[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: call-with-values compilation!
From: |
Andy Wingo |
Subject: |
Re: call-with-values compilation! |
Date: |
Wed, 17 Sep 2008 23:52:58 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) |
On Wed 17 Sep 2008 21:42, "Neil Jerram" <address@hidden> writes:
> 2008/9/16 Andy Wingo <address@hidden>:
>> This new instruction, mv-call, takes three byte arguments, and at least
>> two stack arguments. The byte arguments are the number of args, and two
>> bytes to specify an offset to the multiple values return address. The
>
> Why _two_bytes to specify an offset? Is it just to support offsets >
> 255, or is there some other interpretation of the two bytes?
Yep, just for offsets >= 255 -- while unlikely in practice, it is likely
for the `br' family of instructions, and I reused that machinery.
In the future, as Ludovic mentions, we should probably look at
word-aligning all of our instructions; that is, once everything is
working and we can do some meaningful benchmarks. Then we could probably
have 3 bytes of "argument", potentially, for all fixed-length
instructions.
Andy
--
http://wingolog.org/