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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: drow at false dot org
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, stevenb dot gcc at gmail dot com, zadeck at naturalbridge dot com
Date: Fri, 19 Oct 2007 09:35:27 EDT
Subject: Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
References: <4716FBED.803@codesourcery.com> <10710181120.AA07766@vlsi1.ultra.nyu.edu> <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> <20071019132013.GA455@caradoc.them.org>

> But omitting those side effects is, from the POV of a conforming
> program, fine.  Everywhere except in the dynamic linker during TLS
> setup, at least.  Can't we get away with marking it const or pure?

Usually you do in that sort of situation.  An analogy is a memoized
function: technically it's not const or pure, but in practice you can
treat it as so.

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: 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
- 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: Daniel Jacobowitz

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