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98 lines
3.1 KiB
98 lines
3.1 KiB
// AsmJit - Machine code generation for C++
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//
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// * Official AsmJit Home Page: https://asmjit.com
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// * Official Github Repository: https://github.com/asmjit/asmjit
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//
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// Copyright (c) 2008-2020 The AsmJit Authors
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would be
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// appreciated but is not required.
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// 2. Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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// 3. This notice may not be removed or altered from any source distribution.
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#include "../core/api-build_p.h"
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#include "../core/cpuinfo.h"
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#if !defined(_WIN32)
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#include <errno.h>
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#include <sys/utsname.h>
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#include <unistd.h>
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#endif
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ASMJIT_BEGIN_NAMESPACE
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// ============================================================================
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// [asmjit::CpuInfo - Detect - CPU NumThreads]
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// ============================================================================
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#if defined(_WIN32)
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static inline uint32_t detectHWThreadCount() noexcept {
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SYSTEM_INFO info;
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::GetSystemInfo(&info);
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return info.dwNumberOfProcessors;
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}
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#elif defined(_SC_NPROCESSORS_ONLN)
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static inline uint32_t detectHWThreadCount() noexcept {
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long res = ::sysconf(_SC_NPROCESSORS_ONLN);
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return res <= 0 ? uint32_t(1) : uint32_t(res);
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}
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#else
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static inline uint32_t detectHWThreadCount() noexcept {
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return 1;
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}
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#endif
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// ============================================================================
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// [asmjit::CpuInfo - Detect - CPU Features]
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// ============================================================================
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#if defined(ASMJIT_BUILD_X86) && ASMJIT_ARCH_X86
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namespace x86 { void detectCpu(CpuInfo& cpu) noexcept; }
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#endif
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#if defined(ASMJIT_BUILD_ARM) && ASMJIT_ARCH_ARM
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namespace arm { void detectCpu(CpuInfo& cpu) noexcept; }
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#endif
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// ============================================================================
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// [asmjit::CpuInfo - Detect - Static Initializer]
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// ============================================================================
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static uint32_t cpuInfoInitialized;
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static CpuInfo cpuInfoGlobal(Globals::NoInit);
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const CpuInfo& CpuInfo::host() noexcept {
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// This should never cause a problem as the resulting information should
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// always be the same.
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if (!cpuInfoInitialized) {
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CpuInfo cpuInfoLocal;
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#if defined(ASMJIT_BUILD_X86) && ASMJIT_ARCH_X86
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x86::detectCpu(cpuInfoLocal);
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#endif
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#if defined(ASMJIT_BUILD_ARM) && ASMJIT_ARCH_ARM
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arm::detectCpu(cpuInfoLocal);
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#endif
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cpuInfoLocal._hwThreadCount = detectHWThreadCount();
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cpuInfoGlobal = cpuInfoLocal;
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cpuInfoInitialized = 1;
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}
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return cpuInfoGlobal;
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}
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ASMJIT_END_NAMESPACE
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