1 files changed, 4 insertions, 7 deletions
diff --git a/src/math/copysign.c b/src/math/copysign.c
index 038b8b4c..b09331b6 100644
--- a/src/math/copysign.c
+++ b/src/math/copysign.c
@@ -1,11 +1,8 @@
 #include "libm.h"
 
 double copysign(double x, double y) {
-	union dshape ux, uy;
-
-	ux.value = x;
-	uy.value = y;
-	ux.bits &= (uint64_t)-1>>1;
-	ux.bits |= uy.bits & (uint64_t)1<<63;
-	return ux.value;
+	union {double f; uint64_t i;} ux={x}, uy={y};
+	ux.i &= -1ULL/2;
+	ux.i |= uy.i & 1ULL<<63;
+	return ux.f;
 }