1 files changed, 43 insertions, 0 deletions
diff --git a/lib/floatdixf.c b/lib/floatdixf.c
new file mode 100644
index 000000000..8d6911ec0
--- /dev/null
+++ b/lib/floatdixf.c
@@ -0,0 +1,43 @@
+//===-- floatdixf.c - Implement __floatdixf -------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __floatdixf for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+
+// Returns: convert a to a long double, rounding toward even.
+
+// Assumption: long double is a IEEE 80 bit floating point type padded to 128 bits
+//             di_int is a 64 bit integral type
+
+// 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
+
+long double
+__floatdixf(di_int a)
+{
+    if (a == 0)
+        return 0.0;
+    const unsigned N = sizeof(di_int) * CHAR_BIT;
+    const di_int s = a >> (N-1);
+    a = (a ^ s) - s;
+    int clz = __builtin_clzll(a);
+    int e = (N - 1) - clz ;    // exponent
+    long_double_bits fb;
+    fb.u.high.low = ((su_int)s & 0x00008000) |  // sign
+                    (e + 16383);                // exponent
+    fb.u.low.all = a << clz;                    // mantissa
+    return fb.f;
+}
+
+#endif