From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: Dibyendu Majumdar <mobile@majumdar.org.uk>
Cc: Christopher Li <sparse@chrisli.org>,
Linux-Sparse <linux-sparse@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 11/29] add PSEUDO_UNDEF
Date: Thu, 17 Aug 2017 21:01:02 +0200 [thread overview]
Message-ID: <CAExDi1SqVXhefyanyKXSQ=RV-nAjoaBzWmFd2kSYkry0TeGi4Q@mail.gmail.com> (raw)
In-Reply-To: <CACXZuxcQ0KLfmVtk4=cg-5f0Z_mw0WNj8oBrBTaGxNoyaA-5jA@mail.gmail.com>
On Thu, Aug 17, 2017 at 6:55 PM, Dibyendu Majumdar
<mobile@majumdar.org.uk> wrote:
>>> Processing in the middle-end are much easier if undefined values
>>> have been clearly identified. Once done, we can then make
>>> choices like:
>>> - always initialize them to zero
>>> - allow arbitraly simplification,
>>
>> Can pick arbitrate initialized value, but can't do arbitraly simplification.
>>
>
> I agree with that. Perhaps a specific default value can be set?
I was speaking loosely to say that a lot of simplifications are possible once
the involved pseudo(s) is/are undefined.
-- Luc
next prev parent reply other threads:[~2017-08-17 19:01 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-16 15:34 [PATCH 00/29] Simple & Efficient SSA construction Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 01/29] remove wrong part of simplify_loads() Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 02/29] give a type to OP_PHISOURCEs Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 03/29] fix test case kill-phi-ttsb Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 04/29] add test case for incomplete type Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 05/29] add test case for bad return type Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 06/29] topasm: top-level asm is special Luc Van Oostenryck
2017-08-17 6:49 ` Christopher Li
2017-08-17 19:22 ` Luc Van Oostenryck
2017-08-18 15:13 ` Christopher Li
2017-08-16 15:34 ` [PATCH 07/29] ret-void: return nothing only for void functions Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 08/29] small code reorg of add_store() Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 09/29] add helper to test if a variable is "simple" Luc Van Oostenryck
2017-08-17 7:19 ` Christopher Li
2017-08-17 16:59 ` Dibyendu Majumdar
2017-08-17 19:17 ` Luc Van Oostenryck
2017-08-17 19:21 ` Dibyendu Majumdar
2017-08-17 19:25 ` Luc Van Oostenryck
2017-08-17 19:28 ` Dibyendu Majumdar
2017-08-18 16:18 ` Christopher Li
2017-08-18 16:38 ` Luc Van Oostenryck
2017-08-18 18:15 ` Dibyendu Majumdar
2017-08-18 18:35 ` Christopher Li
2017-08-18 19:21 ` Luc Van Oostenryck
2017-08-18 20:14 ` Christopher Li
2017-08-18 20:27 ` Luc Van Oostenryck
2017-08-17 19:51 ` Luc Van Oostenryck
2017-08-17 19:14 ` Luc Van Oostenryck
2017-08-18 16:13 ` Christopher Li
2017-08-18 16:26 ` Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 10/29] add helper imple_access() to test if an access " Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 11/29] add PSEUDO_UNDEF Luc Van Oostenryck
2017-08-17 7:30 ` Christopher Li
2017-08-17 16:55 ` Dibyendu Majumdar
2017-08-17 19:01 ` Luc Van Oostenryck [this message]
2017-08-16 15:34 ` [PATCH 12/29] add undef_pseudo() Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 13/29] add insert_phi_node() Luc Van Oostenryck
2017-08-18 20:39 ` Christopher Li
2017-08-18 20:52 ` Luc Van Oostenryck
2017-08-18 21:17 ` Christopher Li
2017-08-18 21:43 ` Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 14/29] extract alloc_phisrc() from alloc_phi() Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 15/29] add remove_use() Luc Van Oostenryck
2017-08-18 20:51 ` Christopher Li
2017-08-16 15:34 ` [PATCH 16/29] ptrmap: add missing #include "compat.h" Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 17/29] ptrmap: core implementation Luc Van Oostenryck
2017-08-18 21:02 ` Christopher Li
2017-08-18 21:35 ` Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 18/29] ptrmap: add type-safe interface Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 19/29] sssa: add Simple SSA interfaces Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 20/29] sssa: add needed new members Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 21/29] sssa: add basic implementation Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 22/29] sssa: add seal_gotos() needed to seal BBs targeted by gotos Luc Van Oostenryck
2017-08-18 21:26 ` Christopher Li
2017-08-18 21:46 ` Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 23/29] sssa: set var's ident Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 24/29] sssa: add PSEUDO_INDIR Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 25/29] sssa: reorg load_var() Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 26/29] sssa: protect against unreachable loops Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 27/29] sssa: remove trivial phi-nodes Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 28/29] sssa: switch to the new SSA construction Luc Van Oostenryck
2017-08-18 21:47 ` Christopher Li
2017-08-18 21:58 ` Luc Van Oostenryck
2017-08-16 15:34 ` [PATCH 29/29] sssa: remove now unneeded simplify_one_symbol() Luc Van Oostenryck
2017-08-16 15:51 ` [PATCH 00/29] Simple & Efficient SSA construction Linus Torvalds
2017-08-16 16:12 ` Luc Van Oostenryck
2017-08-17 4:45 ` Christopher Li
2017-08-17 4:42 ` Christopher Li
2017-08-17 5:16 ` Luc Van Oostenryck
2017-08-17 5:58 ` Christopher Li
2017-08-17 19:29 ` Luc Van Oostenryck
2017-08-17 20:04 ` Luc Van Oostenryck
2017-08-19 2:08 ` Christopher Li
2017-08-17 6:09 ` Luc Van Oostenryck
2017-08-17 6:16 ` Christopher Li
2017-08-17 19:58 ` Luc Van Oostenryck
2017-08-17 10:10 ` Dibyendu Majumdar
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