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

[Richard Henderson]

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.


r~