-rw-r--r-- 13780 libntruprime-20240825/crypto_decode/953x6343/avx/decode.c raw
/* auto-generated; do not edit */
/* 20240812 djb: more cryptoint usage */

#include <immintrin.h>
#include "crypto_decode.h"
#include "crypto_int16.h"
#include "crypto_int32.h"
#define int16 crypto_int16
#define int32 crypto_int32

static inline int16 mullo(int16 x,int16 y)
{
  return x*y;
}

static inline int16 mulhi(int16 x,int16 y)
{
  return (x*(int32)y)>>16;
}

static inline __m256i add(__m256i x,__m256i y)
{
  return _mm256_add_epi16(x,y);
}

static inline __m256i sub(__m256i x,__m256i y)
{
  return _mm256_sub_epi16(x,y);
}

static inline __m256i shiftleftconst(__m256i x,int16 y)
{
  return _mm256_slli_epi16(x,y);
}

static inline __m256i signedshiftrightconst(__m256i x,int16 y)
{
  return _mm256_srai_epi16(x,y);
}

static inline __m256i subconst(__m256i x,int16 y)
{
  return sub(x,_mm256_set1_epi16(y));
}

static inline __m256i mulloconst(__m256i x,int16 y)
{
  return _mm256_mullo_epi16(x,_mm256_set1_epi16(y));
}

static inline __m256i mulhiconst(__m256i x,int16 y)
{
  return _mm256_mulhi_epi16(x,_mm256_set1_epi16(y));
}

static inline __m256i ifgesubconst(__m256i x,int16 y)
{
  __m256i y16 = _mm256_set1_epi16(y);
  __m256i top16 = _mm256_set1_epi16(y-1);
  return sub(x,_mm256_cmpgt_epi16(x,top16) & y16);
}

static inline __m256i ifnegaddconst(__m256i x,int16 y)
{
  return add(x,signedshiftrightconst(x,15) & _mm256_set1_epi16(y));
}

void crypto_decode(void *v,const unsigned char *s)
{
  int16 *R0 = v;
  int16 R1[477],R2[239],R3[120],R4[60],R5[30],R6[15],R7[8],R8[4],R9[2],R10[1];
  long long i;
  int16 a0,a1,a2;
  __m256i A0,A1,A2,S0,S1,B0,B1,C0,C1;
  
  s += crypto_decode_STRBYTES;
  a1 = 0;
  a1 += *--s; /* 0...255 */
  a1 = mulhi(a1,-272)-mulhi(mullo(a1,-1336),12558);
  a1 += *--s; /* -6279...6532 */
  a1 += 12558&crypto_int16_negative_mask(a1); /* 0...12557 */
  R10[0] = a1;
  
  /* R10 ------> R9: reconstruct mod 1*[2383]+[1349] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R10[0];
  a0 = mulhi(a0,896)-mulhi(mullo(a0,-7040),2383); /* -1192...1415 */
  a0 += s[1*i+0]; /* -1192...1670 */
  a0 += 2383&crypto_int16_negative_mask(a0); /* 0...2382 */
  a1 = (a2<<8)+s[i]-a0;
  a1 = mullo(a1,28079);

  /* invalid inputs might need reduction mod 1349 */
  a1 -= 1349;
  a1 += 1349&crypto_int16_negative_mask(a1);

  R9[0] = a0;
  R9[1] = a1;
  s -= 0;
  
  /* R9 ------> R8: reconstruct mod 3*[781]+[442] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R9[1];
  a0 = mulhi(a0,-226)-mulhi(mullo(a0,-21482),781); /* -447...390 */
  a0 += s[1*i+0]; /* -447...645 */
  a0 += 781&crypto_int16_negative_mask(a0); /* 0...780 */
  a1 = (a2<<8)+s[i]-a0;
  a1 = mullo(a1,-31803);

  /* invalid inputs might need reduction mod 442 */
  a1 -= 442;
  a1 += 442&crypto_int16_negative_mask(a1);

