From: Jeff Law <law@redhat.com>
To: Richard Henderson <rth@redhat.com>
Cc: Richard Guenther <richard.guenther@gmail.com>,
gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: RFA: Avoiding unprofitable speculation
Date: Fri, 19 Aug 2011 16:49:00 -0000 [thread overview]
Message-ID: <4E4E8355.7090206@redhat.com> (raw)
In-Reply-To: <4E4D8B54.1050409@redhat.com>
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On 08/18/11 15:59, Richard Henderson wrote:
> On 08/17/2011 12:21 AM, Richard Guenther wrote:
>> The patch itself looks sensible, though I am surprised ifcvt
>> doesn't run in cfglayout mode (so you have to use reg notes to find
>> probabilities ...)
>
> It does run in cfglayout mode.
>
> Jeff, I believe you're supposed to get the probabilities from some
> combination of
>
> bb->frequency edge->probability EDGE_FREQUENCY(edge)
I was just utilizing code that was already sprinkled all over ifcvt.c to
get the probabilities.
Changing it to edge->probability should be trivial.
Jeff
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next prev parent reply other threads:[~2011-08-19 15:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-16 22:00 Jeff Law
2011-08-17 9:34 ` Richard Guenther
2011-08-17 22:50 ` Jeff Law
2011-08-18 22:59 ` Richard Henderson
2011-08-19 16:49 ` Jeff Law [this message]
2011-09-27 0:11 ` Jeff Law
2011-09-27 13:51 ` Richard Guenther
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