target/arm: Copy entire float_status in is_ebf

Now that float_status has a bunch of fp parameters,
it is easier to copy an existing structure than create
one from scratch.  Begin by copying the structure that
corresponds to the FPSR and make only the adjustments
required for BFloat16 semantics.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20241203203949.483774-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target/arm/tcg/vec_helper.c b/target/arm/tcg/vec_helper.c
index e825d501a225226b5806d3efc3c526fefd719974..ad6f26545ac603bce53711fdc0aedb78a4209987 100644 (file)
--- a/target/arm/tcg/vec_helper.c
+++ b/target/arm/tcg/vec_helper.c
@@ -2813,25 +2813,19 @@ bool is_ebf(CPUARMState *env, float_status *statusp, float_status *oddstatusp)
      * no effect on AArch32 instructions.
      */
     bool ebf = is_a64(env) && env->vfp.fpcr & FPCR_EBF;
-    *statusp = (float_status){
-        .tininess_before_rounding = float_tininess_before_rounding,
-        .float_rounding_mode = float_round_to_odd_inf,
-        .flush_to_zero = true,
-        .flush_inputs_to_zero = true,
-        .default_nan_mode = true,
-    };
 
-    if (ebf) {
-        float_status *fpst = &env->vfp.fp_status;
-        set_flush_to_zero(get_flush_to_zero(fpst), statusp);
-        set_flush_inputs_to_zero(get_flush_inputs_to_zero(fpst), statusp);
-        set_float_rounding_mode(get_float_rounding_mode(fpst), statusp);
+    *statusp = env->vfp.fp_status;
+    set_default_nan_mode(true, statusp);
 
+    if (ebf) {
         /* EBF=1 needs to do a step with round-to-odd semantics */
         *oddstatusp = *statusp;
         set_float_rounding_mode(float_round_to_odd, oddstatusp);
+    } else {
+        set_flush_to_zero(true, statusp);
+        set_flush_inputs_to_zero(true, statusp);
+        set_float_rounding_mode(float_round_to_odd_inf, statusp);
     }
-
     return ebf;
 }