fpu: Return struct from parts{64,128}_scalbn

At the same time, export.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

fpu/softfloat-parts.c.inc

@@ -1633,22 +1633,24 @@ FloatRelation partsN(compare)(const FloatPartsN *a, const FloatPartsN *b,
 /*
  * Multiply A by 2 raised to the power N.
  */
-static void partsN(scalbn)(FloatPartsN *a, int n, float_status *s)
+FloatPartsN partsN(scalbn)(const FloatPartsN *a, int n, float_status *s)
 {
     switch (a->cls) {
     case float_class_snan:
     case float_class_qnan:
-        *a = partsN(return_nan)(a, s);
-        break;
+        return partsN(return_nan)(a, s);
     case float_class_zero:
     case float_class_inf:
-        break;
+        return *a;
     case float_class_denormal:
         float_raise(float_flag_input_denormal_used, s);
         /* fall through */
     case float_class_normal:
-        a->exp += MIN(MAX(n, -0x10000), 0x10000);
-        break;
+        {
+            FloatPartsN r = *a;
+            r.exp += MIN(MAX(n, -0x10000), 0x10000);
+            return r;
+        }
     default:
         g_assert_not_reached();
     }

fpu/softfloat.c

@@ -1910,7 +1910,7 @@ float16 float16_muladd_scalbn(float16 a, float16 b, float16 c,
 
     /* Before rounding, scale. */
     if (scale) {
-        parts64_scalbn(pr, scale, status);
+        *pr = parts64_scalbn(pr, scale, status);
     }
     parts64_uncanon(pr, status, &float16_params, false);
     /* After rounding, apply negate result, especially for -0.0. */
@@ -1937,7 +1937,7 @@ float32_muladd_scalbn(float32 a, float32 b, float32 c,
 
     /* Before rounding, scale. */
     if (scale) {
-        parts64_scalbn(pr, scale, status);
+        *pr = parts64_scalbn(pr, scale, status);
     }
     parts64_uncanon(pr, status, &float32_params, false);
     /* After rounding, apply negate result, especially for -0.0. */
@@ -1958,7 +1958,7 @@ float64_muladd_scalbn(float64 a, float64 b, float64 c,
 
     /* Before rounding, scale. */
     if (scale) {
-        parts64_scalbn(pr, scale, status);
+        *pr = parts64_scalbn(pr, scale, status);
     }
     parts64_uncanon(pr, status, &float64_params, false);
     /* After rounding, apply negate result, especially for -0.0. */
@@ -4312,7 +4312,7 @@ float16 float16_scalbn(float16 a, int n, float_status *status)
 {
     FloatParts64 p = float16_unpack_canonical(a, status);
 
-    parts64_scalbn(&p, n, status);
+    p = parts64_scalbn(&p, n, status);
     return float16_round_pack_canonical(&p, status);
 }
 
@@ -4320,7 +4320,7 @@ float32 float32_scalbn(float32 a, int n, float_status *status)
 {
     FloatParts64 p = float32_unpack_canonical(a, status);
 
-    parts64_scalbn(&p, n, status);
+    p = parts64_scalbn(&p, n, status);
     return float32_round_pack_canonical(&p, status);
 }
 
@@ -4328,7 +4328,7 @@ float64 float64_scalbn(float64 a, int n, float_status *status)
 {
     FloatParts64 p = float64_unpack_canonical(a, status);
 
-    parts64_scalbn(&p, n, status);
+    p = parts64_scalbn(&p, n, status);
     return float64_round_pack_canonical(&p, status);
 }
 
@@ -4336,7 +4336,7 @@ bfloat16 bfloat16_scalbn(bfloat16 a, int n, float_status *status)
 {
     FloatParts64 p = bfloat16_unpack_canonical(a, status);
 
-    parts64_scalbn(&p, n, status);
+    p = parts64_scalbn(&p, n, status);
     return bfloat16_round_pack_canonical(&p, status);
 }
 
@@ -4344,7 +4344,7 @@ float128 float128_scalbn(float128 a, int n, float_status *status)
 {
     FloatParts128 p = float128_unpack_canonical(a, status);
 
-    parts128_scalbn(&p, n, status);
+    p = parts128_scalbn(&p, n, status);
     return float128_round_pack_canonical(&p, status);
 }
 
@@ -4355,7 +4355,7 @@ floatx80 floatx80_scalbn(floatx80 a, int n, float_status *status)
     if (!floatx80_unpack_canonical(&p, a, status)) {
         return floatx80_default_nan(status);
     }
-    parts128_scalbn(&p, n, status);
+    p = parts128_scalbn(&p, n, status);
     return floatx80_round_pack_canonical(&p, status);
 }
 

include/fpu/softfloat-parts.h

@@ -214,4 +214,7 @@ FloatParts128 parts128_round_to_int(const FloatParts128 *a,
 FloatParts64 parts64_round_to_fmt(const FloatParts64 *p, float_status *s,
                                   const FloatFmt *fmt);
 
+FloatParts64 parts64_scalbn(const FloatParts64 *a, int n, float_status *s);
+FloatParts128 parts128_scalbn(const FloatParts128 *a, int n, float_status *s);
+
 #endif