Initial import

third_party/compiler_rt/powixf2.c

@@ -0,0 +1,41 @@
+/* clang-format off */
+/* ===-- powixf2.cpp - Implement __powixf2 ---------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __powixf2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+STATIC_YOINK("huge_compiler_rt_license");
+
+#if !_ARCH_PPC
+
+#include "third_party/compiler_rt/int_lib.h"
+
+/* Returns: a ^ b */
+
+COMPILER_RT_ABI long double
+__powixf2(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