ydb/contrib/restricted/turbo_base64/turbob64avx2.c

/**
Copyright (c) 2016-2019, Powturbo
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   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    - homepage : https://sites.google.com/site/powturbo/
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**/
// SSE + AVX2 Based on:
// http://0x80.pl/articles/index.html#base64-algorithm-update
// https://arxiv.org/abs/1704.00605
// https://gist.github.com/aqrit/a2ccea48d7cac7e9d4d99f19d4759666 (decode)

#include <immintrin.h>

#define UA_MEMCPY
#include "conf.h"
#include "turbob64.h"
#include "turbob64_.h"

//--------------------- Decode ----------------------------------------------------------------------
#define MM256_PACK8TO6(v,cpv) {\
  const __m256i merge_ab_and_bc = _mm256_maddubs_epi16(v,            _mm256_set1_epi32(0x01400140));\
                              v = _mm256_madd_epi16(merge_ab_and_bc, _mm256_set1_epi32(0x00011000));\
                              v = _mm256_shuffle_epi8(v, cpv);\
}

#define MM256_MAP8TO6(iv, shifted, delta_asso, delta_values, ov) { /*map 8-bits ascii to 6-bits bin*/\
                shifted    = _mm256_srli_epi32(iv, 3);\
  const __m256i delta_hash = _mm256_avg_epu8(_mm256_shuffle_epi8(delta_asso, iv), shifted);\
                        ov = _mm256_add_epi8(_mm256_shuffle_epi8(delta_values, delta_hash), iv);\
}

#define MM256_B64CHK(iv, shifted, check_asso, check_values, vx) {\
  const __m256i check_hash = _mm256_avg_epu8( _mm256_shuffle_epi8(check_asso, iv), shifted);\
  const __m256i        chk = _mm256_adds_epi8(_mm256_shuffle_epi8(check_values, check_hash), iv);\
                        vx = _mm256_or_si256(vx, chk);\
}

#define OVD 8
size_t tb64avx2dec(const unsigned char *in, size_t inlen, unsigned char *out) {
  if(inlen >= 32+OVD) { 
    const unsigned char *ip;
          unsigned char *op; 
    __m256i vx = _mm256_setzero_si256();
    const __m256i delta_asso   = _mm256_setr_epi8(0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x0f,
                                                  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x0f);
    const __m256i delta_values = _mm256_setr_epi8(0x00, 0x00, 0x00, 0x13, 0x04, 0xbf, 0xbf, 0xb9,   0xb9, 0x00, 0x10, 0xc3, 0xbf, 0xbf, 0xb9, 0xb9,
                                                  0x00, 0x00, 0x00, 0x13, 0x04, 0xbf, 0xbf, 0xb9,   0xb9, 0x00, 0x10, 0xc3, 0xbf, 0xbf, 0xb9, 0xb9);
      #ifndef NB64CHECK
    const __m256i check_asso   = _mm256_setr_epi8(0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x01, 0x01, 0x03, 0x07, 0x0b, 0x0b, 0x0b, 0x0f,
                                                  0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x01, 0x01, 0x03, 0x07, 0x0b, 0x0b, 0x0b, 0x0f);
    const __m256i check_values = _mm256_setr_epi8(0x80, 0x80, 0x80, 0x80, 0xcf, 0xbf, 0xd5, 0xa6,   0xb5, 0x86, 0xd1, 0x80, 0xb1, 0x80, 0x91, 0x80,
                                                  0x80, 0x80, 0x80, 0x80, 0xcf, 0xbf, 0xd5, 0xa6,   0xb5, 0x86, 0xd1, 0x80, 0xb1, 0x80, 0x91, 0x80);
      #endif
          __m256i          cpv = _mm256_set_epi8( -1, -1, -1, -1, 12, 13, 14,  8,    9, 10,  4,  5,  6,  0,  1,  2,
                                                  -1, -1, -1, -1, 12, 13, 14,  8,    9, 10,  4,  5,  6,  0,  1,  2);

    for(ip = in, op = out; ip < (in+inlen)-(64+OVD); ip += 64, op += (64/4)*3) {           
      __m256i          iv0 = _mm256_loadu_si256((__m256i *)ip);    
      __m256i          iv1 = _mm256_loadu_si256((__m256i *)(ip+32)); 
   
