1 files changed, 34 insertions, 0 deletions

diff --git a/lib/libF77/pow_di.c b/lib/libF77/pow_di.c
new file mode 100644
index 000000000000..7af69a71259b
--- /dev/null
+++ b/lib/libF77/pow_di.c
@@ -0,0 +1,34 @@
+#include "f2c.h"
+
+#ifdef KR_headers
+double pow_di(ap, bp) doublereal *ap; integer *bp;
+#else
+double pow_di(doublereal *ap, integer *bp)
+#endif
+{
+double pow, x;
+integer n;
+
+pow = 1;
+x = *ap;
+n = *bp;
+
+if(n != 0)
+	{
+	if(n < 0)
+		{
+		n = -n;
+		x = 1/x;
+		}
+	for( ; ; )
+		{
+		if(n & 01)
+			pow *= x;
+		if(n >>= 1)
+			x *= x;
+		else
+			break;
+		}
+	}
+return(pow);
+}