// File: manikandan5[P]Image-Matching-Stitching-Warping/siftpp/sift.cpp
// Function: VL::Sift::computeKeypointDescriptor(float*, VL::Sift::Keypoint, float)
void
Sift::computeKeypointDescriptor
(VL::float_t* descr_pt,
 Keypoint keypoint, 
 VL::float_t angle0)
{

  /* The SIFT descriptor is a  three dimensional histogram of the position
   * and orientation of the gradient.  There are NBP bins for each spatial
   * dimesions and NBO  bins for the orientation dimesion,  for a total of
   * NBP x NBP x NBO bins.
   *
   * The support  of each  spatial bin  has an extension  of SBP  = 3sigma
   * pixels, where sigma is the scale  of the keypoint.  Thus all the bins
   * together have a  support SBP x NBP pixels wide  . Since weighting and
   * interpolation of  pixel is used, another  half bin is  needed at both
   * ends of  the extension. Therefore, we  need a square window  of SBP x
   * (NBP + 1) pixels. Finally, since the patch can be arbitrarly rotated,
   * we need to consider  a window 2W += sqrt(2) x SBP  x (NBP + 1) pixels
   * wide.
   */      

  // octave
  int o = keypoint.o ;
  VL::float_t xperiod = getOctaveSamplingPeriod(o) ;

  // offsets to move in Gaussian scale space octave
  const int ow = getOctaveWidth(o) ;
  const int oh = getOctaveHeight(o) ;
  const int xo = 2 ;
  const int yo = xo * ow ;
  const int so = yo * oh ;

  // keypoint fractional geometry
  VL::float_t x     = keypoint.x / xperiod;
  VL::float_t y     = keypoint.y / xperiod ;
  VL::float_t sigma = keypoint.sigma / xperiod ;

  VL::float_t st0   = sinf( angle0 ) ;
  VL::float_t ct0   = cosf( angle0 ) ;
  
  // shall we use keypoints.ix,iy,is here?
  int xi = ((int) (x+0.5)) ; 
  int yi = ((int) (y+0.5)) ;
  int si = keypoint.is ;

  // const VL::float_t magnif = 3.0f ;
  const int NBO = 8 ;
  const int NBP = 4 ;
  const VL::float_t SBP = magnif * sigma ;
  const int   W = (int) floor (sqrt(2.0) * SBP * (NBP + 1) / 2.0 + 0.5) ;
  
  /* Offsets to move in the descriptor. */
  /* Use Lowe's convention. */
  const int binto = 1 ;
  const int binyo = NBO * NBP ;
  const int binxo = NBO ;
  // const int bino  = NBO * NBP * NBP ;
  
  int bin ;
  
  // check bounds
  if(o  < omin   ||
     o  >=omin+O ||
     xi < 0      || 
     xi > ow-1   || 
     yi < 0      || 
     yi > oh-1   ||
     si < smin+1 ||
     si > smax-2 )
        return ;
  
  // make sure gradient buffer is up-to-date
  prepareGrad(o) ;

  std::fill( descr_pt, descr_pt + NBO*NBP*NBP, 0 ) ;

  /* Center the scale space and the descriptor on the current keypoint. 
   * Note that dpt is pointing to the bin of center (SBP/2,SBP/2,0).
   */
  pixel_t const * pt = temp + xi*xo + yi*yo + (si - smin - 1)*so ;
  VL::float_t *  dpt = descr_pt + (NBP/2) * binyo + (NBP/2) * binxo ;
     
#define atd(dbinx,dbiny,dbint) *(dpt + (dbint)*binto + (dbiny)*binyo + (dbinx)*binxo)
      
  /*
   * Process pixels in the intersection of the image rectangle
   * (1,1)-(M-1,N-1) and the keypoint bounding box.
   */
  for(int dyi = std::max(-W, 1-yi) ; dyi <= std::min(+W, oh-2-yi) ; ++dyi) {
    for(int dxi = std::max(-W, 1-xi) ; dxi <= std::min(+W, ow-2-xi) ; ++dxi) {
      
      // retrieve 
      VL::float_t mod   = *( pt + dxi*xo + dyi*yo + 0 ) ;
      VL::float_t angle = *( pt + dxi*xo + dyi*yo + 1 ) ;
      VL::float_t theta = fast_mod_2pi(-angle + angle0) ; // lowe compatible ?
      
