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-rw-r--r--src/math/__tanl.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/math/__tanl.c b/src/math/__tanl.c
index e39e9df4..50ba2140 100644
--- a/src/math/__tanl.c
+++ b/src/math/__tanl.c
@@ -51,8 +51,7 @@ long double __tanl(long double x, long double y, int iy) {
int i;
iy = iy == 1 ? -1 : 1; /* XXX recover original interface */
- // FIXME: this is wrong, use copysign, signbit or union bithack
- osign = x >= 0 ? 1.0 : -1.0; /* XXX slow, probably wrong for -0 */
+ osign = copysignl(1.0, x);
if (fabsl(x) >= 0.67434) {
if (x < 0) {
x = -x;