arm: add single instruction fma

[musl] / src / math / asin.c

diff --git a/src/math/asin.c b/src/math/asin.c
index 3e8f99e..c926b18 100644 (file)
--- a/src/math/asin.c
+++ b/src/math/asin.c
@@ -82,11 +82,9 @@ double asin(double x)
        }
        /* |x| < 0.5 */
        if (ix < 0x3fe00000) {
-               if (ix < 0x3e500000) {
-                       /* |x|<0x1p-26, return x with inexact if x!=0*/
-                       FORCE_EVAL(x + 0x1p120f);
+               /* if 0x1p-1022 <= |x| < 0x1p-26, avoid raising underflow */
+               if (ix < 0x3e500000 && ix >= 0x00100000)
                        return x;
-               }
                return x + x*R(x*x);
        }
        /* 1 > |x| >= 0.5 */