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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [testsuite/] [gcc.dg/] [tree-ssa/] [pr19210-2.c] - Blame information for rev 826

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Line No. Rev Author Line
1 298 jeremybenn
/* { dg-do compile } */
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/* { dg-options "-O2 -funsafe-loop-optimizations -Wunsafe-loop-optimizations" } */
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extern void g(void);
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void
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f (unsigned n)
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{
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  unsigned k;
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  for(k = 0;k <= n;k++) /* { dg-warning "assuming.*not infinite" } */
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    g();
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  for(k = 5;k <= n;k += 4) /* { dg-warning "assuming.*not overflow" } */
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    g();
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  /* We used to get warning for this loop.  However, since then # of iterations
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     analysis improved, and we can now prove that this loop does not verflow.
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     This is because the only case when it would overflow is if n = ~0 (since
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     ~0 is divisible by 5), and this cannot be the case, since when we got
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     here, the previous loop exited, thus there exists k > n.  */
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  for(k = 5;k <= n;k += 5)
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    g();
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  for(k = 4;k <= n;k += 5) /* { dg-warning "assuming.*not overflow" } */
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    g();
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  for(k = 15;k >= n;k--) /* { dg-warning "assuming.*not infinite" } */
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    g();
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}

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