math: sin cos cleanup

[musl] / src / math / tanl.c

diff --git a/src/math/tanl.c b/src/math/tanl.c
index 3b51e01..546c7a0 100644 (file)
--- a/src/math/tanl.c
+++ b/src/math/tanl.c
@@ -53,11 +53,12 @@ long double tanl(long double x)
 
        /* |x| < (double)pi/4 */
        if (z.e < M_PI_4) {
-               /* x = +-0 or x is subnormal */
-               if (z.bits.exp == 0)
-                       /* inexact and underflow if x!=0 */
-                       return x + x*0x1p-120f;
-               /* can raise spurious underflow */
+               /* |x| < 0x1p-64 */
+               if (z.bits.exp < 0x3fff - 64) {
+                       /* raise inexact if x!=0 and underflow if subnormal */
+                       FORCE_EVAL(z.bits.exp == 0 ? x/0x1p120f : x+0x1p120f);
+                       return x;
+               }
                return __tanl(x, 0, 0);
        }