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 21e6c95..c03bdf0 100644 (file)
--- a/src/math/acosl.c
+++ b/src/math/acosl.c
@@ -23,69 +23,45 @@ long double acosl(long double x)
 }
 #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
 #include "__invtrigl.h"
-
-static const long double
-one = 1.00000000000000000000e+00;
-
-// FIXME
-//#ifdef __i386__
-/* XXX Work around the fact that gcc truncates long double constants on i386 */
-static volatile double
-pi1 = 3.14159265358979311600e+00, /* 0x1.921fb54442d18p+1 */
-pi2 = 1.22514845490862001043e-16; /* 0x1.1a80000000000p-53 */
-#define pi ((long double)pi1 + pi2)
-//#else
-#if 0
-static const long double
-pi = 3.14159265358979323846264338327950280e+00L;
+#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, p, q, r, w, s, c, df;
-       int16_t expsign, expt;
-       u.e = x;
-       expsign = u.xbits.expsign;
-       expt = expsign & 0x7fff;
-       if (expt >= BIAS) {        /* |x| >= 1 */
-               if (expt == BIAS &&
-                       ((u.bits.manh & ~LDBL_NBIT) | u.bits.manl) == 0) {
-                       if (expsign > 0)
-                               return 0.0;  /* acos(1) = 0 */
-                       else
-                               return pi + 2.0 * pio2_lo;  /* acos(-1)= pi */
-               }
-               return (x - x) / (x - x);  /* acos(|x|>1) is NaN */
+       union ldshape u = {x};
+       long double z, s, c, f;
+       uint16_t e = u.i.se & 0x7fff;
+
+       /* |x| >= 1 or nan */
+       if (e >= 0x3fff) {
+               if (x == 1)
+                       return 0;
+               if (x == -1)
+                       return 2*pio2_hi + 0x1p-120f;
+               return 0/(x-x);
        }
-       if (expt < BIAS - 1) {     /* |x| < 0.5 */
-               if (expt < ACOS_CONST)
-                       return pio2_hi + pio2_lo;  /* x tiny: acosl=pi/2 */
-               z = x * x;
-               p = P(z);
-               q = Q(z);
-               r = p / q;
-               return pio2_hi - (x - (pio2_lo - x * r));
-       } else if (expsign < 0) {  /* x < -0.5 */
-               z = (one + x) * 0.5;
-               p = P(z);
-               q = Q(z);
-               s = sqrtl(z);
-               r = p / q;
-               w = r * s - pio2_lo;
-               return pi - 2.0 * (s + w);
-       } else {                   /* x > 0.5 */
-               z = (one - x) * 0.5;
+       /* |x| < 0.5 */
+       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 (u.i.se >> 15) {
+               z = (1 + x)*0.5;
                s = sqrtl(z);
-               u.e = s;
-               u.bits.manl = 0;
-               df = u.e;
-               c = (z - df * df) / (s + df);
-               p = P(z);
-               q = Q(z);
-               r = p / q;
-               w = r * s + c;
-               return 2.0 * (df + w);
+               return 2*(pio2_hi - (__invtrigl_R(z)*s - pio2_lo + s));
        }
+       /* x > 0.5 */
+       z = (1 - x)*0.5;
+       s = sqrtl(z);
+       u.f = s;
+       CLEARBOTTOM(u);
+       f = u.f;
+       c = (z - f*f)/(s + f);
+       return 2*(__invtrigl_R(z)*s + c + f);
 }
 #endif