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Re: SSA Vs unSSA

From: Diego Novillo <dnovillo at google dot com>
To: Fran Baena <franbaena at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 27 Mar 2008 11:31:29 -0400
Subject: Re: SSA Vs unSSA
References: <7ed133d10803261107o698d026eu531e47c2d229d2b3@mail.gmail.com>

On 03/26/08 14:07, Fran Baena wrote:

Hi,

what are the advantages and inconvenients of get RTL from SSA rather
than GIMPLE (previously translated from SSA)?
It has no implication in the next optimizations, isn't it?

Depends on what SSA form you want. A rewriting form is problematic because backends are allowed to modify the IL behind the back of the optimizers and can emit instructions that are difficult/impossible to represent in SSA form (parallel).

A non-rewriting form, however, is not hard to implement. We've discussed this a few weeks ago. At some point we will build a FUD-chain representation from the currently dense UD links in the DF code.

Diego.

References:
- SSA Vs unSSA
  - From: Fran Baena

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