From: "Russ Cox" <rsc@swtch.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] 8a/8l bug
Date: Wed, 17 Dec 2003 18:38:22 -0500 [thread overview]
Message-ID: <E1AWlFI-000BDN-To@t40.swtch.com> (raw)
In-Reply-To: Your message of "Wed, 17 Dec 2003 18:33:12 EST." <20031217233312.GA8216@ionkov.net>
> 1. Adds a new option whether to do instruction optimizations.
> 2. Modifies y* arrays to have a flag whether the instruction code should be
> used if the optimizations are on.
I don't want a flag to fix broken behavior.
I want the linker to do the right thing.
I'd rather change the linker just to drop the
INCL/DECL as possible ADDL/SUBL encodings
and then change the compiler if the hit is actually
significant (seems like it could be).
How many other instructions are affected?
> 3. Optionally the flag also holds information whether the specific
> instruction has 0x0f/0x66 headers overriding the default specified in the
> optab array.
If you need this to handle certain instructions, then this seems
reasonable, although I'm not sure I understand why it can't
be handled with just a separate line in the y* array.
Russ
next prev parent reply other threads:[~2003-12-17 23:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-17 17:59 Latchesar Ionkov
2003-12-17 19:26 ` Latchesar Ionkov
2003-12-17 22:54 ` Russ Cox
2003-12-17 23:33 ` Latchesar Ionkov
2003-12-17 23:38 ` Russ Cox [this message]
2003-12-18 0:13 ` Latchesar Ionkov
2003-12-18 0:25 ` Charles Forsyth
2003-12-18 4:54 ` jmk
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