1 files changed, 40 insertions, 0 deletions
diff --git a/lib/fixunsxfsi.c b/lib/fixunsxfsi.c
new file mode 100644
index 000000000..2c186a689
--- /dev/null
+++ b/lib/fixunsxfsi.c
@@ -0,0 +1,40 @@
+//===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __fixunsxfsi for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+
+// Returns: convert a to a unsigned int, rounding toward zero.
+//          Negative values all become zero.
+
+// Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
+//             su_int is a 32 bit integral type
+//             value in long double is representable in su_int or is negative 
+//                 (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
+
+su_int
+__fixunsxfsi(long double a)
+{
+    long_double_bits fb;
+    fb.f = a;
+    int e = (fb.u.high.low & 0x00007FFF) - 16383;
+    if (e < 0 || (fb.u.high.low & 0x00008000))
+        return 0;
+    return fb.u.low.high >> (31 - e);
+}
+
+#endif