[Bug middle-end/38846] [Graphite] 35% slower using -floop* than without graphite (gas_dyn of Polyhedron)

["burnus at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #6 from burnus at gcc dot gnu dot org  2010-02-23 15:29 -------
Result with current trunk (4.5.0 2010-02-23 Rev. 156999)

In a nutshell: gas_dyn is still slower - now 35% instead of 70%.
-fgraphite-identity has normal speed (or a tiny bit faster?!?), but all other
options (-floop-interchange, -floop-strip-mine, and -floop-block) cause the
slow down. -- nf is 6% slower and the rest looks fine.

 * * *

System: AMD Athlon 64 X2 Dual Core Processor 4800+ @ 2.4 GHz
Base options: gfortran -march=opteron -ffast-math -funroll-loops
-ftree-vectorize -ftree-loop-linear -msse3 -O3

LTO uses additionally the options "-flto -fwhole-program -fno-protect-parens"
Used graphite options: "-floop-interchange -floop-strip-mine -floop-block"

          LTO                             No LTO
ac        1% faster (13.16s vs. 13.31s)   =         (13.29s vs. 13.35s)
aermod    =         (30.69s vs. 30.87s)   =         (34.32s vs. 34.58s)
air       =         (15.64s vs. 15.68s)   2% faster (15.72s vs. 15.68s)
capacita  6% SLOWER (86.92s vs. 82.14s)   2% faster (81.66s vs. 82.92s)
channel   =         (15.36s vs. 15.28s)   3% faster (15.26s vs. 15.71s)
doduc     5% faster (40.97s vs. 43.05s)   5% faster (40.28s vs. 42.51s)
fatigue   2% SLOWER ( 7.21s vs.  7.08s)   4% SLOWER ( 9.99s vs.  9.57s)
gas_dyn  35% SLOWER (15.35s vs. 11.36s)  37% SLOWER (15.36s vs. 11.19s)
induct   14% faster (29.15s vs. 33.90s)  24% faster (28.07s vs. 37.08s)
linpk     1% faster (30.34s vs. 30.68s)   2% faster (30.40s vs. 31.03s)
mdbx      2% faster (20.15s vs. 20.56s)   =         (19.40s vs. 19.48s)
nf        6% SLOWER (33.49s vs. 31.49s)   6% SLOWER (33.61s vs. 31.62s)
protein   =         (64.51s vs. 64.24s)   3% SLOWER (65.65s vs. 63.84s)
rnflow    2% faster (36.07s vs. 36.82s)   =         (35.10s vs. 34.96s)
test_fpu  =         (21.93s vs. 21.85s)   2% faster (20.76s vs. 21.28s)
tfft      2% faster ( 8.25s vs.  8.43s)   1% faster (8.22s vs.  8.33s)

Geo.Mean  1% SLOWER (23.66s vs. 23.42s)   =         (24.00s vs. 23.99s)

 * * *

gas_dyn.f90 only results:
A) w/o Graphite
real    0m11.281s  user    0m11.013s  sys     0m0.044s

B) w/ -fgraphite-identity
real    0m10.622s  user    0m10.533s  sys     0m0.080s

C) w/ -floop-interchange
real    0m15.077s  user    0m14.785s  sys     0m0.068s

D) w/ -floop-strip-mine
real    0m15.818s  user    0m15.205s  sys     0m0.052s

E) w/ -floop-block
real    0m15.349s  user    0m15.249s  sys     0m0.080s

F) w/ -floop-interchange -floop-strip-mine
real    0m15.740s  user    0m15.589s  sys     0m0.044s

G) w/ -floop-interchange -floop-strip-mine -floop-block
real    0m15.658s  user    0m15.333s  sys     0m0.040s


-- 

burnus at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[Graphite] 70% slower using |[Graphite] 35% slower using
                   |-floop* than without        |-floop* than without
                   |graphite (gas_dyn of        |graphite (gas_dyn of
                   |Polyhedron)                 |Polyhedron)


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38846