116 lines
3.0 KiB
C++
116 lines
3.0 KiB
C++
// sse_simd.cpp - written and placed in the public domain by
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// Jeffrey Walton, Uri Blumenthal and Marcel Raad.
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//
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// This source file uses intrinsics to gain access to SSE for CPU
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// feature testing. A separate source file is needed because additional
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// CXXFLAGS are required to enable the appropriate instructions set in
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// some build configurations.
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#include "pch.h"
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#include "config.h"
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#include "cpu.h"
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// Needed by MIPS for definition of NULL
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#include "stdcpp.h"
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
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# include <signal.h>
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# include <setjmp.h>
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#endif
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#ifndef EXCEPTION_EXECUTE_HANDLER
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# define EXCEPTION_EXECUTE_HANDLER 1
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#endif
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// Needed by SunCC and MSVC
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#if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
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# if !defined(CRYPTOPP_NO_CPU_FEATURE_PROBES) && !CRYPTOPP_SSE2_ASM_AVAILABLE && CRYPTOPP_SSE2_INTRIN_AVAILABLE
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# include <emmintrin.h>
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# endif
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#endif
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// Squash MS LNK4221 and libtool warnings
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extern const char SSE_SIMD_FNAME[] = __FILE__;
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NAMESPACE_BEGIN(CryptoPP)
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
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extern "C" {
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typedef void (*SigHandler)(int);
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}
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extern "C"
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{
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static jmp_buf s_jmpNoSSE2;
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static void SigIllHandler(int)
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{
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longjmp(s_jmpNoSSE2, 1);
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}
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}
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#endif // CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
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bool CPU_ProbeSSE2()
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{
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// Apple switched to Intel desktops in 2005/2006 using
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// Core2 Duo's, which provides SSE2 and above.
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#if CRYPTOPP_BOOL_X64 || defined(__APPLE__)
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return true;
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#elif defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
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return false;
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#elif defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
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__try
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{
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# if CRYPTOPP_SSE2_ASM_AVAILABLE
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AS2(por xmm0, xmm0) // executing SSE2 instruction
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# elif CRYPTOPP_SSE2_INTRIN_AVAILABLE
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__m128i x = _mm_setzero_si128();
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return _mm_cvtsi128_si32(x) == 0;
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# endif
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}
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// GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION
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__except (EXCEPTION_EXECUTE_HANDLER)
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{
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return false;
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}
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return true;
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#else
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// longjmp and clobber warnings. Volatile is required.
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// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
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volatile bool result = true;
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volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
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if (oldHandler == SIG_ERR)
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return false;
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# ifndef __MINGW32__
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volatile sigset_t oldMask;
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if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
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{
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signal(SIGILL, oldHandler);
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return false;
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}
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# endif
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if (setjmp(s_jmpNoSSE2))
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result = false;
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else
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{
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# if CRYPTOPP_SSE2_ASM_AVAILABLE
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__asm __volatile ("por %xmm0, %xmm0");
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# elif CRYPTOPP_SSE2_INTRIN_AVAILABLE
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__m128i x = _mm_setzero_si128();
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result = _mm_cvtsi128_si32(x) == 0;
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# endif
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}
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# ifndef __MINGW32__
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sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
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# endif
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signal(SIGILL, oldHandler);
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return result;
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#endif
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}
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NAMESPACE_END
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