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Date: Sun, 18 Feb 1996 16:41:52 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199602180541.QAA28125@godzilla.zeta.org.au>
To: freebsd-hackers@freebsd.org, koshy@india.hp.com
Subject: Re: Doing a rep movsw
Sender: owner-hackers@freebsd.org
Precedence: bulk

>How can one perform a "rep movsw" in Gcc?  I saw inline code to do a "rep insw"

asm("rep movsw") :-).

>in machine/cpufunc.h --- is there an equivalent inline macro for "movsw"
>that I've missed out?

No.

>I cannot use `bcopy' here because I am trying to access a memory mapped I/O
>port which requires word accesses (no 8/32 bit accesses are permitted).

There used to be a bcopyw for this.

Write it in C.  "rep movs" isn't very efficient (it shouldn't be used to
implement bcopy except possibly on 386's), and for memory mapped i/o you
will probably be waiting for the i/o.

Bruce