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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/28367] accessing via union on a vector does not cause vec_extract to be used
Date: Mon, 24 Nov 2014 09:03:00 -0000	[thread overview]
Message-ID: <bug-28367-4-0pMfHXbMRx@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-28367-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28367

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, something along that line would be needed.  The issue is that
the partial value is not "available" (as in: it doesn't have a SSA name)
and thus there is nothing to CSE the load to.

I suppose that we should generalize this support for real-/imag-part of
complex values as well.  Not sure if it is worth using BIT_FIELD_REF
for getting at pieces of scalar registers (maybe it would pay off for
targets that can efficiently compute lowpart subregs).


  parent reply	other threads:[~2014-11-24  9:03 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-28367-4@http.gcc.gnu.org/bugzilla/>
2011-03-16 11:58 ` rguenth at gcc dot gnu.org
2014-10-10  0:25 ` glisse at gcc dot gnu.org
2014-11-24  9:03 ` rguenth at gcc dot gnu.org [this message]
2006-07-13  2:43 [Bug middle-end/28367] New: " pinskia at gcc dot gnu dot org
2006-07-13  5:37 ` [Bug middle-end/28367] " pinskia at gcc dot gnu dot org
2006-07-14  7:58 ` pinskia at gcc dot gnu dot org
2006-07-19 14:46 ` pinskia at gcc dot gnu dot org
2006-08-26  4:48 ` pinskia at gcc dot gnu dot org

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