From: Eric Botcazou <ebotcazou@libertysurf.fr>
To: Hiroshi Fujishima <hiroshi.fujishima@gmail.com>
Cc: gcc@gcc.gnu.org, Joe Buck <Joe.Buck@synopsys.com>
Subject: Re: isinf
Date: Thu, 14 Jul 2005 06:27:00 -0000 [thread overview]
Message-ID: <200507140759.54024.ebotcazou@libertysurf.fr> (raw)
In-Reply-To: <7cr7e28e13.fsf@gmail.com>
> Oops, the configure script compiling with -O2 optimization.
Clearly not the best option for this kind of tests.
> The compilation of the following code still suceesss.
>
> #include <math.h>
>
> int a;
>
> int
> main ()
> {
> float f = 0.0;
> a = isinf (f);
> return 0;
> }
The compiler knows the answer of isinf (0) so it again optimizes away the
call. Try something like:
int a;
int
main (int argc, char *argv[])
{
a = isinf ((double) argc);
return 0;
}
or additionally compile with -fno-builtin.
--
Eric Botcazou
next prev parent reply other threads:[~2005-07-14 6:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-13 17:07 isinf Hiroshi Fujishima
2005-07-13 19:08 ` isinf Eric Botcazou
2005-07-13 22:32 ` isinf Hiroshi Fujishima
2005-07-13 22:59 ` isinf Eric Botcazou
2005-07-13 23:17 ` isinf Hiroshi Fujishima
2005-07-13 23:29 ` isinf Joe Buck
2005-07-13 23:39 ` isinf Dale Johannesen
2005-07-13 23:48 ` isinf Hiroshi Fujishima
2005-07-14 6:27 ` Eric Botcazou [this message]
2005-07-14 6:52 ` isinf Michael Veksler
2005-07-14 7:33 ` isinf Eric Botcazou
2005-07-14 7:56 ` isinf Michael Veksler
2005-07-14 8:59 ` isinf Andreas Schwab
2005-07-14 9:10 ` isinf Eric Botcazou
2005-07-14 9:27 ` isinf Hiroshi Fujishima
2005-07-14 9:35 ` isinf Jakub Jelinek
2005-07-14 9:47 ` isinf Andreas Schwab
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