/*
 *  Copyright 2012 The LibYuv Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS. All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "libyuv/basic_types.h"

#include "libyuv/compare_row.h"
#include "libyuv/row.h"

#ifdef __cplusplus
namespace libyuv {
extern "C" {
#endif

// This module is for GCC x86 and x64.
#if !defined(LIBYUV_DISABLE_X86) && \
    (defined(__x86_64__) || (defined(__i386__) && !defined(_MSC_VER)))

#if defined(__x86_64__)
uint32_t HammingDistance_SSE42(const uint8_t* src_a,
                               const uint8_t* src_b,
                               int count) {
  uint64_t diff = 0u;

  asm volatile(
      "xor         %3,%3                         \n"
      "xor         %%r8,%%r8                     \n"
      "xor         %%r9,%%r9                     \n"
      "xor         %%r10,%%r10                   \n"

      // Process 32 bytes per loop.
      LABELALIGN
      "1:                                        \n"
      "mov         (%0),%%rcx                    \n"
      "mov         0x8(%0),%%rdx                 \n"
      "xor         (%1),%%rcx                    \n"
      "xor         0x8(%1),%%rdx                 \n"
      "popcnt      %%rcx,%%rcx                   \n"
      "popcnt      %%rdx,%%rdx                   \n"
      "mov         0x10(%0),%%rsi                \n"
      "mov         0x18(%0),%%rdi                \n"
      "xor         0x10(%1),%%rsi                \n"
      "xor         0x18(%1),%%rdi                \n"
      "popcnt      %%rsi,%%rsi                   \n"
      "popcnt      %%rdi,%%rdi                   \n"
      "add         $0x20,%0                      \n"
      "add         $0x20,%1                      \n"
      "add         %%rcx,%3                      \n"
      "add         %%rdx,%%r8                    \n"
      "add         %%rsi,%%r9                    \n"
      "add         %%rdi,%%r10                   \n"
      "sub         $0x20,%2                      \n"
      "jg          1b                            \n"

      "add         %%r8, %3                      \n"
      "add         %%r9, %3                      \n"
      "add         %%r10, %3                     \n"
      : "+r"(src_a),  // %0
        "+r"(src_b),  // %1
        "+r"(count),  // %2
        "=r"(diff)    // %3
      :
      : "memory", "cc", "rcx", "rdx", "rsi", "rdi", "r8", "r9", "r10");

  return static_cast<uint32_t>(diff);
}
#else
uint32_t HammingDistance_SSE42(const uint8_t* src_a,
                               const uint8_t* src_b,
                               int count) {
  uint32_t diff = 0u;

  asm volatile(
      // Process 16 bytes per loop.
      LABELALIGN
      "1:                                        \n"
      "mov         (%0),%%ecx                    \n"
      "mov         0x4(%0),%%edx                 \n"
      "xor         (%1),%%ecx                    \n"
      "xor         0x4(%1),%%edx                 \n"
      "popcnt      %%ecx,%%ecx                   \n"
      "add         %%ecx,%3                      \n"
      "popcnt      %%edx,%%edx                   \n"
      "add         %%edx,%3                      \n"
      "mov         0x8(%0),%%ecx                 \n"
      "mov         0xc(%0),%%edx                 \n"
      "xor         0x8(%1),%%ecx                 \n"
      "xor         0xc(%1),%%edx                 \n"
      "popcnt      %%ecx,%%ecx                   \n"
      "add         %%ecx,%3                      \n"
      "popcnt      %%edx,%%edx                   \n"
      "add         %%edx,%3                      \n"
      "add         $0x10,%0                      \n"
      "add         $0x10,%1                      \n"
      "sub         $0x10,%2                      \n"
      "jg          1b                            \n"
      : "+r"(src_a),  // %0
        "+r"(src_b),  // %1
        "+r"(count),  // %2
        "+r"(diff)    // %3
      :
      : "memory", "cc", "ecx", "edx");

