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9186b861a6
vcruntime contains the code that is linked into ucrtbase (in VS it is also provided as vcruntime140.dll) vcstartup contains the code that is statically linked into executables that link to ucrtbase.dll. In Visual Studio this is part of msvcrt.lib (the import library for msvcrt), similar to our current msvcrtex, and it gets linked when you link to ucrtbase as well. The name is based on the folder name in the library. Both libraries share some code, but each file is only compiled once.
65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
//
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// isa_available.c
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//
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// Copyright (c) 2024 Timo Kreuzer
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//
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// Implementation of __isa_available_init.
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//
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// SPDX-License-Identifier: MIT
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//
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#include <isa_availability.h>
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#include <intrin.h>
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#include <windef.h>
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#include <winbase.h>
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extern "C" { int __isa_available = 0; }
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extern "C"
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int
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__cdecl
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__isa_available_init(void)
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{
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#if defined(_M_IX86) || defined(_M_X64)
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if (IsProcessorFeaturePresent(PF_AVX512F_INSTRUCTIONS_AVAILABLE))
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{
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__isa_available = __ISA_AVAILABLE_AVX512;
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}
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else if (IsProcessorFeaturePresent(PF_AVX2_INSTRUCTIONS_AVAILABLE))
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{
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__isa_available = __ISA_AVAILABLE_AVX2;
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}
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else if (IsProcessorFeaturePresent(PF_AVX_INSTRUCTIONS_AVAILABLE))
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{
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__isa_available = __ISA_AVAILABLE_AVX;
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}
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else if (IsProcessorFeaturePresent(PF_SSE4_2_INSTRUCTIONS_AVAILABLE))
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{
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__isa_available = __ISA_AVAILABLE_SSE42;
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}
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else if (IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))
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{
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__isa_available = __ISA_AVAILABLE_SSE2;
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}
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else
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{
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__isa_available = __ISA_AVAILABLE_X86;
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}
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#elif defined(_M_ARM) || defined(_M_ARM64)
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// CHECKME: Is this correct?
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if (IsProcessorFeaturePresent(PF_ARM_V8_INSTRUCTIONS_AVAILABLE))
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{
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#ifdef _M_ARM64
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__isa_available = __ISA_AVAILABLE_NEON_ARM64;
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#else
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__isa_available = __ISA_AVAILABLE_NEON;
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#endif
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}
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else
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{
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__isa_available = __ISA_AVAILABLE_ARMNT;
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}
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#endif
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return 0;
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}
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