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Technology Stocks : CYRIX / NSM
NSM 18.270.0%Jul 31 5:00 PM EST
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To: Scumbria who wrote (30328)11/20/1998 1:59:00 PM
From: Steve Porter  Read Replies (2) of 33344
 
Scumbria,

Power PC has cache touch instructions for preloading the cache. No one has figured out how to write a compiler to take advantage of this. The compiler has no way of accurately predicting which cache accesses will miss, and you certainly don't want unnecessary dram accesses tying up the CPU.


Scumbria, yes exactly, it CAN be done. The problem is that no one has taken the time to figure out how to do it properly.. I mean would you waste years developing a GREAT PPC compiler.. I sure as hell wouldn't.. not enough market share..

For cache touch instructions to work you need good cache querying instructions.

Steve
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