Merge pull request #511 from negativeExponent/updates

[pcsx_rearmed.git] / deps / lzma-16.04 / C / BraIA64.c

/* BraIA64.c -- Converter for IA-64 code\r
2013-11-12 : Igor Pavlov : Public domain */\r
\r
#include "Precomp.h"\r
\r
#include "Bra.h"\r
\r
static const Byte kBranchTable[32] =\r
{\r
  0, 0, 0, 0, 0, 0, 0, 0,\r
  0, 0, 0, 0, 0, 0, 0, 0,\r
  4, 4, 6, 6, 0, 0, 7, 7,\r
  4, 4, 0, 0, 4, 4, 0, 0\r
};\r
\r
SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)\r
{\r
  SizeT i;\r
  if (size < 16)\r
    return 0;\r
  size -= 16;\r
  for (i = 0; i <= size; i += 16)\r
  {\r
    UInt32 instrTemplate = data[i] & 0x1F;\r
    UInt32 mask = kBranchTable[instrTemplate];\r
    UInt32 bitPos = 5;\r
    int slot;\r
    for (slot = 0; slot < 3; slot++, bitPos += 41)\r
    {\r
      UInt32 bytePos, bitRes;\r
      UInt64 instruction, instNorm;\r
      int j;\r
      if (((mask >> slot) & 1) == 0)\r
        continue;\r
      bytePos = (bitPos >> 3);\r
      bitRes = bitPos & 0x7;\r
      instruction = 0;\r
      for (j = 0; j < 6; j++)\r
        instruction += (UInt64)data[i + j + bytePos] << (8 * j);\r
\r
      instNorm = instruction >> bitRes;\r
      if (((instNorm >> 37) & 0xF) == 0x5 && ((instNorm >> 9) & 0x7) == 0)\r
      {\r
        UInt32 src = (UInt32)((instNorm >> 13) & 0xFFFFF);\r
        UInt32 dest;\r
        src |= ((UInt32)(instNorm >> 36) & 1) << 20;\r
        \r
        src <<= 4;\r
        \r
        if (encoding)\r
          dest = ip + (UInt32)i + src;\r
        else\r
          dest = src - (ip + (UInt32)i);\r
        \r
        dest >>= 4;\r
        \r
        instNorm &= ~((UInt64)(0x8FFFFF) << 13);\r
        instNorm |= ((UInt64)(dest & 0xFFFFF) << 13);\r
        instNorm |= ((UInt64)(dest & 0x100000) << (36 - 20));\r
        \r
        instruction &= (1 << bitRes) - 1;\r
        instruction |= (instNorm << bitRes);\r
        for (j = 0; j < 6; j++)\r
          data[i + j + bytePos] = (Byte)(instruction >> (8 * j));\r
      }\r
    }\r
  }\r
  return i;\r
}\r