Re: possible error for cross-gcc-2.3.5-glibc-2.3.2?

[Lennert Buytenhek <buytenh at wantstofly dot org>]

On Sun, Oct 10, 2004 at 10:16:13AM -0700, Dan Kegel wrote:

> Nope.  I just know that the ARM ABI specifies hardware FP, so
> I figure they must have gotten the FP emulation bugs out of
> the way a long time ago.

If you're on little-endian, that's probably true.  There are not
many folks using big-endian ARM, so things there are still kind-of
broken.

For example, this afternoon I was wondering why ntpd was constantly
adjusting my clock in the wrong direction, and then found this
(on big-endian.)  So you see that at least one really obvious bug
in kernel fp emulation went undetected for a couple of years.
Actually, before a patch went into 2.6.9-rc2 to fix fp byte order,
hardfloat on big-endian didn't work at all.

I don't think linux even supports any ARM CPUs with a hardware FP
unit, please correct me if I'm wrong on that.

[root@enp2611 tmp]# cat x.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
        volatile double x;

        x = 1.0;
        printf("%f\n", x);

        x = -x;
        printf("%f\n", x);

        return 0;
}
[root@enp2611 tmp]# gcc -Wall -o x x.c
[root@enp2611 tmp]# ./x
1.000000
1.000000
[root@enp2611 tmp]# 


--L

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