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Stanislav Shwartsman bd4aa017fe Lazy flags improvement patch by Darek Mihocka - measured 5% speedup everywhere accross the board

The problem with Parity is it is generally referenced very rarely so the current lazy flags code is not efficient to updated Parify flag only (because it updates low 8 bits of .result value the existing Zero Flag has to be shadowed in .auxbits.
So I flipped it around, to make Parity be shadowed in auxbits.  .result now is only needed to derive Zero Flag, and both Sign and Parify are derived from .result + .auxbits (as Zero Flag is now).  For the 90% of the conditional jumps that are JZ or JNZ, this is a speedup.
Parity is now derived from 8 bits in .result and 8 bits in .auxbits, and Sign is derived from one flag in .result and 1 bit in .auxbits by XOR-ing them all together.  It makes the code sequences for SAHF and POPF simpler too.

2012-03-17 08:51:52 +00:00

bochs

Lazy flags improvement patch by Darek Mihocka - measured 5% speedup everywhere accross the board

2012-03-17 08:51:52 +00:00

bochs-performance

- add comments describing how blur-translate works

2002-04-17 22:51:58 +00:00

bochs-testing

- add results and conclusion

2002-11-19 15:56:26 +00:00

CVSROOT

- fixing { parameter