target/ppc: Set Float3NaNPropRule explicitly

Set the Float3NaNPropRule explicitly for PPC, and remove the
ifdef from pickNaNMulAdd().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-20-peter.maydell@linaro.org

diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc
index d610f460026c0dddfe216f3ff088f4164203f7c2..173b9eadb572c5a8a8dbded2c6c152e16739edc4 100644 (file)
--- a/fpu/softfloat-specialize.c.inc
+++ b/fpu/softfloat-specialize.c.inc
@@ -511,12 +511,6 @@ static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls,
         } else {
             rule = float_3nan_prop_s_cab;
         }
-#elif defined(TARGET_PPC)
-        /*
-         * If fRA is a NaN return it; otherwise if fRB is a NaN return it;
-         * otherwise return fRC. Note that muladd on PPC is (fRA * fRC) + frB
-         */
-        rule = float_3nan_prop_acb;
 #elif defined(TARGET_S390X)
         rule = float_3nan_prop_s_abc;
 #elif defined(TARGET_SPARC)

diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index f18908a643ae5bd11dfbfc10c3a19d6e524568c0..eb9d7b13701400a7a5452dde8bf5fb89c1d6f3a0 100644 (file)
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -7270,6 +7270,14 @@ static void ppc_cpu_reset_hold(Object *obj, ResetType type)
      */
     set_float_2nan_prop_rule(float_2nan_prop_ab, &env->fp_status);
     set_float_2nan_prop_rule(float_2nan_prop_ab, &env->vec_status);
+    /*
+     * NaN propagation for fused multiply-add:
+     * if fRA is a NaN return it; otherwise if fRB is a NaN return it;
+     * otherwise return fRC. Note that muladd on PPC is (fRA * fRC) + frB
+     * whereas QEMU labels the operands as (a * b) + c.
+     */
+    set_float_3nan_prop_rule(float_3nan_prop_acb, &env->fp_status);
+    set_float_3nan_prop_rule(float_3nan_prop_acb, &env->vec_status);
     /*
      * For PPC, the (inf,zero,qnan) case sets InvalidOp, but we prefer
      * to return an input NaN if we have one (ie c) rather than generating