  return diff;
}
#endif

static const vec8 kNibbleMask = {15, 15, 15, 15, 15, 15, 15, 15,
                                 15, 15, 15, 15, 15, 15, 15, 15};
static const vec8 kBitCount = {0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

uint32_t HammingDistance_SSSE3(const uint8_t* src_a,
                               const uint8_t* src_b,
                               int count) {
  uint32_t diff = 0u;

  asm volatile(
      "movdqa      %4,%%xmm2                     \n"
      "movdqa      %5,%%xmm3                     \n"
      "pxor        %%xmm0,%%xmm0                 \n"
      "pxor        %%xmm1,%%xmm1                 \n"
      "sub         %0,%1                         \n"

      LABELALIGN
      "1:                                        \n"
      "movdqa      (%0),%%xmm4                   \n"
      "movdqa      0x10(%0), %%xmm5              \n"
      "pxor        (%0,%1), %%xmm4               \n"
      "movdqa      %%xmm4,%%xmm6                 \n"
      "pand        %%xmm2,%%xmm6                 \n"
      "psrlw       $0x4,%%xmm4                   \n"
      "movdqa      %%xmm3,%%xmm7                 \n"
      "pshufb      %%xmm6,%%xmm7                 \n"
      "pand        %%xmm2,%%xmm4                 \n"
      "movdqa      %%xmm3,%%xmm6                 \n"
      "pshufb      %%xmm4,%%xmm6                 \n"
      "paddb       %%xmm7,%%xmm6                 \n"
      "pxor        0x10(%0,%1),%%xmm5            \n"
      "add         $0x20,%0                      \n"
      "movdqa      %%xmm5,%%xmm4                 \n"
      "pand        %%xmm2,%%xmm5                 \n"
      "psrlw       $0x4,%%xmm4                   \n"
      "movdqa      %%xmm3,%%xmm7                 \n"
      "pshufb      %%xmm5,%%xmm7                 \n"
      "pand        %%xmm2,%%xmm4                 \n"
      "movdqa      %%xmm3,%%xmm5                 \n"
      "pshufb      %%xmm4,%%xmm5                 \n"
      "paddb       %%xmm7,%%xmm5                 \n"
      "paddb       %%xmm5,%%xmm6                 \n"
      "psadbw      %%xmm1,%%xmm6                 \n"
      "paddd       %%xmm6,%%xmm0                 \n"
      "sub         $0x20,%2                      \n"
      "jg          1b                            \n"

      "pshufd      $0xaa,%%xmm0,%%xmm1           \n"
      "paddd       %%xmm1,%%xmm0                 \n"
      "movd        %%xmm0, %3                    \n"
      : "+r"(src_a),       // %0
        "+r"(src_b),       // %1
        "+r"(count),       // %2
        "=r"(diff)         // %3
      : "m"(kNibbleMask),  // %4
        "m"(kBitCount)     // %5
      : "memory", "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6",
        "xmm7");

  return diff;
}

#ifdef HAS_HAMMINGDISTANCE_AVX2
uint32_t HammingDistance_AVX2(const uint8_t* src_a,
                              const uint8_t* src_b,
                              int count) {
  uint32_t diff = 0u;

  asm volatile(
      "vbroadcastf128 %4,%%ymm2                  \n"
      "vbroadcastf128 %5,%%ymm3                  \n"
      "vpxor       %%ymm0,%%ymm0,%%ymm0          \n"
      "vpxor       %%ymm1,%%ymm1,%%ymm1          \n"
      "sub         %0,%1                         \n"

