1 files changed, 74 insertions, 0 deletions
diff --git a/lib/muldc3.c b/lib/muldc3.c
new file mode 100644
index 000000000000..c048d84faa1f
--- /dev/null
+++ b/lib/muldc3.c
@@ -0,0 +1,74 @@
+/* ===-- muldc3.c - Implement __muldc3 -------------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __muldc3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+#include <math.h>
+#include <complex.h>
+
+/* Returns: the product of a + ib and c + id */
+
+double _Complex
+__muldc3(double __a, double __b, double __c, double __d)
+{
+    double __ac = __a * __c;
+    double __bd = __b * __d;
+    double __ad = __a * __d;
+    double __bc = __b * __c;
+    double _Complex z;
+    __real__ z = __ac - __bd;
+    __imag__ z = __ad + __bc;
+    if (isnan(__real__ z) && isnan(__imag__ z))
+    {
+        int __recalc = 0;
+        if (isinf(__a) || isinf(__b))
+        {
+            __a = copysign(isinf(__a) ? 1 : 0, __a);
+            __b = copysign(isinf(__b) ? 1 : 0, __b);
+            if (isnan(__c))
+                __c = copysign(0, __c);
+            if (isnan(__d))
+                __d = copysign(0, __d);
+            __recalc = 1;
+        }
+        if (isinf(__c) || isinf(__d))
+        {
+            __c = copysign(isinf(__c) ? 1 : 0, __c);
+            __d = copysign(isinf(__d) ? 1 : 0, __d);
+            if (isnan(__a))
+                __a = copysign(0, __a);
+            if (isnan(__b))
+                __b = copysign(0, __b);
+            __recalc = 1;
+        }
+        if (!__recalc && (isinf(__ac) || isinf(__bd) ||
+                          isinf(__ad) || isinf(__bc)))
+        {
+            if (isnan(__a))
+                __a = copysign(0, __a);
+            if (isnan(__b))
+                __b = copysign(0, __b);
+            if (isnan(__c))
+                __c = copysign(0, __c);
+            if (isnan(__d))
+                __d = copysign(0, __d);
+            __recalc = 1;
+        }
+        if (__recalc)
+        {
+            __real__ z = INFINITY * (__a * __c - __b * __d);
+            __imag__ z = INFINITY * (__a * __d + __b * __c);
+        }
+    }
+    return z;
+}