Bug#781892: (Hardware?) problem with denormal values on mipsel

Hi,

On Fri, May 22, 2015 at 11:00:18PM +0100, James Cowgill wrote:
> On Sat, 2015-05-23 at 00:04 +0300, Aaro Koskinen wrote:
> > On Fri, May 22, 2015 at 05:27:14PM +0100, James Cowgill wrote:
> > > Yep it's a hardware problem. The following assembly dies (raises SIGILL)
> > > at 'sqrt.s' on the Loongsons and works everywhere else:
> > > 
> > > ===
> > >         .set mips2
> > >         .text
> > >         .global main
> > >         .type main, @function
> > > main:
> > >         lui $t0, %hi(value)
> > >         lwc1 $f0, %lo(value)($t0)
> > >         nop
> > >         sqrt.s $f0, $f0
> > >         jr $ra
> > > 
> > >         .data
> > > value:
> > >         .float 1.1342362e-39
> > > ===
> > 
> > Is this a standalone reproducer program for the problem? Because
> > I tried it on on my Loongson box and didn't get any SIGILL...
> 
> It should be. I tried it on some 3A machines at work and it crashed
> there (and then some other machines which didn't crash). There's a 2F I
> can try on Tuesday.

My Loongson is 2F...

> Does the original gfortran code crash for you?

I don't have gfortran available on my system.

A.