-rw-r--r-- 15826 libntruprime-20241021/crypto_decode/1277x2627/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[639],R2[320],R3[160],R4[80],R5[40],R6[20],R7[10],R8[5],R9[3],R10[2],R11[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(a1,16)-mulhi(mullo(a1,1986),264);
  a1 += *--s; /* -132...387 */
  a1 -= 264; /* -396...123 */
  a1 += 264&crypto_int16_negative_mask(a1); /* -132...263 */
  a1 += 264&crypto_int16_negative_mask(a1); /* 0...263 */
  R11[0] = a1;
  
  /* R11 ------> R10: reconstruct mod 1*[7744]+[2229] */
  
  i = 0;
  s -= 2;
  a2 = a0 = R11[0];
  a0 = mulhi(a0,3712)-mulhi(mullo(a0,-2166),7744); /* -3872...4800 */
  a0 += s[2*i+1]; /* -3872...5055 */
  a0 = mulhi(a0,3712)-mulhi(mullo(a0,-2166),7744); /* -4092...4158 */
  a0 += s[2*i+0]; /* -4092...4413 */
  a0 += 7744&crypto_int16_negative_mask(a0); /* 0...7743 */
  a1 = (a2<<10)+(s[2*i+1]<<2)+((s[2*i]-a0)>>6);
  a1 = mullo(a1,27081);

  /* invalid inputs might need reduction mod 2229 */
  a1 -= 2229;
  a1 += 2229&crypto_int16_negative_mask(a1);

  R10[0] = a0;
  R10[1] = a1;
  s -= 0;
  
  /* R10 ------> R9: reconstruct mod 2*[1408]+[2229] */
  
  R9[2] = R10[1];
  s -= 1;
  for (i = 0;i >= 0;--i) {
    a2 = a0 = R10[i];
    a0 = mulhi(a0,-512)-mulhi(mullo(a0,-11916),1408); /* -832...704 */
    a0 += s[1*i+0]; /* -832...959 */
    a0 += 1408&crypto_int16_negative_mask(a0); /* 0...1407 */
    a1 = (a2<<1)+((s[i]-a0)>>7);
    a1 = mullo(a1,-29789);

    /* invalid inputs might need reduction mod 1408 */
    a1 -= 1408;
    a1 += 1408&crypto_int16_negative_mask(a1);

    R9[2*i] = a0;
    R9[2*i+1] = a1;
  }
  
  /* R9 ------> R8: reconstruct mod 4*[9604]+[2229] */
  
  R8[4] = R9[2];
  s -= 4;
  for (i = 1;i >= 0;--i) {
    a2 = a0 = R9[i];
    a0 = mulhi(a0,-972)-mulhi(mullo(a0,-1747),9604); /* -5045...4802 */
    a0 += s[2*i+1]; /* -5045...5057 */
    a0 = mulhi(a0,-972)-mulhi(mullo(a0,-1747),9604); /* -4878...4876 */
    a0 += s[2*i+0]; /* -4878...5131 */
    a0 += 9604&crypto_int16_negative_mask(a0); /* 0...9603 */
    a1 = (a2<<14)+(s[2*i+1]<<6)+((s[2*i]-a0)>>2);
    a1 = mullo(a1,23201);

    /* invalid inputs might need reduction mod 9604 */
    a1 -= 9604;
    a1 += 9604&crypto_int16_negative_mask(a1);

    R8[2*i] = a0;
    R8[2*i+1] = a1;
  }
  
  /* R8 ------> R7: reconstruct mod 9*[98]+[5822] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R8[4];
  a0 = mulhi(a0,8)-mulhi(mullo(a0,25412),98); /* -49...51 */
  a0 += s[1*i+0]; /* -49...306 */
  a0 = mulhi(a0,-26)-mulhi(mullo(a0,-669),98); /* -50...49 */
  a0 += 98&crypto_int16_negative_mask(a0); /* 0...97 */
  a1 = (a2<<7)+((s[i]-a0)>>1);
  a1 = mullo(a1,22737);

  /* invalid inputs might need reduction mod 5822 */
  a1 -= 5822;
  a1 += 5822&crypto_int16_negative_mask(a1);

  R7[8] = a0;
  R7[9] = a1;
  s -= 0;
  for (i = 3;i >= 0;--i) {
    a2 = a0 = R8[i];
    a0 = mulhi(a0,-26)-mulhi(mullo(a0,-669),98); /* -56...49 */
    a0 += 98&crypto_int16_negative_mask(a0); /* 0...97 */
    a1 = (a2-a0)>>1;
    a1 = mullo(a1,22737);

    /* invalid inputs might need reduction mod 98 */
    a1 -= 98;
    a1 += 98&crypto_int16_negative_mask(a1);