  R8[2] = a0;
  R8[3] = a1;
  s -= 1;
  for (i = 0;i >= 0;--i) {
    a2 = a0 = R9[i];
    a0 = mulhi(a0,-226)-mulhi(mullo(a0,-21482),781); /* -447...390 */
    a0 += s[1*i+0]; /* -447...645 */
    a0 += 781&crypto_int16_negative_mask(a0); /* 0...780 */
    a1 = (a2<<8)+s[i]-a0;
    a1 = mullo(a1,-31803);

    /* invalid inputs might need reduction mod 781 */
    a1 -= 781;
    a1 += 781&crypto_int16_negative_mask(a1);

    R8[2*i] = a0;
    R8[2*i+1] = a1;
  }
  
  /* R8 ------> R7: reconstruct mod 7*[447]+[253] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R8[3];
  a0 = mulhi(a0,-35)-mulhi(mullo(a0,28003),447); /* -233...223 */
  a0 += s[1*i+0]; /* -233...478 */
  a0 -= 447; /* -680..>31 */
  a0 += 447&crypto_int16_negative_mask(a0); /* -233...446 */
  a0 += 447&crypto_int16_negative_mask(a0); /* 0...446 */
  a1 = (a2<<8)+s[i]-a0;
  a1 = mullo(a1,-4545);

  /* invalid inputs might need reduction mod 253 */
  a1 -= 253;
  a1 += 253&crypto_int16_negative_mask(a1);

  R7[6] = a0;
  R7[7] = a1;
  s -= 3;
  for (i = 2;i >= 0;--i) {
    a2 = a0 = R8[i];
    a0 = mulhi(a0,-35)-mulhi(mullo(a0,28003),447); /* -233...223 */
    a0 += s[1*i+0]; /* -233...478 */
    a0 -= 447; /* -680..>31 */
    a0 += 447&crypto_int16_negative_mask(a0); /* -233...446 */
    a0 += 447&crypto_int16_negative_mask(a0); /* 0...446 */
    a1 = (a2<<8)+s[i]-a0;
    a1 = mullo(a1,-4545);

    /* invalid inputs might need reduction mod 447 */
    a1 -= 447;
    a1 += 447&crypto_int16_negative_mask(a1);

    R7[2*i] = a0;
    R7[2*i+1] = a1;
  }
  
  /* R7 ------> R6: reconstruct mod 14*[338]+[253] */
  
  R6[14] = R7[7];
  s -= 7;
  for (i = 6;i >= 0;--i) {
    a2 = a0 = R7[i];
    a0 = mulhi(a0,-90)-mulhi(mullo(a0,15899),338); /* -192...169 */
    a0 += s[1*i+0]; /* -192...424 */
    a0 -= 338; /* -530..>86 */
    a0 += 338&crypto_int16_negative_mask(a0); /* -192...337 */
    a0 += 338&crypto_int16_negative_mask(a0); /* 0...337 */
    a1 = (a2<<7)+((s[i]-a0)>>1);
    a1 = mullo(a1,-23655);

    /* invalid inputs might need reduction mod 338 */
    a1 -= 338;
    a1 += 338&crypto_int16_negative_mask(a1);

    R6[2*i] = a0;
    R6[2*i+1] = a1;
  }
  
  /* R6 ------> R5: reconstruct mod 29*[4701]+[3519] */
  
  i = 0;
  s -= 2;
  a2 = a0 = R6[14];
  a0 = mulhi(a0,-653)-mulhi(mullo(a0,-3569),4701); /* -2514...2350 */
  a0 += s[2*i+1]; /* -2514...2605 */
  a0 = mulhi(a0,-653)-mulhi(mullo(a0,-3569),4701); /* -2377...2375 */
  a0 += s[2*i+0]; /* -2377...2630 */
  a0 += 4701&crypto_int16_negative_mask(a0); /* 0...4700 */
  a1 = (s[2*i+1]<<8)+s[2*i]-a0;
  a1 = mullo(a1,20981);

  /* invalid inputs might need reduction mod 3519 */
  a1 -= 3519;
  a1 += 3519&crypto_int16_negative_mask(a1);

