From: Joseph Myers <joseph@codesourcery.com>
To: Richard Biener <rguenther@suse.de>
Cc: Marek Polacek <polacek@redhat.com>,
GCC Patches <gcc-patches@gcc.gnu.org>,
Jakub Jelinek <jakub@redhat.com>
Subject: Re: [PATCH] Add save_expr langhook (PR c/68513)
Date: Sat, 28 Nov 2015 16:19:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.10.1511281600370.8818@digraph.polyomino.org.uk> (raw)
In-Reply-To: <43651703-7ABE-491D-8D5B-863E921EA365@suse.de>
On Sat, 28 Nov 2015, Richard Biener wrote:
> Different approach: after the FE folds (unexpectedly?), scan the result
> for SAVE_EXPRs and if found, drop the folding.
Or, if conversions are going to fold from language-independent code (which
is the underlying problem here - a conversion without folding would be
preferred once the fallout from that can be resolved), make the front end
fold with c_fully_fold before doing the conversion, and wrap the result of
the conversion in a C_MAYBE_CONST_EXPR with c_wrap_maybe_const in the same
way as done in other places that fold early (if either c_fully_fold
indicates it can't occur in a constant expression, or the result of
folding / conversion is not an INTEGER_CST).
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2015-11-28 16:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-27 19:02 Marek Polacek
2015-11-27 19:36 ` Marek Polacek
2015-11-27 23:56 ` Joseph Myers
2015-11-30 12:58 ` Marek Polacek
2015-11-28 8:38 ` Richard Biener
2015-11-28 16:19 ` Joseph Myers [this message]
2015-11-30 15:41 ` Marek Polacek
2015-11-30 15:51 ` Marek Polacek
2015-11-30 16:00 ` Richard Biener
2015-11-30 16:06 ` Richard Biener
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