    R7[2*i] = a0;
    R7[2*i+1] = a1;
  }
  
  /* R7 ------> R6: reconstruct mod 19*[158]+[9433] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R7[9];
  a0 = mulhi(a0,-14)-mulhi(mullo(a0,24887),158); /* -83...79 */
  a0 += s[1*i+0]; /* -83...334 */
  a0 = mulhi(a0,-34)-mulhi(mullo(a0,-415),158); /* -80...79 */
  a0 += 158&crypto_int16_negative_mask(a0); /* 0...157 */
  a1 = (a2<<7)+((s[i]-a0)>>1);
  a1 = mullo(a1,5807);

  /* invalid inputs might need reduction mod 9433 */
  a1 -= 9433;
  a1 += 9433&crypto_int16_negative_mask(a1);

  R6[18] = a0;
  R6[19] = a1;
  s -= 9;
  for (i = 8;i >= 0;--i) {
    a2 = a0 = R7[i];
    a0 = mulhi(a0,-14)-mulhi(mullo(a0,24887),158); /* -83...79 */
    a0 += s[1*i+0]; /* -83...334 */
    a0 = mulhi(a0,-34)-mulhi(mullo(a0,-415),158); /* -80...79 */
    a0 += 158&crypto_int16_negative_mask(a0); /* 0...157 */
    a1 = (a2<<7)+((s[i]-a0)>>1);
    a1 = mullo(a1,5807);

    /* invalid inputs might need reduction mod 158 */
    a1 -= 158;
    a1 += 158&crypto_int16_negative_mask(a1);

    R6[2*i] = a0;
    R6[2*i+1] = a1;
  }
  
  /* R6 ------> R5: reconstruct mod 39*[3211]+[752] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R6[19];
  a0 = mulhi(a0,-259)-mulhi(mullo(a0,-5225),3211); /* -1671...1605 */
  a0 += s[1*i+0]; /* -1671...1860 */
  a0 += 3211&crypto_int16_negative_mask(a0); /* 0...3210 */
  a1 = (a2<<8)+s[i]-a0;
  a1 = mullo(a1,-1245);

  /* invalid inputs might need reduction mod 752 */
  a1 -= 752;
  a1 += 752&crypto_int16_negative_mask(a1);

  R5[38] = a0;
  R5[39] = a1;
  s -= 38;
  i = 3;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R6[i]);
    S0 = _mm256_loadu_si256((__m256i *) (s+2*i));
    S1 = _mm256_srli_epi16(S0,8);
    S0 &= _mm256_set1_epi16(255);
    A0 = sub(mulhiconst(A0,-259),mulhiconst(mulloconst(A0,-5225),3211)); /* -1671...1605 */
    A0 = add(A0,S1); /* -1671...1860 */
    A0 = sub(mulhiconst(A0,-259),mulhiconst(mulloconst(A0,-5225),3211)); /* -1613...1612 */
    A0 = add(A0,S0); /* -1613...1867 */
    A0 = ifnegaddconst(A0,3211); /* 0...3210 */
    A1 = add(shiftleftconst(S1,8),sub(S0,A0));
    A1 = mulloconst(A1,-1245);

    /* invalid inputs might need reduction mod 3211 */
    A1 = ifgesubconst(A1,3211);

    /* 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 *) (&R5[2*i]),C0);
    _mm256_storeu_si256((__m256i *) (16+&R5[2*i]),C1);
    if (!i) break;
    i = -16-((~15)&-i);
  }
  
  /* R5 ------> R4: reconstruct mod 79*[14506]+[3395] */
  
  i = 0;
  s -= 2;
  a2 = a0 = R5[39];
  a0 = mulhi(a0,-6226)-mulhi(mullo(a0,-1157),14506); /* -8810...7253 */
  a0 += s[2*i+1]; /* -8810...7508 */
  a0 = mulhi(a0,-6226)-mulhi(mullo(a0,-1157),14506); /* -7967...8089 */
  a0 += s[2*i+0]; /* -7967...8344 */
  a0 += 14506&crypto_int16_negative_mask(a0); /* 0...14505 */
  a1 = (a2<<15)+(s[2*i+1]<<7)+((s[2*i]-a0)>>1);
  a1 = mullo(a1,253);

  /* invalid inputs might need reduction mod 3395 */
  a1 -= 3395;
  a1 += 3395&crypto_int16_negative_mask(a1);

  R4[78] = a0;
  R4[79] = a1;
  s -= 78;
  i = 23;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R5[i]);
    S0 = _mm256_loadu_si256((__m256i *) (s+2*i));
    S1 = _mm256_srli_epi16(S0,8);
    S0 &= _mm256_set1_epi16(255);
    A0 = sub(mulhiconst(A0,-6226),mulhiconst(mulloconst(A0,-1157),14506)); /* -8810...7253 */
    A0 = add(A0,S1); /* -8810...7508 */
    A0 = sub(mulhiconst(A0,-6226),mulhiconst(mulloconst(A0,-1157),14506)); /* -7967...8089 */
    A0 = add(A0,S0); /* -7967...8344 */
    A0 = ifnegaddconst(A0,14506); /* 0...14505 */
    A1 = add(add(shiftleftconst(A2,15),shiftleftconst(S1,7)),signedshiftrightconst(sub(S0,A0),1));
    A1 = mulloconst(A1,253);