  R5[28] = a0;
  R5[29] = a1;
  s -= 28;
  for (i = 13;i >= 0;--i) {
    a2 = a0 = R6[i];
    a0 = mulhi(a0,-653)-mulhi(mullo(a0,-3569),4701); /* -2514...2350 */
    a0 += s[2*i+1]; /* -2514...2605 */
    a0 = mulhi(a0,-653)-mulhi(mullo(a0,-3569),4701); /* -2377...2375 */
    a0 += s[2*i+0]; /* -2377...2630 */
    a0 += 4701&crypto_int16_negative_mask(a0); /* 0...4700 */
    a1 = (s[2*i+1]<<8)+s[2*i]-a0;
    a1 = mullo(a1,20981);

    /* invalid inputs might need reduction mod 4701 */
    a1 -= 4701;
    a1 += 4701&crypto_int16_negative_mask(a1);

    R5[2*i] = a0;
    R5[2*i+1] = a1;
  }
  
  /* R5 ------> R4: reconstruct mod 59*[1097]+[821] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R5[29];
  a0 = mulhi(a0,-302)-mulhi(mullo(a0,-15294),1097); /* -624...548 */
  a0 += s[1*i+0]; /* -624...803 */
  a0 += 1097&crypto_int16_negative_mask(a0); /* 0...1096 */
  a1 = (a2<<8)+s[i]-a0;
  a1 = mullo(a1,11769);

  /* invalid inputs might need reduction mod 821 */
  a1 -= 821;
  a1 += 821&crypto_int16_negative_mask(a1);

  R4[58] = a0;
  R4[59] = a1;
  s -= 29;
  i = 13;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R5[i]);
    S0 = _mm256_cvtepu8_epi16(_mm_loadu_si128((__m128i *) (s+i)));
    A0 = sub(mulhiconst(A0,-302),mulhiconst(mulloconst(A0,-15294),1097)); /* -624...548 */
    A0 = add(A0,S0); /* -624...803 */
    A0 = ifnegaddconst(A0,1097); /* 0...1096 */
    A1 = add(shiftleftconst(A2,8),sub(S0,A0));
    A1 = mulloconst(A1,11769);

    /* invalid inputs might need reduction mod 1097 */
    A1 = ifgesubconst(A1,1097);

    /* A0: r0r2r4r6r8r10r12r14 r16r18r20r22r24r26r28r30 */
    /* A1: r1r3r5r7r9r11r13r15 r17r19r21r23r25r27r29r31 */
    B0 = _mm256_unpacklo_epi16(A0,A1);
    B1 = _mm256_unpackhi_epi16(A0,A1);
    /* B0: r0r1r2r3r4r5r6r7 r16r17r18r19r20r21r22r23 */
    /* B1: r8r9r10r11r12r13r14r15 r24r25r26r27r28r29r30r31 */
    C0 = _mm256_permute2x128_si256(B0,B1,0x20);
    C1 = _mm256_permute2x128_si256(B0,B1,0x31);
    /* C0: r0r1r2r3r4r5r6r7 r8r9r10r11r12r13r14r15 */
    /* C1: r16r17r18r19r20r21r22r23 r24r25r26r27r28r29r30r31 */
    _mm256_storeu_si256((__m256i *) (&R4[2*i]),C0);
    _mm256_storeu_si256((__m256i *) (16+&R4[2*i]),C1);
    if (!i) break;
    i = -16-((~15)&-i);
  }
  
  /* R4 ------> R3: reconstruct mod 119*[8476]+[6343] */
  
  i = 0;
  s -= 2;
  a2 = a0 = R4[59];
  a0 = mulhi(a0,3212)-mulhi(mullo(a0,-1979),8476); /* -4238...5041 */
  a0 += s[2*i+1]; /* -4238...5296 */
  a0 = mulhi(a0,3212)-mulhi(mullo(a0,-1979),8476); /* -4446...4497 */
  a0 += s[2*i+0]; /* -4446...4752 */
  a0 += 8476&crypto_int16_negative_mask(a0); /* 0...8475 */
  a1 = (a2<<14)+(s[2*i+1]<<6)+((s[2*i]-a0)>>2);
  a1 = mullo(a1,8567);

  /* invalid inputs might need reduction mod 6343 */
  a1 -= 6343;
  a1 += 6343&crypto_int16_negative_mask(a1);

