subject:"\[Bug fortran\/52473\] CSHIFT slow \- inline it\?"

[Bug fortran/52473] CSHIFT slow - inline it?

2018-11-19 Thread dominiq at lps dot ens.fr

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #21 from Dominique d'Humieres --- > The original test case is still slow, so I guess we should > keep this open. Which test?

[Bug fortran/52473] CSHIFT slow - inline it?

2018-11-19 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #20 from Thomas Koenig --- The original test case is still slow, so I guess we should keep this open.

[Bug fortran/52473] CSHIFT slow - inline it?

2018-11-19 Thread marxin at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 Martin Liška changed: What|Removed |Added CC||marxin at gcc dot gnu.org --- Comment

[Bug fortran/52473] CSHIFT slow - inline it?

2018-08-06 Thread juergen.reuter at desy dot de

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #18 from Jürgen Reuter --- The example by posted on May 20, 2017 on c.l.f. improved by Stefano Zaghi below shows a factor of 10-20 improvement now in gfortran 9.0.0 including the work by Thomas Koenig. $ ./a.out Elapsed CPU time =

[Bug fortran/52473] CSHIFT slow - inline it?

2018-03-30 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #17 from Thomas Koenig --- Large-scale cshift is OK now. The original test case, or inlining something like b = cshift(a,-1) - 2*a + cshift(a,1) to efficiently calculate a second derivative on a circular array would be quite nice.

[Bug fortran/52473] CSHIFT slow - inline it?

2018-03-28 Thread dominiq at lps dot ens.fr

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #16 from Dominique d'Humieres --- For the original test compiled with -Ofast, I get Testing explicit DO loops Dim =1 Elapsed CPU time = 0.846953988 Dim =2 Elapsed CPU time = 0.724469006 Dim

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-25 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 Thomas Koenig changed: What|Removed |Added Status|ASSIGNED|NEW Assignee|tkoenig at gcc

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-24 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #14 from Thomas Koenig --- Author: tkoenig Date: Sat Jun 24 07:07:56 2017 New Revision: 249620 URL: https://gcc.gnu.org/viewcvs?rev=249620=gcc=rev Log: 2017-06-24 Thomas Koenig PR fortran/52473

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-18 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #13 from Thomas Koenig --- Author: tkoenig Date: Sun Jun 18 18:04:19 2017 New Revision: 249350 URL: https://gcc.gnu.org/viewcvs?rev=249350=gcc=rev Log: 2017-06-18 Thomas Koenig PR fortran/52473

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-12 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #12 from Thomas Koenig --- Created attachment 41542 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41542=edit Test case which still fails

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-12 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #11 from Thomas Koenig --- Created attachment 41541 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41541=edit Patch for the library, not yet quite correct This is a patch which brings a dramatic speedup for any cshift with

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-11 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #10 from Thomas Koenig --- Also see the discussion at https://groups.google.com/forum/#!topic/comp.lang.fortran/AI0F1Vpkc3I There is one thing that I do not understand. For the following test code, which compares straightforward

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-10 Thread dominiq at lps dot ens.fr

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #9 from Dominique d'Humieres --- > How often or how important is this feature? Would it improve any known > benchmark or real world application in a significant manner? Egg and chicken problem! If CSHIFT is slow, nobody will use it.

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-10 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #8 from Thomas Koenig --- (In reply to Jerry DeLisle from comment #7) > (In reply to Thomas Koenig from comment #6) > > Created attachment 41508 [details] > > What an unrolled cshift could look like > > > > This is what an unrolled

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-08 Thread jvdelisle at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 Jerry DeLisle changed: What|Removed |Added CC||jvdelisle at gcc dot gnu.org ---

[Bug fortran/52473] CSHIFT slow - inline it?

2017-06-08 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #6 from Thomas Koenig --- Created attachment 41508 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41508=edit What an unrolled cshift could look like This is what an unrolled version of cshift could look like, for a simple

[Bug fortran/52473] CSHIFT slow - inline it?

2017-05-21 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 Thomas Koenig changed: What|Removed |Added Status|NEW |ASSIGNED Assignee|unassigned

[Bug fortran/52473] CSHIFT slow - inline it?

2016-12-26 Thread tkoenig at gcc dot gnu.org

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473 --- Comment #4 from Thomas Koenig --- Looking at the code, inlining cshift for a constant shift could already be a good idea. So, change b = cshift(b,1) + cshift(b,-1) to a = b b(1) = a(2) + a(n) b(2:n-1) = a(1:n-2) + a(3:n) b(n) = a(1) +