softfloat: Inline pickNaNMulAdd

Inline pickNaNMulAdd into its only caller.  This makes
one assert redundant with the immediately preceding IF.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20241203203949.483774-3-richard.henderson@linaro.org
[PMM: keep comment from old code in new location]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

fpu/softfloat-parts.c.inc

@@ -79,9 +79,48 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
     }
 
     if (s->default_nan_mode) {
+        /*
+         * We guarantee not to require the target to tell us how to
+         * pick a NaN if we're always returning the default NaN.
+         * But if we're not in default-NaN mode then the target must
+         * specify.
+         */
         which = 3;
+    } else if (infzero) {
+        /*
+         * Inf * 0 + NaN -- some implementations return the
+         * default NaN here, and some return the input NaN.
+         */
+        switch (s->float_infzeronan_rule) {
+        case float_infzeronan_dnan_never:
+            which = 2;
+            break;
+        case float_infzeronan_dnan_always:
+            which = 3;
+            break;
+        case float_infzeronan_dnan_if_qnan:
+            which = is_qnan(c->cls) ? 3 : 2;
+            break;
+        default:
+            g_assert_not_reached();
+        }
     } else {
-        which = pickNaNMulAdd(a->cls, b->cls, c->cls, infzero, have_snan, s);
+        FloatClass cls[3] = { a->cls, b->cls, c->cls };
+        Float3NaNPropRule rule = s->float_3nan_prop_rule;
+
+        assert(rule != float_3nan_prop_none);
+        if (have_snan && (rule & R_3NAN_SNAN_MASK)) {
+            /* We have at least one SNaN input and should prefer it */
+            do {
+                which = rule & R_3NAN_1ST_MASK;
+                rule >>= R_3NAN_1ST_LENGTH;
+            } while (!is_snan(cls[which]));
+        } else {
+            do {
+                which = rule & R_3NAN_1ST_MASK;
+                rule >>= R_3NAN_1ST_LENGTH;
+            } while (!is_nan(cls[which]));
+        }
     }
 
     if (which == 3) {

fpu/softfloat-specialize.c.inc

@@ -448,60 +448,6 @@ static int pickNaN(FloatClass a_cls, FloatClass b_cls,
     }
 }
 
-/*----------------------------------------------------------------------------
-| Select which NaN to propagate for a three-input operation.
-| For the moment we assume that no CPU needs the 'larger significand'
-| information.
-| Return values : 0 : a; 1 : b; 2 : c; 3 : default-NaN
-*----------------------------------------------------------------------------*/
-static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls,
-                         bool infzero, bool have_snan, float_status *status)
-{
-    FloatClass cls[3] = { a_cls, b_cls, c_cls };
-    Float3NaNPropRule rule = status->float_3nan_prop_rule;
-    int which;
-
-    /*
-     * We guarantee not to require the target to tell us how to
-     * pick a NaN if we're always returning the default NaN.
-     * But if we're not in default-NaN mode then the target must
-     * specify.
-     */
-    assert(!status->default_nan_mode);
-
-    if (infzero) {
-        /*
-         * Inf * 0 + NaN -- some implementations return the default NaN here,
-         * and some return the input NaN.
-         */
-        switch (status->float_infzeronan_rule) {
-        case float_infzeronan_dnan_never:
-            return 2;
-        case float_infzeronan_dnan_always:
-            return 3;
-        case float_infzeronan_dnan_if_qnan:
-            return is_qnan(c_cls) ? 3 : 2;
-        default:
-            g_assert_not_reached();
-        }
-    }
-
-    assert(rule != float_3nan_prop_none);
-    if (have_snan && (rule & R_3NAN_SNAN_MASK)) {
-        /* We have at least one SNaN input and should prefer it */
-        do {
-            which = rule & R_3NAN_1ST_MASK;
-            rule >>= R_3NAN_1ST_LENGTH;
-        } while (!is_snan(cls[which]));
-    } else {
-        do {
-            which = rule & R_3NAN_1ST_MASK;
-            rule >>= R_3NAN_1ST_LENGTH;
-        } while (!is_nan(cls[which]));
-    }
-    return which;
-}
-
 /*----------------------------------------------------------------------------
 | Returns 1 if the double-precision floating-point value `a' is a quiet
 | NaN; otherwise returns 0.