Subversion Repositories openrisc_2011-10-31

/* { dg-do compile { target i?86-*-* x86_64-*-* } } */

/* { dg-require-effective-target ilp32 } */

/* { dg-require-effective-target sse2 } */

/* { dg-options "-O2 -fprefetch-loop-arrays -march=athlon -msse2 -mfpmath=sse --param simultaneous-prefetches=100 -fdump-tree-aprefetch-details" } */

#define N 1000

#define K 900

double a[N][N];

double test(void)

{

  unsigned i, j;

  double sum = 0;

  /* Here, we should use non-temporal prefetch instruction.  */

  for (i = 0; i < K; i++)

    for (j = 0; j < K; j++)

      sum += a[i][j];

  /* Here, we should not use non-temporal prefetch instruction, since the

     value of a[i+10][j] is reused in L2 cache.  */

  for (i = 0; i < K; i++)

    for (j = 0; j < K; j++)

      sum += a[i][j] * a[i + 10][j];

  /* Here, we should use non-temporal prefetch instruction, since the

     value of a[i+100][j] is too far to be reused in L2 cache.  */

  for (i = 0; i < K; i++)

    for (j = 0; j < K; j++)

      sum += a[i][j] * a[i + 100][j];

  /* Here, temporal prefetches should be used, since the volume of the

     memory accesses is smaller than L2 cache.  */

  for (i = 0; i < 100; i++)

    for (j = 0; j < 100; j++)

      sum += a[i][j] * a[i + 100][j];

  /* Temporal prefetches should be used here (even though the accesses to

     a[j][i] are independent, the same cache line is almost always hit

     every N iterations).  */

  for (i = 0; i < N; i++)

    for (j = 0; j < N; j++)

      sum += a[j][i];

  return sum;

}

/* { dg-final { scan-tree-dump-times "Issued prefetch" 5 "aprefetch" } } */

/* { dg-final { scan-tree-dump-times "Issued nontemporal prefetch" 3 "aprefetch" } } */

/* { dg-final { scan-assembler-times "prefetcht" 5 } } */

/* { dg-final { scan-assembler-times "prefetchnta" 3 } } */

/* { dg-final { cleanup-tree-dump "aprefetch" } } */