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Re: [PATCH] Minor performance improvement for AMD64 assembly routines
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Nicholas Miell wrote:
> The Intel optimization manual does say to avoid using prefixes where
> possible in order to increase decoder throughput. When tuning for
> nocona, gcc doesn't generate the prefixes.
Exactly. Which is why adding this patch to blended code is a bad idea.
The prefix decoding in P4 cores is slow.
- --
â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â
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