[v2,for-10.0,39/54] target/alpha: Set default NaN pattern explicitly

Commit Message

Peter Maydell Dec. 2, 2024, 1:13 p.m. UTC

Set the default NaN pattern explicitly for the alpha target.

Signed-off-by: Peter Maydell <[e-mail]>
---
 target/alpha/cpu.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Richard Henderson Dec. 2, 2024, 5:28 p.m. UTC | #1

On 12/2/24 07:13, Peter Maydell wrote:
> Set the default NaN pattern explicitly for the alpha target.
> 
> Signed-off-by: Peter Maydell <[e-mail]>
> ---
>   target/alpha/cpu.c | 2 ++
>   1 file changed, 2 insertions(+)

Reviewed-by: Richard Henderson <[e-mail]>

r~

> 
> diff --git a/target/alpha/cpu.c b/target/alpha/cpu.c
> index 5d75c941f7a..70f67e6fd4e 100644
> --- a/target/alpha/cpu.c
> +++ b/target/alpha/cpu.c
> @@ -199,6 +199,8 @@ static void alpha_cpu_initfn(Object *obj)
>        * operand in Fa. That is float_2nan_prop_ba.
>        */
>       set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status);
> +    /* Default NaN: sign bit clear, msb frac bit set */
> +    set_float_default_nan_pattern(0b01000000, &env->fp_status);
>   #if defined(CONFIG_USER_ONLY)
>       env->flags = ENV_FLAG_PS_USER | ENV_FLAG_FEN;
>       cpu_alpha_store_fpcr(env, (uint64_t)(FPCR_INVD | FPCR_DZED | FPCR_OVFD

Patch

diff --git a/target/alpha/cpu.c b/target/alpha/cpu.c
index 5d75c941f7a..70f67e6fd4e 100644
--- a/target/alpha/cpu.c
+++ b/target/alpha/cpu.c
@@ -199,6 +199,8 @@  static void alpha_cpu_initfn(Object *obj)
      * operand in Fa. That is float_2nan_prop_ba.
      */
     set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status);
+    /* Default NaN: sign bit clear, msb frac bit set */
+    set_float_default_nan_pattern(0b01000000, &env->fp_status);
 #if defined(CONFIG_USER_ONLY)
     env->flags = ENV_FLAG_PS_USER | ENV_FLAG_FEN;
     cpu_alpha_store_fpcr(env, (uint64_t)(FPCR_INVD | FPCR_DZED | FPCR_OVFD