1 files changed, 40 insertions, 0 deletions
diff --git a/lib/fixunssfdi.c b/lib/fixunssfdi.c
new file mode 100644
index 000000000..6495c68e7
--- /dev/null
+++ b/lib/fixunssfdi.c
@@ -0,0 +1,40 @@
+//===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __fixunssfdi for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: convert a to a unsigned long long, rounding toward zero.
+//          Negative values all become zero.
+
+// Assumption: float is a IEEE 32 bit floating point type 
+//             du_int is a 64 bit integral type
+//             value in float is representable in du_int or is negative 
+//                 (no range checking performed)
+
+// seee eeee emmm mmmm mmmm mmmm mmmm mmmm
+
+du_int
+__fixunssfdi(float a)
+{
+    float_bits fb;
+    fb.f = a;
+    int e = ((fb.u & 0x7F800000) >> 23) - 127;
+    if (e < 0 || (fb.u & 0x80000000))
+        return 0;
+    du_int r = (fb.u & 0x007FFFFF) | 0x00800000;
+    if (e > 23)
+        r <<= (e - 23);
+    else
+        r >>= (23 - e);
+    return r;
+}