From: Andreas Schwab <schwab@suse.de>
To: Richard Henderson <rth@redhat.com>
Cc: Richard Sandiford <rsandifo@redhat.com>,
"Maciej W. Rozycki" <macro@linux-mips.org>,
Nigel Stephens <nigel@mips.com>,
gcc-patches@gcc.gnu.org, linux-mips@linux-mips.org
Subject: Re: [patch] MIPS/gcc: Revert removal of DImode shifts for 32-bit targets
Date: Wed, 11 Aug 2004 02:24:37 +0200 [thread overview]
Message-ID: <je3c2usere.fsf@sykes.suse.de> (raw)
In-Reply-To: <20040810232020.GA21922@redhat.com> (Richard Henderson's message of "Tue, 10 Aug 2004 16:20:20 -0700")
Richard Henderson <rth@redhat.com> writes:
> Patch seems ok then. We'd have to add a new macro/target flag
> to handle non-truncating shifts -- we've got cases:
>
> (1) Large shift shifts out all bits (ARM)
> (2) Large shifts trap (VAX)
> (3) Shift count truncated to 31, always, which means QI/HI
> shifts are yield undefined results with large shifts. (i386)
(4) Shift count reduced modulo 64 (m68k)
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2004-08-11 0:29 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-19 15:35 [patch] MIPS/gcc: Revert removal of DImode shifts for 32-bit targets Maciej W. Rozycki
2004-07-19 16:59 ` Richard Sandiford
2004-07-19 17:32 ` [patch] MIPS/gcc: Revert removal of DImode shifts for 32-bittargets David Edelsohn
2004-07-19 17:33 ` [patch] MIPS/gcc: Revert removal of DImode shifts for 32-bit targets Maciej W. Rozycki
2004-07-19 17:37 ` Richard Sandiford
2004-07-19 21:38 ` Richard Henderson
2004-07-23 14:41 ` Maciej W. Rozycki
2004-07-23 20:27 ` Richard Henderson
2004-07-23 21:12 ` Ralf Baechle
2004-07-26 11:56 ` Maciej W. Rozycki
2004-08-02 20:03 ` Nigel Stephens
2004-08-03 5:30 ` Richard Sandiford
2004-08-03 9:22 ` Nigel Stephens
2004-08-03 9:36 ` Richard Sandiford
2004-08-03 9:54 ` Nigel Stephens
2004-08-04 19:57 ` Maciej W. Rozycki
2004-08-04 20:37 ` Nigel Stephens
2004-08-04 20:54 ` Maciej W. Rozycki
2004-08-04 23:39 ` Nigel Stephens
2004-08-07 19:01 ` Richard Sandiford
2004-08-09 22:08 ` Richard Henderson
2004-08-10 5:30 ` Richard Sandiford
2004-08-10 23:20 ` Richard Henderson
2004-08-11 0:24 ` Andreas Schwab [this message]
2004-08-11 0:40 ` Paul Brook
2004-08-11 4:32 ` Richard Henderson
2004-08-31 19:51 ` Richard Sandiford
2004-09-03 6:53 ` Richard Henderson
2004-09-03 7:05 ` Richard Sandiford
2004-09-03 7:08 ` Richard Henderson
2004-09-03 7:11 ` Richard Sandiford
2004-09-03 7:20 ` Richard Henderson
2004-09-03 7:29 ` Richard Sandiford
2004-09-03 20:15 ` Richard Henderson
2004-09-04 8:53 ` Richard Sandiford
2004-09-05 0:03 ` Richard Henderson
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