From: Paul Schlie <schlie@comcast.net>
To: Robert Dewar <dewar@gnat.com>
Cc: <gcc@gcc.gnu.org>
Subject: Re: INT_MIN % -1
Date: Wed, 01 Dec 2004 03:22:00 -0000 [thread overview]
Message-ID: <BDD2A300.819B%schlie@comcast.net> (raw)
In-Reply-To: <41AD12C6.4010402@gnat.com>
> From: Robert Dewar <dewar@gnat.com>
>
> Paul Schlie wrote:
>> With reference to the below:
>>
>> I would guess that rather than attempting to expose a check for a / or % by
>> -1 to the compiler, I would assume that it's best handled by the back end
>> during code generations, as the most efficient solution is target specific:
>
> Indeed, but remember we would need to have both operations, one with the
> special handling and one without.
Understood, as ADA programs may bound the domain of it's variables
guaranteeing that the operation would be well behaved within the bounds of
it's operands; but wonder if saving a few cycles out of the likely several
required for a divide or modulo operation would likely be worth the added,
albeit minor, complexity?
next prev parent reply other threads:[~2004-12-01 3:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-30 4:25 Paul Schlie
2004-11-30 7:02 ` Robert Dewar
2004-11-30 22:47 ` Paul Schlie
2004-12-01 0:39 ` Robert Dewar
2004-12-01 3:22 ` Paul Schlie [this message]
2004-12-01 11:40 ` Robert Dewar
-- strict thread matches above, loose matches on Subject: below --
2004-11-29 23:38 Morten Welinder
2004-11-30 0:24 ` David Daney
2004-11-30 0:45 ` Andreas Schwab
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