From: Mike Frysinger <vapier@gentoo.org>
To: "Frank Ch. Eigler" <fche@redhat.com>
Cc: cgen@sourceware.org
Subject: Re: [PATCH] sim: tighten up generated decode tables
Date: Fri, 22 Dec 2023 14:55:54 -0500 [thread overview]
Message-ID: <ZYXpysSUEdzrPKRt@vapier> (raw)
In-Reply-To: <20231222161209.GC29647@redhat.com>
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On 22 Dec 2023 11:12, Frank Ch. Eigler wrote:
> > The use of /* fall through */ with consective case statements doesn't
> > really add any value, and when generating large files, can take up a
> > lot of space. In the case of cris, it alone adds ~20k, or ~10%.
>
> A few kilobytes is basically zero cost, isn't it?
you're not necessarily wrong, although i find it easier to read without so
much noise. i get that it's generated output, but when trying to debug and
understand the steps, having them be a bit readable is helpful.
i'll note that it's ~20k per file. the sim tree has ~10 of these. having
these seems like it adds up when using git as everyone has to carry the cost.
it's possible to compress the code even further if i was able to figure out
how the lisp works. we generate hundreds of case lines that could be shrunk
into 1. things like:
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
case 11:
case 12:
case 13:
case 14: itype = CRISV10F_INSN_ADDOQ; goto extract_sfmt_addoq;
could be:
case 0 ... 14: itype = CRISV10F_INSN_ADDOQ; goto extract_sfmt_addoq;
some switches have 0 ... 127.
-mike
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next prev parent reply other threads:[~2023-12-22 19:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-22 1:00 Mike Frysinger
2023-12-22 10:55 ` Jose E. Marchesi
2023-12-22 19:58 ` Mike Frysinger
2023-12-23 10:30 ` Jose E. Marchesi
2023-12-22 16:12 ` Frank Ch. Eigler
2023-12-22 19:55 ` Mike Frysinger [this message]
2023-12-22 20:05 ` Frank Ch. Eigler
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