RE: [linuxsh-dev] Re: Floating point problem

[Bao C. H. <ba...@se...>]

-static works
-O2 does not work (crash!)

Following is a gdb session when it crashes.  Note the
"correct" values of dum = -0.95105654 and status = 1!

Breakpoint 1, main () at test.c:13
13              status = fscanf(fptr,"%f", &dum);
(gdb) n
14              printf("\n status=%x\n", (int)status);
(gdb) print dum
$3 = -0.95105654
(gdb) print status
$4 = 1
(gdb) n

 status=%x

 dum=%f
|AGNUyyyyyyyy?AU@o@@0@L@h@"@U.Y?
A@o@H@                          `@
1
 ?AT@o@

        ?yyoO@yyyo?yyo?@GCC: (GNU) 2.97 20001120 (experimental)GCC: (GNU)
2.97 2
0001120 (experimental)GCC: (GNU) 2.97 20001120 (experimental)GCC: (GNU) 2.97
200
01120 (experimental)GCC: (GNU) 2.97 20001120 (experimental)GCC: (GNU) 2.97
20001
120 (experimental)?@""-main?@?@test.c/scratch/hotspare/home/baoGNU C 2.97
200011
20 (experimental)?quot?#rem?long long inN__valM?#AAunsigned intint
__sched_paramE__sched_priorityFN#       M_pthread_fastlock

I am actually glad that somebody else besides us also sees the
problem.

Thanks.
Bao

> -----Original Message-----
> From: lin...@li...
> [mailto:lin...@li...]On Behalf Of
> kaz Kojima
> Sent: Wednesday, August 15, 2001 6:17 AM
> To: lin...@li...
> Subject: [linuxsh-dev] Re: Floating point problem
>
>
> Stuart Menefy <Stu...@st...> wrote:
> > Yep, I see the same problem here.
> >
> > This is using the RPMS from SourceForge:
> >   gcc 2.97 (20001120 + patches)
> >   glibc 2.2.2
> >   kernel 2.4.7-pre6
> > basically the same set.
> >
> > One other oddity, the garbage which is printed at the end
> doesn't occur
> > when output is redirected to a file, however the floating
> point values
> > print as 0.00000 rather than the negative number.
> >
> > Strange
>
> Indeed.
>
> One possibility is the problem on changing double/float mode of SH-4
> FPU. Is the result same with the option -O2 or -static? I suspect that
> the wrong FPU mode gives such curious behavior.
>
> 	kaz
>
> _______________________________________________
> linuxsh-dev mailing list
> lin...@li...
> http://lists.sourceforge.net/lists/listinfo/linuxsh-dev
>