[Bug middle-end/19721] [meta-bug] optimizations that CSE still catches

[dnovillo at gcc dot gnu dot org]

------- Additional Comments From dnovillo at gcc dot gnu dot org  2005-01-31 15:23 -------

SPEC comparisons for i686 before/after kazu's patch to completely disable CSE.
The 20050127 compiler has CSE enabled.  The 20050129 compiler has CSE disabled.

Compile times for SPECint were reduced by 9%.
Compile times for SPECfp were reduced by 7.1%.
Bootstrap times were reduced by 4.5%

Comparison between 20050127/spec-20050127.stats and 20050129/spec-20050129.stats
(base)

Compiler used in 20050127/spec-20050127.stats (Before)

Compiler:   gcc version 4.0.0 20050127 (experimental)
Base flags: -O2 -march=i686
Peak flags: -O3 -march=i686
Processor:  Intel(R) Pentium(R) 4 CPU 2.26GHz (2259.264 Mhz)
Memory:     1034472 kB
Cache:      512 KB

Compiler used in 20050129/spec-20050129.stats (After)

Compiler:   gcc version 4.0.0 20050129 (experimental)
Base flags: -O2 -march=i686
Peak flags: -O3 -march=i686
Processor:  Intel(R) Pentium(R) 4 CPU 2.26GHz (2259.264 Mhz)
Memory:     1034472 kB
Cache:      512 KB


SPECint results for base

    Benchmark   Before   After  % diff
     164.gzip   650.42  578.34  - 11.08%
      175.vpr   421.04  418.82  -  0.53%
      176.gcc   717.60  710.60  -  0.98%
      181.mcf   426.30  426.49  +  0.05%
   186.crafty   635.60  632.86  -  0.43%
   197.parser   546.62  563.78  +  3.14%
      252.eon   541.23  566.44  +  4.66%
  253.perlbmk   704.34  685.23  -  2.71%
      254.gap   741.52  708.46  -  4.46%
   255.vortex   822.37  823.91  +  0.19%
    256.bzip2   524.96  524.44  -  0.10%
    300.twolf   544.79  552.95  +  1.50%
         mean   594.14  588.36  -  0.97%


SPECfp result for base

    Benchmark   Before   After  % diff
  168.wupwise   579.39  626.80  +  8.18%
     171.swim   501.51  490.96  -  2.10%
    172.mgrid   372.63  374.65  +  0.54%
    173.applu   557.58  529.18  -  5.09%
     177.mesa   417.03  412.20  -  1.16%
   178.galgel   485.88  482.41  -  0.71%
      179.art   207.13  205.69  -  0.70%
   183.equake   820.26  797.45  -  2.78%
  187.facerec   346.83  337.74  -  2.62%
     188.ammp   343.35  333.60  -  2.84%
    189.lucas   498.16  505.99  +  1.57%
    191.fma3d   465.00  433.92  -  6.68%
 200.sixtrack   383.56  371.22  -  3.22%
     301.apsi   422.75  423.89  +  0.27%
         mean   437.11  431.45  -  1.29%


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19721