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From: "marc.glisse at normalesup dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/51795] linear_congruential_engine doesn't work correctly
Date: Fri, 27 Jan 2012 13:42:00 -0000	[thread overview]
Message-ID: <bug-51795-4-8xu4B7mxNe@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-51795-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51795

--- Comment #11 from Marc Glisse <marc.glisse at normalesup dot org> 2012-01-27 13:12:05 UTC ---
(In reply to comment #10)
> Really, I don't think the intent here is involving arbitrary size integers.
> This stuff must be quick, and all the integers are unsigned. I don't think we
> have here something like the templates in time, really.

But if we round first modulo 2^64 then modulo m, it isn't the linear
congruential algorithm it is supposed to be. I think I'd prefer for the
compiler to reject the code when used with values that would make the generator
too slow.

Let me ask on the reflector, to be sure.


  parent reply	other threads:[~2012-01-27 13:12 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-09  6:09 [Bug libstdc++/51795] New: " spoon.reloaded at gmail dot com
2012-01-27  7:01 ` [Bug libstdc++/51795] " 3dw4rd at verizon dot net
2012-01-27 10:59 ` paolo.carlini at oracle dot com
2012-01-27 11:23 ` paolo.carlini at oracle dot com
2012-01-27 11:46 ` paolo.carlini at oracle dot com
2012-01-27 12:18 ` paolo.carlini at oracle dot com
2012-01-27 12:47 ` paolo.carlini at oracle dot com
2012-01-27 12:53 ` paolo.carlini at oracle dot com
2012-01-27 13:02 ` paolo.carlini at oracle dot com
2012-01-27 13:06 ` marc.glisse at normalesup dot org
2012-01-27 13:07 ` paolo.carlini at oracle dot com
2012-01-27 13:42 ` marc.glisse at normalesup dot org [this message]
2012-01-27 13:48 ` paolo.carlini at oracle dot com
2012-01-27 13:49 ` paolo.carlini at oracle dot com
2012-01-27 13:55 ` marc.glisse at normalesup dot org
2012-01-27 13:58 ` paolo.carlini at oracle dot com
2012-01-27 14:08 ` paolo.carlini at oracle dot com
2012-01-27 14:12 ` marc.glisse at normalesup dot org
2012-01-27 14:28 ` paolo.carlini at oracle dot com
2012-01-27 21:45 ` spoon.reloaded at gmail dot com
2012-01-27 21:50 ` spoon.reloaded at gmail dot com
2012-01-27 21:51 ` paolo.carlini at oracle dot com
2012-01-27 21:53 ` paolo.carlini at oracle dot com
2012-01-27 21:56 ` spoon.reloaded at gmail dot com
2012-01-27 22:32 ` paolo.carlini at oracle dot com
2012-01-27 23:08 ` marc.glisse at normalesup dot org
2012-01-28  0:34 ` paolo at gcc dot gnu.org
2012-01-28 11:34 ` paolo.carlini at oracle dot com
2012-01-30 16:26 ` paolo.carlini at oracle dot com
2012-02-01 11:12 ` paolo at gcc dot gnu.org
2012-04-29 23:37 ` paolo at gcc dot gnu.org
2012-04-29 23:39 ` paolo.carlini at oracle dot com

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