Re: [AD] SF.net SVN: alleg:[11840] allegro/branches/4.9

[Thomas Fjellstrom <tfjellstrom@xxxxxxxxxx>]

On Sat March 14 2009, Milan Mimica wrote:
> Elias Pschernig wrote:
> > How much do you get when using (int)x? (Edit it in
> > include/allegro/internal/ainterh_float.h). I would expect int-conversion
> > to be slower with anything using the 387 floating point instructions,
> > but faster with MMX instructions.
>
> That's what I tested, but I didn't link statically and there are many
> liballegros laying around.
> Statically linked this time. I've got some interesting results:
>
> gcc-4.3.2 -march=pentium-m
> unmodified SVN:
> Time = 1.11218 s, FPS = 269.74
> #define _al_fast_float_to_int(f) ((int)f):
> Time = 1.06996 s, FPS = 280.384
>
> gcc-4.3.2 -march=i586
> unmodifed SVN:
> Time = 1.23826 s, FPS = 242.275
> #define _al_fast_float_to_int(f) ((int)f):
> Time = 3.23983 s, FPS = 92.5973
>
> gcc-4.3.2 (no extra flags, still have to figure what that means)
> unmodifed SVN:
> Time = 1.10411 s, FPS = 271.711
> #define _al_fast_float_to_int(f) ((int)f):
> Time = 1.05332 s, FPS = 284.813

try -march=native

>
> $ cat /proc/cpuinfo
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 13
> model name : Intel(R) Pentium(R) M processor 1.73GHz
> stepping : 8
> cpu MHz : 800.000
> cache size : 2048 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 2
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx bts est tm2
> bogomips : 1597.32
> clflush size : 64
>
>
>
> --
> Milan Mimica
> http://sparklet.sf.net
>
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--
Thomas Fjellstrom
tfjellstrom@xxxxxxxxxx