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/******************************************************************************\
* Copyright (c) 2016, Robert van Engelen, Genivia Inc. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions are met: *
* *
* (1) Redistributions of source code must retain the above copyright notice, *
* this list of conditions and the following disclaimer. *
* *
* (2) Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* *
* (3) The name of the author may not be used to endorse or promote products *
* derived from this software without specific prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO *
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, *
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR *
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
\******************************************************************************/
/**
@file simd.h
@brief RE/flex SIMD primitives
@author Robert van Engelen - engelen@genivia.com
@copyright (c) 2016-2024, Robert van Engelen, Genivia Inc. All rights reserved.
@copyright (c) BSD-3 License - see LICENSE.txt
*/
#ifndef SIMD_H
#define SIMD_H
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#if defined(HAVE_AVX512BW)
# include <immintrin.h>
#elif defined(HAVE_AVX2)
# include <immintrin.h>
#elif defined(HAVE_SSE2)
# include <emmintrin.h>
#elif defined(HAVE_NEON)
# include <arm_neon.h>
# if defined(__ARM_ACLE)
# include <arm_acle.h>
# endif
#endif
#if defined(HAVE_AVX512BW) || defined(HAVE_AVX2) || defined(HAVE_SSE2)
#ifdef _MSC_VER
# include <intrin.h>
#endif
#ifdef _MSC_VER
# define cpuidex __cpuidex
#else
# ifndef __cpuid_count
# include <cpuid.h>
# endif
# define cpuidex(CPUInfo, id, subid) __cpuid_count(id, subid, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3])
#endif
namespace reflex {
// HW id
extern uint64_t HW;
// do we have AVX512BW?
inline bool have_HW_AVX512BW()
{
return HW & (1ULL << 62);
}
// do we have AVX2?
inline bool have_HW_AVX2()
{
return HW & (1ULL << 37);
}
// do we have SSE2?
inline bool have_HW_SSE2()
{
return HW & (1ULL << 26);
}
// support hyperthreading?
inline bool have_HW_HTT()
{
return HW & (1ULL << 28);
}
#ifdef _MSC_VER
#pragma intrinsic(_BitScanForward)
inline uint32_t ctz(uint32_t x)
{
unsigned long r;
_BitScanForward(&r, x);
return r;
}
inline uint32_t popcount(uint32_t x)
{
return __popcnt(x);
}
#ifdef _WIN64
#pragma intrinsic(_BitScanForward64)
inline uint32_t ctzl(uint64_t x)
{
unsigned long r;
_BitScanForward64(&r, x);
return r;
}
inline uint32_t popcountl(uint64_t x)
{
return static_cast<uint32_t>(__popcnt64(x));
}
#endif
#else
inline uint32_t ctz(uint32_t x)
{
return __builtin_ctz(x);
}
inline uint32_t ctzl(uint64_t x)
{
return __builtin_ctzl(x);
}
inline uint32_t popcount(uint32_t x)
{
return __builtin_popcount(x);
}
inline uint32_t popcountl(uint64_t x)
{
return __builtin_popcountl(x);
}
#endif
// Partially count newlines in string b up to e, updates b close to e with uncounted part
extern size_t simd_nlcount_avx2(const char *& b, const char *e);
extern size_t simd_nlcount_avx512bw(const char *& b, const char *e);
// Partially check if valid UTF-8 encoding
extern bool simd_isutf8_avx2(const char *& b, const char *e);
} // namespace reflex
#elif defined(HAVE_NEON)
// If we have hardware clz (but it is rather slow)
#if defined(__ARM_ACLE) && defined(__ARM_FEATURE_CLZ)
inline uint32_t ctz(uint32_t x)
{
return __clz(__rbit(x));
}
inline uint32_t ctzl(uint64_t x)
{
return __clzl(__rbitl(x));
}
#endif
#endif
namespace reflex {
/// Count newlines in string s up to position e in the string
extern size_t nlcount(const char *s, const char *e);
/// Check if valid UTF-8 encoding and does not include a NUL, but accept surrogates and 3/4 byte overlongs
extern bool isutf8(const char *s, const char *e);
} // namespace reflex
#endif
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