math: sin cos cleanup

[musl] / src / math / cos.c

diff --git a/src/math/cos.c b/src/math/cos.c
index 76990e7..ee97f68 100644 (file)
--- a/src/math/cos.c
+++ b/src/math/cos.c
@@ -44,26 +44,28 @@
 
 double cos(double x)
 {
-       double y[2],z=0.0;
-       int32_t n, ix;
+       double y[2];
+       uint32_t ix;
+       unsigned n;
 
        GET_HIGH_WORD(ix, x);
+       ix &= 0x7fffffff;
 
        /* |x| ~< pi/4 */
-       ix &= 0x7fffffff;
        if (ix <= 0x3fe921fb) {
-               if (ix < 0x3e46a09e)  /* if x < 2**-27 * sqrt(2) */
-                       /* raise inexact if x != 0 */
-                       if ((int)x == 0)
-                               return 1.0;
-               return __cos(x, z);
+               if (ix < 0x3e46a09e) {  /* |x| < 2**-27 * sqrt(2) */
+                       /* raise inexact if x!=0 */
+                       FORCE_EVAL(x + 0x1p120f);
+                       return 1.0;
+               }
+               return __cos(x, 0);
        }
 
        /* cos(Inf or NaN) is NaN */
        if (ix >= 0x7ff00000)
                return x-x;
 
-       /* argument reduction needed */
+       /* argument reduction */
        n = __rem_pio2(x, y);
        switch (n&3) {
        case 0: return  __cos(y[0], y[1]);