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From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: Christopher Li <sparse@chrisli.org>
Cc: Johannes Berg <johannes@sipsolutions.net>,
	Linux-Sparse <linux-sparse@vger.kernel.org>,
	Nicolai Stange <nicstange@gmail.com>
Subject: Re: [PATCH v2] implement constant-folding in __builtin_bswap*()
Date: Wed, 23 Nov 2016 21:48:39 +0100	[thread overview]
Message-ID: <20161123204838.GA14875@macpro.local> (raw)
In-Reply-To: <CANeU7QkABOFTdUCdabWL1YwHb3Qf4huVL115AHqZBNcqUytmhg@mail.gmail.com>

On Wed, Nov 23, 2016 at 09:25:18AM +0800, Christopher Li wrote:
> On Wed, Nov 23, 2016 at 4:16 AM, Luc Van Oostenryck
> <luc.vanoostenryck@gmail.com> wrote:
> > Work great here.
> >
> > If needed here is my
> > Tested-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
> 

There is a problem though, with non-constant args.
Now the predeclarations of the 3 __builtin_bswap16/32/64
are gone, no more prototype and thus no more typing information.

For example, if you call __builtin_bswap64() with an int argument,
there is no way for the next steps to know the arg must first
be 64 bit extended. Same for the result's type.

Luc

  parent reply	other threads:[~2016-11-23 20:48 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-17  9:55 [PATCH v2] implement constant-folding in __builtin_bswap*() Johannes Berg
2016-11-21  2:38 ` Christopher Li
2016-11-21  9:45   ` Johannes Berg
2016-11-22 11:13     ` Christopher Li
2016-11-22 11:39       ` Christopher Li
2016-11-22 13:15       ` Luc Van Oostenryck
2016-11-22 16:32         ` Christopher Li
2016-11-22 17:12           ` Luc Van Oostenryck
2016-11-23  1:23             ` Christopher Li
2016-11-22 20:16           ` Luc Van Oostenryck
2016-11-23  1:25             ` Christopher Li
2016-11-23 20:38               ` [PATCH] add test case for builtin bswap with constant args Luc Van Oostenryck
2016-11-24  0:17                 ` Christopher Li
2016-11-24  5:30                 ` Christopher Li
2016-11-24 13:00                   ` Luc Van Oostenryck
2016-11-23 20:48               ` Luc Van Oostenryck [this message]
2016-11-24  0:56                 ` [PATCH v2] implement constant-folding in __builtin_bswap*() Christopher Li
2016-11-24  0:58                   ` Christopher Li
2016-11-24  1:36                     ` Luc Van Oostenryck
2016-11-24  3:17                       ` Christopher Li
2016-11-24  1:31                   ` Luc Van Oostenryck
2016-11-24  3:23                     ` Christopher Li
2016-11-23  6:28           ` Johannes Berg
2016-11-23 14:30             ` Christopher Li

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