      LABELALIGN
      "1:                                        \n"
      "vmovdqa     (%0),%%ymm4                   \n"
      "vmovdqa     0x20(%0), %%ymm5              \n"
      "vpxor       (%0,%1), %%ymm4, %%ymm4       \n"
      "vpand       %%ymm2,%%ymm4,%%ymm6          \n"
      "vpsrlw      $0x4,%%ymm4,%%ymm4            \n"
      "vpshufb     %%ymm6,%%ymm3,%%ymm6          \n"
      "vpand       %%ymm2,%%ymm4,%%ymm4          \n"
      "vpshufb     %%ymm4,%%ymm3,%%ymm4          \n"
      "vpaddb      %%ymm4,%%ymm6,%%ymm6          \n"
      "vpxor       0x20(%0,%1),%%ymm5,%%ymm4     \n"
      "add         $0x40,%0                      \n"
      "vpand       %%ymm2,%%ymm4,%%ymm5          \n"
      "vpsrlw      $0x4,%%ymm4,%%ymm4            \n"
      "vpshufb     %%ymm5,%%ymm3,%%ymm5          \n"
      "vpand       %%ymm2,%%ymm4,%%ymm4          \n"
      "vpshufb     %%ymm4,%%ymm3,%%ymm4          \n"
      "vpaddb      %%ymm5,%%ymm4,%%ymm4          \n"
      "vpaddb      %%ymm6,%%ymm4,%%ymm4          \n"
      "vpsadbw     %%ymm1,%%ymm4,%%ymm4          \n"
      "vpaddd      %%ymm0,%%ymm4,%%ymm0          \n"
      "sub         $0x40,%2                      \n"
      "jg          1b                            \n"

      "vpermq      $0xb1,%%ymm0,%%ymm1           \n"
      "vpaddd      %%ymm1,%%ymm0,%%ymm0          \n"
      "vpermq      $0xaa,%%ymm0,%%ymm1           \n"
      "vpaddd      %%ymm1,%%ymm0,%%ymm0          \n"
      "vmovd       %%xmm0, %3                    \n"
      "vzeroupper                                \n"
      : "+r"(src_a),       // %0
        "+r"(src_b),       // %1
        "+r"(count),       // %2
        "=r"(diff)         // %3
      : "m"(kNibbleMask),  // %4
        "m"(kBitCount)     // %5
      : "memory", "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6");

  return diff;
}
#endif  // HAS_HAMMINGDISTANCE_AVX2

uint32_t SumSquareError_SSE2(const uint8_t* src_a,
                             const uint8_t* src_b,
                             int count) {
  uint32_t sse;
  asm volatile(
      "pxor        %%xmm0,%%xmm0                 \n"
      "pxor        %%xmm5,%%xmm5                 \n"

      LABELALIGN
      "1:                                        \n"
      "movdqu      (%0),%%xmm1                   \n"
      "lea         0x10(%0),%0                   \n"
      "movdqu      (%1),%%xmm2                   \n"
      "lea         0x10(%1),%1                   \n"
      "movdqa      %%xmm1,%%xmm3                 \n"
      "psubusb     %%xmm2,%%xmm1                 \n"
      "psubusb     %%xmm3,%%xmm2                 \n"
      "por         %%xmm2,%%xmm1                 \n"
      "movdqa      %%xmm1,%%xmm2                 \n"
      "punpcklbw   %%xmm5,%%xmm1                 \n"
      "punpckhbw   %%xmm5,%%xmm2                 \n"
      "pmaddwd     %%xmm1,%%xmm1                 \n"
      "pmaddwd     %%xmm2,%%xmm2                 \n"
      "paddd       %%xmm1,%%xmm0                 \n"
      "paddd       %%xmm2,%%xmm0                 \n"
      "sub         $0x10,%2                      \n"
      "jg          1b                            \n"

      "pshufd      $0xee,%%xmm0,%%xmm1           \n"
      "paddd       %%xmm1,%%xmm0                 \n"
      "pshufd      $0x1,%%xmm0,%%xmm1            \n"
      "paddd       %%xmm1,%%xmm0                 \n"
      "movd        %%xmm0,%3                     \n"

