From: Jeffrey A Law <law@cygnus.com>
To: Richard Henderson <rth@cygnus.com>
Cc: John Wehle <john@feith.com>, egcs@cygnus.com, egcs-patches@cygnus.com
Subject: Re: Possible CSE quirk involving SUBREG on the i386
Date: Wed, 01 Jul 1998 22:54:00 -0000 [thread overview]
Message-ID: <23985.899358631@hurl.cygnus.com> (raw)
In-Reply-To: <19980701033305.A23054@dot.cygnus.com>
In message < 19980701033305.A23054@dot.cygnus.com >you write:
> Ho hum. The explanation is simple here -- MODES_TIEABLE_P.
>
> I believe that we can do slightly better for this; while only
> the first four int regs can hold QImode values, all of them
> can hold HImode values.
>
> This happens to cure this exact problem, but the same problem
> will occur with unsigned char, and I don't see that we can do
> anything about it.
>
>
> r~
>
>
> * i386.h (HARD_REGNO_MODE_OK): Kill spurrious test.
> (MODES_TIEABLE_P): Tie SImode and HImode.
Patch seems reasonble. I think you should install it.
I think we're still trying to decide if we can relax MODES_TIEABLE_P's
need to be symmetric. :-) That might help the char problem in some
cases.
jeff
next prev parent reply other threads:[~1998-07-01 22:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-06-30 14:46 John Wehle
1998-06-30 14:08 ` Jeffrey A Law
1998-07-01 6:44 ` Richard Henderson
1998-07-01 22:54 ` Jeffrey A Law [this message]
-- strict thread matches above, loose matches on Subject: below --
1998-07-10 20:04 John Wehle
1998-07-02 0:53 John Wehle
1998-07-07 5:29 ` Jeffrey A Law
1998-07-01 20:15 John Wehle
1998-07-01 20:15 ` Jeffrey A Law
1998-07-01 20:15 ` Richard Henderson
1998-06-29 22:34 John Wehle
1998-06-30 4:50 ` Jeffrey A Law
1998-06-30 15:15 ` Richard Henderson
1998-07-01 0:54 ` David S. Miller
1998-07-01 0:54 ` Richard Henderson
1998-07-01 3:42 ` Jeffrey A Law
1998-07-01 0:54 ` David S. Miller
1998-07-01 0:54 ` Jeffrey A Law
1999-03-09 1:09 ` Jeffrey A Law
1999-03-31 23:46 ` Jeffrey A Law
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