fix double-processing of DT_RELR relocations in ldso relocating itself

[musl] / src / math / acosl.c

diff --git a/src/math/acosl.c b/src/math/acosl.c
index 9e7b7fb..c03bdf0 100644 (file)
--- a/src/math/acosl.c
+++ b/src/math/acosl.c
@@ -23,46 +23,45 @@ long double acosl(long double x)
 }
 #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
 #include "__invtrigl.h"
+#if LDBL_MANT_DIG == 64
+#define CLEARBOTTOM(u) (u.i.m &= -1ULL << 32)
+#elif LDBL_MANT_DIG == 113
+#define CLEARBOTTOM(u) (u.i.lo = 0)
+#endif
 
 long double acosl(long double x)
 {
-       union IEEEl2bits u;
-       long double z, w, s, c, df;
-       int16_t expsign, expt;
-       u.e = x;
-       expsign = u.xbits.expsign;
-       expt = expsign & 0x7fff;
+       union ldshape u = {x};
+       long double z, s, c, f;
+       uint16_t e = u.i.se & 0x7fff;
+
        /* |x| >= 1 or nan */
-       if (expt >= 0x3fff) {
-               if (expt == 0x3fff &&
-                       ((u.bits.manh & ~LDBL_NBIT) | u.bits.manl) == 0) {
-                       if (expsign > 0)
-                               return 0;  /* acos(1) = 0 */
-                       return 2*pio2_hi + 0x1p-120f;  /* acos(-1)= pi */
-               }
-               return 0/(x-x);  /* acos(|x|>1) is NaN */
+       if (e >= 0x3fff) {
+               if (x == 1)
+                       return 0;
+               if (x == -1)
+                       return 2*pio2_hi + 0x1p-120f;
+               return 0/(x-x);
        }
        /* |x| < 0.5 */
-       if (expt < 0x3fff - 1) {
-               if (expt < 0x3fff - 65)
-                       return pio2_hi + 0x1p-120f;  /* x < 0x1p-65: acosl(x)=pi/2 */
-               return pio2_hi - (x - (pio2_lo - x * __invtrigl_R(x*x)));
+       if (e < 0x3fff - 1) {
+               if (e < 0x3fff - LDBL_MANT_DIG - 1)
+                       return pio2_hi + 0x1p-120f;
+               return pio2_hi - (__invtrigl_R(x*x)*x - pio2_lo + x);
        }
        /* x < -0.5 */
-       if (expsign < 0) {
-               z = (1.0 + x) * 0.5;
+       if (u.i.se >> 15) {
+               z = (1 + x)*0.5;
                s = sqrtl(z);
-               w = __invtrigl_R(z) * s - pio2_lo;
-               return 2*(pio2_hi - (s + w));
+               return 2*(pio2_hi - (__invtrigl_R(z)*s - pio2_lo + s));
        }
        /* x > 0.5 */
-       z = (1.0 - x) * 0.5;
+       z = (1 - x)*0.5;
        s = sqrtl(z);
-       u.e = s;
-       u.bits.manl = 0;
-       df = u.e;
-       c = (z - df * df) / (s + df);
-       w = __invtrigl_R(z) * s + c;
-       return 2*(df + w);
+       u.f = s;
+       CLEARBOTTOM(u);
+       f = u.f;
+       c = (z - f*f)/(s + f);
+       return 2*(__invtrigl_R(z)*s + c + f);
 }
 #endif