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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: jakub at redhat 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, mark at codesourcery dot com, stevenb dot gcc at gmail dot com, zadeck at naturalbridge dot com
Date: Thu, 18 Oct 2007 16:21:10 EDT
Subject: Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
References: <571f6b510710151106y62072dcbsd0ceba0579ced640@mail.gmail.com> <200710172026.41304.ebotcazou@libertysurf.fr> <4aca3dc20710171840u155249fem268b7bd4e4df8f9c@mail.gmail.com> <4716FBED.803@codesourcery.com> <10710181120.AA07766@vlsi1.ultra.nyu.edu> <471744D8.20001@naturalbridge.com> <10710181146.AA08672@vlsi1.ultra.nyu.edu> <47174B8E.4060309@naturalbridge.com> <20071018121734.GY5451@devserv.devel.redhat.com>

> AFAIK that's definitely not the case, most passes treat insns in libcall
> sequences as any other insns.  The libcall notes I believe are meant as
> optimization rather than optimization inhibitor, so I'd say what dce.c
> does with it (treats them as optimization inhibitor) is wrong.

I agree.

References:
- 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: Eric Botcazou
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Daniel Berlin
- 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: Kenneth Zadeck
- 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: Kenneth Zadeck
- Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
  - From: Jakub Jelinek

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