  R3[118] = a0;
  R3[119] = a1;
  s -= 118;
  i = 43;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R4[i]);
    S0 = _mm256_loadu_si256((__m256i *) (s+2*i));
    S1 = _mm256_srli_epi16(S0,8);
    S0 &= _mm256_set1_epi16(255);
    A0 = sub(mulhiconst(A0,3212),mulhiconst(mulloconst(A0,-1979),8476)); /* -4238...5041 */
    A0 = add(A0,S1); /* -4238...5296 */
    A0 = sub(mulhiconst(A0,3212),mulhiconst(mulloconst(A0,-1979),8476)); /* -4446...4497 */
    A0 = add(A0,S0); /* -4446...4752 */
    A0 = ifnegaddconst(A0,8476); /* 0...8475 */
    A1 = add(add(shiftleftconst(A2,14),shiftleftconst(S1,6)),signedshiftrightconst(sub(S0,A0),2));
    A1 = mulloconst(A1,8567);

    /* invalid inputs might need reduction mod 8476 */
    A1 = ifgesubconst(A1,8476);

    /* A0: r0r2r4r6r8r10r12r14 r16r18r20r22r24r26r28r30 */
    /* A1: r1r3r5r7r9r11r13r15 r17r19r21r23r25r27r29r31 */
    B0 = _mm256_unpacklo_epi16(A0,A1);
    B1 = _mm256_unpackhi_epi16(A0,A1);
    /* B0: r0r1r2r3r4r5r6r7 r16r17r18r19r20r21r22r23 */
    /* B1: r8r9r10r11r12r13r14r15 r24r25r26r27r28r29r30r31 */
    C0 = _mm256_permute2x128_si256(B0,B1,0x20);
    C1 = _mm256_permute2x128_si256(B0,B1,0x31);
    /* C0: r0r1r2r3r4r5r6r7 r8r9r10r11r12r13r14r15 */
    /* C1: r16r17r18r19r20r21r22r23 r24r25r26r27r28r29r30r31 */
    _mm256_storeu_si256((__m256i *) (&R3[2*i]),C0);
    _mm256_storeu_si256((__m256i *) (16+&R3[2*i]),C1);
    if (!i) break;
    i = -16-((~15)&-i);
  }
  
  /* R3 ------> R2: reconstruct mod 238*[1473]+[6343] */
  
  R2[238] = R3[119];
  s -= 119;
  i = 103;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R3[i]);
    S0 = _mm256_cvtepu8_epi16(_mm_loadu_si128((__m128i *) (s+i)));
    A0 = sub(mulhiconst(A0,-254),mulhiconst(mulloconst(A0,-11390),1473)); /* -800...736 */
    A0 = add(A0,S0); /* -800...991 */
    A0 = ifnegaddconst(A0,1473); /* 0...1472 */
    A1 = add(shiftleftconst(A2,8),sub(S0,A0));
    A1 = mulloconst(A1,2625);

    /* invalid inputs might need reduction mod 1473 */
    A1 = ifgesubconst(A1,1473);

    /* A0: r0r2r4r6r8r10r12r14 r16r18r20r22r24r26r28r30 */
    /* A1: r1r3r5r7r9r11r13r15 r17r19r21r23r25r27r29r31 */
    B0 = _mm256_unpacklo_epi16(A0,A1);
    B1 = _mm256_unpackhi_epi16(A0,A1);
    /* B0: r0r1r2r3r4r5r6r7 r16r17r18r19r20r21r22r23 */
    /* B1: r8r9r10r11r12r13r14r15 r24r25r26r27r28r29r30r31 */
    C0 = _mm256_permute2x128_si256(B0,B1,0x20);
    C1 = _mm256_permute2x128_si256(B0,B1,0x31);
    /* C0: r0r1r2r3r4r5r6r7 r8r9r10r11r12r13r14r15 */
    /* C1: r16r17r18r19r20r21r22r23 r24r25r26r27r28r29r30r31 */
    _mm256_storeu_si256((__m256i *) (&R2[2*i]),C0);
    _mm256_storeu_si256((__m256i *) (16+&R2[2*i]),C1);
    if (!i) break;
    i = -16-((~15)&-i);
  }
  
