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Re: [MIPS] MADD issue

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: Ian Lance Taylor <iant at google dot com>
Cc: "Fu, Chao-Ying" <fu at mips dot com>, Richard Sandiford <richard at codesourcery dot com>, GCC Development <gcc at gcc dot gnu dot org>
Date: Fri, 13 Apr 2007 19:00:37 +0200
Subject: Re: [MIPS] MADD issue
References: <3CB54817FDF733459B230DD27C690CEC03EE8E3F@Exchange.mips.com> <461F6599.3060403@lu.unisi.ch> <m3ejmoxlj2.fsf@localhost.localdomain>
Reply-to: bonzini at gnu dot org

This should be a post-reload (i.e. predicated on reload_completed)
split, I think.


Actually, with the relatively recent lower-subreg work, it is
desirable to split this sort of instruction before reload.  That is,
do an unconditional split.

Right. Combine cannot cope with the resulting 4-insn sequence and merge it back with the multiplication, but split is ran after combine and before the second lower-subreg pass.

So, making this an unconditional split should be the best of both worlds.
	
Paolo

Follow-Ups:
- Re: [MIPS] MADD issue
  - From: Richard Sandiford

References:
- [MIPS] MADD issue
  - From: Fu, Chao-Ying
- Re: [MIPS] MADD issue
  - From: Paolo Bonzini
- Re: [MIPS] MADD issue
  - From: Ian Lance Taylor

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