math: sin cos cleanup

[musl] / src / math / cosl.c

diff --git a/src/math/cosl.c b/src/math/cosl.c
index 25d9005..0794d28 100644 (file)
--- a/src/math/cosl.c
+++ b/src/math/cosl.c
@@ -39,30 +39,30 @@ long double cosl(long double x) {
 long double cosl(long double x)
 {
        union IEEEl2bits z;
-       int e0;
+       unsigned n;
        long double y[2];
        long double hi, lo;
 
        z.e = x;
        z.bits.sign = 0;
 
-       /* If x = +-0 or x is a subnormal number, then cos(x) = 1 */
-       if (z.bits.exp == 0)
-               return 1.0;
-
        /* If x = NaN or Inf, then cos(x) = NaN. */
-       if (z.bits.exp == 32767)
+       if (z.bits.exp == 0x7fff)
                return (x - x) / (x - x);
 
-       /* Optimize the case where x is already within range. */
-       if (z.e < M_PI_4)
+       /* |x| < (double)pi/4 */
+       if (z.e < M_PI_4) {
+               /* |x| < 0x1p-64 */
+               if (z.bits.exp < 0x3fff - 64)
+                       /* raise inexact if x!=0 */
+                       return 1.0 + x;
                return __cosl(z.e, 0);
+       }
 
-       e0 = __rem_pio2l(x, y);
+       n = __rem_pio2l(x, y);
        hi = y[0];
        lo = y[1];
-
-       switch (e0 & 3) {
+       switch (n & 3) {
        case 0:
                hi = __cosl(hi, lo);
                break;