Re: Is gcc thread-unsafe?

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To: linux-os (Dick Johnson) <linux-os@...>

Cc: Nick Piggin <nickpiggin@...>, Linux Kernel Mailing List <linux-kernel@...>, Linus Torvalds <torvalds@...>

Date: Thursday, October 25, 2007 - 8:16 am

On Thursday 25 October 2007 13:58:56 linux-os (Dick Johnson) wrote:
quoted text> 
> On Thu, 25 Oct 2007, Andi Kleen wrote:
> 
> > On Thursday 25 October 2007 05:24, Nick Piggin wrote:
> >
> >> Basically, what the gcc developers are saying is that gcc is
> >> free to load and store to any memory location, so long as it
> >> behaves as if the instructions were executed in sequence.
> >
> > This case is clearly a bug, a very likely code pessimization.
> > I guess it wasn't intentional, just an optimization that is useful
> > for local register values doing too much.
> 
> 
> I don't think it is a BUG,

Bug as in an optimization that makes the code slower than it was
before. That is clearly a bug in a compiler.

-Andi
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Messages in current thread:

Is gcc thread-unsafe?, Nick Piggin, (Wed Oct 24, 11:24 pm)

Re: Is gcc thread-unsafe?, Phillip Susi, (Wed Oct 31, 6:10 pm)

Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 10:55 am)

Re: Is gcc thread-unsafe?, Ismail , (Thu Oct 25, 6:26 pm)

Re: Is gcc thread-unsafe?, Jeff Garzik, (Thu Oct 25, 6:56 pm)

Re: Is gcc thread-unsafe?, Jeff Garzik, (Thu Oct 25, 7:04 pm)

RE: Is gcc thread-unsafe?, David Schwartz, (Thu Oct 25, 5:42 pm)

Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 7:22 pm)

Re: Is gcc thread-unsafe?, Andrew Haley, (Fri Oct 26, 7:59 am)

Re: Is gcc thread-unsafe?, Chris Friesen, (Fri Oct 26, 1:39 pm)

Re: Is gcc thread-unsafe?, Pekka Enberg, (Thu Oct 25, 11:12 am)

Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 3:15 am)

Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 6:49 pm)

Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:09 pm)

Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 7:43 pm)

Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:55 pm)

Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 7:57 pm)

Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 7:14 pm)

Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:16 pm)

Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 7:32 pm)

Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:42 pm)

Re: Is gcc thread-unsafe?, Willy Tarreau, (Fri Oct 26, 12:57 am)

Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 7:57 pm)

Re: Is gcc thread-unsafe?, Zachary Amsden, (Thu Oct 25, 9:15 pm)

Re: Is gcc thread-unsafe?, linux-os (Dick Johnson), (Thu Oct 25, 7:58 am)

Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 8:16 am)

Re: Is gcc thread-unsafe?, Arjan van de Ven, (Wed Oct 24, 11:46 pm)

Re: Is gcc thread-unsafe?, Nick Piggin, (Wed Oct 24, 11:58 pm)

RE: Is gcc thread-unsafe?, David Schwartz, (Thu Oct 25, 12:29 am)

Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 12:47 am)

Re: Is gcc thread-unsafe?, Samuel Tardieu, (Thu Oct 25, 5:44 am)

Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 5:55 am)

Re: Is gcc thread-unsafe?, Arjan van de Ven, (Thu Oct 25, 12:35 am)


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Re: Is gcc thread-unsafe?

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