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Re: RFA: Fix dse / postreload not to bypass add expanders

From: amylaar at spamcop dot net
To: Paolo Bonzini <bonzini at gnu dot org>
Cc: Eric Botcazou <ebotcazou at adacore dot com>, gcc-patches at gcc dot gnu dot org
Date: Fri, 04 Nov 2011 06:38:58 -0400
Subject: Re: RFA: Fix dse / postreload not to bypass add expanders
References: <20111101045348.qp9lxw7jhkogcook-nzlynne@webmail.spamcop.net> <201111032001.00867.ebotcazou@adacore.com> <4EB3BA25.7080204@gnu.org>

Quoting Paolo Bonzini <bonzini@gnu.org>:

Unless I'm missing something, this is going all the way down to the end
of the function, bypassing the CFG, so it is neither efficient nor
correct.


new_insn hasn't been emitted yet, hence it is a single insn or a short
chain of insn to implement a no-op move (for a post-modify with zero offset)
or, more likely, a two-address add.

References:
- RFA: Fix dse / postreload not to bypass add expanders
  - From: Joern Rennecke
- Re: RFA: Fix dse / postreload not to bypass add expanders
  - From: Eric Botcazou
- Re: RFA: Fix dse / postreload not to bypass add expanders
  - From: Paolo Bonzini

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