here is some example code that shows what ksh93/ast use for printing nan
on systems that support both isnan() and signbit()
---
#include <stdio.h>
#include <math.h>
int
main()
{
long double v;
long double z = 0.0;
v = z / z;
printf("isnan=%d signbit=%d %Lg\n", !!isnan(v), !!signbit(v), v);
v = -v;
printf("isnan=%d signbit=%d %Lg\n", !!isnan(v), !!signbit(v), v);
return 0;
}
---
from a few tests it seems that it may be an x86 issue
for the ast stdio
on non-x86 systems
isnan=1 signbit=0 nan
isnan=1 signbit=1 -nan
and on x86 systems (linux solaris)
isnan=1 signbit=1 -nan
isnan=1 signbit=0 nan
On Sat, 3 Apr 2010 17:17:26 +0200 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?= wrote:
> #include <stdio.h>
> #include <stdlib.h>
> #include <math.h>
> int main()
> {
> long double a;
> long double b;
>
> a=0.L;
> b=0.L;
>
> printf ("%Lf\n", a/b);
> return 0;
> }
> prints
> -NaN on i386 and NaN on SPARC. I believe this is a compiler bug in Sun
> Studio cc.
> Olga
> On Sat, Apr 3, 2010 at 3:58 PM, Chris Pickett
> <[email protected]> wrote:
> > We've been debugging a weired problem on Solaris/Intel this week. It
> > turns out that print -- $(( 0./0. )) returns nan on SPARC but -nan on
> > Intel. Is this a bug or a difference in the underlying floating point
> > data type representation?
> >
> > Chris
> > --
> > ^---^
> > (@)v(@) Chris Pickett
> > | / IT consultant
> > ===m==m=== [email protected]
> > _______________________________________________
> > ksh93-integration-discuss mailing list
> > [email protected]
> > http://mail.opensolaris.org/mailman/listinfo/ksh93-integration-discuss
> >
> --
> , _ _ ,
> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
> .----'-/`-/ [email protected] \-`\-'----.
> `'-..-| / Solaris/BSD//C/C++ programmer \ |-..-'`
> /\/\ /\/\
> `--` `--`
> _______________________________________________
> ksh93-integration-discuss mailing list
> [email protected]
> http://mail.opensolaris.org/mailman/listinfo/ksh93-integration-discuss
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