Re: Massive performance regression from switching to gcc 4.5

2010-06-28 Thread Richard B. Kreckel
no idea what's up yet. -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Re: Massive performance regression from switching to gcc 4.5

2010-06-27 Thread Richard B. Kreckel
differences between 4.3 and 4.4. FP intensive code could be also affected by: This code isn't using floating-point. -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Re: Massive performance regression from switching to gcc 4.5

2010-06-26 Thread Richard B. Kreckel
compiling with -O2. And there hasn't been a measurable performance differences between 4.3 and 4.4. -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Re: changing configure to default to gcc -g -O2 -fwrapv ...

2006-12-29 Thread Richard B. Kreckel
that correctness. Bottom line: without such a warning, -fwrapv should be the default and should not be turned off by any -O option. Regards -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Re: GCC optimizes integer overflow: bug or feature?

2006-12-21 Thread Richard B. Kreckel
, but assumed by many of its users, unless explicitly told to follow that standard (with -fwrapv). That is A Bad Idea. Cheers -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Re: GCC optimizes integer overflow: bug or feature?

2006-12-20 Thread Richard B. Kreckel
of the analogy with IEEE real arithmetic. -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Re: GCC optimizes integer overflow: bug or feature?

2006-12-20 Thread Richard B. Kreckel
Marcin Dalecki wrote: On 2006-12-20, at 22:48, Richard B. Kreckel wrote: 2) Signed types are not an algebra, they are not even a ring, at least when their elements are interpreted in the canonical way as integer numbers. (Heck, what are they?) You are apparently using a different

Re: GCC optimizes integer overflow: bug or feature? (was: avoid integer overflow in mktime.m4)

2006-12-19 Thread Richard B. Kreckel
programs which depend on wrapping signed integers. Silently breaking LIA-1 semantics is imprudent. -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Re: Language Changes in Bug-fix Releases?

2005-09-07 Thread Richard B. Kreckel
accidentally fire that ballistic rocket. (If it really can, then you're having a truck load of other problems besides code quality.) Saludos -richy. -- Richard B. Kreckel http://www.ginac.de/~kreckel/

Language Changes in Bug-fix Releases?

2005-09-02 Thread Richard B. Kreckel
. [0] http://gcc.gnu.org/develop.html [1] I don't talk about distros that use the latest version from HEAD. Screw them! -- Richard B. Kreckel http://www.ginac.de/~kreckel/