      __m256i ov0,shifted0; MM256_MAP8TO6(iv0, shifted0, delta_asso, delta_values, ov0); MM256_PACK8TO6(ov0, cpv);
      __m256i ov1,shifted1; MM256_MAP8TO6(iv1, shifted1, delta_asso, delta_values, ov1); MM256_PACK8TO6(ov1, cpv); PREFETCH(ip,1024,0); 
      
      _mm_storeu_si128((__m128i*) op,       _mm256_castsi256_si128(ov0));
      _mm_storeu_si128((__m128i*)(op + 12), _mm256_extracti128_si256(ov0, 1));                          
      _mm_storeu_si128((__m128i*)(op + 24), _mm256_castsi256_si128(ov1));
      _mm_storeu_si128((__m128i*)(op + 36), _mm256_extracti128_si256(ov1, 1));                         
 
      CHECK0(MM256_B64CHK(iv0, shifted0, check_asso, check_values, vx));
      CHECK1(MM256_B64CHK(iv1, shifted1, delta_asso, delta_values, vx));
    }

    if(ip < (in+inlen)-(32+OVD)) {
      __m256i          iv0 = _mm256_loadu_si256((__m256i *)ip);      
      __m256i ov0,shifted0; MM256_MAP8TO6(iv0, shifted0, delta_asso, delta_values, ov0); MM256_PACK8TO6(ov0, cpv);
      
      _mm_storeu_si128((__m128i*) op,       _mm256_castsi256_si128(ov0));
      _mm_storeu_si128((__m128i*)(op + 12), _mm256_extracti128_si256(ov0, 1));                          
      ip +=  32;
      op += (32/4)*3;
      CHECK1(MM256_B64CHK(iv0, shifted0, check_asso, check_values, vx));
    }
    size_t rc;
    if(!(rc = _tb64xdec(ip, inlen-(ip-in), op)) || _mm256_movemask_epi8(vx)) return 0;
    return (op-out)+rc; 
  }
  return _tb64xdec(in, inlen, out);
}

//-------------------- Encode ----------------------------------------------------------------------
static ALWAYS_INLINE __m256i mm256_map6to8(const __m256i v) { /*map 6-bits bin to 8-bits ascii (https://arxiv.org/abs/1704.00605) */
  __m256i vidx = _mm256_subs_epu8(v,   _mm256_set1_epi8(51));
          vidx = _mm256_sub_epi8(vidx, _mm256_cmpgt_epi8(v, _mm256_set1_epi8(25)));

  const __m256i offsets = _mm256_set_epi8(0, 0, -16, -19, -4, -4, -4, -4,   -4, -4, -4, -4, -4, -4, 71, 65,
                                          0, 0, -16, -19, -4, -4, -4, -4,   -4, -4, -4, -4, -4, -4, 71, 65);
  return _mm256_add_epi8(v, _mm256_shuffle_epi8(offsets, vidx));
}

static ALWAYS_INLINE __m256i mm256_unpack6to8(__m256i v) { /* https://arxiv.org/abs/1704.00605 p.12*/
  __m256i va = _mm256_mulhi_epu16(_mm256_and_si256(v, _mm256_set1_epi32(0x0fc0fc00)), _mm256_set1_epi32(0x04000040));
  __m256i vb = _mm256_mullo_epi16(_mm256_and_si256(v, _mm256_set1_epi32(0x003f03f0)), _mm256_set1_epi32(0x01000010));
  return _mm256_or_si256(va, vb);
}

size_t tb64avx2enc(const unsigned char* in, size_t inlen, unsigned char *out) {
  const unsigned char *ip = in; 
        unsigned char *op = out;
        size_t   outlen = TB64ENCLEN(inlen);
  
