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115 lines
3.0 KiB
115 lines
3.0 KiB
// 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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