softfloat: Name rounding mode enum

Give the previously unnamed enum a typedef name.  Use the packed
attribute so that we do not affect the layout of the float_status
struct.  Use it in the prototypes of relevant functions.

Adjust switch statements as necessary to avoid compiler warnings.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 34 insertions, 23 deletions

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 65d457a548..93d8a03de6 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -759,6 +759,8 @@ static FloatParts round_canonical(FloatParts p, float_status *s,
                 case float_round_to_odd:
                     inc = frac & frac_lsb ? 0 : round_mask;
                     break;
+                default:
+                    break;
                 }
                 flags |= float_flag_inexact;
                 frac += inc;
@@ -1928,7 +1930,7 @@ float32 float64_to_float32(float64 a, float_status *s)
  * Arithmetic.
  */
 
-static FloatParts round_to_int(FloatParts a, int rmode,
+static FloatParts round_to_int(FloatParts a, FloatRoundMode rmode,
                                int scale, float_status *s)
 {
     switch (a.cls) {
@@ -2061,8 +2063,8 @@ float64 float64_round_to_int(float64 a, float_status *s)
  * is returned.
 */
 
-static int64_t round_to_int_and_pack(FloatParts in, int rmode, int scale,
-                                     int64_t min, int64_t max,
+static int64_t round_to_int_and_pack(FloatParts in, FloatRoundMode rmode,
+                                     int scale, int64_t min, int64_t max,
                                      float_status *s)
 {
     uint64_t r;
@@ -2107,63 +2109,63 @@ static int64_t round_to_int_and_pack(FloatParts in, int rmode, int scale,
     }
 }
 
-int16_t float16_to_int16_scalbn(float16 a, int rmode, int scale,
+int16_t float16_to_int16_scalbn(float16 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float16_unpack_canonical(a, s),
                                  rmode, scale, INT16_MIN, INT16_MAX, s);
 }
 
-int32_t float16_to_int32_scalbn(float16 a, int rmode, int scale,
+int32_t float16_to_int32_scalbn(float16 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float16_unpack_canonical(a, s),
                                  rmode, scale, INT32_MIN, INT32_MAX, s);
 }
 
-int64_t float16_to_int64_scalbn(float16 a, int rmode, int scale,
+int64_t float16_to_int64_scalbn(float16 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float16_unpack_canonical(a, s),
                                  rmode, scale, INT64_MIN, INT64_MAX, s);
 }
 
-int16_t float32_to_int16_scalbn(float32 a, int rmode, int scale,
+int16_t float32_to_int16_scalbn(float32 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float32_unpack_canonical(a, s),
                                  rmode, scale, INT16_MIN, INT16_MAX, s);
 }
 
-int32_t float32_to_int32_scalbn(float32 a, int rmode, int scale,
+int32_t float32_to_int32_scalbn(float32 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float32_unpack_canonical(a, s),
                                  rmode, scale, INT32_MIN, INT32_MAX, s);
 }
 
-int64_t float32_to_int64_scalbn(float32 a, int rmode, int scale,
+int64_t float32_to_int64_scalbn(float32 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float32_unpack_canonical(a, s),
                                  rmode, scale, INT64_MIN, INT64_MAX, s);
 }
 
-int16_t float64_to_int16_scalbn(float64 a, int rmode, int scale,
+int16_t float64_to_int16_scalbn(float64 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float64_unpack_canonical(a, s),
                                  rmode, scale, INT16_MIN, INT16_MAX, s);
 }
 
-int32_t float64_to_int32_scalbn(float64 a, int rmode, int scale,
+int32_t float64_to_int32_scalbn(float64 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float64_unpack_canonical(a, s),
                                  rmode, scale, INT32_MIN, INT32_MAX, s);
 }
 