      // fractional displacement
      VL::float_t dx = xi + dxi - x;
      VL::float_t dy = yi + dyi - y;
      
      // get the displacement normalized w.r.t. the keypoint
      // orientation and extension.
      VL::float_t nx = ( ct0 * dx + st0 * dy) / SBP ;
      VL::float_t ny = (-st0 * dx + ct0 * dy) / SBP ; 
      VL::float_t nt = NBO * theta / (2*M_PI) ;
      
      // Get the gaussian weight of the sample. The gaussian window
      // has a standard deviation equal to NBP/2. Note that dx and dy
      // are in the normalized frame, so that -NBP/2 <= dx <= NBP/2.
      VL::float_t const wsigma = NBP/2 ;
      VL::float_t win = VL::fast_expn((nx*nx + ny*ny)/(2.0 * wsigma * wsigma)) ;
      
      // The sample will be distributed in 8 adjacent bins.
      // We start from the ``lower-left'' bin.
      int binx = fast_floor( nx - 0.5 ) ;
      int biny = fast_floor( ny - 0.5 ) ;
      int bint = fast_floor( nt ) ;
      VL::float_t rbinx = nx - (binx+0.5) ;
      VL::float_t rbiny = ny - (biny+0.5) ;
      VL::float_t rbint = nt - bint ;
      int dbinx ;
      int dbiny ;
      int dbint ;

      // Distribute the current sample into the 8 adjacent bins
      for(dbinx = 0 ; dbinx < 2 ; ++dbinx) {
        for(dbiny = 0 ; dbiny < 2 ; ++dbiny) {
          for(dbint = 0 ; dbint < 2 ; ++dbint) {
            
            if( binx+dbinx >= -(NBP/2) &&
                binx+dbinx <   (NBP/2) &&
                biny+dbiny >= -(NBP/2) &&
                biny+dbiny <   (NBP/2) ) {
              VL::float_t weight = win 
                * mod 
                * fast_abs (1 - dbinx - rbinx)
                * fast_abs (1 - dbiny - rbiny)
                * fast_abs (1 - dbint - rbint) ;
              
              atd(binx+dbinx, biny+dbiny, (bint+dbint) % NBO) += weight ;
            }
          }            
        }
      }
    }  
  }

  /* Standard SIFT descriptors are normalized, truncated and normalized again */
  if( normalizeDescriptor ) {

    /* Normalize the histogram to L2 unit length. */        
    Detail::normalize_histogram(descr_pt, descr_pt + NBO*NBP*NBP) ;
    
    /* Truncate at 0.2. */
    for(bin = 0; bin < NBO*NBP*NBP ; ++bin) {
      if (descr_pt[bin] > 0.2) descr_pt[bin] = 0.2;
    }
    
    /* Normalize again. */
    Detail::normalize_histogram(descr_pt, descr_pt + NBO*NBP*NBP) ;
  }

