Author: Gerd Isenberg
Date: 03:09:20 07/07/03
Go up one level in this thread
On July 05, 2003 at 20:32:05, Dieter Buerssner wrote:
>Should be 80000000h
>
>I get a very strange table, when I let MSVC inline - omid is *much* faster than
>nothing! And this reproducable. And totally unexplainable by looking at the
>generated assembly. Very strange.
>
>MSVC, Russel's code, -Ox2 -Ob2 -G6 -Gr -GF
>
> nothing 3951541892 13.309
> abs() 1713113360 14.400
> simple_abs() 1713113360 17.936
> omid_abs() 1713113360 7.932 !!! Yes, reprocucable
> sbb_abs() 1713113360 17.144
> cdq_abs() 1713113360 17.555
> fish_abs() 1713113360 20.900
> sar_abs() 1713113360 16.464
> cmovl_abs() 1713113360 17.365
> cmovs_abs() 1713113360 17.345
>
i tried Russells test on P4 2.4GHz:
MSVC, corrected Russel's code, inlined
Speep optimization,
/GX /O2 /Oy-
nothing 3951541892 13.671
abs() 1713113360 13.438!
omid_abs() 1713113360 14.641
sbb_abs() 1713113360 16.640
cdq_abs() 1713113360 17.954
sar_abs() 1713113360 18.781
cmovl_abs() 1713113360 19.282
cmovs_abs() 1713113360 19.140
simple_abs() 1713113360 19.781
fish_abs() 1713113360 22.515
custom optimization:
/G6 /Gr /ML /W3 /Ox /Ot /Oa /Ow /Og /Ob2
nothing 3951541892 13.390
abs() 1713113360 13.141!
omid_abs() 1713113360 13.672
cmovs_abs() 1713113360 16.781
cmovl_abs() 1713113360 16.782
sbb_abs() 1713113360 17.969
cdq_abs() 1713113360 17.625
sar_abs() 1713113360 16.984
simple_abs() 1713113360 19.562
fish_abs() 1713113360 21.750
Gerd
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