From: Joern Rennecke <joernr@arc.com>
To: Dave Brolley <brolley@redhat.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>, cgen@sources.redhat.com
Subject: Re: delayed branches and zero overhead loops
Date: Wed, 14 Feb 2007 18:30:00 -0000 [thread overview]
Message-ID: <20070214182926.GA18550@elsdt-razorfish.arc.com> (raw)
In-Reply-To: <45D34205.9000209@redhat.com>
On Wed, Feb 14, 2007 at 12:08:21PM -0500, Dave Brolley wrote:
> Joern Rennecke wrote:
>
> >On Tue, Feb 13, 2007 at 04:11:52PM -0500, Frank Ch. Eigler wrote:
> >
> >
> >>The decoder generator is fully automatic. If you represent decodable
> >>bits without cheating, it will do a reasonable job.
> >>
> >>
> >
> >I which that were the case. Try to generate the decoder for the attached
> >file; it warns about one alledged Decoder ambiguity for j_L_r_r
> >[$RC-noilink]
> >versus j_L_r_r [$RC-ilink] . The values for $RC-ilink and $RC-noilink are
> >disjoint. I've also tried to use a decode-split on this problem, but to
> >no avail.
> >
> >
> The problem is that RC-ilink and RC-noilink are operands. They do not
> participate in insn decoding. If there are no other differences in the
> fixed fields of the insns (it's hard to tell because of the complexity
> of your pmacros),
That is indeed the case. The only format differences are in the
RC-ilink / RC-noilink operand and in the F0 / F1F operand.
> then there will be an ambiguity.
It's the same situation with long immediates. They are indicated by a
special value in any one of three operand fields.
> If you add enough
> "-v"s to CGENFLAGS when you run your make, you will get a dump of the
> pmacro-expanded input.
The debug output without any -v is already too much to be read, unless
it is captured with script and then searched for specific items.
If I want to know the expansion of a single macro, I find it more useful
to use pmacro-expand interactively - the latency is also much lower than
to rm -rf the entire build tree and then rebuilding.
Speaking of which, is there a better way? I've tried deleting individual
generated files or stamps, and some clean targets, but make always
floundered.
next prev parent reply other threads:[~2007-02-14 18:30 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-13 15:37 Joern Rennecke
2007-02-13 18:51 ` Frank Ch. Eigler
2007-02-13 21:00 ` Joern Rennecke
2007-02-13 21:12 ` Frank Ch. Eigler
2007-02-13 22:21 ` Joern Rennecke
2007-02-14 17:09 ` Dave Brolley
2007-02-14 18:30 ` Joern Rennecke [this message]
2007-02-14 19:52 ` Dave Brolley
2007-02-14 20:15 ` Joern Rennecke
2007-02-16 20:54 ` Dave Brolley
2007-02-19 3:39 ` Joern Rennecke
[not found] ` <45D9C06A.4030903@redhat.com>
2007-02-19 15:56 ` Joern Rennecke
2007-02-19 16:07 ` Frank Ch. Eigler
2007-02-19 18:14 ` Joern Rennecke
2007-02-19 18:19 ` Dave Brolley
2007-02-22 15:50 ` Joern Rennecke
2007-02-22 16:08 ` insert evaluation for multi-ifields broken Joern Rennecke
2007-02-22 16:56 ` Dave Brolley
2007-02-22 18:14 ` Joern Rennecke
2007-02-23 17:45 ` Dave Brolley
2007-02-15 16:54 ` delayed branches and zero overhead loops Joern Rennecke
2007-02-14 18:58 ` decode-bitsize (Was: Re: delayed branches and zero overhead loops) Joern Rennecke
2007-02-13 19:25 ` delayed branches and zero overhead loops Doug Evans
2007-02-13 20:38 ` Joern Rennecke
2007-02-14 18:30 ` Doug Evans
2007-02-14 19:22 ` Joern Rennecke
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