drop use of pthread_once for aio thread stack size init

[musl] / src / math / __expo2.c

diff --git a/src/math/__expo2.c b/src/math/__expo2.c
index 740ac68..248f052 100644 (file)
--- a/src/math/__expo2.c
+++ b/src/math/__expo2.c
@@ -5,12 +5,13 @@ static const int k = 2043;
 static const double kln2 = 0x1.62066151add8bp+10;
 
 /* exp(x)/2 for x >= log(DBL_MAX), slightly better than 0.5*exp(x/2)*exp(x/2) */
-double __expo2(double x)
+double __expo2(double x, double sign)
 {
        double scale;
 
        /* note that k is odd and scale*scale overflows */
        INSERT_WORDS(scale, (uint32_t)(0x3ff + k/2) << 20, 0);
        /* exp(x - k ln2) * 2**(k-1) */
-       return exp(x - kln2) * scale * scale;
+       /* in directed rounding correct sign before rounding or overflow is important */
+       return exp(x - kln2) * (sign * scale) * scale;
 }