Re: -mips3 question

Izumi Tsutsui <[email protected]> Wed, 25 Sep 2002 21:16:46 +0900 (JST)

Newsgroups	gmane.os.netbsd.ports.mips
Message-ID	<[email protected]>

In article <[email protected]>
[email protected] wrote:

> 	Can we safely use -mips3 on a NetBSD mips machine, or would it
> 	need to be -mips3 -mabi=32?

See gcc(1) man page:

>       -mips2 Issue instructions from level 2  of  the  MIPS  ISA
>              (branch  likely,  square  root  instructions).  The
>              -mcpu=r4000 or -mcpu=r6000 switch must be  used  in
>              conjunction with -mips2.
>
>       -mips3 Issue instructions from level 3 of the MIPS ISA (64
>              bit instructions).  The -mcpu=r4000 switch must  be
>              used in conjunction with -mips2.

So you have to use -mips2 for R4000 in 32bit ABI.
---
Izumi Tsutsui
[email protected]