1 files changed, 48 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/builtins/fixxfdi.c b/contrib/compiler-rt/lib/builtins/fixxfdi.c
new file mode 100644
index 000000000000..011787f9e4b4
--- /dev/null
+++ b/contrib/compiler-rt/lib/builtins/fixxfdi.c
@@ -0,0 +1,48 @@
+/* ===-- fixxfdi.c - Implement __fixxfdi -----------------------------------===
+ *
+ *      	       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 __fixxfdi for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+
+/* Returns: convert a to a signed long long, rounding toward zero. */
+
+/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
+ *             di_int is a 64 bit integral type
+ *             value in long double is representable in di_int (no range checking performed)
+ */
+
+/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
+ * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
+ */
+
+COMPILER_RT_ABI di_int
+__fixxfdi(long double a)
+{
+    const di_int di_max = (di_int)((~(du_int)0) / 2);
+    const di_int di_min = -di_max - 1;
+    long_double_bits fb;
+    fb.f = a;
+    int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
+    if (e < 0)
+        return 0;
+    if ((unsigned)e >= sizeof(di_int) * CHAR_BIT)
+        return a > 0 ? di_max : di_min;
+    di_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15);
+    di_int r = fb.u.low.all;
+    r = (du_int)r >> (63 - e);
+    return (r ^ s) - s;
+}
+
+#endif /* !_ARCH_PPC */