rework ldso handling of global symbol table for consistency

[musl] / src / math / exp.c

diff --git a/src/math/exp.c b/src/math/exp.c
index 5c0edee..9ea672f 100644 (file)
--- a/src/math/exp.c
+++ b/src/math/exp.c
@@ -80,7 +80,7 @@ P5   =  4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */
 
 double exp(double x)
 {
-       double hi, lo, c, z;
+       double_t hi, lo, c, xx, y;
        int k, sign;
        uint32_t hx;
 
@@ -89,30 +89,31 @@ double exp(double x)
        hx &= 0x7fffffff;  /* high word of |x| */
 
        /* special cases */
-       if (hx >= 0x40862e42) {  /* if |x| >= 709.78... */
+       if (hx >= 0x4086232b) {  /* if |x| >= 708.39... */
                if (isnan(x))
                        return x;
                if (x > 709.782712893383973096) {
                        /* overflow if x!=inf */
-                       STRICT_ASSIGN(double, x, 0x1p1023 * x);
+                       x *= 0x1p1023;
                        return x;
                }
-               if (x < -745.13321910194110842) {
+               if (x < -708.39641853226410622) {
                        /* underflow if x!=-inf */
-                       STRICT_ASSIGN(double, x, 0x1p-1000 / -x * 0x1p-1000);
-                       return x;
+                       FORCE_EVAL((float)(-0x1p-149/x));
+                       if (x < -745.13321910194110842)
+                               return 0;
                }
        }
 
        /* argument reduction */
        if (hx > 0x3fd62e42) {  /* if |x| > 0.5 ln2 */
-               if (hx < 0x3ff0a2b2)  /* if |x| < 1.5 ln2 */
-                       k = 1 - sign - sign; /* optimization */
-               else
+               if (hx >= 0x3ff0a2b2)  /* if |x| >= 1.5 ln2 */
                        k = (int)(invln2*x + half[sign]);
+               else
+                       k = 1 - sign - sign;
                hi = x - k*ln2hi;  /* k*ln2hi is exact here */
                lo = k*ln2lo;
-               STRICT_ASSIGN(double, x, hi - lo);
+               x = hi - lo;
        } else if (hx > 0x3e300000)  {  /* if |x| > 2**-28 */
                k = 0;
                hi = x;
@@ -124,10 +125,10 @@ double exp(double x)
        }
 
        /* x is now in primary range */
-       z = x*x;
-       c = x - z*(P1+z*(P2+z*(P3+z*(P4+z*P5))));
-       x = 1 + ((x*c/(2-c) - lo) + hi);
+       xx = x*x;
+       c = x - xx*(P1+xx*(P2+xx*(P3+xx*(P4+xx*P5))));
+       y = 1 + (x*c/(2-c) - lo + hi);
        if (k == 0)
-               return x;
-       return scalbn(x, k);
+               return y;
+       return scalbn(y, k);
 }