New features in Version 25.9 of prime95.exe
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1) Performance increases for the 64-bit version by taking advantage of the
eight extra SSE2 registers. The 32-bit version may also be a bit faster
by taking advantage of the Core 2 architecture. The FFT code was
originally optimized for the Pentium 4 where instructions like
"movapd reg,reg" take 6 clocks and should be avoided, whereas on Core 2
the same instruction uses just 1 clock cycle and improves scheduling.
The 32-bit version may be slightly faster or slower on the Pentium 4, but
not enough to worry about. Preliminary benchmarks indicate:
32-bit Pentium 4: between 2% slower and 1% faster
32-bit Core 2: between 2% and 6% faster
64-bit Pentium 4: between 2% and 4% faster
64-bit Core 2: between 10% and 13% faster
64-bit Core i7: between 7% and 12% faster
64-bit Phenom: between 10% and 13% faster
AMD64: between 1% slower and 1% faster
2) Intermediate save files were overhauled. Trial factoring, P-1, and
ECM now support multiple save files. The backup save file uses a .bu
extension. While a new save file is being written a .write extension
is used and renamed when successfully written (thus, briefly there are
3 save files). NOTE #1: LL save files no longer use an initial letter
of q and r. The program will automatically use these obsolete files if
necessary and delete them when no longer needed. NOTE #2: ECM and P-1
save files on k*2^n+1 no longer use file names beginning with d and l.
The -An command line argument no longer appends an extension to save
file names. NOTE #3: The client now supports keeping three save files.
3) Miscellaneous minor bug fixes.
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