-int64_t float64_to_int64_scalbn(float64 a, int rmode, int scale,
+int64_t float64_to_int64_scalbn(float64 a, FloatRoundMode rmode, int scale,
                                 float_status *s)
 {
     return round_to_int_and_pack(float64_unpack_canonical(a, s),
@@ -2273,8 +2275,9 @@ int64_t float64_to_int64_round_to_zero(float64 a, float_status *s)
  *  flag.
  */
 
-static uint64_t round_to_uint_and_pack(FloatParts in, int rmode, int scale,
-                                       uint64_t max, float_status *s)
+static uint64_t round_to_uint_and_pack(FloatParts in, FloatRoundMode rmode,
+                                       int scale, uint64_t max,
+                                       float_status *s)
 {
     int orig_flags = get_float_exception_flags(s);
     FloatParts p = round_to_int(in, rmode, scale, s);
@@ -2319,63 +2322,63 @@ static uint64_t round_to_uint_and_pack(FloatParts in, int rmode, int scale,
     }
 }
 
-uint16_t float16_to_uint16_scalbn(float16 a, int rmode, int scale,
+uint16_t float16_to_uint16_scalbn(float16 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float16_unpack_canonical(a, s),
                                   rmode, scale, UINT16_MAX, s);
 }
 
-uint32_t float16_to_uint32_scalbn(float16 a, int rmode, int scale,
+uint32_t float16_to_uint32_scalbn(float16 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float16_unpack_canonical(a, s),
                                   rmode, scale, UINT32_MAX, s);
 }
 
-uint64_t float16_to_uint64_scalbn(float16 a, int rmode, int scale,
+uint64_t float16_to_uint64_scalbn(float16 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float16_unpack_canonical(a, s),
                                   rmode, scale, UINT64_MAX, s);
 }
 
-uint16_t float32_to_uint16_scalbn(float32 a, int rmode, int scale,
+uint16_t float32_to_uint16_scalbn(float32 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float32_unpack_canonical(a, s),
                                   rmode, scale, UINT16_MAX, s);
 }
 
-uint32_t float32_to_uint32_scalbn(float32 a, int rmode, int scale,
+uint32_t float32_to_uint32_scalbn(float32 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float32_unpack_canonical(a, s),
                                   rmode, scale, UINT32_MAX, s);
 }
 
-uint64_t float32_to_uint64_scalbn(float32 a, int rmode, int scale,
+uint64_t float32_to_uint64_scalbn(float32 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float32_unpack_canonical(a, s),
                                   rmode, scale, UINT64_MAX, s);
 }
 
-uint16_t float64_to_uint16_scalbn(float64 a, int rmode, int scale,
+uint16_t float64_to_uint16_scalbn(float64 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float64_unpack_canonical(a, s),
                                   rmode, scale, UINT16_MAX, s);
 }
 
-uint32_t float64_to_uint32_scalbn(float64 a, int rmode, int scale,
+uint32_t float64_to_uint32_scalbn(float64 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float64_unpack_canonical(a, s),
                                   rmode, scale, UINT32_MAX, s);
 }
 
-uint64_t float64_to_uint64_scalbn(float64 a, int rmode, int scale,
+uint64_t float64_to_uint64_scalbn(float64 a, FloatRoundMode rmode, int scale,
                                   float_status *s)
 {
     return round_to_uint_and_pack(float64_unpack_canonical(a, s),
@@ -5715,6 +5718,11 @@ floatx80 floatx80_round_to_int(floatx80 a, float_status *status)
             return
                   aSign ? packFloatx80( 1, 0, 0 )
                 : packFloatx80( 0, 0x3FFF, UINT64_C(0x8000000000000000));
+
+        case float_round_to_zero:
+            break;
+        default:
+            g_assert_not_reached();
         }
         return packFloatx80( aSign, 0, 0 );
     }
@@ -7047,6 +7055,9 @@ float128 float128_round_to_int(float128 a, float_status *status)
 
             case float_round_to_odd:
                 return packFloat128(aSign, 0x3FFF, 0, 0);
+
+            case float_round_to_zero:
+                break;
             }
             return packFloat128( aSign, 0, 0, 0 );
         }