Import libcompiler_rt into HEAD and add Makefiles.

Obtained from:	user/ed/compiler-rt

1 files changed, 38 insertions, 0 deletions

diff --git a/contrib/compiler-rt/lib/powitf2.c b/contrib/compiler-rt/lib/powitf2.c
new file mode 100644
index 0000000..3dacbf6
--- /dev/null
+++ b/contrib/compiler-rt/lib/powitf2.c
@@ -0,0 +1,38 @@
+/* ===-- powitf2.cpp - Implement __powitf2 ---------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __powitf2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#if _ARCH_PPC
+
+#include "int_lib.h"
+
+/* Returns: a ^ b */
+
+long double
+__powitf2(long double a, si_int b)
+{
+    const int recip = b < 0;
+    long double r = 1;
+    while (1)
+    {
+        if (b & 1)
+            r *= a;
+        b /= 2;
+        if (b == 0)
+            break;
+        a *= a;
+    }
+    return recip ? 1/r : r;
+}
+
+#endif