Check for and use copysignf

1 files changed, 13 insertions, 0 deletions

diff --git a/common/math_defs.h b/common/math_defs.h
index 04d73f42..99cc62ec 100644
--- a/common/math_defs.h
+++ b/common/math_defs.h
@@ -40,6 +40,19 @@ static inline float cbrtf(float f)
 }
 #endif
 
+#ifndef HAVE_COPYSIGNF
+static inline float copysignf(float x, float y)
+{
+    union {
+        float f;
+        unsigned int u;
+    } ux = { x }, uy = { y };
+    ux.u &= 0x7fffffffu;
+    ux.u |= (uy.u&0x80000000u);
+    return ux.f;
+}
+#endif
+
 #define DEG2RAD(x)  ((float)(x) * (float)(M_PI/180.0))
 #define RAD2DEG(x)  ((float)(x) * (float)(180.0/M_PI))