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Re: question regarding regrename and failure of 950704-1.c on main branch


"John David Anglin" <dave@hiauly1.hia.nrc.ca> writes:

> (insn 18 17 201 (set (reg/v:DI 22 %r22 [97])
>         (plus:DI (reg:DI 25 %r25 [95])
>             (reg:DI 23 %r23 [96]))) 161 {*pa.md:3828} (insn_list 6 (insn_list 4 (nil)))
>     (expr_list:REG_DEAD (reg:SI 26 %r26)
>         (expr_list:REG_DEAD (reg:SI 24 %r24)
>             (nil))))
> 
> DI 22 overlaps DI 23.  There is no early clobber in the contraints for
> the pattern *pa.md:3828.
> 
> The failure started on or around April 30.  Is it now necessary to mark
> the output of DI mode arithmetic operations on 32-bit machines early
> clobber to prevent overlaps such as this?  Or, is this a regrename bug?

I think it's always been necessary.

-- 
- Geoffrey Keating <geoffk@geoffk.org> <geoffk@redhat.com>


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