[Bug fortran/40472] Simplification of spread intrinsic takes a long time

["dominiq at lps dot ens dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #26 from dominiq at lps dot ens dot fr  2010-05-01 12:52 -------
> The patch in #23 actually reverts the previous changes :)

I blindly applied the patch without looking at the previous changes!)

> If I read your timing correctly, that's ~4 seconds versus >10 minutes of
> before? I'd call that fixed then.

If you revert the changes, don't forget to update
gcc/testsuite/gfortran.dg/spread_size_limit.f90.
Also I see a small slow down for the test in pr34554 (gfc is patched, gfcp
not):

[macbook] f90/bug% time gfc pr34554.f90
259.917u 0.168s 4:20.44 99.8%   0+0k 0+29io 0pf+0w
[macbook] f90/bug% a.out 
         152   135210384
[macbook] f90/bug% time gfcp pr34554.f90
249.102u 0.129s 4:09.39 99.9%   0+0k 1+22io 0pf+0w
[macbook] f90/bug% a.out
         152   135210384

Also the timing (with/without patch) for a variant of pr19925 is:

[macbook] f90/bug% time gfc pr19925_1.f90 -fmax-array-constructor=100000
3.038u 0.175s 0:03.22 99.3%     0+0k 0+16io 0pf+0w

So, is the machinery around -fmax-array-constructor still needed?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40472