[Ffmpeg-devel] yet another silly int vs. float benchmark
Mike Melanson
mike
Sat May 21 19:26:20 CEST 2005
Michael Niedermayer wrote:
> Hi
>
> heres another benchmark proggy, advantages over the others
> 1. pure c
> 2. ~40 lines of code, can be easily done in less i know ...
> 3. tries to test both the case where each instruction depends upon the
> previous one and where the instructions are a little more independant
VIA x86 CPU 533 MHz:
100 ; needed 27 cycles -> 27 cycles per operation
100 iv[0]+=iv[1];iv[1]+=iv[0]; needed 231 cycles -> 115 cycles per
operation
100 iv[0]*=iv[1];iv[1]*=iv[0]; needed 1834 cycles -> 917 cycles per
operation
100 fv[0]+=fv[1];fv[1]+=fv[0]; needed 1194 cycles -> 597 cycles per
operation
100 fv[0]*=fv[1];fv[1]*=fv[0]; needed 1578 cycles -> 789 cycles per
operation
100 iv[0]+=iv[1];iv[1]+=iv[2];iv[2]+=iv[3];iv[3]+=iv[4];iv[4]+=iv[5];
needed 540 cycles -> 108 cycles per operation
100 iv[0]*=iv[1];iv[1]*=iv[2];iv[2]*=iv[3];iv[3]*=iv[4];iv[4]*=iv[5];
needed 3545 cycles -> 709 cycles per operation
100 fv[0]+=fv[1];fv[1]+=fv[2];fv[2]+=fv[3];fv[3]+=fv[4];fv[4]+=fv[5];
needed 2046 cycles -> 409 cycles per operation
100 fv[0]*=fv[1];fv[1]*=fv[2];fv[2]*=fv[3];fv[3]*=fv[4];fv[4]*=fv[5];
needed 3046 cycles -> 609 cycles per operation
--
-Mike Melanson
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