rework langinfo code for ABI compat and for use by time code

[musl] / src / math / sincos.c

diff --git a/src/math/sincos.c b/src/math/sincos.c
index 442e285..49f8a09 100644 (file)
--- a/src/math/sincos.c
+++ b/src/math/sincos.c
@@ -15,7 +15,8 @@
 void sincos(double x, double *sin, double *cos)
 {
        double y[2], s, c;
-       uint32_t n, ix;
+       uint32_t ix;
+       unsigned n;
 
        GET_HIGH_WORD(ix, x);
        ix &= 0x7fffffff;
@@ -24,11 +25,10 @@ void sincos(double x, double *sin, double *cos)
        if (ix <= 0x3fe921fb) {
                /* if |x| < 2**-27 * sqrt(2) */
                if (ix < 0x3e46a09e) {
-                       /* raise inexact if x != 0 */
-                       if ((int)x == 0) {
-                               *sin = x;
-                               *cos = 1.0;
-                       }
+                       /* raise inexact if x!=0 and underflow if subnormal */
+                       FORCE_EVAL(ix < 0x00100000 ? x/0x1p120f : x+0x1p120f);
+                       *sin = x;
+                       *cos = 1.0;
                        return;
                }
                *sin = __sin(x, 0.0, 0);