Viewing file:  ivopts-3.C (1.61 KB) -rw-r--r--
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// { dg-do compile }
// { dg-options "-O2 -fdump-tree-ivopts-details" }
class MinimalVec3
{
protected:
double coords[3];
public:
MinimalVec3( ) {
for ( int i = 0; i < 3; ++i )
coords[i] = 0.;
}
inline const double& operator[] ( int I ) const {
return coords[I];
}
};
class MinimalVector
{
protected:
double *_pData;
double stuff;
public:
__attribute__((noinline)) explicit MinimalVector ( int length ) {
_pData = new double[length];
for (int i = 0; i < length; ++i) _pData[i] = 0.;
}
inline double& operator[] ( int I ) {
return _pData[I];
}
inline const double& operator[] ( int I ) const {
return _pData[I];
}
};
int main ( int , char** ) {
int w = ( 1 << 7 )+1;
int wsqr = w*w;
int wcub = w*w*w;
MinimalVec3 * rows[9];
for ( int i = 0; i < 9; ++i ) {
rows[i] = new MinimalVec3[wcub];
}
MinimalVector img ( wcub ), res ( wcub );
for ( int c = 0; c < 1000; ++c ) {
for ( int i = 1; i < w-1; ++i )
for ( int j = 0; j < 3; ++j ) {
for ( int k = 1; k < w - 1; ++k )
for ( int l = 0; l < 3; ++l ) {
for ( int m = 1; m < w - 1; ++m )
for ( int n = 0; n < 3; ++n )
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];
}
}
}
return 0;
}
// Verify that on x86_64 and i?86 we use a single IV for the innermost loop
// { dg-final { scan-tree-dump "Selected IV set for loop \[0-9\]* at \[^ \]*:64, 3 avg niters, 1 IVs" "ivopts" { target x86_64-*-* i?86-*-* } } }
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