softfloat: Split out parts_uncanon_normal

We will need to treat the non-normal cases of floatx80 specially,
so split out the normal case that we can reuse.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

fpu/softfloat-parts.c.inc

@@ -140,8 +140,8 @@ static void partsN(canonicalize)(FloatPartsN *p, float_status *status,
  * fraction; these bits will be removed. The exponent will be biased
  * by EXP_BIAS and must be bounded by [EXP_MAX-1, 0].
  */
-static void partsN(uncanon)(FloatPartsN *p, float_status *s,
+static void partsN(uncanon_normal)(FloatPartsN *p, float_status *s,
-                            const FloatFmt *fmt)
+                                   const FloatFmt *fmt)
 {
     const int exp_max = fmt->exp_max;
     const int frac_shift = fmt->frac_shift;
@@ -150,33 +150,9 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
     const uint64_t round_mask = fmt->round_mask;
     const uint64_t roundeven_mask = fmt->roundeven_mask;
     uint64_t inc;
-    bool overflow_norm;
+    bool overflow_norm = false;
     int exp, flags = 0;
 
-    if (unlikely(p->cls != float_class_normal)) {
-        switch (p->cls) {
-        case float_class_zero:
-            p->exp = 0;
-            frac_clear(p);
-            return;
-        case float_class_inf:
-            g_assert(!fmt->arm_althp);
-            p->exp = fmt->exp_max;
-            frac_clear(p);
-            return;
-        case float_class_qnan:
-        case float_class_snan:
-            g_assert(!fmt->arm_althp);
-            p->exp = fmt->exp_max;
-            frac_shr(p, fmt->frac_shift);
-            return;
-        default:
-            break;
-        }
-        g_assert_not_reached();
-    }
-
-    overflow_norm = false;
     switch (s->float_rounding_mode) {
     case float_round_nearest_even:
         inc = ((p->frac_lo & roundeven_mask) != frac_lsbm1 ? frac_lsbm1 : 0);
@@ -284,6 +260,35 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
     float_raise(flags, s);
 }
 
+static void partsN(uncanon)(FloatPartsN *p, float_status *s,
+                            const FloatFmt *fmt)
+{
+    if (likely(p->cls == float_class_normal)) {
+        parts_uncanon_normal(p, s, fmt);
+    } else {
+        switch (p->cls) {
+        case float_class_zero:
+            p->exp = 0;
+            frac_clear(p);
+            return;
+        case float_class_inf:
+            g_assert(!fmt->arm_althp);
+            p->exp = fmt->exp_max;
+            frac_clear(p);
+            return;
+        case float_class_qnan:
+        case float_class_snan:
+            g_assert(!fmt->arm_althp);
+            p->exp = fmt->exp_max;
+            frac_shr(p, fmt->frac_shift);
+            return;
+        default:
+            break;
+        }
+        g_assert_not_reached();
+    }
+}
+
 /*
  * Returns the result of adding or subtracting the values of the
  * floating-point values `a' and `b'. The operation is performed

fpu/softfloat.c

@@ -764,6 +764,14 @@ static void parts128_canonicalize(FloatParts128 *p, float_status *status,
 #define parts_canonicalize(A, S, F) \
     PARTS_GENERIC_64_128(canonicalize, A)(A, S, F)
 
+static void parts64_uncanon_normal(FloatParts64 *p, float_status *status,
+                                   const FloatFmt *fmt);
+static void parts128_uncanon_normal(FloatParts128 *p, float_status *status,
+                                    const FloatFmt *fmt);
+
+#define parts_uncanon_normal(A, S, F) \
+    PARTS_GENERIC_64_128(uncanon_normal, A)(A, S, F)
+
 static void parts64_uncanon(FloatParts64 *p, float_status *status,
                             const FloatFmt *fmt);
 static void parts128_uncanon(FloatParts128 *p, float_status *status,