1 files changed, 11 insertions, 0 deletions
diff --git a/src/math/copysignf.c b/src/math/copysignf.c
new file mode 100644
index 00000000..47ab37e4
--- /dev/null
+++ b/src/math/copysignf.c
@@ -0,0 +1,11 @@
+#include "libm.h"
+
+float copysignf(float x, float y) {
+	union fshape ux, uy;
+
+	ux.value = x;
+	uy.value = y;
+	ux.bits &= (uint32_t)-1>>1;
+	ux.bits |= uy.bits & (uint32_t)1<<31;
+	return ux.value;
+}