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From: Richard Sandiford <rdsandiford@googlemail.com>
To: "Maciej W. Rozycki" <macro@codesourcery.com>
Mail-Followup-To: "Maciej W. Rozycki" <macro@codesourcery.com>,<gcc-patches@gcc.gnu.org>, rdsandiford@googlemail.com
Cc: <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] MIPS16: Remove DWARF-2 location information from GP accesses
References: <alpine.DEB.1.10.1205081014470.18334@tp.orcam.me.uk>	<87havqpns2.fsf@talisman.home>	<alpine.DEB.1.10.1205091020060.11227@tp.orcam.me.uk>
Date: Wed, 09 May 2012 09:48:00 -0000
In-Reply-To: <alpine.DEB.1.10.1205091020060.11227@tp.orcam.me.uk> (Maciej	W. Rozycki's message of "Wed, 9 May 2012 10:44:04 +0100")
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"Maciej W. Rozycki" <macro@codesourcery.com> writes:
> On Tue, 8 May 2012, Richard Sandiford wrote:
>> > gcc-mips16-gp-pseudo-loc.patch
>> > Index: gcc-fsf-trunk-quilt/gcc/config/mips/mips.c
>> > ===================================================================
>> > --- gcc-fsf-trunk-quilt.orig/gcc/config/mips/mips.c	2012-05-02 23:42:46.185566469 +0100
>> > +++ gcc-fsf-trunk-quilt/gcc/config/mips/mips.c	2012-05-03 18:55:28.775580939 +0100
>> > @@ -2622,7 +2622,8 @@ mips16_gp_pseudo_reg (void)
>> >  	scan = NEXT_INSN (scan);
>> >  
>> >        insn = gen_load_const_gp (cfun->machine->mips16_gp_pseudo_rtx);
>> > -      emit_insn_after (insn, scan);
>> > +      insn = emit_insn_after (insn, scan);
>> > +      INSN_LOCATOR (insn) = 0;
>> >  
>> >        pop_topmost_sequence ();
>> >      }
>> 
>> An alternative would be to use prologue_locator, like ARM does.
>
>  Is this instruction guaranteed to be emitted once per function only?  

Yes.