CPU_CAP_NEON;
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#endif
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#endif
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return al::make_optional(ret);
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}
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