Re: [PATCH 3/3] target/openrisc: Setup FPU for detecting tininess before rounding

[Stafford Horne]

On Wed, May 03, 2023 at 08:37:31AM +0100, Richard Henderson wrote:
> On 5/2/23 19:57, Stafford Horne wrote:
> > OpenRISC defines tininess to be detected before rounding.  Setup qemu to
> > obey this.
> > 
> > Signed-off-by: Stafford Horne <shorne@gmail.com>
> > ---
> >   target/openrisc/cpu.c | 5 +++++
> >   1 file changed, 5 insertions(+)
> > 
> > diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c
> > index 0ce4f796fa..cdbff26fb5 100644
> > --- a/target/openrisc/cpu.c
> > +++ b/target/openrisc/cpu.c
> > @@ -22,6 +22,7 @@
> >   #include "qemu/qemu-print.h"
> >   #include "cpu.h"
> >   #include "exec/exec-all.h"
> > +#include "fpu/softfloat-helpers.h"
> >   #include "tcg/tcg.h"
> >   static void openrisc_cpu_set_pc(CPUState *cs, vaddr value)
> > @@ -90,6 +91,10 @@ static void openrisc_cpu_reset_hold(Object *obj)
> >       s->exception_index = -1;
> >       cpu_set_fpcsr(&cpu->env, 0);
> > +    set_default_nan_mode(1, &cpu->env.fp_status);
> > +    set_float_detect_tininess(float_tininess_before_rounding,
> > +                              &cpu->env.fp_status);
> 
> You don't mention the nan change in the commit message.

Right, and I am not sure I need it.  Let me remove it and run tests again.  I
was just adding it as a few other architectures did who set
float_tininess_before_rounding.

Will clean this up.