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Re: Patch proposal: use __builtin_expect
- To: green at cygnus dot com
- Subject: Re: Patch proposal: use __builtin_expect
- From: Andrew Haley <aph at pasanda dot cygnus dot co dot uk>
- Date: 22 Apr 2000 18:00:30 -0000
- CC: java-patches at sourceware dot cygnus dot com
> Date: Sat, 22 Apr 2000 10:57:18 -0700
> From: Anthony Green <green@cygnus.com>
>
> Andrew wrote:
> > Hmm. So __builtin_expect means that we expect the result *not* to be
> > true; it actually means "expect false".
>
> Not quite. You always provide the expected result. I always gave `0',
> so it does mean expect false in those cases.
>
> __builtin_expect (x, 5)
>
> ...means we expect x to be 5. It seems safest/easiest to just expect 0.
Ah, so it's easy to replace those examples with
__builtin_expect (x, false)
To say we expect the result to be false. Better, no?
Andrew.
(easily confused, evidently)