Squashed commit of the sb-vbs branch.

Includes the SD-VBS benchmarks modified to:
- Use libextra to loop as realtime jobs
- Preallocate memory before starting their main computation
- Accept input via stdin instead of via argc

Does not include the SD-VBS matlab code.

Fixes libextra execution in LITMUS^RT.

1 files changed, 247 insertions, 0 deletions

diff --git a/SD-VBS/benchmarks/sift/src/c/siftlocalmax.c b/SD-VBS/benchmarks/sift/src/c/siftlocalmax.c
new file mode 100644
index 0000000..d75bcbd
--- /dev/null
+++ b/SD-VBS/benchmarks/sift/src/c/siftlocalmax.c
@@ -0,0 +1,247 @@
+#include "sift.h"
+
+/**
+    SIFTLOCALMAX  Find local maximizers
+   Returns the indexes of the local maximizers of
+   the 3-dimensional array F.
+
+    Say, we have a Q-dimensional array F.
+   A local maximizer is an element whose value is greater than the
+   value of all its neighbors.  The neighbors of an element i1...iQ
+   are the subscripts j1...jQ such that iq-1 <= jq <= iq (excluding
+   i1...iQ itself).  For example, if Q=1 the neighbors of an element
+   are its predecessor and successor in the linear order; if Q=2, its
+   neighbors are the elements immediately to its north, south, west,
+   est, north-west, north-est, south-west and south-est
+   (8-neighborhood).
+
+   Points on the boundary of F are ignored (and never selected as
+   local maximizers).
+
+   SEL=SIFTLOCALMAX(F,THRESH) accepts an element as a mazimizer only
+   if it is at least THRES greater than all its neighbors.
+
+   SEL=SIFTLOCALMAX(F,THRESH,P) look for neighbors only in the first
+   P dimensions of the Q-dimensional array F. This is useful to
+   process F in ``slices''.
+
+   REMARK.  Matrices (2-array) with a singleton dimension are
+   interpreted as vectors (1-array). So for example SIFTLOCALMAX([0 1
+   0]) and SIFTLOCALMAX([0 1 0]') both return 2 as an aswer. However,
+   if [0 1 0] is to be interpreted as a 1x2 matrix, then the correct
+   answer is the empty set, as all elements are on the boundary.
+   Unfortunately MATLAB does not distinguish between vectors and
+   2-matrices with a singleton dimension.  To forece the
+   interpretation of all matrices as 2-arrays, use
+   SIFTLOCALMAX(F,TRESH,2) (but note that in this case the result is
+   always empty!).
+**/
+
+#define NDIMS 3
+
+F2D* siftlocalmax(F2D* in, float thresh, int intervals, int M, int N)
+{  
+  int ndims, ptoffset=0, maxIter = 0; 
+  int offsets[NDIMS];
+  int midx[NDIMS];
+  int dims[NDIMS];
+  I2D* neighbors ;
+  int nneighbors ;
+  F2D* out;
+    
+ /**  
+    We pass dogss[o], which has >1 intervals
+    If >1 intervals, then the dimensions of in[F] will be 1 x intervals
+    If =1 interval, then the dimensions of in[F] will be the size of the dogss[o] image
+    We will check for this condition.
+ **/
+    
+    ndims = NDIMS;      /* Since we have intervals number of images of size M x N */
+        dims[0] = M;
+        dims[1] = N;
+        dims[2] = intervals-1;
+
+  /* 
+     If there are only two dimensions and if one is singleton, then
+     assume that a vector has been provided as input (and treat this
+     as a COLUMN matrix with p=1). We do this because Matlab does not
+     distinguish between vectors and 1xN or Mx1 matrices and because
+     the cases 1xN and Mx1 are trivial (the result is alway empty).
+  */
+  
+  
+ 
+  /* ------------------------------------------------------------------
+   *                                                         Do the job
+   * --------------------------------------------------------------- */  
+    int maxima_size = M*N ;
+
+    I2D* maxima_start = iMallocHandle(1, maxima_size);
+    int* maxima_iterator = maxima_start->data ;
+    int* maxima_end = maxima_start->data + maxima_size ;
+
+    int i,h,o,j; 
+    F2D* pt;  
+    
+    pt = in;
+
+    /* Compute the offsets between dimensions. */
+    offsets[0] = 1 ;
+    for(i = 1 ; i < ndims ; ++i)
+    {
+      offsets[i] = offsets[i-1]*dims[i-1] ;
+    }
+
+    /* Multi-index. */
+    for(i = 0 ; i < ndims ; ++i)
+      midx[i] = 1 ;
+
+    /* Neighbors. */
+    nneighbors = 1 ;
+    o=0 ;
+    for(i = 0 ; i < ndims ; ++i) 
+    {
+      nneighbors *= 3 ;
+      midx[i] = -1 ;
+      o -= offsets[i] ;
+    }
+    nneighbors -= 1 ;
+    neighbors = iMallocHandle(1,nneighbors);
+
+    /* Precompute offsets from offset(-1,...,-1,0,...0) to
+     * offset(+1,...,+1,0,...,0). */
+    i = 0 ;
+
+    while(1) 
+    {
+      if(o != 0)
+      {
+        asubsref(neighbors, i) = o ;
+        i++;
+      }
+      h = 0 ;
+      while( o += offsets[h], (++midx[h]) > 1 ) 
+      {
+        o -= 3*offsets[h] ;
+        midx[h] = -1 ;
+        if(++h >= ndims)
+          goto stop ;
+      }
+    }
+
+  stop: ;
+
+    /* Starts at the corner (1,1,...,1,0,0,...0) */
+    for(h = 0 ; h < ndims ; ++h) 
+    {
+      midx[h] = 1 ;
+      ptoffset += offsets[h] ;
+    }
+
+
+    /* ---------------------------------------------------------------
+     *                                                            Loop
+     * ------------------------------------------------------------ */
+
+    /*
+      If any dimension in the first P is less than 3 elements wide
+      then just return the empty matrix (if we proceed without doing
+      anything we break the carry reporting algorithm below).
+    */
+
+    for(h=0 ; h < ndims ; ++h)
+      if(dims[h] < 3) 
+                goto end ;
+   
+    while(1) 
+    {
+      /* Propagate carry along multi index midx */
+      
+      h = 0 ;
+      while(midx[h] >= dims[h] - 1) 
+      {
+        midx[h] = 1 ;
+        if(++h >= ndims) 
+          goto next_layer ;
+        ++midx[h] ;
+      }
+      
+      /*  Scan neighbors */
+      {
+        float v = asubsref(pt, ptoffset);  //*pt ;
+        int is_greater = (v>=thresh) ? 1 : 0;
+        
+                assert(ptoffset < pt->width*pt->height);
+
+        i = 0  ;
+        while(is_greater && i < nneighbors)
+        {
+            if(v > asubsref(pt, ptoffset + asubsref(neighbors,i)))
+                is_greater *= 1;
+            else
+                is_greater *= 0;
+            i = i+1;
+        }
+        
+        /* Add the local maximum */
+        if(is_greater) 
+        {
+          /* Need more space? */