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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 SSE4.2 and
// ARMv8a CRC-32 and CRC-32C 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 "misc.h"
#if (CRYPTOPP_SSE42_AVAILABLE)
# include <nmmintrin.h>
#endif
#if (CRYPTOPP_ARM_NEON_HEADER)
# include <arm_neon.h>
#endif
#if (CRYPTOPP_ARM_ACLE_HEADER)
# include <stdint.h>
# 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
// Squash MS LNK4221 and libtool warnings
extern const char CRC_SIMD_FNAME[] = __FILE__;
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
#if (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARMV8)
bool CPU_ProbeCRC32()
{
#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
return false;
#elif (CRYPTOPP_ARM_CRC32_AVAILABLE)
# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
volatile bool result = true;
__try
{
word32 w=0, x=1; word16 y=2; byte z=3;
w = __crc32w(w,x);
w = __crc32h(w,y);
w = __crc32b(w,z);
w = __crc32cw(w,x);
w = __crc32ch(w,y);
w = __crc32cb(w,z);
result = !!w;
}
__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))
{
signal(SIGILL, oldHandler);
return false;
}
if (setjmp(s_jmpSIGILL))
result = false;
else
{
word32 w=0, x=1; word16 y=2; byte z=3;
w = __crc32w(w,x);
w = __crc32h(w,y);
w = __crc32b(w,z);
w = __crc32cw(w,x);
w = __crc32ch(w,y);
w = __crc32cb(w,z);
// Hack... GCC optimizes away the code and returns true
result = !!w;
}
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
signal(SIGILL, oldHandler);
return result;
# endif
#else
return false;
#endif // CRYPTOPP_ARM_CRC32_AVAILABLE
}
#endif // ARM32 or ARM64
#if (CRYPTOPP_ARM_CRC32_AVAILABLE)
void CRC32_Update_ARMV8(const byte *s, size_t n, word32& c)
{
for(; !IsAligned<word32>(s) && n > 0; s++, n--)
c = __crc32b(c, *s);
for(; n > 4; s+=4, n-=4)
c = __crc32w(c, *(const word32 *)(void*)s);
for(; n > 0; s++, n--)
c = __crc32b(c, *s);
}
void CRC32C_Update_ARMV8(const byte *s, size_t n, word32& c)
{
for(; !IsAligned<word32>(s) && n > 0; s++, n--)
c = __crc32cb(c, *s);
for(; n > 4; s+=4, n-=4)
c = __crc32cw(c, *(const word32 *)(void*)s);
for(; n > 0; s++, n--)
c = __crc32cb(c, *s);
}
#endif
#if (CRYPTOPP_SSE42_AVAILABLE)
void CRC32C_Update_SSE42(const byte *s, size_t n, word32& c)
{
for(; !IsAligned<word32>(s) && n > 0; s++, n--)
c = _mm_crc32_u8(c, *s);
for(; n > 4; s+=4, n-=4)
c = _mm_crc32_u32(c, *(const word32 *)(void*)s);
for(; n > 0; s++, n--)
c = _mm_crc32_u8(c, *s);
}
#endif
NAMESPACE_END
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