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Re: Make cgraph frequencies more precise
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Jan Hubicka <hubicka at ucw dot cz>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>, David Edelsohn <dje dot gcc at gmail dot com>
- Date: Mon, 12 Oct 2015 08:08:28 -0700
- Subject: Re: Make cgraph frequencies more precise
- Authentication-results: sourceware.org; auth=none
- References: <20151012060727 dot GB53108 at kam dot mff dot cuni dot cz>
On Sun, Oct 11, 2015 at 11:07 PM, Jan Hubicka <hubicka@ucw.cz> wrote:
> Hi,
> this patch fixes a case of extreme imprecision I noticed while looking into
> profiles of PHP interpretter. There is a function that is called 22 times
> and contains the main loop. Now since the frequency of entry block is dropped
> to 0, we do not have any information of relative frequencies in the colder
> areas of the function.
>
> Hope all this uglyness with go away with conversion to sreals soonish.
>
> Profiledbootstrapped/regtested ppc64le-linux, comitted.
> * cgraphbuild.c (compute_call_stmt_bb_frequency): Use
> counts when these are more informative.
This caused:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67931
--
H.J.