TRTR Performance Improvement

[JamesWekel]

Fish,

Here is a proposed performance improvement for the TRTR instruction.

Before the change, the performance test reported:

         1,000,000 iterations of TRTR  took   4,556,698 microseconds
         1,000,000 iterations of TRTR  took   4,780,255 microseconds
         1,000,000 iterations of TRTR  took   5,106,327 microseconds

and after the change:

         1,000,000 iterations of TRTR  took     213,195 microseconds
         1,000,000 iterations of TRTR  took     243,271 microseconds
         1,000,000 iterations of TRTR  took     244,445 microseconds

The performance increase is about 95%.

Please note that I've copied

#undef  MAINSTOR_PAGEBASE
#define MAINSTOR_PAGEBASE( _ma )  ((BYTE*) ((uintptr_t) ( _ma ) & PAGEFRAME_PAGEMASK)) 

from general1.c (CUSE improvement) to general2.c for crossed page tests. Hate duplication but I wasn't sure where a single copy should be placed.

Thank you for your review and updates.

Jim

[Fish-Git]

Looks pretty simple and solid to me! Pull Request approved! Well done, James!