softfloat: Move return_nan to softfloat-parts.c.inc

At the same time, convert to pointers, rename to return_nan$N
and define a macro for return_nan using QEMU_GENERIC.

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

fpu/softfloat-parts.c.inc

@@ -0,0 +1,37 @@
+/*
+ * QEMU float support
+ *
+ * The code in this source file is derived from release 2a of the SoftFloat
+ * IEC/IEEE Floating-point Arithmetic Package. Those parts of the code (and
+ * some later contributions) are provided under that license, as detailed below.
+ * It has subsequently been modified by contributors to the QEMU Project,
+ * so some portions are provided under:
+ *  the SoftFloat-2a license
+ *  the BSD license
+ *  GPL-v2-or-later
+ *
+ * Any future contributions to this file after December 1st 2014 will be
+ * taken to be licensed under the Softfloat-2a license unless specifically
+ * indicated otherwise.
+ */
+
+static void partsN(return_nan)(FloatPartsN *a, float_status *s)
+{
+    switch (a->cls) {
+    case float_class_snan:
+        float_raise(float_flag_invalid, s);
+        if (s->default_nan_mode) {
+            parts_default_nan(a, s);
+        } else {
+            parts_silence_nan(a, s);
+        }
+        break;
+    case float_class_qnan:
+        if (s->default_nan_mode) {
+            parts_default_nan(a, s);
+        }
+        break;
+    default:
+        g_assert_not_reached();
+    }
+}

fpu/softfloat.c

@@ -709,6 +709,10 @@ static float128 float128_pack_raw(const FloatParts128 *p)
 #define parts_default_nan(P, S)    PARTS_GENERIC_64_128(default_nan, P)(P, S)
 #define parts_silence_nan(P, S)    PARTS_GENERIC_64_128(silence_nan, P)(P, S)
 
+static void parts64_return_nan(FloatParts64 *a, float_status *s);
+static void parts128_return_nan(FloatParts128 *a, float_status *s);
+
+#define parts_return_nan(P, S)     PARTS_GENERIC_64_128(return_nan, P)(P, S)
 
 /*
  * Helper functions for softfloat-parts.c.inc, per-size operations.
@@ -915,22 +919,6 @@ static FloatParts64 round_canonical(FloatParts64 p, float_status *s,
     return p;
 }
 
-static FloatParts64 return_nan(FloatParts64 a, float_status *s)
-{
-    g_assert(is_nan(a.cls));
-    if (is_snan(a.cls)) {
-        float_raise(float_flag_invalid, s);
-        if (!s->default_nan_mode) {
-            parts_silence_nan(&a, s);
-            return a;
-        }
-    } else if (!s->default_nan_mode) {
-        return a;
-    }
-    parts_default_nan(&a, s);
-    return a;
-}
-
 static FloatParts64 pick_nan(FloatParts64 a, FloatParts64 b, float_status *s)
 {
     if (is_snan(a.cls) || is_snan(b.cls)) {
@@ -992,6 +980,21 @@ static FloatParts64 pick_nan_muladd(FloatParts64 a, FloatParts64 b, FloatParts64
     return a;
 }
 
+#define partsN(NAME)   parts64_##NAME
+#define FloatPartsN    FloatParts64
+
+#include "softfloat-parts.c.inc"
+
+#undef  partsN
+#undef  FloatPartsN
+#define partsN(NAME)   parts128_##NAME
+#define FloatPartsN    FloatParts128
+
+#include "softfloat-parts.c.inc"
+
+#undef  partsN
+#undef  FloatPartsN
+
 /*
  * Pack/unpack routines with a specific FloatFmt.
  */
@@ -2066,7 +2069,7 @@ static FloatParts64 float_to_float(FloatParts64 a, const FloatFmt *dstf,
             break;
         }
     } else if (is_nan(a.cls)) {
-        return return_nan(a, s);
+        parts_return_nan(&a, s);
     }
     return a;
 }
@@ -2195,7 +2198,8 @@ static FloatParts64 round_to_int(FloatParts64 a, FloatRoundMode rmode,
     switch (a.cls) {
     case float_class_qnan:
     case float_class_snan:
-        return return_nan(a, s);
+        parts_return_nan(&a, s);
+        break;
 
     case float_class_zero:
     case float_class_inf:
@@ -3591,7 +3595,7 @@ FloatRelation bfloat16_compare_quiet(bfloat16 a, bfloat16 b, float_status *s)
 static FloatParts64 scalbn_decomposed(FloatParts64 a, int n, float_status *s)
 {
     if (unlikely(is_nan(a.cls))) {
-        return return_nan(a, s);
+        parts_return_nan(&a, s);
     }
     if (a.cls == float_class_normal) {
         /* The largest float type (even though not supported by FloatParts64)
@@ -3659,7 +3663,8 @@ static FloatParts64 sqrt_float(FloatParts64 a, float_status *s, const FloatFmt *
     int bit, last_bit;
 
     if (is_nan(a.cls)) {
-        return return_nan(a, s);
+        parts_return_nan(&a, s);
+        return a;
     }
     if (a.cls == float_class_zero) {
         return a;  /* sqrt(+-0) = +-0 */