softfloat: Use goto for default nan case in pick_nan_muladd

Remove "3" as a special case for which and simply
branch to return the desired value.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20241203203949.483774-4-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc
index c1a97c35b206387f137b0d4907ed934e0a615ffe..be7e93127d46fbe9e58ea052f71ba291c2155784 100644 (file)
--- a/fpu/softfloat-parts.c.inc
+++ b/fpu/softfloat-parts.c.inc
@@ -85,7 +85,7 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
          * But if we're not in default-NaN mode then the target must
          * specify.
          */
-        which = 3;
+        goto default_nan;
     } else if (infzero) {
         /*
          * Inf * 0 + NaN -- some implementations return the
@@ -93,17 +93,18 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
          */
         switch (s->float_infzeronan_rule) {
         case float_infzeronan_dnan_never:
-            which = 2;
             break;
         case float_infzeronan_dnan_always:
-            which = 3;
-            break;
+            goto default_nan;
         case float_infzeronan_dnan_if_qnan:
-            which = is_qnan(c->cls) ? 3 : 2;
+            if (is_qnan(c->cls)) {
+                goto default_nan;
+            }
             break;
         default:
             g_assert_not_reached();
         }
+        which = 2;
     } else {
         FloatClass cls[3] = { a->cls, b->cls, c->cls };
         Float3NaNPropRule rule = s->float_3nan_prop_rule;
@@ -123,11 +124,6 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
         }
     }
 
-    if (which == 3) {
-        parts_default_nan(a, s);
-        return a;
-    }
-
     switch (which) {
     case 0:
         break;
@@ -144,6 +140,10 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
         parts_silence_nan(a, s);
     }
     return a;
+
+ default_nan:
+    parts_default_nan(a, s);
+    return a;
 }
 
 /*