  if(outlen >= 32+OVD) {
    const __m256i    shuf = _mm256_set_epi8(10,11, 9,10, 7, 8, 6, 7, 4,   5, 3, 4, 1, 2, 0, 1,
                                            10,11, 9,10, 7, 8, 6, 7, 4,   5, 3, 4, 1, 2, 0, 1);

    for(; op <= (out+outlen)-(64+OVD); op += 64, ip += (64/4)*3) {     								         
      __m256i v0 = _mm256_castsi128_si256(    _mm_loadu_si128((__m128i *) ip));      
              v0 = _mm256_inserti128_si256(v0,_mm_loadu_si128((__m128i *)(ip+12)),1);   
      __m256i v1 = _mm256_castsi128_si256(    _mm_loadu_si128((__m128i *)(ip+24)));      
              v1 = _mm256_inserti128_si256(v1,_mm_loadu_si128((__m128i *)(ip+36)),1);   

      v0 = _mm256_shuffle_epi8(v0, shuf); v0 = mm256_unpack6to8(v0); v0 = mm256_map6to8(v0);                                                                                                           
      v1 = _mm256_shuffle_epi8(v1, shuf); v1 = mm256_unpack6to8(v1); v1 = mm256_map6to8(v1);  PREFETCH(ip, 1024, 0);   

      _mm256_storeu_si256((__m256i*) op,     v0);                                            
      _mm256_storeu_si256((__m256i*)(op+32), v1);    
    }
    if(op <= (out+outlen)-(32+OVD)) {
      __m256i v0 = _mm256_castsi128_si256(    _mm_loadu_si128((__m128i *) ip));      
              v0 = _mm256_inserti128_si256(v0,_mm_loadu_si128((__m128i *)(ip+12)),1);   
      v0 = _mm256_shuffle_epi8(v0, shuf); v0 = mm256_unpack6to8(v0); v0 = mm256_map6to8(v0);                                                                                                           
      _mm256_storeu_si256((__m256i*) op, v0);                                            
      op +=  32; 
      ip += (32/4)*3;
    }
  }
  EXTAIL();
  return outlen;
}

//------- optimized functions for short strings only --------------------------
// can read beyond the input buffer end, 
// therefore input buffer size must be 32 bytes larger than input length

size_t _tb64avx2dec(const unsigned char *in, size_t inlen, unsigned char *out) {
  if(inlen >= 16) { 
    const unsigned char *ip;
          unsigned char *op; 
    const __m256i delta_asso   = _mm256_setr_epi8(0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x0f,
                                                  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x0f);
    const __m256i delta_values = _mm256_setr_epi8(0x00, 0x00, 0x00, 0x13, 0x04, 0xbf, 0xbf, 0xb9,   0xb9, 0x00, 0x10, 0xc3, 0xbf, 0xbf, 0xb9, 0xb9,
                                                  0x00, 0x00, 0x00, 0x13, 0x04, 0xbf, 0xbf, 0xb9,   0xb9, 0x00, 0x10, 0xc3, 0xbf, 0xbf, 0xb9, 0xb9);
      #ifndef NB64CHECK
    const __m256i check_asso   = _mm256_setr_epi8(0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x01, 0x01, 0x03, 0x07, 0x0b, 0x0b, 0x0b, 0x0f,
                                                  0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,   0x01, 0x01, 0x03, 0x07, 0x0b, 0x0b, 0x0b, 0x0f);
    const __m256i check_values = _mm256_setr_epi8(0x80, 0x80, 0x80, 0x80, 0xcf, 0xbf, 0xd5, 0xa6,   0xb5, 0x86, 0xd1, 0x80, 0xb1, 0x80, 0x91, 0x80,
                                                  0x80, 0x80, 0x80, 0x80, 0xcf, 0xbf, 0xd5, 0xa6,   0xb5, 0x86, 0xd1, 0x80, 0xb1, 0x80, 0x91, 0x80);
      #endif
    const __m256i          cpv = _mm256_set_epi8( -1, -1, -1, -1, 12, 13, 14,  8,    9, 10,  4,  5,  6,  0,  1,  2,
                                                  -1, -1, -1, -1, 12, 13, 14,  8,    9, 10,  4,  5,  6,  0,  1,  2);
    __m256i vx = _mm256_setzero_si256();
    for(ip = in, op = out; ip < (in+inlen)-32; ip += 32, op += (32/4)*3) {
      __m256i          iv0 = _mm256_loadu_si256((__m256i *)ip);
      __m256i ov0,shifted0; MM256_MAP8TO6(iv0, shifted0, delta_asso, delta_values, ov0); MM256_PACK8TO6(ov0, cpv);
      
