Re: [gomp4.5] Don't mark GOMP_MAP_FIRSTPRIVATE mapped vars addressable

[Alexander Monakov]

On Wed, 11 Nov 2015, Jakub Jelinek wrote:

> Hi!
> 
> Alex reported to me privately that with the OpenMP 4.5 handling of
> array section bases (that they are firstprivate instead of mapped)
> we unnecessarily mark the pointers addressable and that result
> in less efficient way of passing them as shared to inner constructs.

Thanks!  Would you be interested in further (minimized) cases where new
implementation no longer manages to perform copy-in/copy-out optimization?
E.g. the following.  Or I can try to put such cases in Bugzilla, if you like.

Alexander

void f(int *p, int n)
{
  int tmp;
#pragma omp target map(to:p[0:n]) map(tofrom:tmp)
  {
#pragma omp parallel
    asm volatile ("" : "=r" (tmp) : "r" (p));
  }

#pragma omp target
  /* Missing optimization for 'tmp' here.  */
#pragma omp parallel
    asm volatile ("" : : "r" (tmp));
}