port-mips: copyin() to fetch instructions for FPU.

Subject: copyin() to fetch instructions for FPU.
To: None <port-mips@netbsd.org>
From: Toru Nishimura <nisimura@itc.aist-nara.ac.jp>
List: port-mips
Date: 04/01/2000 18:30:30

I'm wondering whether it'd make any difference if all of copyin() operations
are replaced with appropriate fuiword() and brothers;

        lw      v1, _C_LABEL(curpcb)
        la      v0, _C_LABEL(fswberr)
        blt     a0, zero, _C_LABEL(fswberr)
        sw      v0, U_PCB_ONFAULT(v1)
        lw      v0, 0(a0)                       # fetch word
        j       ra
        sw      zero, U_PCB_ONFAULT(v1)

They consume only 7 instructions to execute and most of cases won't
post any exception to fetch.

Tohru Nishimura