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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: mark at codesourcery 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, stevenb dot gcc at gmail dot com, zadeck at naturalbridge dot com
Date: Thu, 18 Oct 2007 16:33:39 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> <47178759.2000509@codesourcery.com>

> We'd certainly need something to say that a function call instruction is
> deletable if its value is unused; in general, of course, we assume
> function calls have important side-effects.

I thought we have a flag for that now, but I'm not sure I remember which one.

I agree that it may well be the case that libcalls are ALREADY unnecessary,
but I'm not quite ready to assert that myself.

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

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: Mark Mitchell

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