      _mm_storeu_si128((__m128i*) op,       _mm256_castsi256_si128(ov0));
      _mm_storeu_si128((__m128i*)(op + 12), _mm256_extracti128_si256(ov0, 1));                          
      CHECK0(MM256_B64CHK(iv0, shifted0, check_asso, check_values, vx));
    }

    unsigned cx;
    if(ip < (in+inlen)-16) {
      __m128i iv0 = _mm_loadu_si128((__m128i *) ip);
      __m128i _vx = _mm_or_si128(_mm256_extracti128_si256(vx, 1), _mm256_castsi256_si128(vx));
      __m128i ov0, shifted0; MM_MAP8TO6( iv0, shifted0,_mm256_castsi256_si128(delta_asso),_mm256_castsi256_si128(delta_values), ov0); 
	                         MM_PACK8TO6(ov0, _mm256_castsi256_si128(cpv));
      _mm_storeu_si128((__m128i*) op, ov0);  
      ip += 16; op += (16/4)*3;
      CHECK0(MM_B64CHK(iv0, shifted0, _mm256_castsi256_si128(check_asso), _mm256_castsi256_si128(check_values), _vx));
      cx = _mm_movemask_epi8(_vx);
    } else
      cx = _mm256_movemask_epi8(vx);

    size_t rc = _tb64xd(ip, inlen-(ip-in), op);
    if(!rc || cx) return 0;
    return (op-out)+rc;
  }
  return _tb64xd(in, inlen, out);
}

size_t _tb64avx2enc(const unsigned char* in, size_t inlen, unsigned char *out) {
  const unsigned char *ip = in; 
        unsigned char *op = out;
        size_t   outlen = TB64ENCLEN(inlen);
  if(outlen >= 32+4) { 
    const __m256i    shuf = _mm256_set_epi8(10,11, 9,10, 7, 8, 6, 7, 4,   5, 3, 4, 1, 2, 0, 1,
                                            10,11, 9,10, 7, 8, 6, 7, 4,   5, 3, 4, 1, 2, 0, 1);

    for(; op <= (out+outlen)-32; op += 32, ip += (32/4)*3) {
      __m256i v0 = _mm256_castsi128_si256(    _mm_loadu_si128((__m128i *) ip));      
              v0 = _mm256_inserti128_si256(v0,_mm_loadu_si128((__m128i *)(ip+12)),1);   
      v0 = _mm256_shuffle_epi8(v0, shuf); v0 = mm256_unpack6to8(v0); v0 = mm256_map6to8(v0);                                                                                                           
      _mm256_storeu_si256((__m256i*) op,     v0);                                            
    }
  }
  if(op <= (out+outlen)-(16+4)) {
    const __m128i    shuf = _mm_set_epi8(10,11, 9,10, 7, 8, 6, 7, 4,   5, 3, 4, 1, 2, 0, 1);

    __m128i v0 = _mm_loadu_si128((__m128i*)ip);
            v0 = _mm_shuffle_epi8(v0, shuf);
            v0 = mm_unpack6to8(v0);
            v0 = mm_map6to8(v0);
    _mm_storeu_si128((__m128i*) op, v0);                                          
    op += 16; ip += (16/4)*3;
  }
  EXTAIL();
  return outlen;
}