From: Thiemo Seufer <ica2_ts@csv.ica.uni-stuttgart.de>
To: binutils@sources.redhat.com
Cc: Alexandre Oliva <aoliva@redhat.com>, echristo@redhat.com
Subject: Re: MIPS assembler branch relaxations
Date: Sat, 14 Sep 2002 21:39:00 -0000 [thread overview]
Message-ID: <20020915003519.GA528@rembrandt.csv.ica.uni-stuttgart.de> (raw)
In-Reply-To: <20020914151121.GA7853@nevyn.them.org>
Daniel Jacobowitz wrote:
> On Sat, Sep 14, 2002 at 02:59:45AM -0300, Alexandre Oliva wrote:
> > This patch arranges for the MIPS assembler to turn out-of-range
> > branches into jumps. No regressions are introduced in the binutils
> > testsuites for a mips-linux build. Details on how it is done are in
> > comments in the beginning of the patch. Ok to install?
>
> A couple of thoughts:
>
> + beql reg1, reg2, 1f
> + nop
> + beqzl $0, 2f
> + nop
> + 1: j[al] label
> + delay slot (executed only if branch taken)
> + 2:
>
> Why beqzl? Admittedly, I don't know much about MIPS hardware, but I'd
> think that just "b" would probably be faster, since that's the normal
> unconditional branch.
"b" isn't a valid opcode. :-)
Btw, "beqzl" also isn't one. In this special case I'd prefer "beq".
Thiemo
next prev parent reply other threads:[~2002-09-15 0:35 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-14 4:49 Alexandre Oliva
2002-09-14 14:28 ` Daniel Jacobowitz
2002-09-14 14:46 ` Eric Christopher
2002-09-14 21:33 ` Daniel Jacobowitz
2002-09-14 21:33 ` Eric Christopher
2002-09-14 15:00 ` Paul Koning
2002-09-14 16:35 ` Daniel Jacobowitz
2002-09-14 18:43 ` Paul Koning
2002-09-14 21:39 ` Thiemo Seufer [this message]
2002-09-14 22:18 ` Alexandre Oliva
2002-09-15 2:25 ` Thiemo Seufer
2002-09-15 3:38 ` Alexandre Oliva
2002-09-15 0:49 ` Alexandre Oliva
2002-09-15 9:15 ` Daniel Jacobowitz
2002-09-16 11:56 ` Richard Henderson
2002-09-17 0:09 ` Alexandre Oliva
2002-09-17 0:26 ` Richard Henderson
2002-09-17 0:38 ` Thiemo Seufer
2002-10-09 16:51 ` Alexandre Oliva
2002-10-09 16:54 ` Alexandre Oliva
2002-10-09 17:17 ` H. J. Lu
2002-10-11 13:08 ` Eric Christopher
2002-09-14 14:39 ` H. J. Lu
2002-09-14 23:12 ` Alexandre Oliva
2002-09-15 9:13 ` H. J. Lu
2002-09-15 15:32 ` Eric Christopher
2002-09-15 16:53 ` H. J. Lu
2002-09-15 1:00 ` Alexandre Oliva
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