}

// Assembly:
subq $0x138, %rsp            # imm = 0x138
leaq 0x140(%rsp), %rax
movq %rax, 0x28(%rsp)
movq %rdi, 0x130(%rsp)
movq %rsi, 0x128(%rsp)
movss %xmm0, 0x124(%rsp)
movq 0x130(%rsp), %rdi
movq %rdi, 0x30(%rsp)
movl (%rax), %eax
movl %eax, 0x120(%rsp)
movl 0x120(%rsp), %esi
callq 0xc5ce0
movq 0x30(%rsp), %rdi
movss %xmm0, 0x11c(%rsp)
movl 0x120(%rsp), %esi
callq 0xc5d40
movq 0x30(%rsp), %rdi
movl %eax, 0x118(%rsp)
movl 0x120(%rsp), %esi
callq 0xc5df0
movl %eax, %ecx
movq 0x28(%rsp), %rax
movl %ecx, 0x114(%rsp)
movl $0x2, 0x110(%rsp)
movl 0x118(%rsp), %ecx
shll %ecx
movl %ecx, 0x10c(%rsp)
movl 0x10c(%rsp), %ecx
imull 0x114(%rsp), %ecx
movl %ecx, 0x108(%rsp)
movss 0x10(%rax), %xmm0
divss 0x11c(%rsp), %xmm0
movss %xmm0, 0x104(%rsp)
movss 0x14(%rax), %xmm0
divss 0x11c(%rsp), %xmm0
movss %xmm0, 0x100(%rsp)
movss 0x1c(%rax), %xmm0
divss 0x11c(%rsp), %xmm0
movss %xmm0, 0xfc(%rsp)
movss 0x124(%rsp), %xmm0
callq 0x5460
movss %xmm0, 0xf8(%rsp)
movss 0x124(%rsp), %xmm0
callq 0x53b0
movq 0x28(%rsp), %rcx
movq 0x30(%rsp), %rax
movss %xmm0, 0xf4(%rsp)
movss 0x104(%rsp), %xmm0
cvtss2sd %xmm0, %xmm0
movsd 0x3196(%rip), %xmm1     # 0xc8048
addsd %xmm1, %xmm0
cvttsd2si %xmm0, %edx
movl %edx, 0xf0(%rsp)
movss 0x100(%rsp), %xmm0
cvtss2sd %xmm0, %xmm0
movsd 0x3172(%rip), %xmm1     # 0xc8048
addsd %xmm1, %xmm0
cvttsd2si %xmm0, %edx
movl %edx, 0xec(%rsp)
movl 0xc(%rcx), %ecx
movl %ecx, 0xe8(%rsp)
movl $0x8, 0xe4(%rsp)
movl $0x4, 0xe0(%rsp)
movss 0x28(%rax), %xmm0
mulss 0xfc(%rsp), %xmm0
movss %xmm0, 0xdc(%rsp)
movsd 0x28594(%rip), %xmm0    # 0xed4b8
callq 0x5410
movss 0xdc(%rsp), %xmm1
cvtss2sd %xmm1, %xmm1
mulsd %xmm1, %xmm0
movsd 0x30de(%rip), %xmm1     # 0xc8020
mulsd %xmm1, %xmm0
movsd 0x2856a(%rip), %xmm1    # 0xed4b8
divsd %xmm1, %xmm0
movsd 0x30ee(%rip), %xmm1     # 0xc8048
addsd %xmm1, %xmm0
callq 0x5900
movq 0x30(%rsp), %rcx
cvttsd2si %xmm0, %eax
movl %eax, 0xd8(%rsp)
movl $0x1, 0xd4(%rsp)
movl $0x20, 0xd0(%rsp)
movl $0x8, 0xcc(%rsp)
movl 0x120(%rsp), %eax
cmpl 0x14(%rcx), %eax
jl 0xc5024
movq 0x30(%rsp), %rdx
movl 0x120(%rsp), %eax
movl 0x14(%rdx), %ecx
addl 0xc(%rdx), %ecx
cmpl %ecx, %eax
jge 0xc5024
cmpl $0x0, 0xf0(%rsp)
jl 0xc5024
movl 0xf0(%rsp), %eax
movl 0x118(%rsp), %ecx
subl $0x1, %ecx
cmpl %ecx, %eax
jg 0xc5024
cmpl $0x0, 0xec(%rsp)
jl 0xc5024
movl 0xec(%rsp), %eax
movl 0x114(%rsp), %ecx
subl $0x1, %ecx
cmpl %ecx, %eax
jg 0xc5024
movq 0x30(%rsp), %rcx
movl 0xe8(%rsp), %eax
movl 0x18(%rcx), %ecx
