From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: Nicolai Stange <nicstange@gmail.com>
Cc: linux-sparse@vger.kernel.org, Christopher Li <sparse@chrisli.org>,
Josh Triplett <josh@joshtriplett.org>
Subject: Re: [PATCH v2 05/13] expression: examine constness of conditionals at evaluation only
Date: Tue, 26 Jan 2016 02:16:30 +0100 [thread overview]
Message-ID: <20160126011629.GC46188@macpro.local> (raw)
In-Reply-To: <878u3dg14i.fsf@gmail.com>
On Mon, Jan 25, 2016 at 03:55:09PM +0100, Nicolai Stange wrote:
> Currently, the propagation of expressions' constness flags through
> conditional expressions is done in two steps:
> - Several flags are speculatively set at expression parsing time
> - and possibly cleared again at evaluation time.
>
> Set aside this unfortunate split of code, the early propagation of
> constness flags is not able to recognize constant expressions such as
> 0 ? __builtin_choose_expr(0, 0, 0) : 0
> 0 ? 0 : __builtin_choose_expr(0, 0, 0)
> since the final expression to be thrown into the conditional
> expression is known only after evaluation.
>
> Move the whole calculation of conditional expressions' constness flags
> to the evaluation phase.
>
> Introduce support for tracking arithmetic constness propagation through
> conditional expressions.
Same comments about the description as for the previous patches.
Good otherwise.
Luc
next prev parent reply other threads:[~2016-01-26 1:16 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-25 14:47 [PATCH v2 00/13] improve constexpr handling Nicolai Stange
2016-01-25 14:49 ` [PATCH v2 01/13] expression: introduce additional expression constness tracking flags Nicolai Stange
2016-01-25 21:51 ` Luc Van Oostenryck
2016-01-26 15:26 ` Nicolai Stange
2016-01-26 15:37 ` Nicolai Stange
2016-01-25 14:51 ` [PATCH v2 02/13] expression: examine constness of casts at evaluation only Nicolai Stange
2016-01-25 22:02 ` Luc Van Oostenryck
2016-01-26 16:11 ` Nicolai Stange
2016-01-25 14:52 ` [PATCH v2 03/13] expression: examine constness of binops and alike " Nicolai Stange
2016-01-26 0:14 ` Luc Van Oostenryck
2016-01-26 15:50 ` Nicolai Stange
2016-01-26 17:24 ` Luc Van Oostenryck
2016-01-27 10:42 ` Nicolai Stange
2016-01-27 18:00 ` Luc Van Oostenryck
2016-01-26 0:59 ` Luc Van Oostenryck
2016-01-25 14:53 ` [PATCH v2 04/13] expression: examine constness of preops " Nicolai Stange
2016-01-26 1:10 ` Luc Van Oostenryck
2016-01-25 14:55 ` [PATCH v2 05/13] expression: examine constness of conditionals " Nicolai Stange
2016-01-26 1:16 ` Luc Van Oostenryck [this message]
2016-01-25 14:56 ` [PATCH v2 06/13] expression, evaluate: add support for recognizing address constants Nicolai Stange
2016-01-26 1:27 ` Luc Van Oostenryck
2016-01-26 3:10 ` Luc Van Oostenryck
2016-01-25 14:57 ` [PATCH v2 07/13] evaluate: check static storage duration objects' intializers' constness Nicolai Stange
2016-01-26 1:42 ` Luc Van Oostenryck
2016-01-26 16:08 ` Nicolai Stange
2016-01-26 17:56 ` Luc Van Oostenryck
2016-01-26 20:18 ` Luc Van Oostenryck
2016-02-01 3:00 ` Nicolai Stange
2016-01-25 14:59 ` [PATCH v2 08/13] expression: recognize references to labels as address constants Nicolai Stange
2016-01-26 1:45 ` Luc Van Oostenryck
2016-01-25 15:00 ` [PATCH v2 09/13] expression: examine constness of __builtin_offsetof at evaluation only Nicolai Stange
2016-01-26 1:57 ` Luc Van Oostenryck
2016-02-01 3:06 ` Nicolai Stange
2016-01-25 15:02 ` [PATCH v2 10/13] symbol: flag builtins constant_p, safe_p and warning as constexprs Nicolai Stange
2016-01-26 2:00 ` Luc Van Oostenryck
2016-01-25 15:03 ` [PATCH v2 11/13] evaluate: relax some constant expression rules for pointer expressions Nicolai Stange
2016-01-26 2:05 ` Luc Van Oostenryck
2016-01-25 15:04 ` [PATCH v2 12/13] expression, evaluate: support compound literals as address constants Nicolai Stange
2016-01-26 2:07 ` Luc Van Oostenryck
2016-01-25 15:05 ` [PATCH v2 13/13] symbol: do not inherit storage modifiers from base types at examination Nicolai Stange
2016-01-26 2:54 ` Luc Van Oostenryck
2016-01-25 21:01 ` [PATCH v2 00/13] improve constexpr handling Luc Van Oostenryck
2016-01-25 21:26 ` Nicolai Stange
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