gcc-dw2? or fast sjlj-exceptions EH
Tatsuro MATSUOKA
matsuoka@mol.nagoya-u.ac.jp
Mon Sep 10 22:51:00 GMT 2007
Thank you Danny.
My ability is not high enough so that I will discuss your suggestion
in the Octave ML.
Tatsuro MATSUOKA
Danny Smith <dannysmith@clear.net.nz> wrote:
(2007/09/11 07:06)
>At http://www.cygwin.com/ml/cygwin/2007-09/msg00194.html
>
>Tatsuro Matsuoka wrote:
>
>> The best solution, I think, the speed of sjlj-exceptions EH on the
>> cygwin is as fast as that of other platforms.
>>
>
>In the case of octave, I believe that the main cause of slowdown is the
>sjlj EH code generated in prologue of new()
>Does a no-throw override of libary version of these functions help ?
>
>
>Danny
>#ifdef __USING_SJLJ_EXCEPTIONS__
>#define NEW_THROW_SPEC throw()
>#else
>#define NEW_THROW_SPEC throw(std::bad_alloc)
>#endif
>
>#include ...
>
>void *
>operator new (std::size_t sz) NEW_THROW_SPEC
>{
> void *p;
>
> /* malloc (0) is unpredictable; avoid it. */
> if (sz == 0)
> sz = 1;
> p = (void *) malloc (sz);
> while (p == 0)
> {
> new_handler handler = __new_handler;
> if (! handler)
>#ifdef __USING_SJLJ_EXCEPTIONS__
> std::abort();
>#else
> throw bad_alloc();
>#endif
> handler ();
> p = (void *) malloc (sz);
> }
>
> return p;
>}
>
>void *
>operator new[] (std::size_t sz) NEW_THROW_SPEC
>{
> return ::operator new(sz);
>}
>
>
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