addl $0x1, %ecx
cmpl %ecx, %eax
jl 0xc5024
movq 0x30(%rsp), %rcx
movl 0xe8(%rsp), %eax
movl 0x1c(%rcx), %ecx
subl $0x2, %ecx
cmpl %ecx, %eax
jle 0xc5029
jmp 0xc572c
movq 0x30(%rsp), %rdi
movl 0x120(%rsp), %esi
callq 0xc4150
movq 0x128(%rsp), %rdi
movq 0x128(%rsp), %rsi
addq $0x200, %rsi            # imm = 0x200
movl $0x0, 0xc4(%rsp)
leaq 0xc4(%rsp), %rdx
callq 0xc63a0
movq 0x30(%rsp), %rdx
movq 0x30(%rdx), %rax
movl 0xf0(%rsp), %ecx
shll %ecx
movslq %ecx, %rcx
shlq $0x2, %rcx
addq %rcx, %rax
movl 0xec(%rsp), %ecx
imull 0x10c(%rsp), %ecx
movslq %ecx, %rcx
shlq $0x2, %rcx
addq %rcx, %rax
movl 0xe8(%rsp), %ecx
subl 0x18(%rdx), %ecx
subl $0x1, %ecx
imull 0x108(%rsp), %ecx
movslq %ecx, %rcx
shlq $0x2, %rcx
addq %rcx, %rax
movq %rax, 0xb8(%rsp)
movq 0x128(%rsp), %rax
addq $0x100, %rax            # imm = 0x100
addq $0x40, %rax
movq %rax, 0xb0(%rsp)
xorl %eax, %eax
subl 0xd8(%rsp), %eax
movl %eax, 0xa8(%rsp)
movl $0x1, %eax
subl 0xec(%rsp), %eax
movl %eax, 0xa4(%rsp)
leaq 0xa8(%rsp), %rdi
leaq 0xa4(%rsp), %rsi
callq 0x93c30
movl (%rax), %eax
movl %eax, 0xac(%rsp)
movl 0xac(%rsp), %eax
movl %eax, 0x24(%rsp)
movl 0xd8(%rsp), %eax
movl %eax, 0xa0(%rsp)
movl 0x114(%rsp), %eax
subl $0x2, %eax
subl 0xec(%rsp), %eax
movl %eax, 0x9c(%rsp)
leaq 0xa0(%rsp), %rdi
leaq 0x9c(%rsp), %rsi
callq 0x93c90
movq %rax, %rcx
movl 0x24(%rsp), %eax
cmpl (%rcx), %eax
jg 0xc5674
xorl %eax, %eax
subl 0xd8(%rsp), %eax
movl %eax, 0x94(%rsp)
movl $0x1, %eax
subl 0xf0(%rsp), %eax
movl %eax, 0x90(%rsp)
leaq 0x94(%rsp), %rdi
leaq 0x90(%rsp), %rsi
callq 0x93c30
movl (%rax), %eax
movl %eax, 0x98(%rsp)
movl 0x98(%rsp), %eax
movl %eax, 0x20(%rsp)
movl 0xd8(%rsp), %eax
movl %eax, 0x8c(%rsp)
movl 0x118(%rsp), %eax
subl $0x2, %eax
subl 0xf0(%rsp), %eax
movl %eax, 0x88(%rsp)
leaq 0x8c(%rsp), %rdi
leaq 0x88(%rsp), %rsi
callq 0x93c90
movq %rax, %rcx
movl 0x20(%rsp), %eax
cmpl (%rcx), %eax
jg 0xc565c
movq 0xb8(%rsp), %rax
movl 0x98(%rsp), %ecx
shll %ecx
movslq %ecx, %rcx
shlq $0x2, %rcx
addq %rcx, %rax
movl 0xac(%rsp), %ecx
imull 0x10c(%rsp), %ecx
movslq %ecx, %rcx
movss (%rax,%rcx,4), %xmm0
movss %xmm0, 0x84(%rsp)
movq 0xb8(%rsp), %rax
movl 0x98(%rsp), %ecx
shll %ecx
movslq %ecx, %rcx
shlq $0x2, %rcx
addq %rcx, %rax
movl 0xac(%rsp), %ecx
imull 0x10c(%rsp), %ecx
movslq %ecx, %rcx
movss 0x4(%rax,%rcx,4), %xmm0
movss %xmm0, 0x80(%rsp)
movss 0x80(%rsp), %xmm0
movd %xmm0, %eax
xorl $0x80000000, %eax       # imm = 0x80000000
movd %eax, %xmm0
