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Atari coding BBS
| Re: branch optimisation questi |
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Posted by: Leonard
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Jun,28.2005-14:54
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Don't know anything about 68030 or 68060 (only 68000 for motoral family).
With modern CPU, you better have to think in "predicted or not-predicted" branch instead of "take or not taken". If a branch is predicted, it's very fast (whatever the PC jumps to another location or not). If it's miss-predicted, it's quite horrible ( about 40cycles on Intel !!).
The branch prediction unit on modern processor is very complex. Pentium can keep trace of patterns about 6 branchs ( 001011 or 110010 etc..), to avoid miss-prediction.
Did 68060 has branch prediction ?
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[All messages in this thread] [Start new thread]
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Topic
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Posted by
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Date
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branch optimisation question
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gwem
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Jun,22.2005-00:15
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Re: branch optimisation question
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rdpkr
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Jun,22.2005-02:08
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Re: branch optimisation questi
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Peter
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Jun,22.2005-09:41
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Re: branch optimisation questi
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earx
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Jun,23.2005-15:45
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Re: branch optimisation questi
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gwem
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Jun,23.2005-17:49
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Re: branch optimisation questi
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earx
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Jun,24.2005-18:36
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Re: branch optimisation questi
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Creature XL
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Jun,25.2005-16:01
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Re: branch optimisation questi
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Creature XL
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Jun,25.2005-16:11
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Re: branch optimisation questi
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Leonard
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Jun,28.2005-14:54
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Re: branch optimisation questi
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Creature XL
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Jun,28.2005-15:41
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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