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Re: [patch] Remove strange case cost code

From: Paolo Bonzini <bonzini at gnu dot org>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: Jan Hubicka <hubicka at ucw dot cz>, Steven Bosscher <stevenb dot gcc at gmail dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Tue, 17 Apr 2012 11:19:44 +0200
Subject: Re: [patch] Remove strange case cost code
References: <CABu31nPmr0aT25yg+zN_c8syDC5Cm0UxJfH+4DJuHJ4fg16ATw@mail.gmail.com> <20120417064921.GA5160@atrey.karlin.mff.cuni.cz> <CAFiYyc1AQNN3n256X0itnoXM3QtL1A6LTpyxoQrPdgjSu2+d3g@mail.gmail.com>

Il 17/04/2012 10:45, Richard Guenther ha scritto:
> > Also it is possble to get an historgrams from profile feedback into
> > switch expansion. I always wanted to do that once switch expansion code
> > is cleaned up and moved to gimple level...
> 
> Indeed.  At least the parts that expand switch stmts to (balanced) trees
> should be moved to the GIMPLE level, retaining only the table-jump-like
> expansions as switch stmts.

This would also make it much easier to drop the range checking from
switch statements (VRP would just fold those away).  Also, targets could
choose between casesi and tablejump.  ARM can benefit from that.

Paolo

References:
- [patch] Remove strange case cost code
  - From: Steven Bosscher
- Re: [patch] Remove strange case cost code
  - From: Jan Hubicka
- Re: [patch] Remove strange case cost code
  - From: Richard Guenther

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