addss 0x124(%rsp), %xmm0
callq 0xc6310
movss %xmm0, 0x7c(%rsp)
movl 0xf0(%rsp), %eax
addl 0x98(%rsp), %eax
cvtsi2ss %eax, %xmm0
subss 0x104(%rsp), %xmm0
movss %xmm0, 0x78(%rsp)
movl 0xec(%rsp), %eax
addl 0xac(%rsp), %eax
cvtsi2ss %eax, %xmm0
subss 0x100(%rsp), %xmm0
movss %xmm0, 0x74(%rsp)
movss 0xf4(%rsp), %xmm0
movss 0x78(%rsp), %xmm2
movss 0xf8(%rsp), %xmm1
mulss 0x74(%rsp), %xmm1
mulss %xmm2, %xmm0
addss %xmm1, %xmm0
divss 0xdc(%rsp), %xmm0
movss %xmm0, 0x70(%rsp)
movss 0xf8(%rsp), %xmm0
movd %xmm0, %eax
xorl $0x80000000, %eax       # imm = 0x80000000
movd %eax, %xmm0
movss 0x78(%rsp), %xmm2
movss 0xf4(%rsp), %xmm1
mulss 0x74(%rsp), %xmm1
mulss %xmm2, %xmm0
addss %xmm1, %xmm0
divss 0xdc(%rsp), %xmm0
movss %xmm0, 0x6c(%rsp)
movss 0x280fb(%rip), %xmm0    # 0xed468
mulss 0x7c(%rsp), %xmm0
cvtss2sd %xmm0, %xmm0
movsd 0x28129(%rip), %xmm1    # 0xed4a8
divsd %xmm1, %xmm0
cvtsd2ss %xmm0, %xmm0
movss %xmm0, 0x68(%rsp)
movss 0x2da7(%rip), %xmm0     # 0xc813c
movss %xmm0, 0x64(%rsp)
movss 0x70(%rsp), %xmm0
movss 0x70(%rsp), %xmm2
movss 0x6c(%rsp), %xmm1
mulss 0x6c(%rsp), %xmm1
mulss %xmm2, %xmm0
addss %xmm1, %xmm0
cvtss2sd %xmm0, %xmm0
movsd 0x28101(%rip), %xmm1    # 0xed4c8
divsd %xmm1, %xmm0
cvtsd2ss %xmm0, %xmm0
callq 0xc63d0
movss %xmm0, 0x60(%rsp)
movss 0x70(%rsp), %xmm0
cvtss2sd %xmm0, %xmm0
movsd 0x2c5c(%rip), %xmm1     # 0xc8048
subsd %xmm1, %xmm0
cvtsd2ss %xmm0, %xmm0
callq 0xc5cc0
movl %eax, 0x5c(%rsp)
movss 0x6c(%rsp), %xmm0
cvtss2sd %xmm0, %xmm0
movsd 0x2c39(%rip), %xmm1     # 0xc8048
subsd %xmm1, %xmm0
cvtsd2ss %xmm0, %xmm0
callq 0xc5cc0
movl %eax, 0x58(%rsp)
movss 0x68(%rsp), %xmm0
callq 0xc5cc0
movl %eax, 0x54(%rsp)
movss 0x70(%rsp), %xmm0
cvtss2sd %xmm0, %xmm0
cvtsi2sdl 0x5c(%rsp), %xmm1
movsd 0x2c01(%rip), %xmm2     # 0xc8048
addsd %xmm2, %xmm1
subsd %xmm1, %xmm0
cvtsd2ss %xmm0, %xmm0
movss %xmm0, 0x50(%rsp)
movss 0x6c(%rsp), %xmm0
cvtss2sd %xmm0, %xmm0
cvtsi2sdl 0x58(%rsp), %xmm1
movsd 0x2bd7(%rip), %xmm2     # 0xc8048
addsd %xmm2, %xmm1
subsd %xmm1, %xmm0
cvtsd2ss %xmm0, %xmm0
movss %xmm0, 0x4c(%rsp)
movss 0x68(%rsp), %xmm0
cvtsi2ssl 0x54(%rsp), %xmm1
subss %xmm1, %xmm0
movss %xmm0, 0x48(%rsp)
movl $0x0, 0x44(%rsp)
cmpl $0x2, 0x44(%rsp)
jge 0xc5644
movl $0x0, 0x40(%rsp)
cmpl $0x2, 0x40(%rsp)
jge 0xc5632
movl $0x0, 0x3c(%rsp)
cmpl $0x2, 0x3c(%rsp)
jge 0xc5620
movl 0x5c(%rsp), %eax
addl 0x44(%rsp), %eax
cmpl $-0x2, %eax
jl 0xc560e
movl 0x5c(%rsp), %eax
addl 0x44(%rsp), %eax
cmpl $0x2, %eax