    /* invalid inputs might need reduction mod 14506 */
    A1 = ifgesubconst(A1,14506);

    /* 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 159*[1927]+[451] */
  
  i = 0;
  s -= 1;
  a2 = a0 = R4[79];
  a0 = mulhi(a0,754)-mulhi(mullo(a0,-8706),1927); /* -964...1152 */
  a0 += s[1*i+0]; /* -964...1407 */
  a0 += 1927&crypto_int16_negative_mask(a0); /* 0...1926 */
  a1 = (a2<<8)+s[i]-a0;
  a1 = mullo(a1,3639);

  /* invalid inputs might need reduction mod 451 */
  a1 -= 451;
  a1 += 451&crypto_int16_negative_mask(a1);

  R3[158] = a0;
  R3[159] = a1;
  s -= 79;
  i = 63;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R4[i]);
    S0 = _mm256_cvtepu8_epi16(_mm_loadu_si128((__m128i *) (s+i)));
    A0 = sub(mulhiconst(A0,754),mulhiconst(mulloconst(A0,-8706),1927)); /* -964...1152 */
    A0 = add(A0,S0); /* -964...1407 */
    A0 = ifnegaddconst(A0,1927); /* 0...1926 */
    A1 = add(shiftleftconst(A2,8),sub(S0,A0));
    A1 = mulloconst(A1,3639);

    /* invalid inputs might need reduction mod 1927 */
    A1 = ifgesubconst(A1,1927);

    /* 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 319*[11236]+[2627] */
  
  i = 0;
  s -= 2;
  a2 = a0 = R3[159];
  a0 = mulhi(a0,1868)-mulhi(mullo(a0,-1493),11236); /* -5618...6085 */
  a0 += s[2*i+1]; /* -5618...6340 */
  a0 = mulhi(a0,1868)-mulhi(mullo(a0,-1493),11236); /* -5779...5798 */
  a0 += s[2*i+0]; /* -5779...6053 */
  a0 += 11236&crypto_int16_negative_mask(a0); /* 0...11235 */
  a1 = (a2<<14)+(s[2*i+1]<<6)+((s[2*i]-a0)>>2);
  a1 = mullo(a1,-26807);

  /* invalid inputs might need reduction mod 2627 */
  a1 -= 2627;
  a1 += 2627&crypto_int16_negative_mask(a1);

  R2[318] = a0;
  R2[319] = a1;
  s -= 318;
  i = 143;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R3[i]);
    S0 = _mm256_loadu_si256((__m256i *) (s+2*i));
    S1 = _mm256_srli_epi16(S0,8);
    S0 &= _mm256_set1_epi16(255);
    A0 = sub(mulhiconst(A0,1868),mulhiconst(mulloconst(A0,-1493),11236)); /* -5618...6085 */
    A0 = add(A0,S1); /* -5618...6340 */
    A0 = sub(mulhiconst(A0,1868),mulhiconst(mulloconst(A0,-1493),11236)); /* -5779...5798 */
    A0 = add(A0,S0); /* -5779...6053 */
    A0 = ifnegaddconst(A0,11236); /* 0...11235 */
    A1 = add(add(shiftleftconst(A2,14),shiftleftconst(S1,6)),signedshiftrightconst(sub(S0,A0),2));
    A1 = mulloconst(A1,-26807);

    /* invalid inputs might need reduction mod 11236 */
    A1 = ifgesubconst(A1,11236);

    /* 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 638*[106]+[2627] */
  
  R1[638] = R2[319];
  s -= 0;
  i = 303;
  for (;;) {
    A2 = A0 = _mm256_loadu_si256((__m256i *) &R2[i]);
    A0 = sub(mulhiconst(A0,28),mulhiconst(mulloconst(A0,-618),106)); /* -53...60 */
    A0 = ifnegaddconst(A0,106); /* 0...105 */
    A1 = signedshiftrightconst(sub(A2,A0),1);
    A1 = mulloconst(A1,21021);

    /* invalid inputs might need reduction mod 106 */
    A1 = ifgesubconst(A1,106);

    /* 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 1277*[2627] */
  
  R0[1276] = 3*R1[638]-3939;
  s -= 1276;
  i = 622;
  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(A0,1194),mulhiconst(mulloconst(A0,-6386),2627)); /* -1314...1612 */
    A0 = add(A0,S1); /* -1314...1867 */
    A0 = sub(mulhiconst(A0,1194),mulhiconst(mulloconst(A0,-6386),2627)); /* -1338...1347 */
    A0 = add(A0,S0); /* -1338...1602 */
    A0 = ifnegaddconst(A0,2627); /* 0...2626 */
    A1 = add(shiftleftconst(S1,8),sub(S0,A0));
    A1 = mulloconst(A1,4715);

    /* invalid inputs might need reduction mod 2627 */
    A1 = ifgesubconst(A1,2627);

    A0 = mulloconst(A0,3);
    A1 = mulloconst(A1,3);
    A0 = subconst(A0,3939);
    A1 = subconst(A1,3939);
    /* 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);
  }
}