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Re: GCC optimizes integer overflow: bug or feature?
From: |
Paul Eggert |
Subject: |
Re: GCC optimizes integer overflow: bug or feature? |
Date: |
Thu, 21 Dec 2006 13:52:37 -0800 |
User-agent: |
Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux) |
"Joseph S. Myers" <address@hidden> writes:
> Conversion of out-of-range integers to signed types is
> implementation-defined not undefined,
Thanks for the correction; I keep forgetting that. However,
a conforming implementation is allowed to raise a signal for
those conversions, which could break the code in question,
i.e., it could cause the test to report the wrong result.
So the distinction between undefined and
implementation-defined behavior doesn't much matter here.
(Presumably the code could work around the problem by
trapping the signal, but that is another can of porting
worms.)
I daresay many conversions of out-of-range values to signed
integers are in a similar boat.
- Re: GCC optimizes integer overflow: bug or feature?, (continued)
- Re: GCC optimizes integer overflow: bug or feature?, Andrew Pinski, 2006/12/22
- Re: GCC optimizes integer overflow: bug or feature?, Robert Dewar, 2006/12/22
- Re: GCC optimizes integer overflow: bug or feature?, Rask Ingemann Lambertsen, 2006/12/23
- Re: GCC optimizes integer overflow: bug or feature?, Denis Vlasenko, 2006/12/23
- Re: GCC optimizes integer overflow: bug or feature?, Rask Ingemann Lambertsen, 2006/12/23
- Re: GCC optimizes integer overflow: bug or feature?, Gabriel Dos Reis, 2006/12/20
- Re: GCC optimizes integer overflow: bug or feature?, Robert Dewar, 2006/12/20
- Message not available
- Re: GCC optimizes integer overflow: bug or feature?, Paolo Bonzini, 2006/12/21
- Re: GCC optimizes integer overflow: bug or feature?, Paul Eggert, 2006/12/21
- Re: GCC optimizes integer overflow: bug or feature?, Joseph S. Myers, 2006/12/21
- Re: GCC optimizes integer overflow: bug or feature?,
Paul Eggert <=
- Re: GCC optimizes integer overflow: bug or feature?, Ian Lance Taylor, 2006/12/21
- Re: GCC optimizes integer overflow: bug or feature?, Joseph S. Myers, 2006/12/21
- Re: GCC optimizes integer overflow: bug or feature?, Paul Eggert, 2006/12/21
- Re: GCC optimizes integer overflow: bug or feature?, Gabriel Dos Reis, 2006/12/21
- Re: GCC optimizes integer overflow: bug or feature?, Paolo Bonzini, 2006/12/22
- Re: GCC optimizes integer overflow: bug or feature?, Paolo Bonzini, 2006/12/22
- Re: GCC optimizes integer overflow: bug or feature?, Paul Eggert, 2006/12/29
- Message not available
- Re: GCC optimizes integer overflow: bug or feature?, Toon Moene, 2006/12/27
- Re: GCC optimizes integer overflow: bug or feature?, Joe Buck, 2006/12/20
- Re: GCC optimizes integer overflow: bug or feature?, Andrew Haley, 2006/12/20