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[Bug tree-optimization/23382] [4.1 Regression] tree-ssa-alias creates a new virtual variable for malloc each time may_alias is run (HEAP)
- From: "dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Aug 2005 04:04:58 -0000
- Subject: [Bug tree-optimization/23382] [4.1 Regression] tree-ssa-alias creates a new virtual variable for malloc each time may_alias is run (HEAP)
- References: <20050814033625.23382.pinskia@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dberlin at gcc dot gnu dot org 2005-08-14 04:04 -------
Subject: Re: [4.1 Regression] tree-ssa-alias
creates a new virtual variable for malloc each time may_alias is run (HEAP)
On Sun, 2005-08-14 at 03:48 +0000, pinskia at physics dot uc dot edu
wrote:
> ------- Additional Comments From pinskia at physics dot uc dot edu 2005-08-14 03:48 -------
> Subject: Re: [4.1 Regression] tree-ssa-alias creates a new virtual variable for malloc each time may_alias is run (HEAP)
>
>
> On Aug 13, 2005, at 11:40 PM, dberlin at dberlin dot org wrote:
>
> > Uh, so?
> We keep the virtual variable around even in the clobbered variables.
I thought the call clobbered list was recomputed at the same time, which
should alleviate this problem.
If not, *that* is buggy.
Recreating the heap variables is *not* a bug. Redoing alias information
is sometihng we may not want to do, but the fact that it requires us to
recreate heap variables is a fact of life.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23382