      : "+r"(src_a),  // %0
        "+r"(src_b),  // %1
        "+r"(count),  // %2
        "=g"(sse)     // %3
        ::"memory",
        "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm5");
  return sse;
}

static const uvec32 kHash16x33 = {0x92d9e201, 0, 0, 0};  // 33 ^ 16
static const uvec32 kHashMul0 = {
    0x0c3525e1,  // 33 ^ 15
    0xa3476dc1,  // 33 ^ 14
    0x3b4039a1,  // 33 ^ 13
    0x4f5f0981,  // 33 ^ 12
};
static const uvec32 kHashMul1 = {
    0x30f35d61,  // 33 ^ 11
    0x855cb541,  // 33 ^ 10
    0x040a9121,  // 33 ^ 9
    0x747c7101,  // 33 ^ 8
};
static const uvec32 kHashMul2 = {
    0xec41d4e1,  // 33 ^ 7
    0x4cfa3cc1,  // 33 ^ 6
    0x025528a1,  // 33 ^ 5
    0x00121881,  // 33 ^ 4
};
static const uvec32 kHashMul3 = {
    0x00008c61,  // 33 ^ 3
    0x00000441,  // 33 ^ 2
    0x00000021,  // 33 ^ 1
    0x00000001,  // 33 ^ 0
};

uint32_t HashDjb2_SSE41(const uint8_t* src, int count, uint32_t seed) {
  uint32_t hash;
  asm volatile(
      "movd        %2,%%xmm0                     \n"
      "pxor        %%xmm7,%%xmm7                 \n"
      "movdqa      %4,%%xmm6                     \n"

      LABELALIGN
      "1:                                        \n"
      "movdqu      (%0),%%xmm1                   \n"
      "lea         0x10(%0),%0                   \n"
      "pmulld      %%xmm6,%%xmm0                 \n"
      "movdqa      %5,%%xmm5                     \n"
      "movdqa      %%xmm1,%%xmm2                 \n"
      "punpcklbw   %%xmm7,%%xmm2                 \n"
      "movdqa      %%xmm2,%%xmm3                 \n"
      "punpcklwd   %%xmm7,%%xmm3                 \n"
      "pmulld      %%xmm5,%%xmm3                 \n"
      "movdqa      %6,%%xmm5                     \n"
      "movdqa      %%xmm2,%%xmm4                 \n"
      "punpckhwd   %%xmm7,%%xmm4                 \n"
      "pmulld      %%xmm5,%%xmm4                 \n"
      "movdqa      %7,%%xmm5                     \n"
      "punpckhbw   %%xmm7,%%xmm1                 \n"
      "movdqa      %%xmm1,%%xmm2                 \n"
      "punpcklwd   %%xmm7,%%xmm2                 \n"
      "pmulld      %%xmm5,%%xmm2                 \n"
      "movdqa      %8,%%xmm5                     \n"
      "punpckhwd   %%xmm7,%%xmm1                 \n"
      "pmulld      %%xmm5,%%xmm1                 \n"
      "paddd       %%xmm4,%%xmm3                 \n"
      "paddd       %%xmm2,%%xmm1                 \n"
      "paddd       %%xmm3,%%xmm1                 \n"
      "pshufd      $0xe,%%xmm1,%%xmm2            \n"
      "paddd       %%xmm2,%%xmm1                 \n"
      "pshufd      $0x1,%%xmm1,%%xmm2            \n"
      "paddd       %%xmm2,%%xmm1                 \n"
      "paddd       %%xmm1,%%xmm0                 \n"
      "sub         $0x10,%1                      \n"
      "jg          1b                            \n"
      "movd        %%xmm0,%3                     \n"
      : "+r"(src),        // %0
        "+r"(count),      // %1
        "+rm"(seed),      // %2
        "=g"(hash)        // %3
      : "m"(kHash16x33),  // %4
        "m"(kHashMul0),   // %5
        "m"(kHashMul1),   // %6
        "m"(kHashMul2),   // %7
        "m"(kHashMul3)    // %8
      : "memory", "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6",
        "xmm7");
  return hash;
}
#endif  // defined(__x86_64__) || (defined(__i386__) && !defined(__pic__)))

#ifdef __cplusplus
}  // extern "C"
}  // namespace libyuv
#endif