Author: Dann Corbit
Date: 14:01:12 01/10/03
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On January 10, 2003 at 16:42:55, Frank Phillips wrote: [snip] >If you are using an Athlon, then you might wish to compare the speed of your >program using the non assembler and assembler versions of FirstBit, LastBit and >PopCount, just to check which is faster. > >As Bruce already hinted, you might also do a profile to check how significant >PopCount is to overall speed. It is very important that you benchmark it within the application, also. As a standalone test, with just a C version and assembly version, likely the assembly version will beat the pants off of the C version. However, the assembly code will often defeat or confuse the optimizer. The net effect can even be a slowdown when inserted into real code.
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