You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
3.0 KiB
116 lines
3.0 KiB
4 years ago
|
// sse_simd.cpp - written and placed in the public domain by
|
||
|
|
// Jeffrey Walton, Uri Blumenthal and Marcel Raad.
|
||
|
|
//
|
||
|
|
// This source file uses intrinsics to gain access to SSE for CPU
|
||
|
|
// feature testing. A separate source file is needed because additional
|
||
|
|
// CXXFLAGS are required to enable the appropriate instructions set in
|
||
|
|
// some build configurations.
|
||
|
|
|
||
|
|
#include "pch.h"
|
||
|
|
#include "config.h"
|
||
|
|
#include "cpu.h"
|
||
|
|
|
||
|
|
// Needed by MIPS for definition of NULL
|
||
|
|
#include "stdcpp.h"
|
||
|
|
|
||
|
|
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
|
||
|
|
# include <signal.h>
|
||
|
|
# include <setjmp.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef EXCEPTION_EXECUTE_HANDLER
|
||
|
|
# define EXCEPTION_EXECUTE_HANDLER 1
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// Needed by SunCC and MSVC
|
||
|
|
#if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
|
||
|
|
# if !defined(CRYPTOPP_NO_CPU_FEATURE_PROBES) && !CRYPTOPP_SSE2_ASM_AVAILABLE && CRYPTOPP_SSE2_INTRIN_AVAILABLE
|
||
|
|
# include <emmintrin.h>
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// Squash MS LNK4221 and libtool warnings
|
||
|
|
extern const char SSE_SIMD_FNAME[] = __FILE__;
|
||
|
|
|
||
|
|
NAMESPACE_BEGIN(CryptoPP)
|
||
|
|
|
||
|
|
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
|
||
|
|
extern "C" {
|
||
|
|
typedef void (*SigHandler)(int);
|
||
|
|
}
|
||
|
|
|
||
|
|
extern "C"
|
||
|
|
{
|
||
|
|
static jmp_buf s_jmpNoSSE2;
|
||
|
|
static void SigIllHandler(int)
|
||
|
|
{
|
||
|
|
longjmp(s_jmpNoSSE2, 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif // CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
|
||
|
|
|
||
|
|
bool CPU_ProbeSSE2()
|
||
|
|
{
|
||
|
|
// Apple switched to Intel desktops in 2005/2006 using
|
||
|
|
// Core2 Duo's, which provides SSE2 and above.
|
||
|
|
#if CRYPTOPP_BOOL_X64 || defined(__APPLE__)
|
||
|
|
return true;
|
||
|
|
#elif defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
|
||
|
|
return false;
|
||
|
|
#elif defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
|
||
|
|
__try
|
||
|
|
{
|
||
|
|
# if CRYPTOPP_SSE2_ASM_AVAILABLE
|
||
|
|
AS2(por xmm0, xmm0) // executing SSE2 instruction
|
||
|
|
# elif CRYPTOPP_SSE2_INTRIN_AVAILABLE
|
||
|
|
__m128i x = _mm_setzero_si128();
|
||
|
|
return _mm_cvtsi128_si32(x) == 0;
|
||
|
|
# endif
|
||
|
|
}
|
||
|
|
// GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION
|
||
|
|
__except (EXCEPTION_EXECUTE_HANDLER)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
#else
|
||
|
|
// longjmp and clobber warnings. Volatile is required.
|
||
|
|
// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
|
||
|
|
volatile bool result = true;
|
||
|
|
|
||
|
|
volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
|
||
|
|
if (oldHandler == SIG_ERR)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
# ifndef __MINGW32__
|
||
|
|
volatile sigset_t oldMask;
|
||
|
|
if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
|
||
|
|
{
|
||
|
|
signal(SIGILL, oldHandler);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
# endif
|
||
|
|
|
||
|
|
if (setjmp(s_jmpNoSSE2))
|
||
|
|
result = false;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
# if CRYPTOPP_SSE2_ASM_AVAILABLE
|
||
|
|
__asm __volatile ("por %xmm0, %xmm0");
|
||
|
|
# elif CRYPTOPP_SSE2_INTRIN_AVAILABLE
|
||
|
|
__m128i x = _mm_setzero_si128();
|
||
|
|
result = _mm_cvtsi128_si32(x) == 0;
|
||
|
|
# endif
|
||
|
|
}
|
||
|
|
|
||
|
|
# ifndef __MINGW32__
|
||
|
|
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
|
||
|
|
# endif
|
||
|
|
|
||
|
|
signal(SIGILL, oldHandler);
|
||
|
|
return result;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
NAMESPACE_END
|