[Bug target/90811] New: [nvptx] ptxas error on OpenMP offloaded code

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90811

            Bug ID: 90811
           Summary: [nvptx] ptxas error on OpenMP offloaded code
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

The following testcase doesn't assemble when using CUDA ptxas (or fails at
runtime due to the PTX assembly not being valid) with -O2 -fopenmp:

int
main ()
{
  long long a[100], b[100];
  int i;
  for (i = 0; i < 100; i++)
    {
      a[i] = i;
      b[i] = i % 10;
    }
  #pragma omp target teams distribute parallel for simd map(tofrom: a[:100],
b[:100])
  for (i = 0; i < 100; i++)
    {
      long long c = 0;
      const long long d[] = { 1, 3, 5, 7, 9 };
      for (int j = 4; j >= 0; j--)
         c = d[j] + b[i] * c;
      a[i] += c;
    }
  for (i = 0; i < 100; i++)
    {
      const long long r[] = { 1, 26, 229, 976, 2849, 6646, 13381, 24284, 40801,
64594 };
      if (a[i] != r[i % 10] + (i / 10 * 10))
        __builtin_abort ();
    }
  return 0;
}