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Re: [4.0] Doc patch for -ftree-fre

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>, Richard Guenther <richard dot guenther at gmail dot com>
Date: Tue, 05 Apr 2005 12:40:09 +0200
Subject: Re: [4.0] Doc patch for -ftree-fre
References: <42520CCE.4050802@au.ibm.com> <84fc9c00050405025921a2eba7@mail.gmail.com>

I guess, if it has no effect in 4.0, we should remove it completely
from 4.0.

Agreed.

And if
there is no chance in enabling FRE in 4.0 we should remove FRE from 4.0?

PRE and FRE are basically implemented like

  do data flow analysis for PRE/FRE
  if (!do_fre)
    turn partially redundant expressions into fully redundant
  eliminate fully redundant expressions

So it is not a big deal to have a dead if :-)

Paolo

References:
- [4.0] Doc patch for -ftree-fre
  - From: Ben Elliston
- Re: [4.0] Doc patch for -ftree-fre
  - From: Richard Guenther

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