OpenOffice.org 3.0 released
Posted Oct 14, 2008 10:40 UTC (Tue) by
efexis (guest, #26355)
In reply to:
OpenOffice.org 3.0 released by k8to
Parent article:
OpenOffice.org 3.0 released
"Pre-written code exists to use the machine values until you overflow and then trap the processor exception and special case from there on out"
Yep, that's the conditional loop bit... you loop loading/comparing each byte/word at a time, until the condition (overflow) hits and says to stop. There might be prewritten code (like the gmp library I mentioned) but it's still orders of magnitude slower than what it would be for a fixed bit width. which can be aligned to fit many into cachelines etc.
This wouldn't just need to be resolved for loading cells in, but all reference pointers (think loop variables that iterate through cells updating them) would need to be as this too.
Quite how much noticable difference this makes on a modern processor though... couldn't say without some profiling info.
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