math: sin cos cleanup

[musl] / src / math / sincosl.c

diff --git a/src/math/sincosl.c b/src/math/sincosl.c
index d632fe6..5db69bd 100644 (file)
--- a/src/math/sincosl.c
+++ b/src/math/sincosl.c
@@ -10,27 +10,29 @@ void sincosl(long double x, long double *sin, long double *cos)
 void sincosl(long double x, long double *sin, long double *cos)
 {
        union IEEEl2bits u;
-       int n;
+       unsigned n;
        long double y[2], s, c;
 
        u.e = x;
        u.bits.sign = 0;
 
-       /* x = +-0 or subnormal */
-       if (!u.bits.exp) {
-               *sin = x;
-               *cos = 1.0;
-               return;
-       }
-
        /* x = nan or inf */
        if (u.bits.exp == 0x7fff) {
                *sin = *cos = x - x;
                return;
        }
 
-       /* |x| < pi/4 */
+       /* |x| < (double)pi/4 */
        if (u.e < M_PI_4) {
+               /* |x| < 0x1p-64 */
+               if (u.bits.exp < 0x3fff - 64) {
+                       /* raise underflow if subnormal */
+                       if (u.bits.exp == 0) FORCE_EVAL(x*0x1p-120f);
+                       *sin = x;
+                       /* raise inexact if x!=0 */
+                       *cos = 1.0 + x;
+                       return;
+               }
                *sin = __sinl(x, 0, 0);
                *cos = __cosl(x, 0);
                return;