gcc/testsuite/g++.dg/tree-ssa/ivopts-3.C

   1 // { dg-do compile }
   2 // { dg-options "-O2 -fdump-tree-ivopts-details" }
   3
   4 class MinimalVec3
   5 {
   6 protected:
   7   double coords[3];
   8
   9 public:
  10
  11   MinimalVec3( ) {
  12     for ( int i = 0; i < 3; ++i )
  13       coords[i] = 0.;
  14   }
  15
  16   inline const double& operator[] ( int I ) const {
  17     return coords[I];
  18   }
  19 };
  20
  21 class MinimalVector
  22 {
  23 protected:
  24   double *_pData;
  25   double stuff;
  26
  27 public:
  28   explicit MinimalVector ( int length ) {
  29     _pData = new double[length];
  30     for (int i = 0; i < length; ++i) _pData[i] = 0.;
  31   }
  32
  33   inline double& operator[] ( int I ) {
  34     return _pData[I];
  35   }
  36
  37   inline const double& operator[] ( int I ) const {
  38     return _pData[I];
  39   }
  40 };
  41
  42
  43 int main ( int , char** ) {
  44     int w = ( 1 << 7 )+1;
  45     int wsqr = w*w;
  46     int wcub = w*w*w;
  47
  48     MinimalVec3 * rows[9];
  49     for ( int i = 0; i < 9; ++i ) {
  50       rows[i] = new MinimalVec3[wcub];
  51     }
  52
  53     MinimalVector img ( wcub ), res ( wcub );
  54
  55     for ( int c = 0; c < 1000; ++c ) {
  56
  57       for ( int i = 1; i < w-1; ++i )
  58         for ( int j = 0; j < 3; ++j ) {
  59
  60           for ( int k = 1; k < w - 1; ++k )
  61             for ( int l = 0; l < 3; ++l ) {
  62
  63               for ( int m = 1; m < w - 1; ++m )
  64                 for ( int n = 0; n < 3; ++n )
  65                   res[i*wsqr + k*w + m] += img[( i + j - 1 ) *wsqr + ( k + l - 1 ) *w + m + n - 1] * rows[j*3 + l][i*wsqr + k*w + m][n];
  66
  67             }
  68         }
  69     }
  70     return 0;
  71 }
  72
  73 // Verify that on x86_64 and i?86 we unroll the innsermost loop and
  74 // use three IVs for the then innermost loop
  75
  76 // { dg-final { scan-tree-dump "Selected IV set for loop \[0-9\]* at \[^ \]*:63, 127 avg niters, 3 IVs" "ivopts" { target x86_64-*-* i?86-*-* } } }
  77 // { dg-final { scan-tree-dump-not "Selected IV set for loop \[0-9\]* at \[^ \]*:64" "ivopts" { target x86_64-*-* i?86-*-* } } }