From: Segher Boessenkool <segher@kernel.crashing.org>
To: "Richard Earnshaw (lists)" <Richard.Earnshaw@arm.com>
Cc: gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [rtlanal] Do a better job of costing parallel sets containing flag-setting operations.
Date: Mon, 19 Jun 2017 17:41:00 -0000 [thread overview]
Message-ID: <20170619174052.GN16550@gate.crashing.org> (raw)
In-Reply-To: <1d7a949e-a24c-7636-032d-d1ab86d145a7@arm.com>
On Mon, Jun 19, 2017 at 05:01:10PM +0100, Richard Earnshaw (lists) wrote:
> Yeah, and I'm not suggesting we change the logic there (sorry if the
> description was misleading). Instead I'm proposing that we handle more
> cases for parallels to not return zero.
Right. My test run is half way through, will have results later --
your change looks good to me, but it is always surprising whether
better costs help or not, or even *hurt* good code generation (things
are just too tightly tuned to the current behaviour, so some things
may need retuning).
Segher
next prev parent reply other threads:[~2017-06-19 17:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-19 13:47 Richard Earnshaw (lists)
2017-06-19 14:08 ` Segher Boessenkool
2017-06-19 14:28 ` Richard Earnshaw (lists)
2017-06-19 15:06 ` Segher Boessenkool
2017-06-19 14:45 ` Richard Earnshaw (lists)
2017-06-19 15:09 ` Segher Boessenkool
2017-06-19 16:01 ` Richard Earnshaw (lists)
2017-06-19 17:41 ` Segher Boessenkool [this message]
2017-06-20 12:55 ` Segher Boessenkool
2017-06-30 9:03 ` Richard Earnshaw (lists)
2017-06-30 15:20 ` Jeff Law
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