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Re: birthpoints in rtl.

From: Diego Novillo <dnovillo at google dot com>
To: Steven Bosscher <stevenb dot gcc at gmail dot com>
Cc: Kenneth Zadeck <zadeck at naturalbridge dot com>, gcc <gcc at gcc dot gnu dot org>, "Bonzini, Paolo" <bonzini at gnu dot org>, "Park, Seongbae" <seongbae dot park at gmail dot com>, Ian Lance Taylor <iant at google dot com>, Richard Sandiford <rsandifo at nildram dot co dot uk>
Date: Fri, 29 Feb 2008 19:09:39 -0500
Subject: Re: birthpoints in rtl.
References: <47C5EF2A.5020401@naturalbridge.com> <47C6B132.3090903@naturalbridge.com> <47C88C6B.8030809@google.com> <571f6b510802291604t6ba0d302uc1a6bda69a7f807@mail.gmail.com>

On 2/29/08 7:04 PM, Steven Bosscher wrote:

I am not sure what would happen if GCC would start using FUD chains.
Is it like in SSA that every register is assigned only once?

But this would only affect the UD chains built by the DF code. My idea is to build the same UD chains, but make them sparse instead of the dense web we have today. None of this would be in the IL stream, only on the DF web.

Representing PHI nodes as a NOP could be an option for getting an initial implementation quickly.

Diego.

Follow-Ups:
- Re: birthpoints in rtl.
  - From: Kenneth Zadeck
- Re: birthpoints in rtl.
  - From: Paolo Bonzini

References:
- Re: birthpoints in rtl.
  - From: Steven Bosscher

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