softfloat: Convert float128_default_nan to parts

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

1 files changed, 19 insertions, 0 deletions

diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc
index 5b85b84..c895733 100644
--- a/fpu/softfloat-specialize.c.inc
+++ b/fpu/softfloat-specialize.c.inc
@@ -171,6 +171,25 @@ static void parts64_default_nan(FloatParts64 *p, float_status *status)
     };
 }
 
+static void parts128_default_nan(FloatParts128 *p, float_status *status)
+{
+    /*
+     * Extrapolate from the choices made by parts64_default_nan to fill
+     * in the quad-floating format.  If the low bit is set, assume we
+     * want to set all non-snan bits.
+     */
+    FloatParts64 p64;
+    parts64_default_nan(&p64, status);
+
+    *p = (FloatParts128) {
+        .cls = float_class_qnan,
+        .sign = p64.sign,
+        .exp = INT_MAX,
+        .frac_hi = p64.frac,
+        .frac_lo = -(p64.frac & 1)
+    };
+}
+
 /*----------------------------------------------------------------------------
 | Returns a quiet NaN from a signalling NaN for the deconstructed
 | floating-point parts.