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// crc-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 ARMv7a and
// ARMv8a NEON instructions. A separate source file is needed
// because additional CXXFLAGS are required to enable the
// appropriate instructions sets in some build configurations.
#include "pch.h"
#include "config.h"
#include "stdcpp.h"
#if !(defined(__ARM_NEON) || defined(_MSC_VER))
# undef CRYPTOPP_ARM_NEON_AVAILABLE
#endif
#if (CRYPTOPP_ARM_NEON_AVAILABLE)
# include <arm_neon.h>
#endif
#if defined(CRYPTOPP_ARM_ACLE_AVAILABLE)
# include <arm_acle.h>
#endif
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
# include <signal.h>
# include <setjmp.h>
#endif
#ifndef EXCEPTION_EXECUTE_HANDLER
# define EXCEPTION_EXECUTE_HANDLER 1
#endif
NAMESPACE_BEGIN(CryptoPP)
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
extern "C" {
typedef void (*SigHandler)(int);
static jmp_buf s_jmpSIGILL;
static void SigIllHandler(int)
{
longjmp(s_jmpSIGILL, 1);
}
};
#endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
bool CPU_ProbeNEON()
{
#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
return false;
#elif (CRYPTOPP_ARM_NEON_AVAILABLE)
# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
volatile bool result = true;
__try
{
uint32_t v1[4] = {1,1,1,1};
uint32x4_t x1 = vld1q_u32(v1);
uint64_t v2[2] = {1,1};
uint64x2_t x2 = vld1q_u64(v2);
uint32x4_t x3 = vdupq_n_u32(2);
x3 = vsetq_lane_u32(vgetq_lane_u32(x1,0),x3,0);
x3 = vsetq_lane_u32(vgetq_lane_u32(x1,3),x3,3);
uint64x2_t x4 = vdupq_n_u64(2);
x4 = vsetq_lane_u64(vgetq_lane_u64(x2,0),x4,0);
x4 = vsetq_lane_u64(vgetq_lane_u64(x2,1),x4,1);
result = !!(vgetq_lane_u32(x3,0) | vgetq_lane_u64(x4,1));
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
return false;
}
return result;
# 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;
volatile sigset_t oldMask;
if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
return false;
if (setjmp(s_jmpSIGILL))
result = false;
else
{
uint32_t v1[4] = {1,1,1,1};
uint32x4_t x1 = vld1q_u32(v1);
uint64_t v2[2] = {1,1};
uint64x2_t x2 = vld1q_u64(v2);
uint32x4_t x3 = {0,0,0,0};
x3 = vsetq_lane_u32(vgetq_lane_u32(x1,0),x3,0);
x3 = vsetq_lane_u32(vgetq_lane_u32(x1,3),x3,3);
uint64x2_t x4 = {0,0};
x4 = vsetq_lane_u64(vgetq_lane_u64(x2,0),x4,0);
x4 = vsetq_lane_u64(vgetq_lane_u64(x2,1),x4,1);
// Hack... GCC optimizes away the code and returns true
result = !!(vgetq_lane_u32(x3,0) | vgetq_lane_u64(x4,1));
}
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
signal(SIGILL, oldHandler);
return result;
# endif
#else
return false;
#endif // CRYPTOPP_ARM_NEON_AVAILABLE
}
NAMESPACE_END
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