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Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)

From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
To: stevenb dot gcc at gmail dot com
Cc: Kenneth dot Zadeck at naturalbridge dot com, dberlin at dberlin dot org, ebotcazou at libertysurf dot fr, gcc-patches at gcc dot gnu dot org, jakub at redhat dot com, mark at codesourcery dot com, zadeck at naturalbridge dot com
Date: Fri, 19 Oct 2007 10:22:03 EDT
Subject: Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
References: <4716FBED.803@codesourcery.com> <471744D8.20001@naturalbridge.com> <47178759.2000509@codesourcery.com> <10710182033.AA16378@vlsi1.ultra.nyu.edu> <571f6b510710181527n61bd537ci885768afb3c539e0@mail.gmail.com> <10710190151.AA20457@vlsi1.ultra.nyu.edu> <571f6b510710182229q54401eaby1ca945a556c9bf9c@mail.gmail.com> <10710191241.AA28222@vlsi1.ultra.nyu.edu> <571f6b510710190604y980dd40k2f6522e9c78e465e@mail.gmail.com> <20071019133543.GH5451@devserv.devel.redhat.com> <571f6b510710190701m6c9d9878t4d0b49ff9efb6fa7@mail.gmail.com>

> So that would mean that you don't even need libcall notes to CSE
> _tls_get_addr calls?

You shouldn't if everything else is working right.  But, from what's been
reported here, you do, so it seems that something is broken.

As I said, it may well be that we already don't need libcall notes anymore
if some small bugs are fixed and it may well be better to fix those bugs
and kill the concept than to do further work on it.

References:
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Mark Mitchell
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Kenneth Zadeck
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Mark Mitchell
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Richard Kenner
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Steven Bosscher
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Richard Kenner
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Steven Bosscher
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Richard Kenner
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Steven Bosscher
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Jakub Jelinek
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Steven Bosscher

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