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Re: extra instructions lost from -O0 to -O1

From: Paolo Bonzini <bonzini at gnu dot org>
To: "Thomas A.M. Bernard" <t dot bernard at uva dot nl>
Cc: Steven Bosscher <stevenb dot gcc at gmail dot com>, gcc at gcc dot gnu dot org, gcc at gnu dot org
Date: Thu, 11 Sep 2008 15:38:23 +0200
Subject: Re: extra instructions lost from -O0 to -O1
Newsgroups: gmane.comp.gcc.devel
References: <48C8D907.3000207@uva.nl> <571f6b510809110323y33b8048fvb6616c11b80f7c1c@mail.gmail.com> <48C8F4F0.9080102@uva.nl>

Thomas A.M. Bernard wrote:
> I have tried unspec_volatile without success though. As
> follow,
> 
> (define_insn "setallocate"
>    [(setallocate
>            (unspec_volatile:DI [ (match_operand:DI 0 "general_operand"
> "r")]
>                                        UNSPEC_ALLOCATE)
>    )]
>  ""
>  "allocate %0\t\t#TCB_INSTRUCTIONS"    [(set_attr "type" "multi")])

This more or less should work, except that it completely subsumes the
SETALLOCATE rtx code that you've added.  The pattern should just be

 [(unspec_volatile:DI [(match_operand:DI 0 "general_operand" "r")]
                      UNSPEC_ALLOCATE)]

Paolo

Follow-Ups:
- Re: extra instructions lost from -O0 to -O1
  - From: Thomas A.M. Bernard

References:
- extra instructions lost from -O0 to -O1
  - From: Thomas A.M. Bernard
- Re: extra instructions lost from -O0 to -O1
  - From: Steven Bosscher
- Re: extra instructions lost from -O0 to -O1
  - From: Thomas A.M. Bernard

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