  /* R2 ------> R1: reconstruct mod 476*[614]+[6343] */
  
  R1[476] = R2[238];
  s -= 238;
  i = 222;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R2[i]);
    S0 = _mm256_cvtepu8_epi16(_mm_loadu_si128((__m128i *) (s+i)));
    A0 = sub(mulhiconst(A0,280),mulhiconst(mulloconst(A0,-27324),614)); /* -307...377 */
    A0 = add(A0,S0); /* -307...632 */
    A0 = subconst(A0,614); /* -921...18 */
    A0 = ifnegaddconst(A0,614); /* -307...613 */
    A0 = ifnegaddconst(A0,614); /* 0...613 */
    A1 = add(shiftleftconst(A2,7),signedshiftrightconst(sub(S0,A0),1));
    A1 = mulloconst(A1,-7685);

    /* invalid inputs might need reduction mod 614 */
    A1 = ifgesubconst(A1,614);

    /* A0: r0r2r4r6r8r10r12r14 r16r18r20r22r24r26r28r30 */
    /* A1: r1r3r5r7r9r11r13r15 r17r19r21r23r25r27r29r31 */
    B0 = _mm256_unpacklo_epi16(A0,A1);
    B1 = _mm256_unpackhi_epi16(A0,A1);
    /* B0: r0r1r2r3r4r5r6r7 r16r17r18r19r20r21r22r23 */
    /* B1: r8r9r10r11r12r13r14r15 r24r25r26r27r28r29r30r31 */
    C0 = _mm256_permute2x128_si256(B0,B1,0x20);
    C1 = _mm256_permute2x128_si256(B0,B1,0x31);
    /* C0: r0r1r2r3r4r5r6r7 r8r9r10r11r12r13r14r15 */
    /* C1: r16r17r18r19r20r21r22r23 r24r25r26r27r28r29r30r31 */
    _mm256_storeu_si256((__m256i *) (&R1[2*i]),C0);
    _mm256_storeu_si256((__m256i *) (16+&R1[2*i]),C1);
    if (!i) break;
    i = -16-((~15)&-i);
  }
  
  /* R1 ------> R0: reconstruct mod 953*[6343] */
  
  R0[952] = R1[476]-3171;
  s -= 952;
  i = 460;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R1[i]);
    S0 = _mm256_loadu_si256((__m256i *) (s+2*i));
    S1 = _mm256_srli_epi16(S0,8);
    S0 &= _mm256_set1_epi16(255);
    A0 = sub(mulhiconst(A0,-19),mulhiconst(mulloconst(A0,-2645),6343)); /* -3177...3171 */
    A0 = add(A0,S1); /* -3177...3426 */
    A0 = sub(mulhiconst(A0,-19),mulhiconst(mulloconst(A0,-2645),6343)); /* -3173...3172 */
    A0 = add(A0,S0); /* -3173...3427 */
    A0 = ifnegaddconst(A0,6343); /* 0...6342 */
    A1 = add(shiftleftconst(S1,8),sub(S0,A0));
    A1 = mulloconst(A1,10487);

    /* invalid inputs might need reduction mod 6343 */
    A1 = ifgesubconst(A1,6343);

    A0 = subconst(A0,3171);
    A1 = subconst(A1,3171);
    /* A0: r0r2r4r6r8r10r12r14 r16r18r20r22r24r26r28r30 */
    /* A1: r1r3r5r7r9r11r13r15 r17r19r21r23r25r27r29r31 */
    B0 = _mm256_unpacklo_epi16(A0,A1);
    B1 = _mm256_unpackhi_epi16(A0,A1);
    /* B0: r0r1r2r3r4r5r6r7 r16r17r18r19r20r21r22r23 */
    /* B1: r8r9r10r11r12r13r14r15 r24r25r26r27r28r29r30r31 */
    C0 = _mm256_permute2x128_si256(B0,B1,0x20);
    C1 = _mm256_permute2x128_si256(B0,B1,0x31);
    /* C0: r0r1r2r3r4r5r6r7 r8r9r10r11r12r13r14r15 */
    /* C1: r16r17r18r19r20r21r22r23 r24r25r26r27r28r29r30r31 */
    _mm256_storeu_si256((__m256i *) (&R0[2*i]),C0);
    _mm256_storeu_si256((__m256i *) (16+&R0[2*i]),C1);
    if (!i) break;
    i = -16-((~15)&-i);
  }
}