jge 0xc560e
movl 0x58(%rsp), %eax
addl 0x40(%rsp), %eax
cmpl $-0x2, %eax
jl 0xc560e
movl 0x58(%rsp), %eax
addl 0x40(%rsp), %eax
cmpl $0x2, %eax
jge 0xc560e
movss 0x60(%rsp), %xmm0
mulss 0x84(%rsp), %xmm0
movss %xmm0, 0xc(%rsp)
movl $0x1, %eax
subl 0x44(%rsp), %eax
cvtsi2ss %eax, %xmm0
subss 0x50(%rsp), %xmm0
callq 0xc6150
movaps %xmm0, %xmm1
movss 0xc(%rsp), %xmm0
mulss %xmm1, %xmm0
movss %xmm0, 0x10(%rsp)
movl $0x1, %eax
subl 0x40(%rsp), %eax
cvtsi2ss %eax, %xmm0
subss 0x4c(%rsp), %xmm0
callq 0xc6150
movaps %xmm0, %xmm1
movss 0x10(%rsp), %xmm0
mulss %xmm1, %xmm0
movss %xmm0, 0x14(%rsp)
movl $0x1, %eax
subl 0x3c(%rsp), %eax
cvtsi2ss %eax, %xmm0
subss 0x48(%rsp), %xmm0
callq 0xc6150
movaps %xmm0, %xmm1
movss 0x14(%rsp), %xmm0
mulss %xmm1, %xmm0
movss %xmm0, 0x38(%rsp)
movss 0x38(%rsp), %xmm0
movq 0xb0(%rsp), %rax
movq %rax, 0x18(%rsp)
movl 0x54(%rsp), %eax
addl 0x3c(%rsp), %eax
movl $0x8, %ecx
cltd
idivl %ecx
movq 0x18(%rsp), %rax
shll $0x0, %edx
movslq %edx, %rcx
shlq $0x2, %rcx
addq %rcx, %rax
movl 0x58(%rsp), %ecx
addl 0x40(%rsp), %ecx
shll $0x5, %ecx
movslq %ecx, %rcx
shlq $0x2, %rcx
addq %rcx, %rax
movl 0x5c(%rsp), %ecx
addl 0x44(%rsp), %ecx
shll $0x3, %ecx
movslq %ecx, %rcx
addss (%rax,%rcx,4), %xmm0
movss %xmm0, (%rax,%rcx,4)
jmp 0xc5610
movl 0x3c(%rsp), %eax
addl $0x1, %eax
movl %eax, 0x3c(%rsp)
jmp 0xc54c7
jmp 0xc5622
movl 0x40(%rsp), %eax
addl $0x1, %eax
movl %eax, 0x40(%rsp)
jmp 0xc54b4
jmp 0xc5634
movl 0x44(%rsp), %eax
addl $0x1, %eax
movl %eax, 0x44(%rsp)
jmp 0xc54a1
jmp 0xc5646
movl 0x98(%rsp), %eax
addl $0x1, %eax
movl %eax, 0x98(%rsp)
jmp 0xc51b6
jmp 0xc565e
movl 0xac(%rsp), %eax
addl $0x1, %eax
movl %eax, 0xac(%rsp)
jmp 0xc5120
movq 0x30(%rsp), %rax
testb $0x1, 0x2c(%rax)
je 0xc572c
movq 0x128(%rsp), %rdi
movq 0x128(%rsp), %rsi
addq $0x200, %rsi            # imm = 0x200
callq 0xc4c90
movl $0x0, 0xc8(%rsp)
cmpl $0x80, 0xc8(%rsp)
jge 0xc5710
movq 0x128(%rsp), %rax
movslq 0xc8(%rsp), %rcx
movss (%rax,%rcx,4), %xmm0
cvtss2sd %xmm0, %xmm0
movsd 0x27de8(%rip), %xmm1    # 0xed4c0
ucomisd %xmm1, %xmm0
jbe 0xc56fb
movq 0x128(%rsp), %rax
movslq 0xc8(%rsp), %rcx
movss 0x27d6e(%rip), %xmm0    # 0xed464
movss %xmm0, (%rax,%rcx,4)
jmp 0xc56fd
movl 0xc8(%rsp), %eax
addl $0x1, %eax
movl %eax, 0xc8(%rsp)
jmp 0xc56aa
movq 0x128(%rsp), %rdi
movq 0x128(%rsp), %rsi
addq $0x200, %rsi            # imm = 0x200
callq 0xc4c90
addq $0x138, %rsp            # imm = 0x138
retq
nopw %cs:(%rax,%rax)
nop