[MPlayer-dev-eng] [PATCH] -fno-strict-aliasing on gcc > 3

[Reimar Döffinger]

Hi,
On Tue, Jul 12, 2005 at 12:34:48AM +0200, Diego Biurrun wrote:
> Please benchmark, MPlayer is the fastest player and we should try to
> keep it that way.

Fixing design issues and (assembler) optimizing will certainly help a
lot more than wasting our time with that compiler option.
Anyways I attached my results, take them with a big grain of salt since
1) I run only one test each
2) I forgot to shut down frequency scaling first
And no, I don't know for sure why -vo xv has better values than -vo
null.
Anyway I'd say the values are well in the error margin.

Greetings,
Reimar Döffinger
-------------- next part --------------
compiled with gcc 3.4.4 (Debian)
===============
MPEG2/MP3:
===============
-vo xv -ao oss (MPEG2/MP3)
real    3m31.841s
user    0m20.541s
sys     0m2.883s

-no-strict-aliasing:
real    3m31.899s
user    0m20.665s
sys     0m3.683s

=================
-vo xv -nosound -benchmark

BENCHMARKs: VC:   3.375s VO:   6.633s A:   0.000s Sys:   1.132s =   11.140s
BENCHMARK%: VC: 30.2932% VO: 59.5462% A:  0.0000% Sys: 10.1606% = 100.0000%
real    0m11.286s
user    0m8.939s
sys     0m0.199s

-no-strict-aliasing:
BENCHMARKs: VC:   3.459s VO:   6.807s A:   0.000s Sys:   1.179s =   11.445s
BENCHMARK%: VC: 30.2245% VO: 59.4747% A:  0.0000% Sys: 10.3008% = 100.0000%
real    0m11.597s
user    0m8.532s
sys     0m0.209s

==================
-vo null -nosound -benchmark

BENCHMARKs: VC:   3.311s VO:  13.896s A:   0.000s Sys:   0.997s =   18.205s
BENCHMARK%: VC: 18.1879% VO: 76.3331% A:  0.0000% Sys:  5.4790% = 100.0000%
real    0m18.343s
user    0m16.689s
sys     0m0.162s

-no-strict-aliasing:
BENCHMARKs: VC:   3.401s VO:  13.437s A:   0.000s Sys:   0.981s =   17.819s
BENCHMARK%: VC: 19.0842% VO: 75.4103% A:  0.0000% Sys:  5.5054% = 100.0000%
real    0m17.959s
user    0m16.257s
sys     0m0.178

===================
High-Def h264:
===================
-vo xv -ao oss

real    0m26.495s
user    0m23.276s
sys     0m0.301s

-no-strict-aliasing:
real    0m27.145s
user    0m23.848s
sys     0m0.308s

==============
-vo xv -nosound -benchmark

BENCHMARKs: VC:  17.255s VO:   9.461s A:   0.000s Sys:   0.248s =   26.964s
BENCHMARK%: VC: 63.9934% VO: 35.0866% A:  0.0000% Sys:  0.9200% = 100.0000%
real    0m27.116s
user    0m23.538s
sys     0m0.267s

-no-strict-aliasing:
BENCHMARKs: VC:  16.939s VO:   9.110s A:   0.000s Sys:   0.248s =   26.297s
BENCHMARK%: VC: 64.4129% VO: 34.6435% A:  0.0000% Sys:  0.9436% = 100.0000%
real    0m26.447s
user    0m23.406s
sys     0m0.306s

==============
-vo null -nosound -benchmark

BENCHMARKs: VC:  17.115s VO:   6.751s A:   0.000s Sys:   0.179s =   24.046s
BENCHMARK%: VC: 71.1779% VO: 28.0770% A:  0.0000% Sys:  0.7452% = 100.0000%
real    0m24.187s
user    0m22.982s
sys     0m0.173s

-no-strict-aliasing:
BENCHMARKs: VC:  17.383s VO:   6.687s A:   0.000s Sys:   0.175s =   24.245s
BENCHMARK%: VC: 71.6979% VO: 27.5808% A:  0.0000% Sys:  0.7213% = 100.0000%
real    0m24.386s
user    0m23.063s
sys     0m0.181s