[Cbe-oss-dev] [PATCH 1/3] Fix Unlikely(x) == y

[Arjan van de Ven]

On Mon, 18 Feb 2008 13:11:06 -0500
Valdis.Kletnieks at vt.edu wrote:

> On Mon, 18 Feb 2008 14:27:10 GMT, David Howells said:
> 
> > __builtin_expect() is useful on FRV where you _have_ to give each
> > branch and conditional branch instruction a measure of probability
> > whether the branch will be taken.
> 
> What does gcc do the 99.998% of the time we don't have
> likely/unlikely coded?

see Andi's email.
It gets the exact same hints that 95%+ of the kernels unlikely/likely get you,
because the heuristics in it are usually the same as the kernel programmers 
heuristics.


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