From: Richard Henderson <rth@redhat.com>
To: Ulrich Weigand <uweigand@de.ibm.com>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: s390: Avoid CAS boolean output inefficiency
Date: Tue, 07 Aug 2012 22:13:00 -0000 [thread overview]
Message-ID: <50219309.5000403@redhat.com> (raw)
In-Reply-To: <201208071702.q77H2DFl025511@d06av02.portsmouth.uk.ibm.com>
On 08/07/2012 10:02 AM, Ulrich Weigand wrote:
> The following patch changes the builtin expander to pass a MEM oldval
> as-is to the back-end expander, so that the back-end can move the
> store to before the CC operation. With that patch I'm also seeing
> all the IPMs disappear.
...
> What do you think about this solution? It has the advantage that
> we still get the same xor code if we actually do need the ipm ...
I'm ok with that patch.
r~
next prev parent reply other threads:[~2012-08-07 22:13 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-29 21:32 [CFT] s390: Convert from sync to atomic optabs Richard Henderson
2012-07-30 14:19 ` Ulrich Weigand
2012-07-30 15:12 ` Richard Henderson
2012-07-30 15:51 ` Ulrich Weigand
2012-07-30 18:53 ` Richard Henderson
2012-07-30 22:33 ` [PATCH 0/2] Convert s390 to atomic optabs, v2 Richard Henderson
2012-07-30 22:33 ` [PATCH 1/2] s390: Reorg s390_expand_insv Richard Henderson
2012-07-30 22:36 ` [PATCH 2/2] s390: Convert from sync to atomic optabs Richard Henderson
2012-08-06 18:34 ` Ulrich Weigand
2012-08-06 18:51 ` Richard Henderson
2012-08-06 19:45 ` Richard Henderson
2012-08-06 22:40 ` s390: Avoid CAS boolean output inefficiency Richard Henderson
2012-08-07 17:02 ` Ulrich Weigand
2012-08-07 22:13 ` Richard Henderson [this message]
2012-08-08 18:05 ` Ulrich Weigand
2012-08-09 16:55 ` Eric Botcazou
2012-07-31 9:11 ` [PATCH 0/2] Convert s390 to atomic optabs, v2 Richard Guenther
2012-07-31 15:27 ` Andrew MacLeod
2012-07-31 16:07 ` Richard Henderson
2012-08-01 8:41 ` Richard Guenther
2012-08-01 15:59 ` Richard Henderson
2012-08-01 17:14 ` Richard Guenther
2012-08-01 19:42 ` Richard Henderson
2012-07-31 18:36 ` Ulrich Weigand
2012-07-31 19:54 ` Richard Henderson
2012-08-01 23:23 ` Richard Henderson
2012-08-03 12:20 ` Ulrich Weigand
2012-08-03 14:21 ` Ulrich Weigand
2012-08-06 16:44 ` Ulrich Weigand
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