Auto-vectorization of SUM intrinsic in gfortran

[Tim Prince]

On 1/28/2011 11:03 AM, Wilfredo Sifuentes wrote:
> Dear all,
> In spite that some information on the WWW says that the SUM intrinsic
> function of Fortran 90 can be parallelizable, I found that gfortran
> 4.5 do not parallelize the following line (even if I fix or change
> “AHID” variable to “1” ):
>
>    temporal= SUM(PERLIN(1:NLIN,AHID,1:NETP,1:NBLO))
>
> Where PERLIN is defined as:  REAL*8  PERLIN(MAXLIN,0:1,MAXETP,MAXBLO).
> The compiler report: “note: not vectorized: unsupported use in stmt.”
> Am I missing something?
>
> Regards
> Wilfredo
I don't remember the diagnostic, but SUM vectorization would never occur 
without options implying -fassociative-math (unfortunately, specifying 
that one by itself doesn't help; -ffast-math does, but is too big a hammer).
Even beyond that, more information from you may be useful.

-- 
Tim Prince