[Bug fortran/44235] array temporary with high upper bound

["tkoenig at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from tkoenig at gcc dot gnu dot org  2010-08-07 11:17 -------
(In reply to comment #6)

Hi Dominique,

> It turns out that the test in comment #0 was not fixed by the patch in comment
> #5, but by revision 162966. However with the slight change
> 
>   a(4:23:3) = a(4:22:3)
> 
> a temporary is still created. The patch in comment #5 avoid temporaries in
> situations such as
> 
>   a(4:19:3) = a(7:22:3)
>   a(4:20:3) = a(7:22:3)
>   a(4:19:3) = a(7:23:3)
>   nl = 4
>   nu = 20
>   a(1:16:3) = a(4:nu:3)
>   a(1:16:3) = a(nl:20:3)
> 
> but not for
> 
>   a(1:16:3) = a(nl:nu:3)

the only unnecessary temporary still created with current trunk is your first
example.

I am more in favor of changing the upper bound to its actual value,
probably during resolution.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44235